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NSR database version of April 11, 2024.

Search: Author = M.Spieker

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2024CO04      Nucl.Instrum.Methods Phys.Res. A1058, 168827 (2024)

A.L.Conley, B.Kelly, M.Spieker, R.Aggarwal, S.Ajayi, L.T.Baby, S.Baker, C.Benetti, I.Conroy, P.D.Cottle, I.B.D'Amato, P.DeRosa, J.Esparza, S.Genty, K.Hanselman, I.Hay, M.Heinze, D.Houlihan, M.I.Khawaja, P.S.Kielb, A.N.Kuchera, G.W.McCann, A.B.Morelock, E.Lopez-Saavedra, R.Renom, L.A.Riley, G.Ryan, A.Sandrik, V.Sitaraman, E.Temanson, M.Wheeler, C.Wibisono, I.Wiedenhover

The CeBrA demonstrator for particle-γ coincidence experiments at the FSU Super-Enge Split-Pole Spectrograph

NUCLEAR REACTIONS 49Ti, 61Ni, 52Cr, 34S(d, p), E=16 MeV; measured reaction products, Eγ, Iγ, particle-γ-coin.; deduced γ-ray energies and relative intensities, excited states lifetimes. Comparison with available data. The CeBrA demonstrator for particle-γ coincidence experiments at the Super-Enge Split-Pole Spectrograph of the John D. Fox Superconducting Linear Accelerator Laboratory at Florida State University.

doi: 10.1016/j.nima.2023.168827
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2024HA06      Phys.Rev. C 109, 024302 (2024)

I.C.S.Hay, P.D.Cottle, L.A.Riley, L.T.Baby, S.Baker, A.L.Conley, J.Esparza, K.Hanselman, M.Heinze, D.Houlihan, B.Kelly, K.W.Kemper, G.W.McCann, R.Renom, A.Sandrik, D.Simms, M.Spieker, I.Wiedenhover

Measurement of g9/2 strength in the stretched 8- state and other negative parity states via the 51V(d, p)52V reaction

doi: 10.1103/PhysRevC.109.024302
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2024SP01      Phys.Rev. C 109, 014307 (2024)

M.Spieker, D.Bazin, S.Biswas, P.D.Cottle, P.J.Farris, A.Gade, T.Ginter, S.Giraud, K.W.Kemper, J.Li, S.Noji, J.Pereira, L.A.Riley, M.K.Smith, D.Weisshaar, R.G.T.Zegers

Proton removal from 73, 75Br to 72, 74Se at intermediate energies

doi: 10.1103/PhysRevC.109.014307
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2023DE27      Eur.Phys.J. A 59, 198 (2023)

J.Deary, M.Scheck, R.Schwengner, D.O'Donnell, D.Bemmerer, R.Beyer, Th.Hensel, A.R.Junghans, T.Kogler, S.E.Muller, K.Romer, K.Schmidt, S.Turkat, S.Urlass, A.Wagner, M.Bowry, P.Adsley, O.Agar, R.Chapman, F.C.L.Crespi, D.T.Doherty, U.Friman-Gayer, R.-D.Herzberg, J.Isaak, R.V.F.Janssens, T.Kroll, B.Loher, B.S.Nara Singh, P.von Neumann-Cosel, L.Pellegri, E.E.Peters, G.Rainovski, D.Savran, J.F.Smith, M.Spieker, P.G.Thirolf, S.Triambak, W.Tornow, M.Venhart, M.Wiedeking, O.Wieland, S.W.Yates, A.Zilges

Photo-response of the N = Z nucleus 24Mg

NUCLEAR REACTIONS 24Mg(γ, γ'), E<13 MeV; measured reaction products, Eγ, Iγ; deduced energy-integrated scattering σ, B(M1), B(E1). Comparison with available data. The ELBE accelerator of the Helmholtz-Zentrum Dresden-Rossendorf.

doi: 10.1140/epja/s10050-023-01111-7
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2023HA31      Phys.Rev. C 108, 034608 (2023)

K.Haak, O.B.Tarasov, P.Chowdhury, A.M.Rogers, K.Sharma, T.Baumann, D.Bazin, P.C.Bender, J.Chen, A.Estrade, M.A.Famiano, D.C.Foulds-Holt, N.Fukuda, A.Gade, T.N.Ginter, R.W.Gohier, M.Hausmann, A.M.Hill, D.E.M.Hoff, L.Klankowski, E.Kwan, J.Li, S.N.Liddick, B.Longfellow, S.Lyons, C.Morse, M.Portillo, D.Rhodes, A.L.Richard, S.Samaranayake, B.M.Sherrill, M.K.Smith, M.Spieker, C.S.Sumithrarachchi, H.Suzuki, K.Wang, S.Waniganeththi, D.Weisshaar, S.Zhu

