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NSR database version of April 11, 2024.

Search: Author = J.D.Holt

Found 99 matches.

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2024HE01      Phys.Rev. C 109, 014327 (2024)

J.Heery, J.Henderson, C.R.Hoffman, A.M.Hill, T.Beck, C.Cousins, P.Farris, A.Gade, S.A.Gillespie, J.D.Holt, B.Hu, H.Iwasaki, S.Kisyov, A.N.Kuchera, B.Longfellow, C.Muller-Gatermann, A.Poves, E.Rubino, R.Russell, R.Salinas, A.Sanchez, D.Weisshaar, C.Y.Wu, J.Wu

Suppressed electric quadrupole collectivity in 32Si

doi: 10.1103/PhysRevC.109.014327
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2024LI18      Phys.Rev. C 109, 034312 (2024)

B.D.Linh, A.Corsi, A.Gillibert, A.Obertelli, P.Doornenbal, C.Barbieri, T.Duguet, M.Gomez-Ramos, J.D.Holt, B.S.Hu, T.Miyagi, A.M.Moro, P.Navratil, K.Ogata, S.Peru, N.T.T.Phuc, N.Shimizu, V.Soma, Y.Utsuno, N.L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, L.X.Chung, F.Flavigny, S.Franchoo, I.Gasparic, R.B.Gerst, J.Gibelin, K.I.Hahn, N.T.Khai, D.Kim, T.Koiwai, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, D.Sohler, P.-A.Soderstrom, S.Takeuchi, H.Tornqvist, V.Vaquero, V.Wagner, S.T.Wang, V.Werner, X.Xu, Y.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Onset of collectivity for argon isotopes close to N=32

doi: 10.1103/PhysRevC.109.034312
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2023CH26      Phys.Lett. B 843, 138025 (2023)

S.Chen, F.Browne, P.Doornenbal, J.Lee, A.Obertelli, Y.Tsunoda, T.Otsuka, Y.Chazono, G.Hagen, J.D.Holt, G.R.Jansen, K.Ogata, N.Shimizu, Y.Utsuno, K.Yoshida, N.L.Achouri, H.Baba, D.Calvet, F.Chateau, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, L.X.Chung, F.Flavigny, S.Franchoo, I.Gasparic, R.-B.Gerst, J.Gibelin, K.I.Hahn, D.Kim, T.Koiwai, Y.Kondo, P.Koseoglou, C.Lehr, B.D.Linh, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, P.-A.Soderstrom, D.Sohler, S.Takeuchi, H.Tornqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Level structures of 56, 58Ca cast doubt on a doubly magic 60Ca

NUCLEAR REACTIONS 1H(57Sc, 2p)56Ca, E=209 MeV/nucleon; 1H(59Sc, 2p)58Ca, E=199 MeV/nucleon, [57,59Sc secondary beams from 9Be(70Zn, X), E=345 MeV/nucleon, followed by separation and identification of ions of interest using the BigRIPS separator at RIBF-RIKEN facility]; measured reaction residues of 56Ca and 58Ca through identification by the SAMURAI spectrometer, Doppler-corrected Eγ, Iγ, (particle)γ-coin using the DALI2+ array using MINOS liquid hydrogen target. 56,58Ca; deduced energies of the first 2+ levels. Comparison with shell-model calculations with the GXPF1B Hamiltonian in full pf model space, and the state-of-the-art ab initio approaches: VS-IMSRG method, and CC calculations. Systematics of energies of the first 2+ states and S(2n) from experiment (N=22-36) and theory in N=22-54 Ca isotopes.

doi: 10.1016/j.physletb.2023.138025
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2023GR04      Phys.Rev.Lett. 130, 242501 (2023)

T.J.Gray, J.M.Allmond, Z.Xu, T.T.King, R.S.Lubna, H.L.Crawford, V.Tripathi, B.P.Crider, R.Grzywacz, S.N.Liddick, A.O.Macchiavelli, T.Miyagi, A.Poves, A.Andalib, E.Argo, C.Benetti, S.Bhattacharya, C.M.Campbell, M.P.Carpenter, J.Chan, A.Chester, J.Christie, B.R.Clark, I.Cox, A.A.Doetsch, J.Dopfer, J.G.Duarte, P.Fallon, A.Frotscher, T.Gaballah, J.T.Harke, J.Heideman, H.Huegen, J.D.Holt, R.Jain, N.Kitamura, K.Kolos, F.G.Kondev, A.Laminack, B.Longfellow, S.Luitel, M.Madurga, R.Mahajan, M.J.Mogannam, C.Morse, S.Neupane, A.Nowicki, T.H.Ogunbeku, W.-J.Ong, C.Porzio, C.J.Prokop, B.C.Rasco, E.K.Ronning, E.Rubino, T.J.Ruland, K.P.Rykaczewski, L.Schaedig, D.Seweryniak, K.Siegl, M.Singh, A.E.Stuchbery, S.L.Tabor, T.L.Tang, T.Wheeler, J.A.Winger, J.L.Wood

Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB

RADIOACTIVITY 32Na(IT), (β-) [from 9Be(48Ca, X), E=172.3 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced γ-ray energies, partial level scheme, isomeric T1/2, B(E2), single-particle occupancies. Comparison with calculations. The Advanced Rare Isotope Separator (ARIS), the FRIB Decay Station initiator (FDSi).

doi: 10.1103/PhysRevLett.130.242501
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2023JO01      Phys.Rev. C 107, 014327 (2023)

L.Jokiniemi, T.Miyagi, S.R.Stroberg, J.D.Holt, J.Kotila, J.Suhonen

Ab initio calculation of muon capture on 24Mg

NUCLEAR REACTIONS 24Mg(μ-, ν), E at rest; calculated nuclear matrix elements, capture rates to the lowest levels of 24Na. Valence-space in-medium similarity renormalization group (VS-IMSRG) and nuclear shell model calculations. Comparison to experimental data.

NUCLEAR STRUCTURE 24Mg, 24Na; calculated levels, J, π, B(E2), B(M1), magnetic dipole moments. 24Mg; calculated electric quadrupole moments.

RADIOACTIVITY 24Na(β-); calculated log ft values for decay to excited states in 24Mg.

doi: 10.1103/PhysRevC.107.014327
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2023KO19      Phys.Rev.Lett. 131, 102501 (2023)

K.Konig, S.Fritzsche, G.Hagen, J.D.Holt, A.Klose, J.Lantis, Y.Liu, K.Minamisono, T.Miyagi, W.Nazarewicz, T.Papenbrock, S.V.Pineda, R.Powel, P.-G.Reinhard

Surprising Charge-Radius Kink in the Sc Isotopes at N=20

NUCLEAR REACTIONS Be(40Ca, X)40Sc/41Sc, E=140 MeV/nucleon; measured frequencies; deduced resonance spectra, charge radii using collinear laser spectroscopy, kink at neutron shell closure. Comparison with available data. The National Superconducting Cyclotron Laboratory.

doi: 10.1103/PhysRevLett.131.102501
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2023LE15      Phys.Lett. B 847, 138278 (2023)

S.Lechner, T.Miyagi, Z.Y.Xu, M.L.Bissell, K.Blaum, B.Cheal, C.S.Devlin, R.F.Garcia Ruiz, J.S.M.Ginges, H.Heylen, J.D.Holt, P.Imgram, A.Kanellakopoulos, A.Koszorus, S.Malbrunot-Ettenauer, R.Neugart, G.Neyens, W.Nortershauser, P.Plattner, L.V.Rodriguez, G.Sanamyan, S.R.Stroberg, Y.Utsuno, X.F.Yang, D.T.Yordanov

Electromagnetic moments of the antimony isotopes 112-133Sb

NUCLEAR MOMENTS 113,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133Sb; measured frequencies; deduced hyperfine spectra parameters, hyperfine anomaly, nuclear magnetic dipole and electric quadrupole moments. Comparison with shell model and ab initio calculations. Radioactive antimony (Sb) isotopes were produced at the radioactive ion beam facility ISOLDE-CERN.

doi: 10.1016/j.physletb.2023.138278
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2023NI07      Phys.Rev.Lett. 131, 022502 (2023)

L.Nies, D.Atanasov, M.Athanasakis-Kaklamanakis, M.Au, K.Blaum, J.Dobaczewski, B.S.Hu, J.D.Holt, J.Karthein, I.Kulikov, Y.A.Litvinov, D.Lunney, V.Manea, T.Miyagi, M.Mougeot, L.Schweikhard, A.Schwenk, K.Sieja, F.Wienholtz

Isomeric Excitation Energy for 99Inm from Mass Spectrometry Reveals Constant Trend Next to Doubly Magic 100Sn

ATOMIC MASSES 99,100,101In; measured TOF; deduced mass excess, excitation energies. The ISOLTRAP mass spectrometer at ISOLDE/CERN.

RADIOACTIVITY 99In(IT); measured decay products; deduced excitation energy with small uncertainty, intriguing constancy of the isomer excitation energies in neutron-deficient indium that persists down to the N=50 shell closure, even when all neutrons are removed from the valence shell. Comparison with large-scale shell model, ab initio, and density functional theory calculations.

doi: 10.1103/PhysRevLett.131.022502
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2022BA15      Phys.Lett. B 829, 137064 (2022)

S.W.Bai, A.Koszorus, B.S.Hu, X.F.Yang, J.Billowes, C.L.Binnersley, M.L.Bissell, K.Blaum, P.Campbell, B.Cheal, T.E.Cocolios, R.P.de Groote, C.S.Devlin, K.T.Flanagan, R.F.Garcia Ruiz, H.Heylen, J.D.Holt, A.Kanellakopoulos, J.Kramer, V.Lagaki, B.Maass, S.Malbrunot-Ettenauer, T.Miyagi, R.Neugart, G.Neyens, W.Nortershauser, L.V.Rodriguez, F.Sommer, A.R.Vernon, S.J.Wang, X.B.Wang, S.G.Wilkins, Z.Y.Xu, C.X.Yuan

Electromagnetic moments of scandium isotopes and N=28 isotones in the distinctive 0f7/2 orbit

NUCLEAR MOMENTS 41,43,45,46,47,49Sc; measured frequencies; deduced hfs constants, electromagnetic dipole and quadrupole moments. Comparison with theoretical calculations. Two collinear laser spectroscopy (CLS) setups, COLLAPS and CRIS at ISOLDE-CERN.

doi: 10.1016/j.physletb.2022.137064
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2022CR04      Phys.Rev. C 106, L061303 (2022)

H.L.Crawford, M.D.Jones, A.O.Macchiavelli, P.Fallon, D.Bazin, P.C.Bender, B.A.Brown, C.M.Campbell, R.M.Clark, M.Cromaz, B.Elman, A.Gade, J.D.Holt, R.V.F.Janssens, I.Y.Lee, B.Longfellow, S.Paschalis, M.Petri, A.L.Richard, M.Salathe, J.A.Tostevin, D.Weisshaar

Core of 25F studied by the 25F(-p) proton-removal reaction

NUCLEAR REACTIONS 9Be(25F, 24O), E=77 MeV/nucleon; measured reaction products; deduced longitudinal momentum distribution, proton removal σ, spectroscopic factor. Results are interpreted within the framework of the Particle-Vibration Coupling (PVC) model, of a d5/2 proton coupled to a quadrupole phonon of an effective 24O core. Comparison to shell model predictions. Reaction products analyzed by spectrometer S800 (NSCL). Secondary 25F beam from 48Ca fragmentation on Be target at accelerated through the Coupled Cyclotron Facility.

doi: 10.1103/PhysRevC.106.L061303
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2022HE06      Phys.Rev. C 105, 034332 (2022)

J.Henderson, G.Hackman, P.Ruotsalainen, J.D.Holt, S.R.Stroberg, C.Andreoiu, G.C.Ball, N.Bernier, M.Bowry, R.Caballero-Folch, S.Cruz, A.Diaz Varela, L.J.Evitts, R.Frederick, A.B.Garnsworthy, M.Holl, J.Lassen, J.Measures, B.Olaizola, E.O'Sullivan, O.Paetkau, J.Park, J.Smallcombe, C.E.Svensson, K.Whitmore, C.Y.Wu

Coulomb excitation of the ITzI = 1 over 2, A=23 mirror pair

NUCLEAR REACTIONS Ti(23Na, 23Na), E=42.9, 39.4 MeV; Ti(23Mg, 23Mg), E=42.9 MeV; measured reaction products, Eγ, Iγ, (particle)γ. 23Na, 23Mg deduced E2 matrix elements, B(E2), spectroscopic quadrupole moments, δ. GOSIA analysis of Coulomb excitation reactions. Comparison to other experimental data and theoretical calculations (shell model with the USDB interaction and ab initio calculations using the valence-space in-medium similarity renormalization group). TIGRESS array of 14 clover-type HPGe detectors with BGO Compton suppression at TRIUMF-ISAC facility.

doi: 10.1103/PhysRevC.105.034332
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2022HU04      Phys.Rev.Lett. 128, 072502 (2022)

B.S.Hu, J.Padua-Arguelles, S.Leutheusser, T.Miyagi, S.R.Stroberg, J.D.Holt

Ab Initio Structure Factors for Spin-Dependent Dark Matter Direct Detection

doi: 10.1103/PhysRevLett.128.072502
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2022HU13      Nat.Phys. 610, 1196 (2022)

B.Hu, W.Jiang, T.Miyagi, Z.Sun, A.Ekstrom, C.Forssen, G.Hagen, J.D.Holt, T.Papenbrock, S.R.Stroberg, I.Vernon

Ab initio predictions link the neutron skin of 208Pb to nuclear forces

NUCLEAR STRUCTURE 208Pb; analyzed available data; calculated neutron skin using Ab initio, bulk properties.

doi: 10.1038/s41567-022-01715-8
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2022KA35      Phys.Rev.Lett. 129, 142502 (2022)

S.Kaur, R.Kanungo, W.Horiuchi, G.Hagen, J.D.Holt, B.S.Hu, T.Miyagi, T.Suzuki, F.Ameil, J.Atkinson, Y.Ayyad, S.Bagchi, D.Cortina-Gil, I.Dillmann, A.Estrade, A.Evdokimov, F.Farinon, H.Geissel, G.Guastalla, R.Janik, R.Knobel, J.Kurcewicz, Y.A.Litvinov, M.Marta, M.Mostazo, I.Mukha, C.Nociforo, H.J.Ong, T.Otsuka, S.Pietri, A.Prochazka, C.Scheidenberger, B.Sitar, P.Strmen, M.Takechi, J.Tanaka, I.Tanihata, S.Terashima, J.Vargas, H.Weick, J.S.Winfield

Proton Distribution Radii of 16-24O: Signatures of New Shell Closures and Neutron Skin

NUCLEAR REACTIONS 12C(16O, X), (18O, X), (19O, X), (20O, X), (21O, X), (22O, X), (23O, X), (24O, X), E<1 GeV/nucleon; measured reaction products. 16,18,20,21,22,23,24O; deduced charge changing σ, root mean square proton and matter radii, neutron skin thickness, shell closure. Comparison with with ab initio calculations employing the chiral NNLO sat interaction, shell model predictions. The fragment separator FRS at GSI.

doi: 10.1103/PhysRevLett.129.142502
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2022KO06      Phys.Lett. B 827, 136953 (2022)

T.Koiwai, K.Wimmer, P.Doornenbal, A.Obertelli, C.Barbieri, T.Duguet, J.D.Holt, T.Miyagi, P.Navratil, K.Ogata, N.Shimizu, V.Soma, Y.Utsuno, K.Yoshida, N.L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Yoneda, O.Aktas, T.Aumann, L.X.Chung, F.Flavigny, S.Franchoo, I.Gasparic, R.-B.Gerst, J.Gibelin, K.I.Hahn, D.Kim, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, B.D.Linh, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, P.-A.Soderstrom, D.Sohler, S.Takeuchi, H.Toernqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

A first glimpse at the shell structure beyond 54Ca: Spectroscopy of 55K, 55Ca, and 57Ca

NUCLEAR REACTIONS 1H(56Ca, 2p)55K, (56Ca, np)55Ca, E=250 MeV/nucleon; 1H(58Sc, 2p)57Ca, E not given, [secondary 56Ca and 58Sc beams from 9Be(70Zn, X), E=345 MeV/nucleon, followed by selection of fragments of interest using the BigRIPS separator through the TOF-ΔE-Bρ method at RIBF-RIKEN facility]; measured reaction products using the by SAMURAI magnetic spectrometer, protons, Eγ, Iγ, (proton)γ-coin using thick liquid hydrogen target system MINOS and DALI22 array of 226 NaI(Tl) scintillator detectors. 55K, 55,57Ca; deduced levels, J, π, level half-lives, exclusive population σ, spectroscopic factors, short-lived state in 57Ca. Comparison with state-of-the-art theoretical calculations using different approaches such as large-scale shell model (LSSM), valence-space in-medium similarity renormalization group (VS-IMSRG), full-space self-consistent Green's function (SCGF) with NNLOsat and NN+3N(lnl) interactions.

doi: 10.1016/j.physletb.2022.136953
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2022MA04      Phys.Rev.Lett. 128, 022502 (2022)

S.Malbrunot-Ettenauer, S.Kaufmann, S.Bacca, C.Barbieri, J.Billowes, M.L.Bissell, K.Blaum, B.Cheal, T.Duguet, R.F.Garcia Ruiz, W.Gins, C.Gorges, G.Hagen, H.Heylen, J.D.Holt, G.R.Jansen, A.Kanellakopoulos, M.Kortelainen, T.Miyagi, P.Navratil, W.Nazarewicz, R.Neugart, G.Neyens, W.Nortershauser, S.J.Novario, T.Papenbrock, T.Ratajczyk, P.-G.Reinhard, L.V.Rodriguez, R.Sanchez, S.Sailer, A.Schwenk, J.Simonis, V.Soma, S.R.Stroberg, L.Wehner, C.Wraith, L.Xie, Z.Y.Xu, X.F.Yang, D.T.Yordanov

Nuclear Charge Radii of the Nickel Isotopes 58-68, 70Ni

NUCLEAR MOMENTS 58,59,60,61,62,63,64,65,66,67,68Ni, 70Ni; measured frequency-time spectrum; deduced isotope shifts, mean-square charge radii. Comparison with ab initio approaches. Collinear laser spectroscopy beam line COLLAPS, ISOLDE/CERN.

doi: 10.1103/PhysRevLett.128.022502
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2022MI01      Phys.Rev. C 105, 014302 (2022)

T.Miyagi, S.R.Stroberg, P.Navratil, K.Hebeler, J.D.Holt

Converged ab initio calculations of heavy nuclei

NUCLEAR STRUCTURE 132Sn; calculated ground-state energy, rms point-proton and point-neutron radii, and neutron skin thickness using many-body perturbation theory (MBPT(2)), Hartree-Fock based many-body perturbation theory (HF-MBPT(3)) to second and third order, and in-medium similarity renormalization group (IMSRG(2)). 127Cd; calculated excitation spectrum computed in valence-space (VS)IMSRG(2) approximation. 126,128,130,132,134,136Sn; calculated energies of the first 2+ states using (VS)IMSRG(2) approximation, and compared with experimental data. Ab initio calculations of atomic nuclei with a proposed novel storage scheme for three-nucleon (3N) interaction matrix elements for the normal-ordered two-body (NO2B) approximation. Relevance to neutron skin of 208Pb, neutrinoless double-β decays and dark matter searches in germanium, selenium, xenon and tellurium.

doi: 10.1103/PhysRevC.105.014302
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2022PO01      Phys.Rev. C 105, 034310 (2022)

R.Powel, B.A.Brown, J.D.Holt, A.Klose, K.Konig, J.Lantis, K.Minamisono, T.Miyagi, S.Pineda

Ground state magnetic dipole moment of 40Sc

NUCLEAR MOMENTS 40,41Sc; measured hyperfine structure spectra; deduced hyperfine coupling constants, magnetic dipole moments, electric quadrupole moments. Comparison to shell-model and multishell in-medium similarity renormalization group (IMSRG) calculations. Collinear laser spectroscopy technique at NSCL-BECOLA facility. Scandium beam produced in 9Be(40Ca, X), E=140 MeV/nucleon reaction, and transported using A1900 fragment separator at NSCL-MSU. Systematics of experimental and theoretical magnetic moments of ground states of 40,41Sc, 39,41Ca, 39,40K.

doi: 10.1103/PhysRevC.105.034310
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2022PO02      Phys.Rev. C 105, L041301 (2022)

W.S.Porter, B.Ashrafkhani, J.Bergmann, C.Brown, T.Brunner, J.D.Cardona, D.Curien, I.Dedes, T.Dickel, J.Dudek, E.Dunling, G.Gwinner, Z.Hockenbery, J.D.Holt, C.Hornung, C.Izzo, A.Jacobs, A.Javaji, B.Kootte, G.Kripko-Koncz, E.M.Lykiardopoulou, T.Miyagi, I.Mukul, T.Murbock, W.R.Plass, M.P.Reiter, J.Ringuette, C.Scheidenberger, R.Silwal, C.Walls, H.L.Wang, Y.Wang, J.Yang, J.Dilling, A.A.Kwiatkowski

Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

ATOMIC MASSES 63,64,65,65m,66,67,68,69,69m,70Fe; measured time-of-flight; deduced mass excess, S(2n), pairing gap. Systematics of S(2n) values for Z=24–28 isotope chains. Compared to mean-field calculations employing recent Woods-Saxon Hamiltonian and results from the multishell valence-space in-medium similarity renormalization group (VS-IMSRG). Comparison to recommended values from AME2020. TITAN (TRIUMF’s Ion Trap for Atomic and Nuclear science) Multiple-Reflection Time-of- Flight Mass Spectrometer.

doi: 10.1103/PhysRevC.105.L041301
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2022SI20      Phys.Lett. B 833, 137288 (2022)

R.Silwal, C.Andreoiu, B.Ashrafkhani, J.Bergmann, T.Brunner, J.Cardona, K.Dietrich, E.Dunling, G.Gwinner, Z.Hockenbery, J.D.Holt, C.Izzo, A.Jacobs, A.Javaji, B.Kootte, Y.Lan, D.Lunney, E.M.Lykiardopoulou, T.Miyagi, M.Mougeot, I.Mukul, T.Murbock, W.S.Porter, M.Reiter, J.Ringuette, J.Dilling, A.A.Kwiatkowski

Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

ATOMIC MASSES 59Cr, 61,62,63,64,65Cr; measured frequencies, TOF; deduced mass excess values, pairing gap, two-neutron separation energies, intruder configurations. Comparison with theoretical calculations, AME2020 evaluation. MR-TOF-MS, part of the TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility.

doi: 10.1016/j.physletb.2022.137288
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2022SO14      Phys.Rev.Lett. 129, 132501 (2022)

F.Sommer, K.Konig, D.M.Rossi, N.Everett, D.Garand, R.P.de Groote, J.D.Holt, P.Imgram, A.Incorvati, C.Kalman, A.Klose, J.Lantis, Y.Liu, A.J.Miller, K.Minamisono, T.Miyagi, W.Nazarewicz, W.Nortershauser, S.V.Pineda, R.Powel, P.-G.Reinhard, L.Renth, E.Romero-Romero, R.Roth, A.Schwenk, C.Sumithrarachchi, A.Teigelhofer

Charge Radii of 55, 56Ni Reveal a Surprisingly Similar Behavior at N=28 in Ca and Ni Isotopes

NUCLEAR MOMENTS 54,55,56,57,58,59,60Ni; measured frequencies; deduced Isotope shifts, differential ms charge radii, and absolute rms charge radii. Comparison with nuclear density functional theory (DFT) calculations. National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU) and collinear laser spectroscopy (CLS) at the BECOLA facility.

doi: 10.1103/PhysRevLett.129.132501
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2022ST03      Phys.Rev. C 105, 034333 (2022)

S.R.Stroberg, J.Henderson, G.Hackman, P.Ruotsalainen, G.Hagen, J.D.Holt

Systematics of E2 strength in the sd shell with the valence-space in-medium similarity renormalization group

NUCLEAR STRUCTURE 18O, 18,19,21,22Ne, 19,21F, 21,23Na, 21,22,23,25,26Mg, 25,27,34Al, 26,27,29,30Si, 29,31,33P, 30,31,34S, 33,34Ar; calculated B(E2). 14C; calculated energies of first 0+ and 2+ states, neutron and proton quadrupole-excitation amplitudes. Ab initio valence-space in-medium similarity renormalization group (VS-IMSRG) and shell-model calculations with the USDB interaction. Comparison to experimental data.

doi: 10.1103/PhysRevC.105.034333
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2022TE06      Few-Body Systems 63, 67 (2022)

I.Tews, Z.Davoudi, A.Ekstrom, J.D.Holt, K.Becker, R.Briceno, D.J.Dean, W.Detmold, C.Drischler, T.Duguet, E.Epelbaum, A.Gasparyan, J.Gegelia, J.R.Green, H.W.Griesshammer, A.D.Hanlon, M.Heinz, H.Hergert, M.Hoferichter, M.Illa, D.Kekejian, A.Kievsky, S.Konig, H.Krebs, K.D.Launey, D.Lee, P.Navratil, A.Nicholson, A.Parreno, D.R.Phillips, M.Ploszajczak, X.-L.Ren, T.R.Richardson, C.Robin, G.H.Sargsyan, M.J.Savage, M.R.Schindler, P.E.Shanahan, R.P.Springer, A.Tichai, U.van Kolck, M.L.Wagman, A.Walker-Loud, C.-J.Yang, X.Zhang

Nuclear Forces for Precision Nuclear Physics: A Collection of Perspectives

doi: 10.1007/s00601-022-01749-x
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2022YA19      Phys.Rev. C 106, 014315 (2022)

J.M.Yao, I.Ginnett, A.Belley, T.Miyagi, R.Wirth, S.Bogner, J.Engel, H.Hergert, J.D.Holt, S.R.Stroberg

Ab initio studies of the double-Gamow-Teller transition and its correlation with neutrinoless double-β decay

RADIOACTIVITY 6,8He, 10Be, 14C, 18,22O, 22Ne, 26,28Mg, 30Si, 34S, 38Ar, 42,44,48,56Ca, 50Cr, 46,52Ti(2β-); A=6-76(2β-); calculated nuclear matrix elements (NMEs) for ground-state-to-ground-state double Gamow-Teller transitions (DGT) and Gamow Teller (GT) 0νββ decay, transition densities of parent nuclei, correlation between the transition densities and NMEs of DGT transitions. Ab initio many body methods by importance-truncated no-core shell model (IT-NCSM) with GXPF1A interaction, valence-space in-medium similarity renormalization group method (VSIMSRG) with EM1.8/2.0 interaction, and in-medium generator coordinate method (IM-GCM). 6He, 10Be, 14C, 18O, 22Ne, 26Mg, 30Si, 34S, 38Ar, 42,44Ca, 46Ti, 50Cr; 2β- decay mode forbidden for these nuclei due to negative Q values, however, on query, authors mentioned that these nuclei were included for NMEs for 0νββ decays as these involved the same decay operators that determine the allowed decay rates, thus helpful to benchmark many-body approaches for the nuclear matrix elements of neutrinoless double beta decay.