Production and discovery of neutron-rich isotopes by fragmentation of 198Pt

NUCLEAR REACTIONS 9Be, Ni(198Pt, X)182Yb/183Lu/184Lu/185Lu/186Lu/187Lu/188Lu/189Lu/184Hf/185Hf/186Hf/187Hf/188Hf/189Hf/190Hf/191Hf/192Hf/185Ta/186Ta/187Ta/188Ta/189Ta/190Ta/191Ta/192Ta/193Ta/186W/187W/188W/189W/190W/191W/192W/193W/194W/187Re/188Re/189Re/190Re/191Re/192Re/193Re/194Re/195Re/196Re/190Os/191Os/192Os/193Os/194Os/195Os/196Os/197Os/192Ir/193Ir/194Ir/195Ir/196Ir/197Ir/198Ir, E=85 MeV/nucleon from the NSCL-MSU Coupled Cyclotron Facility (CCF); measured reaction products, particle identification spectra using A1900 fragment separator, S800 spectrograph for fragment analysis, PIN diode telescope of five silicon detectors for particle detection, γ rays using GRETINA array, and LISE+ Monte Carlo calculations of charge state fractions; deduced production cross sections of about 70 nuclei in Z=70-77 region. 189Lu, 191,192Hf; deduced new nuclides. 190W; measured γ-ray spectrum from the emission of a 166-μs isomer. Comparison of measured production cross sections with theoretical calculations using EFAX3 and COFRA codes. Numerical values of production cross sections are listed in the Supplemental Material.

doi: 10.1103/PhysRevC.108.034608
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2023LO02      Phys.Rev. C 107, 014620 (2023)

B.Longfellow, A.Gade, D.Bazin, P.C.Bender, M.Bowry, B.A.Brown, B.Elman, E.Lunderberg, D.Rhodes, M.Spieker, D.Weisshaar, S.J.Williams

Relative population of states in 21Mg from few-nucleon removal reactions

NUCLEAR REACTIONS 9Be(24Mg, X)21Mg, E=95 MeV/nucleon; 9Be(25Al, )21Mg, E=102 MeV/nucleon; 9Be(26Si, X)21Mg, E=95 MeV/nucleon; measured Eγ, Iγ, γγ-coin; deduced parallel momentum distribution of the 21Mg reaction product, correlation between the ratio of the population of levels in 21Mg produced from 26Si to the population of levels in 21Mg produced from 25Al. 9Be(24Mg, X)21Mg, E=95 MeV/nucleon; deduced σ for three-neutron removal. 21Mg; deduced levels, J, π, γ-ray transition relative intensities. 9Be(25Al, X)22Mg, E=67 MeV/nucleon; 9Be(26Si, X)22Mg, E=72 MeV/nucleon; analyzed experimental Eγ, Iγ, from 2008GA10 Phys.Rev. C 77, 044306; deduced parallel momentum distributions for 22Mg reaction product, ratio of the population of levels in 22Mg produced from 26Si to the population of levels in 22Mg produced from 25Al as function of the spin. Observed unexpected strong correlation between the relative population of the states in 21Mg and the spin of the populated level in reactions caused be 25Al and 26Si. Comparison to shell-model calculations using the USDB Hamiltonian. CAESium-iodide scintillator ARray (CAESAR) consisting of 192 CsI(Na) scintillators and S800 magnetic spectrograph at Coupled Cyclotron Facility (NSCL).

doi: 10.1103/PhysRevC.107.014620
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2023RE02      Phys.Lett. B 838, 137704 (2023)

A.Revel, J.Wu, H.Iwasaki, J.Ash, D.Bazin, B.A.Brown, J.Chen, R.Elder, P.Farris, A.Gade, M.Grinder, N.Kobayashi, J.Li, B.Longfellow, T.Mijatovic, J.Pereira, A.Poves, A.Sanchez, N.Shimizu, M.Spieker, Y.Utsuno, D.Weisshaar

Large collectivity in 29Ne at the boundary of the island of inversion

NUCLEAR REACTIONS 181Ta, 9Be(29Ne, 29Ne'), E=101 MeV/nucleon; measured reaction products, Eγ, Iγ. 29Ne; deduced γ-ray energies, partial level scheme, B(E2). Comparison with shell-model calculations using FSU, SDPF-M, SDPF-U-MIX and EEdf1 interactions. The GRETINA array, the TRIPLEX device, the S800 Spectrograph facilitates at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University.

doi: 10.1016/j.physletb.2023.137704
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2023RI03      Phys.Rev. C 108, 044306 (2023)

L.A.Riley, D.T.Simms, L.T.Baby, A.L.Conley, P.D.Cottle, J.Esparza, K.Hanselman, I.C.S.Hay, M.Heinze, B.Kelly, K.W.Kemper, G.W.McCann, R.Renom, M.Spieker, I.Wiedenhover

g9/2 neutron strength in the N=29 isotones and the 52Cr(d, p)53Cr reaction

doi: 10.1103/PhysRevC.108.044306
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2023SP02      Phys.Lett. B 841, 137932 (2023)

M.Spieker, S.E.Agbemava, D.Bazin, S.Biswas, P.D.Cottle, P.J.Farris, A.Gade, T.Ginter, S.Giraud, K.W.Kemper, J.Li, W.Nazarewicz, S.Noji, J.Pereira, L.A.Riley, M.Smith, D.Weisshaar, R.G.T.Zegers

Hexadecapole strength in the rare isotopes 74, 76Kr

NUCLEAR REACTIONS 1H(74Kr, 74Kr'), (76Kr, 76Kr'), E(cm)=100 MeV, [secondary 74,76Kr beams from 9Be(78Kr, X), E=150 MeV/nucleon primary reaction, followed by separation of fragments using A1900 separator]; measured Doppler-corrected Eγ, Iγ, (particle)γ-coin using NSCL-MSU using NSCL/Ursinus Liquid Hydrogen (LH2) Target, eight GRETINA modules of 36-fold segmented HPGe detectors for γ radiation, and S800 spectrograph for projectile-like reaction residues. 74,76Kr; deduced levels, Jπ, β2 for the first 2+ state and β4 and B(E4)(W.u.) for the first 4+ state from inelastic proton scattering experiments in inverse kinematics. Comparison to coupled-channels calculations, and nuclear density functional theory (DFT) calculations using the Skyrme SkM* and UNEDF1 energy density functionals, covariant NL3* and DD-PC1 energy density functionals. Systematics and theoretical predictions of β2, β4 and B(E4)(W.u.) for 74,76,78,80,82,84,86Kr.