doi: 10.1103/PhysRevC.106.014315
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2021BE03      Phys.Rev.Lett. 126, 042502 (2021)

A.Belley, C.G.Payne, S.R.Stroberg, T.Miyagi, J.D.Holt

Ab Initio Neutrinoless Double-Beta Decay Matrix Elements for 48Ca, 76Ge, and 82Se

RADIOACTIVITY 48Ca, 76Ge, 82Se(2β-); calculated basis-space converged neutrinoless ββ-decay nuclear matrix elements for the lightest candidates using ab initio in-medium similarity renormalization group to construct valence-space Hamiltonians and consistently transformed ββ-decay operators.

doi: 10.1103/PhysRevLett.126.042502
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2021BO21      Phys.Rev. C 104, 024314 (2021)

M.Bowry, C.E.Jones, A.B.Garnsworthy, G.C.Ball, S.Cruz, S.Georges, G.Hackman, J.D.Holt, J.Measures, B.Olaizola, H.P.Patel, C.J.Pearson, C.E.Svensson

Decay spectroscopy of 50Sc and 50mSc to 50Ti

RADIOACTIVITY 50,50mSc(β-)[from 40Ca β- decay produced in Ta(p, X), E=500 MeV at TRIUMF-ISAC facility]; measured Eγ, Iγ, Eβ, γγ- and βγ-coin using GRIFFIN array of 15 HPGe clover detectors for γ detection, and SCEPTAR array of plastic scintillators for β detection. 50Ti; deduced levels, J, π, β- feedings, logft, B(GT). Comparison with shell model using KB3G and GXPF1A interactions, and ab-initio VS-IMSRG calculations for energy levels, B(E2) and nuclear quadrupole moments. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.104.024314
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2021HE04      Phys.Rev. C 103, 014318 (2021)

H.Heylen, C.S.Devlin, W.Gins, M.L.Bissell, K.Blaum, B.Cheal, L.Filippin, R.F.Garcia Ruiz, M.Godefroid, C.Gorges, J.D.Holt, A.Kanellakopoulos, S.Kaufmann, A.Koszorus, K.Konig, S.Malbrunot-Ettenauer, T.Miyagi, R.Neugart, G.Neyens, W.Nortershauser, R.Sanchez, F.Sommer, L.V.RodrIguez, L.Xie, Z.Y.Xu, X.F.Yang, D.T.Yordanov

High-resolution laser spectroscopy of 27-32Al

NUCLEAR MOMENTS 27,28,29,30,31,32Al; measured hyperfine structure spectra of the 3s23p2P3/20 to 3s24s2S1/2 atomic transition using collinear laser spectroscopy at the COLLAPS-ISOLDE-CERN facility; deduced hyperfine parameters, magnetic dipole moments and spectroscopic quadrupole moments with reference to those for 27Al, isotope shifts and mean-square charge radii relative to 27Al. Comparison with theoretical calculations using ab initio valence space in-medium similarity renormalization group method (VS-IMSRG) with multiple sets of two- and three-nucleon forces from chiral effective field theory, and with previous available experimental results. Neutral atoms of 27,28,29,30,31,32Al produced in U(p, X), E=1.4-GeV, using uranium carbide target, followed by extraction from the target, ionized by a resonance ionization laser ion source (RILIS), accelerated to 30 keV, and finally mass separated.

doi: 10.1103/PhysRevC.103.014318
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2021KO26      Phys.Lett. B 819, 136439 (2021)

A.Koszorus, L.J.Vormawah, R.Beerwerth, M.L.Bissell, P.Campbell, B.Cheal, C.S.Devlin, T.Eronen, S.Fritzsche, S.Geldhof, H.Heylen, J.D.Holt, A.Jokinen, S.Kelly, I.D.Moore, T.Miyagi, S.Rinta-Antila, A.Voss, C.Wraith

Proton-neutron pairing correlations in the self-conjugate nucleus 42Sc

NUCLEAR MOMENTS 42,43,44,45,46Sc; measured frequencies; deduced hyperfine spectrum, magnetic dipole, electric quadrupole parameters, rms radii. Comparison with the shell-model and IMSRG calculations.

doi: 10.1016/j.physletb.2021.136439
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2021LE02      Phys.Rev.Lett. 126, 042501 (2021)

E.Leistenschneider, E.Dunling, G.Bollen, B.A.Brown, J.Dilling, A.Hamaker, J.D.Holt, A.Jacobs, A.A.Kwiatkowski, T.Miyagi, W.S.Porter, D.Puentes, M.Redshaw, M.P.Reiter, R.Ringle, R.Sandler, C.S.Sumithrarachchi, A.A.Valverde, I.T.Yandow, TITAN Collaboration

Precision Mass Measurements of Neutron-Rich Scandium Isotopes Refine the Evolution of N = 32 and N = 34 Shell Closures

ATOMIC MASSES 50,51,52,53,54,55Sc; measured frequencies of cyclotron motion; deduced TOF-ICR spectrum, mass excess, mass ratios. Comparison with the AME2016 atomic mass evaluation data, predictions from both ab initio and phenomenological nuclear theories.

doi: 10.1103/PhysRevLett.126.042501
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2021LI58      Phys.Rev. C 104, 044331 (2021)

B.D.Linh, A.Corsi, A.Gillibert, A.Obertelli, P.Doornenbal, C.Barbieri, S.Chen, L.X.Chung, T.Duguet, M.Gomez-Ramos, J.D.Holt, A.Moro, P.Navratil, K.Ogata, N.T.T.Phuc, N.Shimizu, V.Soma, Y.Utsuno, N.L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, N.Chiga, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, F.Flavigny, S.Franchoo, I.Gasparic, R.-B.Gerst, J.Gibelin, K.I.Hahn, N.T.Khai, D.Kim, T.Koiwai, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, D.Sohler, P.-A.Soderstrom, S.Takeuchi, N.D.Ton, H.Tornqvist, V.Vaquero, V.Wagner, H.Wang, V.Werner, X.Xu, Y.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Investigation of the ground-state spin inversion in the neutron-rich 47, 49Cl isotopes

NUCLEAR REACTIONS 1H(50Ar, 2p)49Cl, (50Ar, 2n2p)47Cl; 1H(52K, n3p)49Cl; 1H(48Cl, np)47Cl, [secondary ion beams from 9Be(70Zn, X), E=345 MeV/nucleon primary reaction at RIBF-RIKEN facility, followed by separation of ions by BigRIPS separator using Bπ-ΔE-TOF measurement and MINOS hydrogen target system]; measured reaction products, A/Q versus Z plot, scattered ions of 47Cl and 49Cl using the SAMURAI spectrometer and identified by A/Q and Z, Eγ, Iγ, γγ-coin using DALI2+ array of 226 NaI(Tl) detectors. 47,49Cl; deduced levels, J and π for 49Cl, parallel and transverse momentum distributions and L-transfers for 49Cl, inclusive cross sections. Comparison of experimental level structure with shell-model calculations using SDPF-MU interactions, and IMSRG calculation. Comparison of momentum distributions with distorted-wave impulse approximation (DWIA), and transfer to continuum (TC) methods. Comparison of inclusive cross sections with LISE++ theoretical calculations. 49Cl; calculated levels, J, π, T1/2 of levels, B(E2), B(M1) using SDFP-MU shell-model. 45,47,49Cl; calculated levels, J, π, spectroscopic factors using shell-model and ab initio approaches. 41,43,45,47Cl; spin inversion issue not settled. Comparison of experimental and theoretical (from CGF) energy difference between the first 1/2+ and 3/2+ states in 35,36,37,38,39,40,41,43,45,47,49,51,53Cl, 37,38,39,40,41,43,45,47,49,51,53,55K.

doi: 10.1103/PhysRevC.104.044331
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2021MA46      Phys.Rev. C 104, 014324 (2021)

M.S.Martin, S.R.Stroberg, J.D.Holt, K.G.Leach

Testing isospin symmetry breaking in ab initio nuclear theory

NUCLEAR STRUCTURE A=10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62, 66, 70, 74; calculated coefficients of the isobaric multiplet mass equation (IMME) using the valence-space in-medium similarity renormalization group (VS-IMSRG) method, and two different Hamiltonians from chiral effective field theory. Comparison with experimental results for all T=1 isobaric analog triplets of relevance to superallowed β decay.

doi: 10.1103/PhysRevC.104.014324
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2021MO23      Nat.Phys. 17, 1099 (2021)

M.Mougeot, D.Atanasov, J.Karthein, R.N.Wolf, P.Ascher, K.Blaum, K.Chrysalidis, G.Hagen, J.D.Holt, W.J.Huang, G.R.Jansen, I.Kulikov, Yu.A.Litvinov, D.Lunney, V.Manea, T.Miyagi, T.Papenbrock, L.Schweikhard, A.Schwenk, T.Steinsberger, S.R.Stroberg, Z.H.Sun, A.Welker, F.Wienholtz, S.G.Wilkins, K.Zuber

Mass measurements of 99-101In challenge ab initio nuclear theory of the nuclide 100Sn

NUCLEAR REACTIONS La(p, X)99In/100In/101In, E=1.4 GeV; measured reaction products, TOF; deduced atomic masses. Comparison with AME2020, theoretical calculations.

doi: 10.1038/s41567-021-01326-9
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2021ST03      Phys.Rev.Lett. 126, 022501 (2021)

S.R.Stroberg, J.D.Holt, A.Schwenk, J.Simonis

Ab Initio Limits of Atomic Nuclei

NUCLEAR STRUCTURE Z=1-26; calculated probabilities for given isotopes to be bound with respect to one- or two-neutron (proton) removals, separation energies, dripline using a chiral two- and three-nucleon interaction with good saturation properties, we use the valence-space in-medium similarity renormalization group. Comparison with available data.

doi: 10.1103/PhysRevLett.126.022501
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2021YA03      Phys.Rev. C 103, 014315 (2021)

J.M.Yao, A.Belley, R.Wirth, T.Miyagi, C.G.Payne, S.R.Stroberg, H.Hergert, J.D.Holt

Ab initio benchmarks of neutrinoless double-β decay in light nuclei with a chiral Hamiltonian

RADIOACTIVITY 6,8He, 10Be, 14C, 22O(2β-); calculated nuclear matrix elements (NMEs) for isospin-conserving and isospin-changing 0νββ decay modes. Valence-space in-medium similarity renormalization group (VS-IMSRG) and importance-truncated no-core shell model (IT-NCSM) calculations. Comparison with results of calculations using NCSM and coupled-cluster theory with singles and doubles plus leading-order triples excitations (CC-SDT1).

NUCLEAR STRUCTURE 6,8He, 6,8,10Be, 10,14C, 14,22O, 22Ne; calculated energies per nucleon (E/A) using VS-IMSRG, in-medium generator coordinate (IM-GCM), and IT-NCSM calculations, and compared with those from the CC-SDT1 calculations.

doi: 10.1103/PhysRevC.103.014315
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2020CI02      Phys.Rev. C 101, 021303 (2020)

M.Ciemala, S.Ziliani, F.C.L.Crespi, S.Leoni, B.Fornal, A.Maj, P.Bednarczyk, G.Benzoni, A.Bracco, C.Boiano, S.Bottoni, S.Brambilla, M.Bast, M.Beckers, T.Braunroth, F.Camera, N.Cieplicka-Orynczak, E.Clement, S.Coelli, O.Dorvaux, S.Erturk, G.de France, C.Fransen, A.Goldkuhle, J.Grebosz, M.N.Harakeh, L.W.Iskra, B.Jacquot, A.Karpov, M.Kicinska-Habior, Y.Kim, M.Kmiecik, A.Lemasson, S.M.Lenzi, M.Lewitowicz, H.Li, I.Matea, K.Mazurek, C.Michelagnoli, M.Matejska-Minda, B.Million, C.Muller-Gatermann, V.Nanal, P.Napiorkowski, D.R.Napoli, R.Palit, M.Rejmund, Ch.Schmitt, M.Stanoiu, I.Stefan, E.Vardaci, B.Wasilewska, O.Wieland, M.Zieblinski, M.Zielinska, A.Atac, D.Barrientos, B.Birkenbach, A.J.Boston, B.Cederwall, L.Charles, J.Collado, D.M.Cullen, P.Desesquelles, C.Domingo-Pardo, J.Dudouet, J.Eberth, V.Gonzalez, J.Goupil, L.J.Harkness-Brennan, H.Hess, D.S.Judson, A.Jungclaus, W.Korten, M.Labiche, A.Lefevre, R.Menegazzo, D.Mengoni, J.Nyberg, R.M.Perez-Vidal, Zs.Podolyak, A.Pullia, F.Recchia, P.Reiter, F.Saillant, M.D.Salsac, E.Sanchis, O.Stezowski, Ch.Theisen, J.J.Valiente-Dobon, J.D.Holt, J.Menendez, A.Schwenk, J.Simonis

Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2+ state in 16C and 20O

NUCLEAR REACTIONS 181Ta(18O, X)16C/19O/20O, E=7.0 MeV/nucleon; measured reaction products, Eγ, Iγ, (particle)γ-coin, level half-lives by Doppler-shift attenuation method and Monte Carlo simulations using AGATA array, coupled to the PARIS scintillator array and to the VAMOS++ magnetic spectrometer at GANIL. 16C, 19,20O; deduced levels, J, π. Comparison with predictions of the valence-space in-medium similarity renormalization group (VS-IMSRG) and the no-core shell model (NCSM) with NN and 3N interactions.

doi: 10.1103/PhysRevC.101.021303
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2020CO01      Phys.Lett. B 800, 135071 (2020)

M.L.Cortes, W.Rodriguez, P.Doornenbal, A.Obertelli, J.D.Holt, S.M.Lenzi, J.Menendez, F.Nowacki, K.Ogata, A.Poves, T.R.Rodriguez, A.Schwenk, J.Simonis, S.R.Stroberg, K.Yoshida, L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, L.X.Chung, F.Flavigny, S.Franchoo, I.Gasparic, R.-B.Gerst, J.Gibelin, K.I.Hahn, D.Kim, T.Koiwai, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, B.D.Linh, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, D.Sohler, P.-A.Soderstrom, S.Takeuchi, H.Toernqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

Shell evolution of N=40 isotones towards 60Ca: First spectroscopy of 62Ti

NUCLEAR REACTIONS 1H(63V, 2p)62Ti, E≈200 MeV/nucleon, [secondary 63V beam from 9Be(70Zn, X), E=345 MeV/nucleon primary reaction followed by separation of fragments of interest event-by-event using BigRIPS spectrometer at RIBF-RIKEN]; measured yields of reaction products with Z=22-24 and A/Q=2.60 to 2.85, Eγ, Iγ, γγ-coin using MINOS device, SAMURAI dipole magnet, Time Projection Chamber (TPC), and DALI2+ array of 226 NaI(Tl) detectors. 62Ti; deduced first 2+ and 4+ levels, cross sections. Comparison with theoretical calculations for N=40, Z=20-32 (even) using large-scale shell model (LSSM), symmetry conserving configuration mixing (SCCM) with Gogny D1S effective interaction, and valence-space in-medium similarity renormalization group (VS-IMSRG).

doi: 10.1016/j.physletb.2019.135071
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2020CO12      Phys.Rev. C 102, 064320 (2020)

M.L.Cortes, W.Rodriguez, P.Doornenbal, A.Obertelli, J.D.Holt, J.Menendez, K.Ogata, A.Schwenk, N.Shimizu, J.Simonis, Y.Utsuno, K.Yoshida, L.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, H.N.Liu, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, L.X.Chung, F.Flavigny, S.Franchoo, I.Gasparic, R.-B.Gerst, J.Gibelin, K.I.Hahn, D.Kim, T.Koiwai, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, B.D.Linh, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, P.-A.Soderstrom, D.Sohler, S.Takeuchi, H.Toernqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

N = 32 shell closure below calcium: Low-lying structure of 50Ar

NUCLEAR REACTIONS 1H(52Ca, 3p), E=266 MeV; 1H(53Ca, n3p), E=258 MeV; 1H(54Ca, 2n3p), E=251 MeV; 1H(55Ca, 3n3p), E=247 MeV; 1H(51K, 2p), E=257 MeV; 1H(52K, n2p), E=250 MeV; 1H(53K, 2n2p), E=245 MeV; 1H(51Ar, np), E=241 MeV; 1H(50Ar, p'), [secondary 52,53,54,55Ca, 51,52,53K, 50,51Ar beams from 9Be(70Zn, X), E=345 MeV/nucleon primary beam, followed by separation of fragments using BigRIPS separator at RIBF-RIKEN facility]; measured reaction products, yields, inclusive σ, Eγ, Iγ, γγ-coin using the MINOS hydrogen target, time projection chamber, SAMURAI dipole magnet, and DALI2+ array of 226 NaI(Tl) detectors. 50Ar; deduced Doppler corrected γ-ray spectra, levels, J, π; calculated levels, J, π, spectroscopic factors and cross sections for levels using the SDPF-MU shell model, and ab initio VS-IMSRG approach.

doi: 10.1103/PhysRevC.102.064320
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2020DE21      Nat.Phys. 16, 620 (2020)

R.P.de Groote, J.Billowes, C.L.Binnersley, M.L.Bissell, T.E.Cocolios, T.Day Goodacre, G.J.Farooq-Smith, D.V.Fedorov, K.T.Flanagan, S.Franchoo, R.F.Garcia Ruiz, W.Gins, J.D.Holt, A.Koszorus, K.M.Lynch, T.Miyagi, W.Nazarewicz, G.Neyens, P.-G.Reinhard, S.Rothe, H.H.Stroke, A.R.Vernon, K.D.A.Wendt, S.G.Wilkins, Z.Y.Xu, X.F.Yang

Measurement and microscopic description of odd-even staggering of charge radii of exotic copper isotopes

NUCLEAR MOMENTS 63,64,65,68,69,70,71,72,73,74,75,76,77,78Cu; measured laser frequencies; deduced isotope shifts, charge radii. Isotope Mass Separator On-Line Device facility (ISOLDE) at CERN.

doi: 10.1038/s41567-020-0868-y
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2020HE25      Phys.Lett. B 809, 135678 (2020)

S.Heil, M.Petri, K.Vobig, D.Bazin, J.Belarge, P.Bender, B.A.Brown, R.Elder, B.Elman, A.Gade, T.Haylett, J.D.Holt, T.Huther, A.Hufnagel, H.Iwasaki, N.Kobayashi, C.Loelius, B.Longfellow, E.Lunderberg, M.Mathy, J.Menendez, S.Paschalis, R.Roth, A.Schwenk, J.Simonis, I.Syndikus, D.Weisshaar, K.Whitmore

Electromagnetic properties of 21O for benchmarking nuclear Hamiltonians

NUCLEAR REACTIONS 9Be(24F, 21O), E=95 MeV/nucleon; measured reaction products, Eγ, Iγ. 21O; deduced γ-ray energies, J, π, level T1/2, B(E2). Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2020.135678
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2020MA09      Phys.Rev.Lett. 124, 092502 (2020)

V.Manea, J.Karthein, D.Atanasov, M.Bender, K.Blaum, T.E.Cocolios, S.Eliseev, A.Herlert, J.D.Holt, W.J.Huang, Y.A.Litvinov, D.Lunney, J.Menendez, M.Mougeot, D.Neidherr, L.Schweikhard, A.Schwenk, J.Simonis, A.Welker, F.Wienholtz, K.Zuber

First Glimpse of the N=82 Shell Closure below Z=50 from Masses of Neutron-Rich Cadmium Isotopes and Isomers

ATOMIC MASSES 124,126,127,127m,128,129,129m,131,132Cd; measured mass excesses using phase-imaging ion cyclotron-resonance (PI-ICR) method with the ISOLTRAP spectrometer at ISOLDE-CERN. Cd isotopes were produced in U(p, F), E=1.4 GeV reaction followed by separation of fission fragments using ISOLDE High-resolution separator. Comparison with literature data in AME2016 evaluation, and with large-scale shell-model, mean-field, beyond-mean-field, and ab initio valence-space in-medium similarity renormalization group (VS-IMSRG) calculations. Systematics of S(n) for N=81, 83 and Z=48-68, and for two-neutron shell gaps for N=82, Z=42-70 nuclei.

doi: 10.1103/PhysRevLett.124.092502
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2020MI15      Phys.Rev. C 102, 034320 (2020)

T.Miyagi, S.R.Stroberg, J.D.Holt, N.Shimizu

Ab initio multishell valence-space Hamiltonians and the island of inversion

NUCLEAR STRUCTURE 16O; calculated levels, J, π, single-particle energies with 4He core and psd valence space, ground-state energies and expectation values of the Hamiltonian with the 4He and p, pd5/2, pd5/2s1/2, and psd valence spaces. 26,28,30,32,34Ne, 28,30,32,34,36Mg, 30,32,34,36,38Si; calculated excitation energies of the first excited 0+ states, and the number of exciting neutrons from sd to pf orbits. 20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37Ne, 22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39Mg, 24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42Si; calculated ground-state energies, S(2n), energies of the first 2+ states and corresponding B(E2) values for even-even nuclei. 26,30Ne, 32Mg, 34Si; calculated energies and B(E2) of the 0+ and 2+ excited states from sd and sdf7/2p3/2 orbitals. 14,15,16,17,18,19,20,21,22O; calculated ground-state energies and charge radii. 40,41,42,43,44,45,46,47,48Ca; calculated changes in charge radii. Valence-space in-medium similarity renormalization group (VS-IMSRG) approach to derive the first multishell valence-space Hamiltonians from ab initio theory for calculation of properties of nuclei in the island-of-inversion region above oxygen. Comparison with experimental data.

doi: 10.1103/PhysRevC.102.034320
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2020MO25      Phys.Rev. C 102, 014301 (2020)

M.Mougeot, D.Atanasov, C.Barbieri, K.Blaum, M.Breitenfeld, A.de Roubin, T.Duguet, S.George, F.Herfurth, A.Herlert, J.D.Holt, J.Karthein, D.Lunney, V.Manea, P.Navratil, D.Neidherr, M.Rosenbusch, L.Schweikhard, A.Schwenk, V.Soma, A.Welker, F.Wienholtz, R.N.Wolf, K.Zuber

Examining the N=28 shell closure through high-precision mass measurements of 46-48Ar

ATOMIC MASSES 46,47,48Ar; measured Ramsey-type time-of-flight ion-cyclotron-resonances (TOF-ICR), mass excesses using the ISOLTRAP Penning trap mass spectrometer at CERN-ISOLDE. Comparison with previous experimental results, and with AME2016 and AME2012 evaluations. Radioactive argon isotopes produced in U(p, F), E=1.4 GeV reaction, and separated using ISOLTRAP on-line mass spectrometer and the ISOLDE High-Resolution Separator (HRS). Comparison with ab initio calculations using the valence space in-medium similarity renormalization group (VS-IMSRG) with self-consistent Green's function approach, and with the predictions from the UNEDF0 density functional, SDPF-U shell model. Systematics of S(2n) and pairing gaps in N=24-32 S, Cl, Ar, K, and Ca isotopes.

doi: 10.1103/PhysRevC.102.014301
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2020WH02      Phys.Rev. C 102, 024327 (2020)

K.Whitmore, C.Andreoiu, F.H.Garcia, K.Ortner, J.D.Holt, T.Miyagi, G.C.Ball, N.Bernier, H.Bidaman, V.Bildstein, M.Bowry, D.S.Cross, M.R.Dunlop, R.Dunlop, A.B.Garnsworthy, P.E.Garrett, J.Henderson, J.Measures, B.Olaizola, J.Park, C.M.Petrache, J.L.Pore, J.K.Smith, D.Southall, C.E.Svensson, M.Ticu, J.Turko, T.Zidar

β decay of 132In and spectroscopy of 132Sn and 131Sb with the GRIFFIN spectrometer

RADIOACTIVITY 132In(β-), (β-n)[132In beam from U(p, X), E=480 MeV, followed by selection of ions through Ion-Guide Laser Ion Source (IG-LIS) at TRIUMF-ISAC]; 131mSn(β-)[from 132In β-n decay]; measured Eγ, Iγ, Eβ, βγ- and γγ-coin, γγ(θ), half-life of 132In decay using GRIFFIN array for γ detection, and SCEPTAR array for β particles. 132In; deduced beta-delayed neutron emission probability or Pn for decay of 132In from total number of decays and γ intensities. 131Sb, 132Sn; deduced levels, J, π, γ-branching ratios, mixing ratio for a transition in 132Sn, β feedings and logft values for levels in 132Sn. Comparison with VS-IMSRG theoretical calculations for positive-parity states in 132Sn. Comparison with evaluated data in the ENSDF database.

doi: 10.1103/PhysRevC.102.024327
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2020ZH30      Phys.Rev.Lett. 125, 112503 (2020)

X.Zhang, S.R.Stroberg, P.Navratil, C.Gwak, J.A.Melendez, R.J.Furnstahl, J.D.Holt

Ab Initio Calculations of Low-Energy Nuclear Scattering Using Confining Potential Traps

NUCLEAR REACTIONS 4He, 24O(n, n), E<3.5 MeV; calculated phase shifts and error bands.

doi: 10.1103/PhysRevLett.125.112503
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2019EV01      Phys.Rev. C 99, 024306 (2019)

L.J.Evitts, A.B.Garnsworthy, T.Kibedi, J.Smallcombe, M.W.Reed, A.E.Stuchbery, G.J.Lane, T.K.Eriksen, A.Akber, B.Alshahrani, M.de Vries, M.S.M.Gerathy, J.D.Holt, B.Q.Lee, B.P.McCormick, A.J.Mitchell, M.Moukaddam, S.Mukhopadhyay, N.Palalani, T.Palazzo, E.E.Peters, A.P.D.Ramirez, T.Tornyi, S.W.Yates

E0 transition strength in stable Ni isotopes

NUCLEAR REACTIONS 58,60,62Ni(p, p'), E=4.7-9.2 MeV; measured Eγ, Iγ, γ(θ), conversion electrons using the CAESAR array for γ detection and Super-e spectrometer for electron detection at ANU-Canberra. 58,60,62Ni(n, n'), E=2.42, 2.90 MeV; measured Eγ, Iγ, level half-lives by DSAM at the University of Kentucky Accelerator Laboratory. 58,60,62Ni; deduced levels, J, π, K-conversion coefficients, E2/M1 multipole mixing ratios and E0 admixtures in 2+ to 2+ transitions, 0+ to 0+ E0 transitions, electric monopole (E0) transition strengths, B(M1), B(E2). Comparison with evaluated data in Nuclear Data Sheets. Systematics of 2+ to 2+ and 0+ to 0+ monopole transition strengths ρ2(E0) in even-even nuclei with A<250.

doi: 10.1103/PhysRevC.99.024306
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2019GY02      Nat.Phys. 15, 428 (2019)

P.Gysbers, G.Hagen, J.D.Holt, G.R.Jansen, T.D.Morris, P.Navratil, T.Papenbrock, S.Quaglioni, A.Schwenk, S.R.Stroberg, K.A.Wendt

Discrepancy between experimental and theoretical β-decay rates resolved from first principles