doi: 10.1016/j.physletb.2023.137932
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2023SP03      Phys.Rev. C 108, 014311 (2023)

M.Spieker, L.T.Baby, A.L.Conley, B.Kelly, M.Muscher, R.Renom, T.Schuttler, A.Zilges

Experimental study of excited states of 62Ni via one-neutron (d, p) transfer up to the neutron-separation threshold and characteristics of the pygmy dipole resonance states

NUCLEAR REACTIONS 61Ni(d, p), E=16 MeV; measured Ep, Ip, σ(θ) using Super-Enge Split-Pole Spectrograph (SE-SPS) at the Superconducting Linear Accelerator and Super-FN Tandem van-de-Graaff accelerator facilities of Florida State University. 62Ni; deduced levels, L-transfers J, π, configurations, spectroscopic factors, total cross sections. Adiabatic distorted wave approximation (ADWA) analysis using the coupled-channels program CHUCK3 for analysis of angular distributions. Comparison with previous experimental results in the ENSDF database. 62Ni(γ, γ'), E not given; measured Eγ, Iγ, γγ(θ); deduced partial results of the experiment for pygmy dipole resonances (PDR) shown in Fig. 8d of the paper, while detailed results to be published elsewhere.

doi: 10.1103/PhysRevC.108.014311
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2023YA17      Phys.Rev. C 107, 064309 (2023)

D.Yates, R.Krucken, I.Dillmann, P.E.Garrett, B.Olaizola, V.Vedia, F.A.Ali, C.Andreoiu, W.Ashfield, G.C.Ball, Z.Beadle, N.Bernier, S.S.Bhattacharjee, H.Bidaman, V.Bildstein, D.Bishop, M.Bowry, C.Burbadge, R.Caballero-Folch, D.Z.Chaney, D.C.Cross, A.Diaz Varela, M.R.Dunlop, R.Dunlop, L.J.Evitts, F.H.Garcia, A.B.Garnsworthy, S.Georges, S.A.Gillespie, G.Hackman, J.Henderson, B.Jigmeddorj, J.Lassen, R.Li, B.K.Luna, A.D.MacLean, C.R.Natzke, C.M.Petrache, A.J.Radich, M.M.Rajabali, P.H.Regan, Y.Saito, J.Smallcombe, J.K.Smith, M.Spieker, C.E.Svensson, A.Teigelhofer, K.Whitmore, T.Zidar

Decay spectroscopy of 160Eu: Quasiparticle configurations of excited states and structure of Kπ = 4+ bandheads in 160Gd

RADIOACTIVITY 160,160mEu(β-)[from U(p, X), E=480 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ) βγγ-coin; deduced logft, β-feeding intensities. 160Eu; deduced J, π of the b-decaying isomeric states with preliminary J=1 and J=5 assignments, configurations. 160Gd; deduced levels, J, π, transition intensities, δ, B(M1), B(E2), T1/2 of the excited states populated in 160Eu decay, band configurations. Comparison to previous experimental results. GRIFFIN spectrometer consisting of 15 HPGe clover detectors and surrounded by 7 LaBr3(Ce) detectors for lifetime measurements at the TRIUMF-ISAC facility.

doi: 10.1103/PhysRevC.107.064309
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2022GI04      Phys.Rev. C 105, 044321 (2022)

S.A.Gillespie, K.W.Brown, R.J.Charity, L.G.Sobotka, A.K.Anthony, J.Barney, A.Bonaccorso, B.A.Brown, J.Crosby, D.Dell'Aquila, J.Elson, J.Estee, A.Gade, M.Ghazali, G.Jhang, Y.Jin, B.Longfellow, W.G.Lynch, J.Pereira, M.Spieker, S.Sweany, F.C.E.Teh, A.Thomas, M.B.Tsang, C.Y.Tsang, D.Weisshaar, H.Y.Wu, K.Zhu

Proton decay spectroscopy of 28S and 30Cl

NUCLEAR REACTIONS 9Be(29S, n), (31Ar, p), E=150 MeV/nucleon; measured reaction products, Ep, Ip, Eγ, Iγ, (particle)p-coin, pγ-coin; deduced invariant mass, momentum distribution. Setup consisting of S800 spectrograph, Si-CsI(Tl) DSSD array of 128 concentric rings and 128 annular sectors, CAESAR CsI(Na) photon detection array, BC-400-type scintillation fiber detector at A1900 fragment separator (NSCL).