NUCLEAR STRUCTURE 3H, 6Li, 7Be, 8He, 10C, 14O, 19,24Ne, 37K, 25,28Al, 24,26Na, 30Mg, 33,34P, 42,43,46Sc, 42,45Ti, 45,47V, 100Sn; calculated the Gamow–Teller strength for β decay.

doi: 10.1038/s41567-019-0450-7
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2019KL06      Phys.Rev. C 99, 061301 (2019)

A.Klose, K.Minamisono, A.J.Miller, B.A.Brown, D.Garand, J.D.Holt, J.D.Lantis, Y.Liu, B.Maass, W.Nortershauser, S.V.Pineda, D.M.Rossi, A.Schwenk, F.Sommer, C.Sumithrarachchi, A.Teigelhofer, J.Watkins

Ground-state electromagnetic moments of 37Ca

NUCLEAR MOMENTS 37,39Ca; measured hyperfine structure spectra using the collinear laser spectroscopy technique at NSCL-BECOLA facility; deduced hyperfine coupling constants, and isoscalar- and isovector-magnetic moment of the ground states. 37,39Ca produced in 9Be(40Ca, X), E=140 MeV/nucleon reaction, and separation of fragments using A1900 fragment separator at NSCL-MSU. Comparison with shell model calculations using the universal sd model-space Hamiltonians (USDA/B). Systematics of experimental and theoretical magnetic moments of ground states of 37,39Ca, 37Cl and 39K.

doi: 10.1103/PhysRevC.99.061301
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2019LE11      Phys.Rev. C 100, 014320 (2019)

K.G.Leach, J.D.Holt, P.E.Garrett, S.R.Stroberg, G.C.Ball, P.C.Bender, V.Bildstein, A.Diaz Varela, R.Dunlop, T.Faestermann, B.Hadinia, R.Hertenberger, D.S.Jamieson, B.Jigmeddorj, R.Krucken, A.T.Laffoley, A.J.Radich, E.T.Rand, C.E.Svensson, S.Triambak, H.-F.Wirth

High-resolution (p, t) reaction measurements as spectroscopic tests of ab-initio theory in the mid-pf shell

NUCLEAR REACTIONS 52Cr, 64Zn(p, t), (p, p), E=24 MeV; measured Ep, Ip, E(t), I(t), differential σ(θ) using Q3D spectrometer at the MLL, Garching tandem accelerator facility; deduced optical model parameters. 50Cr, 62Zn; deduced levels, J, π. Comparison with ab-initio shell-model calculations using chiral effective field theory with the valence-space in-medium similarity renormalization group method (VS-IMSRG), and with evaluated data in the ENSDF database.

doi: 10.1103/PhysRevC.100.014320
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2019LI10      Phys.Rev.Lett. 122, 072502 (2019)

H.N.Liu, A.Obertelli, P.Doornenbal, C.A.Bertulani, G.Hagen, J.D.Holt, G.R.Jansen, T.D.Morris, A.Schwenk, R.Stroberg, N.Achouri, H.Baba, F.Browne, D.Calvet, F.Chateau, S.Chen, N.Chiga, A.Corsi, M.L.Cortes, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, C.Hilaire, T.Isobe, T.Kobayashi, Y.Kubota, V.Lapoux, T.Motobayashi, I.Murray, H.Otsu, V.Panin, N.Paul, W.Rodriguez, H.Sakurai, M.Sasano, D.Steppenbeck, L.Stuhl, Y.L.Sun, Y.Togano, T.Uesaka, K.Wimmer, K.Yoneda, O.Aktas, T.Aumann, L.X.Chung, F.Flavigny, S.Franchoo, I.Gasparic, R.-B.Gerst, J.Gibelin, K.I.Hahn, D.Kim, T.Koiwai, Y.Kondo, P.Koseoglou, J.Lee, C.Lehr, B.D.Linh, T.Lokotko, M.MacCormick, K.Moschner, T.Nakamura, S.Y.Park, D.Rossi, E.Sahin, D.Sohler, P.-A.Soderstrom, S.Takeuchi, H.Tornqvist, V.Vaquero, V.Wagner, S.Wang, V.Werner, X.Xu, H.Yamada, D.Yan, Z.Yang, M.Yasuda, L.Zanetti

How Robust is the N=34 Subshell Closure? First Spectroscopy of 52Ar

NUCLEAR REACTIONS 1H(53K, 2p), E=245 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, σ. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.122.072502
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2019PO06      Phys.Rev. C 100, 054327 (2019)

J.L.Pore, C.Andreoiu, J.K.Smith, A.D.MacLean, A.Chester, J.D.Holt, G.C.Ball, P.C.Bender, V.Bildstein, R.Braid, A.Diaz Varela, R.Dunlop, L.J.Evitts, A.B.Garnsworthy, P.E.Garrett, G.Hackman, S.V.Ilyushkin, B.Jigmeddorj, K.Kuhn, P.Kunz, A.T.Laffoley, K.G.Leach, D.Miller, W.J.Mills, W.Moore, M.Moukaddam, L.N.Morrison, B.Olaizola, E.E.Peters, A.J.Radich, E.T.Rand, F.Sarazin, D.Southall, C.E.Svensson, S.J.Williams, S.W.Yates

Detailed spectroscopy of 46Ca: A study of the β- decay of 46K

RADIOACTIVITY 46K(β-)[from U(p, X), E=500 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ), ce, β particles using GRIFFIN array of 15 HPGe detectors for γ detection, PACES array of five Si(Li) detectors for conversion electrons, and SCEPTAR array of 10 plastic scintillators for β-particle tagging, half-life of 46K decay at TRIUMF-ISAC facility. 46Ca; deduced levels, J, π, β feedings, logft, γ-branching ratios, multipole mixing ratios. Comparison of level structure with theoretical predictions from microscopic valence space Hamiltonians derived from NN+3N forces.

doi: 10.1103/PhysRevC.100.054327
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2019RA06      Phys.Rev. C 99, 021301 (2019)

J.S.Randhawa, R.Kanungo, M.Holl, J.D.Holt, P.Navratil, S.R.Stroberg, G.Hagen, G.R.Jansen, M.Alcorta, C.Andreoiu, C.Barnes, C.Burbadge, D.Burke, A.A.Chen, A.Chester, G.Christian, S.Cruz, B.Davids, J.Even, G.Hackman, J.Henderson, S.Ishimoto, P.Jassal, S.Kaur, M.Keefe, D.Kisliuk, R.Krucken, J.Liang, J.Lighthall, E.McGee, J.Measures, M.Moukaddam, E.Padilla-Rodal, A.Shotter, I.J.Thompson, J.Turko, M.Williams, O.Workman

Observation of excited states in 20Mg sheds light on nuclear forces and shell evolution

NUCLEAR REACTIONS 2H(20Mg, d), (20Mg, d'), E=8.5 MeV/nucleon, [secondary 20Mg beam produced in Si(p, X), E=480 MeV fragmentation reaction using SiC target at ISAC-II facility]; measured scattered deuteron spectra, differential σ(θ) using annular single-sided silicon strip detector array and CsI(Tl) detectors (IRIS reaction spectroscopy facility) at TRIUMF. 20Mg; deduced levels, J, π, proton-unbound resonances. Comparison with ab initio calculations using the valence-space in-medium similarity renormalization-group (VS-IMSRG) approach.

doi: 10.1103/PhysRevC.99.021301
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2019TA10      Nature(London) 569, 53 (2019)

R.Taniuchi, C.Santamaria, P.Doornenbal, A.Obertelli, K.Yoneda, G.Authelet, H.Baba, D.Calvet, F.Chateau, A.Corsi, A.Delbart, J.-M.Gheller, A.Gillibert, J.D.Holt, T.Isobe, V.Lapoux, M.Matsushita, J.Menendez, S.Momiyama, T.Motobayashi, M.Niikura, F.Nowacki, K.Ogata, H.Otsu, T.Otsuka, C.Péron, S.Peru, A.Peyaud, E.C.Pollacco, A.Poves, J.-Y.Rousse, H.Sakurai, A.Schwenk, Y.Shiga, J.Simonis, S.R.Stroberg, S.Takeuchi, Y.Tsunoda, T.Uesaka, H.Wang, F.Browne, L.X.Chung, Z.Dombradi, S.Franchoo, F.Giacoppo, A.Gottardo, K.Hadynska-Klek, Z.Korkulu, S.Koyama, Y.Kubota, J.Lee, M.Lettmann, C.Louchart, R.Lozeva, K.Matsui, T.Miyazaki, S.Nishimura, L.Olivier, S.Ota, Z.Patel, E.Sahin, C.Shand, P.-A.Soderstrom, I.Stefan, D.Steppenbeck, T.Sumikama, D.Suzuki, Z.Vajta, V.Werner, J.Wu, Z.Y.Xu

78Ni revealed as a doubly magic stronghold against nuclear deformation

NUCLEAR REACTIONS 1H(79Cu, 2p), (80Zn, 3p)78Ni, E ∼ 250 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced partial σ, energy levels, J, π, magic nature. Comparison with theoretical calculations.

doi: 10.1038/s41586-019-1155-x
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2019XU09      Phys.Rev. C 99, 064303 (2019)

X.Xu, M.Wang, K.Blaum, J.D.Holt, Yu.A.Litvinov, A.Schwenk, J.Simonis, S.R.Stroberg, Y.H.Zhang, H.S.Xu, P.Shuai, X.L.Tu, X.H.Zhou, F.R.Xu, G.Audi, R.J.Chen, X.C.Chen, C.Y.Fu, Z.Ge, W.J.Huang, S.Litvinov, D.W.Liu, Y.H.Lam, X.W.Ma, R.S.Mao, A.Ozawa, B.H.Sun, Y.Sun, T.Uesaka, G.Q.Xiao, Y.M.Xing, T.Yamaguchi, Y.Yamaguchi, X.L.Yan, Q.Zeng, H.W.Zhao, T.C.Zhao, W.Zhang, W.L.Zhan

Masses of neutron-rich 52-54Sc and 54, 56Ti nuclides: The N=32 subshell closure in scandium

ATOMIC MASSES 52,53,54Sc, 54,56Ti; measured mass excesses using isochronous mass spectrometry at CRSe-HIRFL, Lanzhou. Isotopes produced in 9Be(86Kr, X), E=460.65 MeV/nucleon reaction and separated using RIBLL2. Comparison with AME-2012 evaluation, and results from six previous experiments, and with valence-space in-medium similarity renormalization group (VS-IMSRG) calculations. Systematics of S(2n) values in N=27-34 K, Ca, Sc, Ti isotopic chains, and those of empirical shell gaps in N=24-34 K, Ca, Sc, Ti isotopic chains and Z=19-25 N=32 isotones.

doi: 10.1103/PhysRevC.99.064303
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2018EV01      Phys.Lett. B 779, 396 (2018)

L.J.Evitts, A.B.Garnsworthy, T.Kibedi, J.Smallcombe, M.W.Reed, B.A.Brown, A.E.Stuchbery, G.J.Lane, T.K.Eriksen, A.Akber, B.Alshahrani, M.de Vries, M.S.M.Gerathy, J.D.Holt, B.Q.Lee, B.P.McCormick, A.J.Mitchell, M.Moukaddam, S.Mukhopadhyay, N.Palalani, T.Palazzo, E.E.Peters, A.P.D.Ramirez, S.R.Stroberg, T.Tornyi, S.W.Yates

Identification of significant E0 strength in the 2+2 → 2+1 transitions of 58, 60, 62Ni

NUCLEAR REACTIONS 58,60,62Ni(p, p'), E<9.2 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, nuclear and quadrupole moments, B(E2), B(M1). Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2018.01.076
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2018GA22      Acta Phys.Pol. B49, 229 (2018)

P.E.Garrett, K.G.Leach, A.D.MacLean, G.C.Ball, P.C.Bender, V.Bildstein, B.A.Brown, C.Burbadge, A.Diaz Varela, R.Dunlop, T.Faestermann, B.Hadinia, R.Hertenberger, J.D.Holt, A.T.Laffoley, D.S.Jamieson, B.Jigmeddorj, A.J.Radich, E.T.Rand, S.R.Stroberg, C.E.Svensson, I.S.Towner, S.Triambak, H.-F.Wirth

Nuclear Structure Studied with Direct Reactions for Fundamental Symmetry Tests

NUCLEAR REACTIONS 52Cr(p, t)50Cr;64Zn(p, t)62Zn, E=24 MeV; measured reaction products momenta using Q3D magnetic spectrograph, Eγ, Iγ, γγ-coin; deduced peaks in triton spectra, σ(θ) vs θcm for reactions to given final states, angular correlation measurement of 1389-954 keV cascade in 62Zn following the β+/EC decay of 62Ga (preliminary).

doi: 10.5506/APhysPolB.49.229
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2018HE12      Phys.Lett. B 782, 468 (2018)

J.Henderson, G.Hackman, P.Ruotsalainen, S.R.Stroberg, K.D.Launey, J.D.Holt, F.A.Ali, N.Bernier, M.A.Bentley, M.Bowry, R.Caballero-Folch, L.J.Evitts, R.Frederick, A.B.Garnsworthy, P.E.Garrett, B.Jigmeddorj, A.I.Kilic, J.Lassen, J.Measures, D.Muecher, B.Olaizola, E.O'Sullivan, O.Paetkau, J.Park, J.Smallcombe, C.E.Svensson, R.Wadsworth, C.Y.Wu

Testing microscopically derived descriptions of nuclear collectivity: Coulomb excitation of 22Mg

NUCLEAR REACTIONS 110Pd(22Mg, 22Mg'), (22Ne, 22Ne'), E=83.4, 92.4 MeV; measured reaction products, Eγ, Iγ. 22Ne, 22Mg; deduced γ-ray energies, B(E2) values and quadrupole moments. Comparison with the state-of-the-art no-core symplectic shell model calculations.

doi: 10.1016/j.physletb.2018.05.064
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2018IZ01      Phys.Rev. C 97, 014309 (2018)

C.Izzo, G.Bollen, M.Brodeur, M.Eibach, K.Gulyuz, J.D.Holt, J.M.Kelly, M.Redshaw, R.Ringle, R.Sandler, S.Schwarz, S.R.Stroberg, C.S.Sumithrarachchi, A.A.Valverde, A.C.C.Villari

Precision mass measurements of neutron-rich Co isotopes beyond N=40

ATOMIC MASSES 68,69Co; measured time-of-flight ion cyclotron resonances (TOF-ICR), mass excesses using LEBIT Penning trap system at NSCL-MSU facility. Comparison with AME-2016 values. Systematics of S(2n) values in N=36-44 Fe, Co, Ni and Cu nuclides. Discussed low- and high-spin isomers in 68Co and 69Co, and concluded the main contribution from the high-spin activities.

RADIOACTIVITY 68,69Co(β-)[from 9Be(76Ge, X), E=130 MeV/nucleon followed by fragment selection using A1900 fragment separator]; measured Eγ, Iγ from the decay of 68Co. 68,69Co; calculated levels, J, π by ab initio approach using the valence-space in-medium similarity renormalization group (VS-IMSRG) framework based on two-nucleon (NN) and three-nucleon (3N) forces from chiral effective field theory; discussed energy ordering of the ground state and isomer.

doi: 10.1103/PhysRevC.97.014309
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2018LE03      Phys.Rev.Lett. 120, 062503 (2018)

E.Leistenschneider, M.P.Reiter, S.Ayet San Andres, B.Kootte, J.D.Holt, P.Navratil, C.Babcock, C.Barbieri, B.R.Barquest, J.Bergmann, J.Bollig, T.Brunner, E.Dunling, A.Finlay, H.Geissel, L.Graham, F.Greiner, H.Hergert, C.Hornung, C.Jesch, R.Klawitter, Y.Lan, D.Lascar, K.G.Leach, W.Lippert, J.E.McKay, S.F.Paul, A.Schwenk, D.Short, J.Simonis, V.Soma, R.Steinbrugge, S.R.Stroberg, R.Thompson, M.E.Wieser, C.Will, M.Yavor, C.Andreoiu, T.Dickel, I.Dillmann, G.Gwinner, W.R.Plass, C.Scheidenberger, A.A.Kwiatkowski, J.Dilling

Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

ATOMIC MASSES 51V, 51,52,53,54,55Ti, 52,53,54,55Cr; measured radio frequencies, TOF; deduced mass excesses. Comparison with the AME16 recommended values.

doi: 10.1103/PhysRevLett.120.062503
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2018MO07      Phys.Rev.Lett. 120, 152503 (2018)

T.D.Morris, J.Simonis, S.R.Stroberg, C.Stumpf, G.Hagen, J.D.Holt, G.R.Jansen, T.Papenbrock, R.Roth, A.Schwenk

Structure of the Lightest Tin Isotopes

NUCLEAR STRUCTURE 100,108,116,124,132Sn, 101Sn, 105Te; calculated energy levels, J, π using nucleon-nucleon and three-nucleon forces constrained by data of few-nucleon systems.

doi: 10.1103/physrevlett.120.152503
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2018MO14      Phys.Rev.Lett. 120, 232501 (2018)

M.Mougeot, D.Atanasov, K.Blaum, K.Chrysalidis, T.Day Goodacre, D.Fedorov, V.Fedosseev, S.George, F.Herfurth, J.D.Holt, D.Lunney, V.Manea, B.Marsh, D.Neidherr, M.Rosenbusch, S.Rothe, L.Schweikhard, A.Schwenk, C.Seiffert, J.Simonis, S.R.Stroberg, A.Welker, F.Wienholtz, R.N.Wolf, K.Zuber

Precision Mass Measurements of 58-63Cr: Nuclear Collectivity Towards the N=40 Island of Inversion

ATOMIC MASSES 58,59,60,61,62,63Cr; measured cyclotron frequency, TOF; deduced mass excesses. Comparison with AME16, theoretical calculations.

doi: 10.1103/PhysRevLett.120.232501
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2018RE11      Phys.Rev. C 98, 024310 (2018)

M.P.Reiter, S.Ayet San Andres, E.Dunling, B.Kootte, E.Leistenschneider, C.Andreoiu, C.Babcock, B.R.Barquest, J.Bollig, T.Brunner, I.Dillmann, A.Finlay, G.Gwinner, L.Graham, J.D.Holt, C.Hornung, C.Jesch, R.Klawitter, Y.Lan, D.Lascar, J.E.McKay, S.F.Paul, R.Steinbrugge, R.Thompson, J.L.Tracy, M.E.Wieser, C.Will, T.Dickel, W.R.Plass, C.Scheidenberger, A.A.Kwiatkowski, J.Dilling

Quenching of the N=32 neutron shell closure studied via precision mass measurements of neutron-rich vanadium isotopes

ATOMIC MASSES 52,53,54Cr, 51,52,53Ti, 51,52,53,54,55V; measured multiple-reflection time-of-flight mass-Spectrometer and isobar separator (MR-TOF-MS) spectra, time-of-flight ion-cyclotron-resonance (ToF-ICR) resonances, and mass excesses using TRIUMF Ion Trap for Atomic and Nuclear science (TITAN) penning trap; deduced shell gaps for N=26-35 vanadium and calcium isotopes. Comparison with values in AME-2016. Systematics of S(2n) and half-lives for Z=19-24, N=28-36 nuclides. Discussed the evolution of the N=32 neutron shell closure.

doi: 10.1103/PhysRevC.98.024310
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2017BR14      Phys.Rev. C 96, 034316 (2017)

M.Brodeur, A.A.Kwiatkowski, O.M.Drozdowski, C.Andreoiu, D.Burdette, A.Chaudhuri, U.Chowdhury, A.T.Gallant, A.Grossheim, G.Gwinner, H.Heggen, J.D.Holt, R.Klawitter, J.Lassen, K.G.Leach, A.Lennarz, C.Nicoloff, S.Raeder, B.E.Schultz, S.R.Stroberg, A.Teigelhofer, R.Thompson, M.Wieser, J.Dilling

Precision mass measurements of magnesium isotopes and implications for the validity of the isobaric mass multiplet equation

ATOMIC MASSES 27,28,29Mg; measured cyclotron frequencies, mass excesses using TITAN Penning trap at ISAC-TRIUMF facility; deduced S(p). Comparison with AME-2016 evaluated data, and with ab initio calculations from the valence-space in-medium similarity renormalization group. 27,28,29Mg produced in SiC(p, X), E=480 MeV reaction, followed by laser resonance ionization in a radio-frequency ion guide (IG-LIS).29Mg, 29Cl, 30Mg, 30Ar; analyzed isobaric mass multiplet equation (IMME) in the form of a cubic term. 28S, 29Cl; need to confirm mass excess of 28S and S(n) of 29Cl.

doi: 10.1103/PhysRevC.96.034316
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2017CR03      Phys.Rev. C 95, 064317 (2017)

H.L.Crawford, A.O.Macchiavelli, P.Fallon, M.Albers, V.M.Bader, D.Bazin, C.M.Campbell, R.M.Clark, M.Cromaz, J.Dilling, A.Gade, A.Gallant, J.D.Holt, R.V.F.Janssens, R.Krucken, C.Langer, T.Lauritsen, I.Y.Lee, J.Menendez, S.Noji, S.Paschalis, F.Recchia, J.Rissanen, A.Schwenk, M.Scott, J.Simonis, S.R.Stroberg, J.A.Tostevin, C.Walz, D.Weisshaar, A.Wiens, K.Wimmer, S.Zhu

Unexpected distribution of ν1f7/2 strength in 49Ca

NUCLEAR REACTIONS 9Be(48Ca, 47Ca), (50Ca, 49Ca), E not given, [secondary 48,50Ca beams from 9Be(82Se, X), E=140 MeV/nucleon primary reaction, and using A1900 fragment separator at NSCL-MSU]; measured reaction 1n-knockout products using S800 magnetic spectrograph, Eγ, Iγ, γγ-coin, γ(particle) correlated events, using GRETINA array for γ detection, σ(-1n), parallel momentum distributions. 47,49Ca; deduced levels, J, π, l-transfer, γ-ray yields by fitting the data with GEANT4 simulation, spectroscopic factors, configurations, spectroscopic strengths for the 1f7/2 neutron hole states. Comparison with shell-model calculations based on NN+3N force in ν(pf) model space, GXPF1 interaction, and NN+3N including the ν1g9/2 orbital.

doi: 10.1103/PhysRevC.95.064317
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2017GA25      Phys.Rev. C 96, 044329 (2017)

A.B.Garnsworthy, M.Bowry, B.Olaizola, J.D.Holt, S.R.Stroberg, S.Cruz, S.Georges, G.Hackman, A.D.MacLean, J.Measures, H.P.Patel, C.J.Pearson, C.E.Svensson

Spectroscopy of 50Sc and ab initio calculations of B(M3) strengths

RADIOACTIVITY 50Ca(β-)[from Ta(p, X), E=500 MeV at TRIUMF-ISAC facility]; measured Eγ, Iγ, γγ-coin, γγ(θ), level half-lives by γγ(t) using GRIFFIN array of clover HPGe detectors, LaBr3(Ce) scintillators for fast timing, and plastic scintillator array SCEPTAR for β particles. 50Sc; deduced levels, J, π, γ-ray branching ratios, B(M3), B(M1), B(E2), mixing ratio, single-particle-orbital occupation numbers. Comparison with theoretical transition strengths from standard operators and from wave functions produced with the KB3G-pf shell interaction and the valence-space in-medium similarity renormalization group (VS-IMSRG). Comparison of experimental and theoretical B(M3) for transitions in 24Na, 24Al, 34,38Cl, 38K and 50Sc, the theoretical values from ab initio calculations using the VS-IMSRG approach with consistently derived effective Hamiltonians and effective M3 operator.

doi: 10.1103/PhysRevC.96.044329
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2017JI09      Phys.Rev. C 96, 054310 (2017)

C.F.Jiao, J.Engel, J.D.Holt

Neutrinoless double-β decay matrix elements in large shell-model spaces with the generator-coordinate method

RADIOACTIVITY 48Ca, 76Ge, 82Se(2β-); calculated matrix elements for 0νββ decay mode using generator-coordinate method (GCM) with realistic shell-model interactions. Comparison with shell-model calculations.

NUCLEAR STRUCTURE 48Ca, 76Ge, 82Se; calculated projected potential-energy surfaces in (β2, γ) plane, low-lying 0+ and 2+ levels, occupancies of valence neutron and proton orbits using generator-coordinate method (GCM) with realistic shell-model interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.96.054310
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2017LA16      Phys.Rev. C 96, 044323 (2017)

D.Lascar, R.Klawitter, C.Babcock, E.Leistenschneider, S.R.Stroberg, B.R.Barquest, A.Finlay, M.Foster, A.T.Gallant, P.Hunt, J.Kelly, B.Kootte, Y.Lan, S.F.Paul, M.L.Phan, M.P.Reiter, B.Schultz, D.Short, J.Simonis, C.Andreoiu, M.Brodeur, I.Dillmann, G.Gwinner, J.D.Holt, A.A.Kwiatkowski, K.G.Leach, J.Dilling

Precision mass measurements of 125-127Cd isotopes and isomers approaching the N=82 closed shell

ATOMIC MASSES 125,125m,126,127,127mCd, 133Cs; measured TOF ion cyclotron resonances, cyclotron frequencies using TITAN-ISOLTRAP-TRIUMF facility; deduced mass excesses. Comparison with AME-2012 evaluated data, and ab initio shell-model calculations using NUSHELLX code, and with IMSRG calculations. The Cd isotopes produced in U(p, F), E=500 MeV protons using uranium carbide target and Ion Guide Laser Ion Source (IG-LIS) at ISAC-TRIUMF facility.

doi: 10.1103/PhysRevC.96.044323
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2017RE10      Phys.Rev. C 96, 052501 (2017)

M.P.Reiter, K.G.Leach, O.M.Drozdowski, S.R.Stroberg, J.D.Holt, C.Andreoiu, C.Babcock, B.Barquest, M.Brodeur, A.Finlay, M.Foster, A.T.Gallant, G.Gwinner, R.Klawitter, B.Kootte, A.A.Kwiatkowski, Y.Lan, D.Lascar, E.Leistenschneider, A.Lennarz, S.Paul, R.Steinbrugge, R.I.Thompson, M.Wieser, J.Dilling

High-precision QEC-value measurement of the superallowed β+ emitter 22Mg and an ab initio evaluation of the A=22 isobaric triplet

ATOMIC MASSES 22Mg; measured time-of-flight quadrupole-excitation and Ramsey-excitation resonance spectra using Ion Trap for Atomic and Nuclear Science (TITAN) at TRIUMF; deduced average frequency ratios for the mass measurements. 22Mg, 22Na; deduced mass excesses and Q value for ϵ decay of 22Mg decay to 22Na. Comparison with AME-2016 and Hardy-Towner evaluations. 22Mg, 22Ne, 22Na; deduced new coefficients of the IMME by using state-of-the-art ab initio shell-model calculations of the IAS energies. Relevance to isospin-symmetry-breaking (ISB) correction in superallowed β decays.

doi: 10.1103/PhysRevC.96.052501
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2017SI17      Phys.Rev. C 96, 014303 (2017)