RADIOACTIVITY 28S(p), (2p) [from 9Be(29S, n), E=150 MeV/nucleon]; 30Cl(p), (2p) [from 9Be(29S, n), E=150 MeV/nucleon]; measured Ep, Ip, Eγ, Iγ, pγ-coin; deduced total decay kinetic energy, decay energy spectrum. 30Cl; deduced levels, J, π, S(p). 28S; deduced levels, J, π, spectroscopic factors. Comparison to previous experimental results and shell model calculations.

doi: 10.1103/PhysRevC.105.044321
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2022PR02      Phys.Rev. C 105, 034319 (2022)

S.Prill, A.Bohn, V.Everwyn, G.Hafner, F.Heim, M.Spieker, M.Weinert, J.Wilhelmy, A.Zilges

Lifetime analysis of 128, 130Te via the Doppler-shift attenuation method

NUCLEAR REACTIONS 128Te(p, p'γ), E=8.8 MeV; 130Te(p, p'γ), E=10 MeV; measured Ep, Ip, Eγ, Iγ, pγ-coin. 128,130Te; deduced levels, J, π, T1/2 of excited states, B(E2), B(M1). p-γ-coincidence DSA technique for half-life determination. Comparison to shell-model calculations performed with NuShellX in the jj55pn model space. Combined SONIC (Si-detectors) and HORUS (HPGe-detectors) arrays.

doi: 10.1103/PhysRevC.105.034319
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2022RI07      Phys.Rev. C 106, 064308 (2022)

L.A.Riley, I.C.S.Hay, L.T.Baby, A.L.Conley, P.D.Cottle, J.Esparza, K.Hanselman, B.Kelly, K.W.Kemper, K.T.Macon, G.W.McCann, M.W.Quirin, R.Renom, R.L.Saunders, M.Spieker, I.Wiedenhover

54Fe(d, p)55Fe and the evolution of single neutron energies in the N=29 isotones

NUCLEAR REACTIONS 54Fe(d, p), E=16 MeV; measured Ep, Ip, angular distribution. 55Fe; deduced levels, J, π, spectroscopic factors, single-neutron energies for the 2p3/2, 2p1/2, 1f5/2, 1g9/2 and 2d5/2 orbits, spin-orbit splitting. Comparison with calculations made in the framework of covariant density functional theory using the covariant energy density functional FSUGarnet. Systematics of single-neutron energy for N=28 isotones (49Ca, 51Ti, 53Cr, 55Fe, 57Ni). Super-Enge Split-Pole Spectrograph at 9MV Super FN Tandem Van de Graaff Accelerator at the John D. Fox Laboratory (FSU).

doi: 10.1103/PhysRevC.106.064308
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2022SP04      Phys.Rev. C 106, 054305 (2022)

M.Spieker, L.A.Riley, P.D.Cottle, K.W.Kemper, D.Bazin, S.Biswas, P.J.Farris, A.Gade, T.Ginter, S.Giraud, J.Li, S.Noji, J.Pereira, M.Smith, D.Weisshaar, R.G.T.Zegers

Investigation of octupole collectivity near the A = 72 shape-transitional point

NUCLEAR REACTIONS 1H(76Kr, p), (74Kr, p), (72Se, p), E(cm)≈ 100 MeV/nucleon; measured Eγ, Iγ, γγ-coin, angular distribution; deduced levels, J, π, B(E2), B(E3). Comparison to theoretical calculations performed in the framework of the configuration-mixing sdf IBM mapping approach. Systematics of B(E3) transition strength in Kr, Se and Ge isotopes. Established two regions of distinct octupole strengths with a sudden strength increase around the A = 72 prolate-oblate-triaxial shape-transitional point. Ursinus liquid hydrogen target coupled to 8 GRETINA modules, containing four, 36-fold segmented HPGe detectors each. Beams produced from a 150-MeV/nucleon 78Kr primary beam in projectile fragmentation on 9Be target at Coupled Cyclotron Facility NSCL.

doi: 10.1103/PhysRevC.106.054305
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2021AS06      Phys.Rev. C 103, L051302 (2021)

J.Ash, H.Iwasaki, T.Mijatovic, T.Budner, R.Elder, B.Elman, M.Friedman, A.Gade, M.Grinder, J.Henderson, B.Longfellow, A.Revel, D.Rhodes, M.Spieker, Y.Utsuno, D.Weisshaar, C.Y.Wu

Cross-shell excitations in 46Ca studied with fusion reactions induced by a reaccelerated rare isotope beam

NUCLEAR REACTIONS 7Li(45K, 2nα)46Ca, E=4.66 MeV/nucleon, [secondary 45K beam from 9Be(48Ca, X) primary reaction, followed by separation of fragments using A1900 fragment separator at NSCL-MSU]; measured charged-particle recoils, Eγ, Iγ, (particle)γγ-coin using JANUS array of SeGA array of sixteen 32-fold segmented HPGe detectors, and an annular double-sided silicon detector. 46Ca; deduced levels, J, π, rotational-like band built on the excited 0+ state, configurations. Comparison with shell-model calculations in the sd-pf-sdg orbital space.

doi: 10.1103/PhysRevC.103.L051302
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2021CR01      Phys.Lett. B 816, 136210 (2021)

F.C.L.Crespi, A.Bracco, E.G.Lanza, A.Tamii, N.Blasi, F.Camera, O.Wieland, N.Aoi, D.L.Balabanski, S.Bassauer, A.S.Brown, M.P.Carpenter, J.J.Carroll, M.Ciemala, A.Czeszumska, P.J.Davies, V.Derya, L.M.Donaldson, Y.D.Fang, H.Fujita, G.Gey, H.T.Ha, M.N.Harakeh, T.Hashimoto, N.Ichige, E.Ideguchi, A.Inoue, J.Isaak, C.Iwamoto, D.G.Jenkins, T.Klaus, N.Kobayashi, T.Koike, M.Krzysiek, M.K.Raju, M.Liu, A.Maj, L.Morris, P.von Neumann-Cosel, S.Noji, H.J.Ong, S.G.Pickstone, N.Pietralla, D.Savran, J.M.Schmitt, M.Spieker, G.Steinhilber, C.Sullivan, B.Wasilewska, M.Weinert, V.Werner, Y.Yamamoto, T.Yamamoto, R.G.T.Zegers, X.Zhou, S.Zhu, A.Zilges

The structure of low-lying 1- states in 90, 94Zr from (α, α'γ) and (p, p'γ) reactions

NUCLEAR REACTIONS 90,94Zr(p, p'γ), E=80 MeV; 90,94Zr(α, α'γ), E=130 MeV; measured reaction products, Eγ, Iγ; deduced ratio of the measured yields, dipole states σ, transition densities, low-lying dipole strength. The array CAGRA with HPGe detectors.

doi: 10.1016/j.physletb.2021.136210
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2021FA09      Eur.Phys.J. A 57, 191 (2021)

M.Farber, M.Weinert, M.Muscher, M.Spieker, J.Wilhelmy, A.Zilges

Low-energy excitations and γ-decay branchings in 124Sn via (p, p'γ) at Ep = 15 MeV

NUCLEAR REACTIONS 124Sn(p, p'), E=15 MeV; measured reaction products, Ep, Ip, Eγ, Iγ, p-γ-coin.; deduced σ(θ), ratio of γ-ray yields, γ-ray decay branching, level energies, J, π, isospin splitting of the Pygmy Dipole Resonance (PDR). The combined spectroscopy setup SONIC@HORUS at the Tandem accelerator of the University of Cologne.

doi: 10.1140/epja/s10050-021-00422-x
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2021HI09      Phys.Rev. C 104, 014305 (2021)

A.M.Hill, A.Gade, D.Bazin, B.A.Brown, B.Elman, P.Farris, J.Li, B.Longfellow, J.Pereira, A.Revel, D.Rhodes, M.Spieker, D.Weisshaar

In-beam γ-ray spectroscopy of 37-42P

NUCLEAR REACTIONS 12C(45Cl, X), 37P/38P/39P/40P/41P/42P, E=62.5 MeV/nucleon, [secondary 45Cl beam produced in 9Be(48Ca, X), E=140 MeV/nucleon primary reaction at NSCL-MSU, followed by separation of fragments using A1900 fragment separator]; measured reaction products and particle identification spectra by energy loss and time-of-flight using S800 spectrograph, ionization chamber and plastic scintillators, Eγ, Iγ, γγ- and (particle)g-coin, T1/2 of levels by Doppler shifts using GRETINA array of four 36-fold segmented HPGe crystals. 37,38,39,40,41,42P; deduced levels, J, π, γ-branching ratios, Nilsson configurations of low-lying levels. Comparison with shell-model calculations.

NUCLEAR STRUCTURE 37,38,39,40,41,42P; calculated levels, J, π, T1/2 of levels, level schemes with γ transitions, E2 matrix elements, B(M1), B(E2), magnetic dipole and electric quadrupole moments using shell-model with SDPF-MU interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.014305
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2021LO08      Phys.Rev. C 103, 054309 (2021)

B.Longfellow, D.Weisshaar, A.Gade, B.A.Brown, D.Bazin, K.W.Brown, B.Elman, J.Pereira, D.Rhodes, M.Spieker

Quadrupole collectivity in the neutron-rich sulfur isotopes 38, 40, 42, 44S

NUCLEAR REACTIONS 209Bi(38S, 38S'), E=75 MeV; 209Bi(40S, 40S'), E=76 MeV; 209Bi(42S, 42S'), E=80 MeV; 209Bi(44S, 44S'), E=73 MeV, [secondary 38,40,42,44S beams from 9Be(48Ca, X), E=140 MeV/nucleon primary reaction, followed by separation of fragments using A1900 fragment separator at the NSCL-MSU facility]; measured reaction products, particle identification from energy loss and time of flight, Eγ, Iγ, (scattered S ions)γ-coin using S800 spectrograph for particles and CAESAR array of 192 CsI(Na) detectors for γ rays in intermediate-energy Coulomb excitation. 38,40,42,44S; deduced levels, B(E2) for the first 2+ states from Coulomb excitation yields and Alder-Winther model. Comparison with previous experimental results, and with predictions of shell-model calculations using the SDPF-MU Hamiltonian. Systematics of B(E2) values for the first 2+ states in 36,38,40,42,44,46S, 36,38,40,42,44,46,48Ar, 42,44,46,48,50Ca.

doi: 10.1103/PhysRevC.103.054309
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2021RH01      Phys.Rev. C 103, L051301 (2021)

D.Rhodes, B.A.Brown, J.Henderson, A.Gade, J.Ash, P.C.Bender, R.Elder, B.Elman, M.Grinder, M.Hjorth-Jensen, H.Iwasaki, B.Longfellow, T.Mijatovic, M.Spieker, D.Weisshaar, C.Y.Wu

Exploring the role of high-j configurations in collective observables through the Coulomb excitation of 106Cd

NUCLEAR REACTIONS 208Pb(106Cd, 106Cd'), E=4.03, 4.36 MeV/nucleon; 48Ti(106Cd, 106Cd'), E=3 MeV/nucleon; measured scattered 106Cd and recoil 208Pb, Eγ, Iγ, (particle)γ-coin, angular distributions, γ-ray yields using the JANUS array of two annular Si detectors and SeGA array of sixteen 32-fold segmented HPGe detectors at NSCL-MSU Re-accelerator facility. 106Cd; deduced levels, J, π, E2, M1 and E3 transition matrix elements, B(E2), level half-lives, spectroscopic quadrupole moments, ground-state rotational invariants and quadrupole moments, analysis using GOSIA and GOSIA2 least-squares fitting codes. Comparison with results of previous measurements and with shell-model calculations.