J.Simonis, S.R.Stroberg, K.Hebeler, J.D.Holt, A.Schwenk

Saturation with chiral interactions and consequences for finite nuclei

NUCLEAR STRUCTURE 40,54Ca, 56,78Ni; calculated ground-state energies and charge radii using the closed-shell IM-SRG, and compared with evaluated experimental data. 4He, 16,22,24O, 36,40,48,52,54,60Ca, 48,56,68,78Ni; calculated binding energies and charge radii using the IM-SRG for the four Hamiltonians, and compared with evaluated data. 19,20,21,22,23,24,25,26,27,28,29,30,31,32Na, 28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45S, 40,41,42,43,44,45,46,47,48,49,50,51,52,53,54Ca, 48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64Mn, 53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72Ni; calculated ground-state energies and S(2n), charge radii of Mn isotopes, first excited 2+ states of Ca, S and Ni isotopes using the VS-IM-SRG, and compared with experimental data. Calculations used ab initio in-medium similarity renormalization group (IM-SRG) method, and valence-space (VS) IM-SRG for charge radii.

doi: 10.1103/PhysRevC.96.014303
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2017ST03      Phys.Rev.Lett. 118, 032502 (2017)

S.R.Stroberg, A.Calci, H.Hergert, J.D.Holt, S.K.Bogner, R.Roth, A.Schwenk

Nucleus-Dependent Valence-Space Approach to Nuclear Structure

NUCLEAR STRUCTURE 16,18,22O, 10B, 22Na, 46V, C, N, O, Na, Ca, Ni; calculated ground-state energies, J, π, the extension of ab initio nuclear structure calculations.

doi: 10.1103/PhysRevLett.118.032502
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2017ST22      Phys.Rev. C 96, 064310 (2017)

D.Steppenbeck, S.Takeuchi, N.Aoi, P.Doornenbal, M.Matsushita, H.Wang, H.Baba, S.Go, J.D.Holt, J.Lee, K.Matsui, S.Michimasa, T.Motobayashi, D.Nishimura, T.Otsuka, H.Sakurai, Y.Shiga, P.-A.Soderstrom, S.R.Stroberg, T.Sumikama, R.Taniuchi, J.A.Tostevin, Y.Utsuno, J.J.Valiente-Dobon, K.Yoneda

Structure of 55Sc and development of the N=34 subshell closure

NUCLEAR REACTIONS 9Be(56Ti, 55Sc), (55Sc, 55Sc'), E=200 MeV/nucleon, ; [secondary 56Ti and 55Sc beams from primary 70Zn beam and using BigRIPS for fragment identification at RIBF-RIKEN facility]; measured Eγ, Iγ, γγ-coin using DALI2 array of scintillation detectors for γ radiation, and ZeroDegree spectrometer for reaction products. 55Sc; deduced levels. Comparison with large-scale shell-model calculations in sdpf model space, and with ab initio shell-model calculations from the in-medium similarity renormalization group.

NUCLEAR STRUCTURE 55Sc; calculated levels, J, π, σ, spectroscopic factors for one-proton removal reaction; discussed configurations. Large-scale shell-model with SDPF-MUr effective interaction, and ab initio many-body method with the valence-space formulation of the in-medium similarity renormalization group (VS-IM-SRG). Comparison with experimental data, and proton-removal reaction treated with the eikonal model.

doi: 10.1103/PhysRevC.96.064310
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2016GA34      Nat.Phys. 12, 594 (2016)

R.F.Garcia Ruiz, M.L.Bissell, K.Blaum, A.Ekstrom, N.Frommgen, G.Hagen, M.Hammen, K.Hebeler, J.D.Holt, G.R.Jansen, M.Kowalska, K.Kreim, W.Nazarewicz, R.Neugart, G.Neyens, W.Nortershauser, T.Papenbrock, J.Papuga, A.Schwenk, J.Simonis, K.A.Wendt, D.T.Yordanov

Unexpectedly large charge radii of neutron-rich calcium isotopes

NUCLEAR REACTIONS U(p, X)43Ca/44Ca/45Ca/46Ca/47Ca/48Ca/49Ca/50Ca/51Ca/52Ca, E=1.4GeV; measured hyperfine structure spectra; deduced charge radii. Comparison with available data.

doi: 10.1038/nphys3645
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2016LA16      Phys.Rev.Lett. 117, 052501 (2016)

V.Lapoux, V.Soma, C.Barbieri, H.Hergert, J.D.Holt, S.R.Stroberg

Radii and Binding Energies in Oxygen Isotopes: A Challenge for Nuclear Forces

NUCLEAR STRUCTURE 14,15,16,17,18,19,20,21,22,23,24O; analyzed available data; calculated proton and neutron radii, binding energies. ab initio calculations with conventional nuclear interactions derived within chiral effective field theory.

doi: 10.1103/PhysRevLett.117.052501
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2016LE10      Phys.Rev. C 94, 011304 (2016)

K.G.Leach, P.E.Garrett, G.C.Ball, P.C.Bender, V.Bildstein, B.A.Brown, C.Burbadge, T.Faestermann, B.Hadinia, J.D.Holt, A.T.Laffoley, D.S.Jamieson, B.Jigmeddorj, A.J.Radich, E.T.Rand, S.R.Stroberg, C.E.Svensson, I.S.Towner, H.-F.Wirth

Searching for 0+ states in 50Cr: Implications for the superallowed β decay of 50Mn

NUCLEAR REACTIONS 52Cr(p, t), E=24 MeV; measured E(t), I(t), σ(θ) using Q3D magnetic spectrograph at MLL-Munich. 50Cr; deduced levels, J, π, L-transfers, 0+ states. Coupled-channel, finite-range DWBA analysis using software FRESCO code. Comparison with ab initio shell-model predictions using in-medium similarity renormalization group (IM-SRG) formalism based on NN and 3N forces from chiral-energy density functionals (EFT).Comparison with previous experimental results and evaluated data in the ENSDF database.

RADIOACTIVITY 50Mn(EC); discussed possible Fermi non-analog β transitions to 0+ states at 3895 and 4069 keV assigned in authors' (p, t) work.

doi: 10.1103/PhysRevC.94.011304
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2016SI02      Phys.Rev. C 93, 011302 (2016)

J.Simonis, K.Hebeler, J.D.Holt, J.Menendez, A.Schwenk

Exploring sd-shell nuclei from two- and three-nucleon interactions with realistic saturation properties

NUCLEAR STRUCTURE 18,19,20,21,22,23,24,25,26,27,28O, 19,20,21,22,23,24,25,26,27,28,29F, 20,21,22,23,24,25,26,27,28,29,30Ne, 21,22,23,24,25,26,27,28,29,30,31Na, 22,23,24,25,26,27,28,29,30,31,32Mg, 23,24,25,26,27,28,29,30,31,32,33Al, 24,25,26,27,28,29,30,31,32,33,34Si, 25,26,27,28,29,30,31,32,33,34,35P, 26,27,28,29,30,31,32,33,34,35,36S, 27,28,29,30,31,32,33,34,35,36,37Cl, 28,29,30,31,32,33,34,35,36,37,38Ar, 29,30,31,32,33,34,35,36,37,38,39K, 30,31,32,33,34,35,36,37,38,39,40Ca; calculated S(2n), S(2p), energies of first 2+ states in even-even nuclei, and theoretical uncertainty estimates from variation of the resolution scale, the low-energy couplings, and from the many-body method. 22,23,24,25,26,27,28,29,30,31,32Mg, 27,28,29,30,31,32,33,34,35,36,37Cl; calculated ground-state energies relative to that of 16O, and theoretical uncertainties. Comparison to AME-12 data.

doi: 10.1103/PhysRevC.93.011302
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2016ST12      Phys.Rev. C 93, 051301 (2016)

S.R.Stroberg, H.Hergert, J.D.Holt, S.K.Bogner, A.Schwenk

Ground and excited states of doubly open-shell nuclei from ab initio valence-space Hamiltonians

NUCLEAR STRUCTURE 19,23,25,26F, 20,22,24,25,26Ne, 24Mg; calculated levels, J, π, yrast states from ab initio in-medium similarity renormalization group (IM-SRG) Hamiltonians based on NN+3N-induced and NN+3N-full Hamiltonians. Comparison with experimental data, and with phenomenological USDB predictions. 17,18,19,20,21,22,23,24,25,26,27,28,29F, 18,19,20,21,22,23,24,25,26,27,28,29,30Ne; calculated ground-state energies from the A-dependent IM-SRG valence-space Hamiltonian. Comparison with AME-2012 values, and the phenomenological USDB interaction.

doi: 10.1103/PhysRevC.93.051301
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2015CA09      Phys.Rev. C 92, 014327 (2015)

L.Caceres, A.Lepailleur, O.Sorlin, M.Stanoiu, D.Sohler, Zs.Dombradi, S.K.Bogner, B.A.Brown, H.Hergert, J.D.Holt, A.Schwenk, F.Azaiez, B.Bastin, C.Borcea, R.Borcea, C.Bourgeois, Z.Elekes, Zs.Fulop, S.Grevy, L.Gaudefroy, G.F.Grinyer, D.Guillemaud-Mueller, F.Ibrahim, A.Kerek, A.Krasznahorkay, M.Lewitowicz, S.M.Lukyanov, J.Mrazek, F.Negoita, F.de Oliveira, Yu.-E.Penionzhkevich, Zs.Podolyak, M.G.Porquet, F.Rotaru, P.Roussel-Chomaz, M.G.Saint-Laurent, H.Savajols, G.Sletten, J.C.Thomas, J.Timar, C.Timis, Zs.Vajta

Nuclear structure studies of 24F

NUCLEAR REACTIONS 9Be(36S, X)24O/26F/27Ne/28Ne/29Na/30Na, E=77.6 MeV/nucleon; measured energy loss, TOF, yields using LISE achromatic spectrometer at GANIL facility. C(27Na, 24F), E=54-65 MeV/nucleon, [secondary cocktail beam of 25,26Ne, 27,28Na, 29,30Mg from C(36S, X), E=77.6 MeV/nucleon primary reaction, and separated using ALPHA and SPEG spectrometers]; measured Eγ, Iγ, (particle)γ-, γγ-coin using Chateau de Cristal array. 24F; deduced levels, J, π, branching ratios, configurations. Comparison with shell-model calculations using USDA and USDB interactions, and ab initio shell-model calculations, using interactions derived from chiral NN+3N forces by means of IM-SRG.

RADIOACTIVITY 24O(β-), (β-n)[from Be(36S, X), E=77.6 MeV/nucleon using LISE spectrometer at GANIL]; measured Eγ, Iγ, Eβ, βγ-, γγ-coin, (24O)β-correlations, half-life of 24O isotope from (24O)γ-correlated decay curve, β-delayed neutron emission probability Pn using four segmented Ge clover detectors of EXOGAM array for γ rays and DSSSDs for particles. 24F; deduced levels, J, π, branching ratios, β feedings, logft. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.92.014327
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2015DU11      Phys.Rev. C 92, 034313 (2015)

T.Duguet, H.Hergert, J.D.Holt, V.Soma

Nonobservable nature of the nuclear shell structure: Meaning, illustrations, and consequences

NUCLEAR STRUCTURE 40,42,44,46,48,50,52,54,56,58,60Ca; calculated effective single-particle energies (ESPEs), energies of first 2+ states using Shell model. 22,24O; calculated Fermi gap in the ESPE spectrum and the first 2+ excitation energy using microscopic shell model based on realistic 2N and 3N interactions. 74Ni; calculated spectral strength distribution for one-neutron addition and removal processes, ESPEs using self-consistent Gorkov Green's function with a realistic 2N chiral interaction. 14,16,18,20,22,24O; calculated binding energies, S(n) with dominant spectroscopic factors versus neutron ESPEs, residual spreads of separation energies and ESPEs, two-nucleon shell gap versus ESPE Fermi gap, spectroscopic factors associated with one neutron addition and removal process on the ground states. State-of-the-art multireference in-medium SRG and self-consistent Gorkov Green's function many-body calculations based on chiral two- and three-nucleon interactions to illustrate nonobservable aspects of the one-nucleon shell structure.

doi: 10.1103/PhysRevC.92.034313
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2015RU02      Phys.Rev. C 91, 041304 (2015)

R.F.Garcia Ruiz, M.L.Bissell, K.Blaum, N.Frommgen, M.Hammen, J.D.Holt, M.Kowalska, K.Kreim, J.Menendez, R.Neugart, G.Neyens, W.Nortershauser, F.Nowacki, J.Papuga, A.Poves, A.Schwenk, J.Simonis, D.T.Yordanov

Ground-state electromagnetic moments of calcium isotopes

NUCLEAR MOMENTS 43,45,47,49,51Ca; measured hyperfine spectra, hyperfine structure constants, J, g factors, magnetic and quadrupole moments using collinear laser spectroscopy (COLLAPS) and radiofrequency quadrupole (RFQ) beam cooler ISCOOL at ISOLDE-CERN facility. Comparison with theoretical predictions using KB3G, GXPF1A, SDPF.SM and three-nucleon forces (NN+3N). Ca beams produced in bombardment of uranium carbide target with 1.4-GeV protons at ISOLDE-CERN.

doi: 10.1103/PhysRevC.91.041304
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2014BO25      Phys.Rev.Lett. 113, 142501 (2014)

S.K.Bogner, H.Hergert, J.D.Holt, A.Schwenk, S.Binder, A.Calci, J.Langhammer, R.Roth

Nonperturbative Shell-Model Interactions from the In-Medium Similarity Renormalization Group

NUCLEAR STRUCTURE 21,22,23,24,25,26O; calculated energy levels, J, π. Comparison with experimental data.

doi: 10.1103/PhysRevLett.113.142501
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2014GA20      Phys.Rev.Lett. 113, 082501 (2014)