doi: 10.1103/PhysRevC.103.L051301
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2021WE16      Phys.Rev.Lett. 127, 242501 (2021)

M.Weinert, M.Spieker, G.Potel, N.Tsoneva, M.Muscher, J.Wilhelmy, A.Zilges

Microscopic Structure of the Low-Energy Electric Dipole Response of 120Sn

NUCLEAR REACTIONS 119Sn(d, p), E=8.5 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray yields, pygmy dipole resonance. Detailed structure input from energy-density functional plus quasiparticle-phonon model theory with reaction theory.

doi: 10.1103/PhysRevLett.127.242501
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2020LO05      Phys.Rev. C 101, 031303 (2020)

B.Longfellow, A.Gade, J.A.Tostevin, E.C.Simpson, B.A.Brown, A.Magilligan, D.Bazin, P.C.Bender, M.Bowry, B.Elman, E.Lunderberg, D.Rhodes, M.Spieker, D.Weisshaar, S.J.Williams

Two-neutron knockout as a probe of the composition of states in 22Mg, 23Al, and 24Si

NUCLEAR REACTIONS 9Be(24Mg, 22Mg), E=95 MeV/nucleon; 9Be(25Al, 23Al), E=102 MeV/nucleon; 9Be(26Si, 24Si), E=109 MeV/nucleon, [secondary beams of 24Mg, 25Al and 26Si from 9Be(36Ar, X), E=150 MeV/nucleon primary reaction, followed by separation of fragments using A1900 fragment separator at NSCL-MSU facility]; measured reaction products, Eγ, Iγ, parallel momentum distributions using S800 spectrograph for particles and 192-element caesium-iodide scintillator array CAESAR for γ detection. 22Mg, 23Al, 24Si; deduced levels, J, π. Comparison with eikonal reaction theory and shell model calculations. Relevance to 23Al(p, γ)24Si astrophysical reaction rates.

doi: 10.1103/PhysRevC.101.031303
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2020LO12      Phys.Rev.Lett. 125, 232501 (2020)

B.Longfellow, D.Weisshaar, A.Gade, B.A.Brown, D.Bazin, K.W.Brown, B.Elman, J.Pereira, D.Rhodes, M.Spieker

Shape Changes in the N = 28 Island of Inversion: Collective Structures Built on Configuration-Coexisting States in 43S

NUCLEAR REACTIONS 209Bi(43S, 43S'), E=76 MeV/nucleon; measured reaction products, Eγ, Iγ. 43S; deduced γ-ray energies and intensities, J, π, B(E2) strengths. Comparison with SDPF-U and SDPF-MU shell-model calculations.

doi: 10.1103/PhysRevLett.125.232501
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2020OR05      Phys.Rev. C 102, 024323 (2020)

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

Collective 2p-2h intruder states in 118Sn studied via decay of 118In using the GRIFFIN spectrometer at TRIUMF

RADIOACTIVITY 118mIn(β-)[118mIn beam from U(p, X), E=480 MeV, followed by selection of ions through Ion-Guide Laser Ion Source (IG-LIS) at TRIUMF-ISAC]; measured Eγ, Iγ, Eβ, βγ- and γγ-coin, γγ(θ) using GRIFFIN array for γ detection, and SCEPTAR array for β particles. 118Sn; deduced levels, J, π, γ-branching ratios, mixing ratios, B(E2), β feedings, logft. Comparison with sd IBM-2 theoretical calculations using the computer code NPBOS. Comparison with evaluated data in the ENSDF database. Systematics of B(E2) values for transitions from 2+ states in 112,114,116,118,120,122Sn.

doi: 10.1103/PhysRevC.102.024323
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2020SC04      Phys.Rev. C 101, 045806 (2020)

P.Scholz, M.Guttormsen, F.Heim, A.C.Larsen, J.Mayer, D.Savran, M.Spieker, G.M.Tveten, A.V.Voinov, J.Wilhelmy, F.Zeiser, A.Zilges

Primary γ-ray intensities and γ-strength functions from discrete two-step γ-ray cascades in radiative proton-capture experiments

NUCLEAR REACTIONS 63,65Cu(p, γ), E=2.0, 3.5 MeV; measured Eγ, Iγ, γγ-coin, primary γ rays, two-step γ-ray cascades (TSCs) using the HORUS array of 14 HPGe detectors at the Institute for Nuclear Physics, University of Cologne. 64,66Zn; deduced levels, J, π, primary γ-ray intensities, dipole strength functions, and absolute γ-ray strength functions. Comparison with theoretical predictions, generalized Brink-Axel hypothesis, and other experimental results. Relevance of reaction rates of radiative capture reactions to nucleosynthesis of heavy nuclei in explosive stellar environments.

doi: 10.1103/PhysRevC.101.045806
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2020SI09      Eur.Phys.J. A 56, 105 (2020)

J.Sinclair, M.Scheck, S.W.Finch, Krishichayan, U.Friman-Gayer, W.Tornow, G.Battaglia, T.Beck, R.Chapman, M.M.R.Chishti, Ch.Fransen, R.Gonzales, E.Hoemann, J.Isaak, R.V.F.Janssens, D.A.Jaroszynski, S.Johnson, M.D.Jones, J.M.Keatings, N.Kelly, J.Kleemann, D.Little, B.Loher, K.R.Mashtakov, M.Muscher, D.O'Donnell, O.Papst, E.E.Peters, D.Savran, M.Schilling, R.Schwengner, P.Spagnoletti, M.Spieker, V.Werner, J.Wilhelmy, O.Wieland, S.W.Yates, A.Zilges