A.T.Gallant, M.Brodeur, C.Andreoiu, A.Bader, A.Chaudhuri, U.Chowdhury, A.Grossheim, R.Klawitter, A.A.Kwiatkowski, K.G.Leach, A.Lennarz, T.D.Macdonald, B.E.Schultz, J.Lassen, H.Heggen, S.Raeder, A.Teigelhofer, B.A.Brown, A.Magilligan, J.D.Holt, J.Menendez, J.Simonis, A.Schwenk, J.Dilling

Breakdown of the Isobaric Multiplet Mass Equation for the A=20 and 21 Multiplets

ATOMIC MASSES 20,21Mg; measured time-of-flight ion cyclotron resonance; deduced masses. Comparison with shell model calculations, AME2012 mass evaluation.

doi: 10.1103/PhysRevLett.113.082501
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2014HO12      Phys.Rev. C 90, 024312 (2014)

J.D.Holt, J.Menendez, J.Simonis, A.Schwenk

Three-nucleon forces and spectroscopy of neutron-rich calcium isotopes

NUCLEAR STRUCTURE 40,41,42,43,44,45,46,47,48,49,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70Ca; calculated ground-state energies in pf and pfg9/2 shells, convergence of 42Ca and 48Ca ground-state energies as a function of increasing intermediate-state excitations; calculated levels, J, π, B(E2), B(M1) for 43,44,45,46,47,48,49,51,52,53,54,55,56,57Ca, energy convergence. Chiral two- and three-nucleon (NN and 3N) interactions, and many-body perturbation theory (MBPT). Comparison with coupled-cluster calculations, and with available experimental data for A=43-57 Ca isotopes.

doi: 10.1103/PhysRevC.90.024312
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2014KW04      Phys.Rev. C 89, 045502 (2014)

A.A.Kwiatkowski, T.Brunner, J.D.Holt, A.Chaudhuri, U.Chowdhury, M.Eibach, J.Engel, A.T.Gallant, A.Grossheim, M.Horoi, A.Lennarz, T.D.Macdonald, M.R.Pearson, B.E.Schultz, M.C.Simon, R.A.Senkov, V.V.Simon, K.Zuber, J.Dilling

New determination of double-β-decay properties on 48Ca High-precision Qββ-value measurement and improved nuclear matrix element calculations

ATOMIC MASSES 48Ca, 48Ti; measured cyclotron-frequencies, resonances using TITAN system consisting of radio frequency quadrupole (RFQ) beam cooler and buncher, an electron beam ion trap (EBIT), and a Penning trap (MPET) at ISAC-TRIUMF facility; deduced Q value for double β decay of 48Ti. Comparison with previous measurements and atomic mass evaluations (AME-2003 and AME-2012).

RADIOACTIVITY 48Ca(2β-); measured precise Q-value using TITAN system at ISAC-TRIUMF facility; calculated ββ nuclear matrix element by including effects of levels outside the valence space in a shell-model; discussed case for a new experiment on double-beta decay of 48Ca.

doi: 10.1103/PhysRevC.89.045502
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2013HO01      Phys.Rev.Lett. 110, 022502 (2013)

J.D.Holt, J.Menendez, A.Schwenk

Three-Body Forces and Proton-Rich Nuclei

NUCLEAR STRUCTURE 18Ne, 19Na, 20Mg, 21Al, 22Si; calculated excitation energies, J, π, ground-state energy, one- and two-proton separation energies. Three-nucleon forces, comparison with AME2011, isobaric multiplet mass equation (IMME) IMME data.

doi: 10.1103/PhysRevLett.110.022502
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2013HO07      Eur.Phys.J. A 49, 39 (2013)

J.D.Holt, J.Menendez, A.Schwenk

Chiral three-nucleon forces and bound excited states in neutron-rich oxygen isotopes

NUCLEAR STRUCTURE 21,22,23O; calculated low-lying levels, J, π using chiral two- and three-nucleon interactions. Compared with data and with other calculations.

doi: 10.1140/epja/i2013-13039-2
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2013HO12      Phys.Rev. C 87, 064315 (2013)

J.D.Holt, J.Engel

Effective double-β-decay operator for 76Ge and 82Se

RADIOACTIVITY 76Ge, 82Se(2β-); calculated shell model two-body 0νββ and 2νββ decay nuclear matrix elements. Diagrammatic many-body perturbation theory (MBPT) in combination with chiral effective field theory (EFT).

doi: 10.1103/PhysRevC.87.064315
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2013LI01      Phys.Rev.Lett. 110, 012501 (2013)

D.L.Lincoln, J.D.Holt, G.Bollen, M.Brodeur, S.Bustabad, J.Engel, S.J.Novario, M.Redshaw, R.Ringle, S.Schwarz

First Direct Double-β Decay Q-Value Measurement of 82Se in Support of Understanding the Nature of the Neutrino

ATOMIC MASSES 82Kr, 82Se; measured time-of-flight cyclotron resonance , cyclotron resonance frequency; deduced Q-value. Penning trap measurement.

doi: 10.1103/PhysRevLett.110.012501
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2013WI06      Nature(London) 498, 346 (2013), Erratum Nature(London) 498, 346 (2013)

F.Wienholtz, D.Beck, K.Blaum, Ch.Borgmann, M.Breitenfeldt, R.B.Cakirli, S.George, F.Herfurth, J.D.Holt, M.Kowalska, S.Kreim, D.Lunney, V.Manea, J.Menendez, D.Neidherr, M.Rosenbusch, L.Schweikhard, A.Schwenk, J.Simonis, J.Stanja, K.Zuber

Masses of exotic calcium isotopes pin down nuclear forces

ATOMIC MASSES 51,52,53,54Ca; measured TOF, ion cyclotron resonance frequency ratio; deduced masses. ISOLTRAP high-resolution Penning trap, shell-model calculations with KB3G and GXPF1A interactions.

doi: 10.1038/nature12226
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2012GA29      Phys.Rev.Lett. 109, 032506 (2012)

A.T.Gallant, J.C.Bale, T.Brunner, U.Chowdhury, S.Ettenauer, A.Lennarz, D.Robertson, V.V.Simon, A.Chaudhuri, J.D.Holt, A.A.Kwiatkowski, E.Mane, J.Menendez, B.E.Schultz, M.C.Simon, C.Andreoiu, P.Delheij, M.R.Pearson, H.Savajols, A.Schwenk, J.Dilling

New Precision Mass Measurements of Neutron-Rich Calcium and Potassium Isotopes and Three-Nucleon Forces

ATOMIC MASSES 51,52Ca, 51K; measured TOF-ICR resonances, average frequency ratios; deduced masses. Comparison with available data. TRIUMF TITAN trap, comparison with available data, KB3G and GXPF1A effective interactions.

doi: 10.1103/PhysRevLett.109.032506
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2010OR01      Phys.Rev. C 82, 044317 (2010)

J.N.Orce, J.D.Holt, A.Linnemann, C.J.McKay, C.Fransen, J.Jolie, T.T.S.Kuo, S.R.Lesher, M.T.McEllistrem, N.Pietralla, N.Warr, V.Werner, S.W.Yates

Fermionic-bosonic couplings in a weakly deformed odd-mass nucleus, 9341Nb

NUCLEAR REACTIONS 93Nb(n, n'γ), E=1.5-3 MeV; 94Zr(p, 2nγ), E=11.5-19 MeV; measured Eγ, Iγ, γγ-coin, γ(θ), γγ(θ), level half-lives by DSAM. 93Nb; deduced levels, J, π, multipolarity, mixing ratios, configurations, B(M1), B(E2), One-phonon isoscalar and isovector excitations. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.82.044317
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2010OT03      Phys.Rev.Lett. 105, 032501 (2010)

T.Otsuka, T.Suzuki, J.D.Holt, A.Schwenk, Y.Akaishi

Three-Body Forces and the Limit of Oxygen Isotopes

NUCLEAR STRUCTURE 16,17,18,19,20,21,22,23,24,25,26,27,28O; calculated single-particle and ground-state energies; deduced explanation of oxygen anomaly based on three-nucleon forces.

doi: 10.1103/PhysRevLett.105.032501
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2009PI01      Phys.Rev. C 79, 015501 (2009)

J.R.A.Pitcairn, D.Roberge, A.Gorelov, D.Ashery, O.Aviv, J.A.Behr, P.G.Bricault, M.Dombsky, J.D.Holt, K.P.Jackson, B.Lee, M.R.Pearson, A.Gaudin, B.Dej, C.Hohr, G.Gwinner, D.Melconian

Tensor interaction constraints from β-decay recoil spin asymmetry of trapped atoms

RADIOACTIVITY 80Rb(β+); measured daughter nucleus recoil angular distributions, recoil asymmetry; deduced tensor interaction constraints. Spin-polarized nucleus. Comparison with standard model predictions.

doi: 10.1103/PhysRevC.79.015501
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2008HO01      Phys.Rev.Lett. 100, 062501 (2008)

J.W.Holt, G.E.Brown, T.T.S.Kuo, J.D.Holt, R.Machleidt

Shell Model Description of the 14C Dating β Decay with Brown-Rho-Scaled NN Interactions

RADIOACTIVITY 14C(β-); calculated Gamow-Teller matrix elements and β-decay half life using the shell model and medium modified Bonn-B potential.

doi: 10.1103/PhysRevLett.100.062501
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2008WE07      Phys.Rev. C 78, 031301 (2008)

V.Werner, N.Benczer-Koller, G.Kumbartzki, J.D.Holt, P.Boutachkov, E.Stefanova, M.Perry, N.Pietralla, H.Ai, K.Aleksandrova, G.Anderson, R.B.Cakirli, R.J.Casperson, R.F.Casten, M.Chamberlain, C.Copos, B.Darakchieva, S.Eckel, M.Evtimova, C.R.Fitzpatrick, A.B.Garnsworthy, G.Gurdal, A.Heinz, D.Kovacheva, C.Lambie-Hanson, X.Liang, P.Manchev, E.A.McCutchan, D.A.Meyer, J.Qian, A.Schmidt, N.J.Thompson, E.Williams, R.Winkler

Evidence for the microscopic formation of mixed-symmetry states from magnetic moment measurements

NUCLEAR REACTIONS C(92Zr, 92Zr'), (94Zr, 94Zr'), E=275 MeV; measured Eγ, Iγ, (particle)γ-coin. Comparison with shell model and quasiparticle phonon model calculations.

NUCLEAR MOMENTS C(92Zr, 92Zr'), (94Zr, 94Zr'), E=275 MeV; 92,94Zr; measured g factors. Transient field technique.

doi: 10.1103/PhysRevC.78.031301
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2007BU23      Phys.Rev.Lett. 99, 092503 (2007)

O.Burda, N.Botha, J.Carter, R.W.Fearick, S.V.Fortsch, C.Fransen, H.Fujita, J.D.Holt, M.Kuhar, A.Lenhardt, P.von Neumann-Cosel, R.Neveling, N.Pietralla, V.Yu.Ponomarev, A.Richter, O.Scholten, E.Sideras-Haddad, F.D.Smit, J.Wambach

High-Energy-Resolution Inelastic Electron and Proton Scattering and the multiphonon Nature of Mixed-Symmetry 2+ States in 94Mo

NUCLEAR REACTIONS 94Mo(e, e'), E=70 MeV; 94Mo(p, p'), E=200 MeV; measured σ and excitation strengths. Compared results to model calculations.

doi: 10.1103/PhysRevLett.99.092503
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2007HO17      Phys.Rev. C 76, 034325 (2007)

J.D.Holt, N.Pietralla, J.W.Holt, T.T.S.Kuo, G.Rainovski

Microscopic restoration of proton-neutron mixed symmetry in weakly collective nuclei

NUCLEAR STRUCTURE 92Zr, 94Mo, 96Ru, 98Pd, 100Cd; calculated B(M1) and g-factors using the shell model and the microscopic low-momentum nucleon-nucleon interaction.

doi: 10.1103/PhysRevC.76.034325
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2006OR09      Phys.Rev.Lett. 97, 062504 (2006)

J.N.Orce, J.D.Holt, A.Linnemann, C.J.McKay, S.R.Lesher, C.Fransen, J.W.Holt, A.Kumar, N.Warr, V.Werner, J.Jolie, T.T.S.Kuo, M.T.McEllistrem, N.Pietralla, S.W.Yates

Identification of Mixed-Symmetry States in an Odd-Mass Nearly Spherical Nucleus

NUCLEAR REACTIONS 93Nb(n, n'), E=1.5-3 MeV; 94Zr(p, 2n), E=11.5-19 MeV; measured Eγ, Iγ, γγ-coin, DSA. 93Nb deduced levels J, π, configurations, T1/2, B(M1), B(E2). Comparison with shell model predictions.

doi: 10.1103/PhysRevLett.97.062504
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2005HO29      Phys.Rev. C 72, 041304 (2005)

J.D.Holt, J.W.Holt, T.T.S.Kuo, G.E.Brown, S.K.Bogner

Low momentum shell model effective interactions with all-order core polarizations

NUCLEAR STRUCTURE 18O, 18F; calculated levels, J, π. All-order summation of core-polarization diagrams.

doi: 10.1103/PhysRevC.72.041304
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2004HO05      Nucl.Phys. A733, 153 (2004)

J.D.Holt, T.T.Kuo, G.E.Brown, S.K.Bogner

Counter terms for low momentum nucleon-nucleon interactions

doi: 10.1016/j.nuclphysa.2003.12.004
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2004HO07      Phys.Rev. C 69, 034329 (2004)

J.D.Holt, T.T.S.Kuo, G.E.Brown

Family of Hermitian low-momentum nucleon interactions with phase shift equivalence

NUCLEAR STRUCTURE 2H; calculated wave functions, phase shifts. Hermitian low-momentum nucleon interactions.

doi: 10.1103/PhysRevC.69.034329
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