Firm spin and parity assignments for high-lying, low-spin levels in stable Si isotopes

doi: 10.1140/epja/s10050-020-00118-8
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2020SP05      Phys.Rev.Lett. 125, 102503 (2020)

M.Spieker, A.Heusler, B.A.Brown, T.Faestermann, R.Hertenberger, G.Potel, M.Scheck, N.Tsoneva, M.Weinert, H.-F.Wirth, A.Zilges

Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in 208Pb

NUCLEAR REACTIONS 207Pb(d, p), E=22 MeV; measured reaction products, Ep, Ip; deduced σ(θ), B(E1), transition densities, Pygmy Dipole Resonance. Comparison with large-scale shell model calculations.

doi: 10.1103/PhysRevLett.125.102503
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2019FA10      Acta Phys.Pol. B50, 475 (2019)

M.Farber, A.Bohn, V.Everwyn, M.Muscher, S.G.Pickstone, S.Prill, P.Scholz, M.Spieker, M.Weinert, J.Wilhelmy, A.Zilges

Study of Dipole Excitations in 124Sn via (p, p' γ) at 15 MeV

NUCLEAR REACTIONS 124Sn(p, p'), E=15 MeV; measured Ep, Eγ, Iγ, pγ-coin. 124Sn; deduced levels, J, π, γ-decay branching ratios for low-spin states. Combined SONIC (Si-detectors) and HORUS (HPGe-detectors) arrays. Comparison to (γ, γ') and (α, α') experimental data.

doi: 10.5506/aphyspolb.50.475
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2019HE07      Phys.Rev. C 99, 054313 (2019)

J.Henderson, C.Y.Wu, J.Ash, B.A.Brown, P.C.Bender, R.Elder, B.Elman, A.Gade, M.Grinder, H.Iwasaki, B.Longfellow, T.Mijatovic, D.Rhodes, M.Spieker, D.Weisshaar

Triaxiality in selenium-76

NUCLEAR REACTIONS 208Pb(76Se, 76Se'), E=3.55, 4.07 MeV/nucleon; measured scattered beam- and target-like nuclei, Eγ, Iγ, (particle)γ-coin using the JANUS silicon detector array for Coulomb excitation and SeGA array for γ detection at the NSCL-MSU facility. 76Se; deduced levels, Coulomb excitation yields, reduced E2 and M1 matrix elements, B(E2), B(M1), spectroscopic quadrupole moments. GOSIA least-squares fit analysis. Systematics of <Q2> and <δ> experimental and theoretical values for 74,76,78,80,82Se. Comparison with previous experimental data, and with shell model calculations using jj44b and JUN45 interactions.

doi: 10.1103/PhysRevC.99.054313
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2019LO06      Phys.Rev. C 99, 064330 (2019)

B.Longfellow, A.Gade, B.A.Brown, D.Bazin, P.C.Bender, M.Bowry, P.D.Cottle, B.Elman, E.Lunderberg, A.Magilligan, M.Spieker, D.Weisshaar, S.J.Williams

Spectroscopy and lifetime measurements near the proton drip line: 26, 27, 28P

NUCLEAR REACTIONS 9Be(26Si, 26P), (27P, 26P), (28S, 26P), (26Si, 27P), (30S, 27P), (34Ar, 27P), (29P, 28P), (34Ar, 28P), (33Cl, 28P), (30S, 28P), (28Si, 27Si), E=118 MeV/nucleon, [secondary beams from 9Be(36Ar, X), E=150 MeV/nucleon primary beam, followed by fragment separation by A1900 fragment separator at NSCL-MSU facility]; measured reaction products, particle identification plot, Eγ, Iγ using CEASAR and SeGA arrays for γ detection and the S800 spectrograph focal plane detectors for charged particle identification. 26,27,28P, 27Si; deduced levels, J, π, level half-lives; calculated Thomas-Ehrman shifts applied to energies in mirror nuclei. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.99.064330
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2019PE06      Phys.Rev. C 99, 024303 (2019)

C.M.Petrache, J.-M.Regis, C.Andreoiu, M.Spieker, C.Michelagnoli, P.E.Garrett, A.Astier, E.Dupont, F.Garcia, S.Guo, G.Hafner, J.Jolie, F.Kandzia, V.Karayonchev, Y.-H.Kim, L.Knafla, U.Koster, B.F.Lv, N.Marginean, C.Mihai, P.Mutti, K.Ortner, C.Porzio, S.Prill, N.Saed-Samii, W.Urban, J.R.Vanhoy, K.Whitmore, J.Wisniewski, S.W.Yates

Collectivity of the 2p-2h proton intruder band of 116Sn

NUCLEAR REACTIONS 115Sn(n, γ), E=thermal; measured Eγ, Iγ, γγ-coin, half-lives of levels using γγ-coin fast timing technique at ILL-Grenoble. 116Sn; deduced levels, J, π, B(E2) values of states in the normal and intruder configurations. Comparison with previous measurements, and with theoretical predictions using IBM-2. Systematics of levels, J, π and half-lives in 110,112,114,116,118,120,122Sn.

doi: 10.1103/PhysRevC.99.024303
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2019SP02      Phys.Rev. C 99, 051304 (2019)

M.Spieker, A.Gade, D.Weisshaar, B.A.Brown, J.A.Tostevin, B.Longfellow, P.Adrich, D.Bazin, M.A.Bentley, J.R.Brown, C.M.Campbell, C.Aa.Diget, B.Elman, T.Glasmacher, M.Hill, B.Pritychenko, A.Ratkiewicz, D.Rhodes

One-proton and one-neutron knockout reactions from N = Z = 28 56Ni to the A = 55 mirror pair 55Co and 55Ni

NUCLEAR REACTIONS 9Be(56Ni, 55Co), (56Ni, 55Ni), E=85.9 MeV/nucleon, [secondary 56Ni beam from 9Be(58Ni, X), E=160 MeV/nucleon primary reaction, followed by separation using A1900 fragment separator]; measured Eγ, Iγ, partial σ, and parallel momentum distributions using SeGA array for γ detection, and S800 magnetic spectrograph for knockout residues at the NSCL-MSU facility. 55Co, 55Ni; deduced levels, J, π, mirror energy differences (MEDs) between 55Co and 55Ni, configurations. Comparison with large scale shell model calculations.

doi: 10.1103/PhysRevC.99.051304
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2019SP06      Phys.Rev. C 100, 061303 (2019)

M.Spieker, D.Weisshaar, A.Gade, B.A.Brown, P.Adrich, D.Bazin, M.A.Bentley, J.R.Brown, C.M.Campbell, C.Aa.Diget, B.Elman, T.Glasmacher, M.Hill, B.Longfellow, B.Pritychenko, A.Ratkiewicz, D.Rhodes, J.A.Tostevin

Experimental identification of the T=1, Jπ=6+ state of 54Co and isospin symmetry in A=54 studied via one-nucleon knockout reactions

NUCLEAR REACTIONS 9Be(55Co, 54Co), (55Co, 54Fe), E not given, [secondary 55Co beam from 9Be(58Ni, X), E=160 MeV/nucleon, followed by separation of 55Co using A1900 fragment separator at NSCL-MSU]; measured projectile-like reaction residues, Eγ, Iγ, (particle)γ-coin using the S800 spectrograph for particles and SeGA array for γ rays. 54Co, 54Fe; deduced levels, J, π, cross sections for population of levels. Comparison with large-scale-shell-model (LSSM) calculations; investigated possible isospin-symmetry breaking in the A=54, T=1 triplet through the isobaric mass multiplet equation (IMME).

doi: 10.1103/PhysRevC.100.061303
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2019TS06      Nucl.Phys. A990, 183 (2019)

N.Tsoneva, M.Spieker, H.Lenske, A.Zilges

Fine structure of the pygmy quadrupole resonance in 112, 114Sn

doi: 10.1016/j.nuclphysa.2019.07.008
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2018HE14      Phys.Rev.Lett. 121, 082502 (2018)

J.Henderson, C.Y.Wu, J.Ash, P.C.Bender, B.Elman, A.Gade, M.Grinder, H.Iwasaki, E.Kwan, B.Longfellow, T.Mijatovic, D.Rhodes, M.Spieker, D.Weisshaar

Localizing the Shape Transition in Neutron-Deficient Selenium

NUCLEAR REACTIONS 208Pb(72Se, 72Se'), E=4 MeV/nucleon; measured reaction products, Eγ, Iγ. 72Se; deduced spectroscopic quadrupole moments, lack of low-spin shape change in neutron-deficient selenium.

doi: 10.1103/PhysRevLett.121.082502
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2018SA49      Phys.Lett. B 786, 16 (2018)

D.Savran, V.Derya, S.Bagchi, J.Endres, M.N.Harakeh, J.Isaak, N.Kalantar-Nayestanaki, E.G.Lanza, B.Loher, A.Najafi, S.Pascu, S.G.Pickstone, N.Pietralla, V.Yu.Ponomarev, C.Rigollet, C.Romig, M.Spieker, A.Vitturi, A.Zilges

Multi-messenger investigation of the Pygmy Dipole Resonance in 140Ce

NUCLEAR REACTIONS 140Ce(p, p'), E=80 MeV; measured reaction products, Eγ, Iγ; deduced σ(θ), Pygmy Dipole Resonance single excitations. Comparison with the Quasi-particle Phonon Model calculations.

doi: 10.1016/j.physletb.2018.09.025
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2018SP01      Phys.Rev. C 97, 054319 (2018)

M.Spieker, P.Petkov, E.Litvinova, C.Muller-Gatermann, S.G.Pickstone, S.Prill, P.Scholz, A.Zilges

Shape coexistence and collective low-spin states in 112, 114Sn studied with the (p, p'γ) Doppler-shift attenuation coincidence technique

NUCLEAR REACTIONS 112,114Sn(p, p'γ), E=8 MeV; measured Eγ, Iγ, pγ-, γγ-coin, Eγ(θ), level half-lives by DSAM using SONIC-HORUS combined spectroscopy setup at the Institute for Nuclear Physics of the University of Cologne. 112,114Sn; deduced levels, J, π, multipolarities, mixing ratios, B(E2), B(E1) γ-decay branching ratios for low-spin states, shape coexistence in low-spin members of the proton 2p-2h intruder configurations, and candidates for 3-phonon and quadrupole-octupole coupled states. Comparison with previous experimental values, and predictions of the sd IBM-2 calculations. Comparison of B(E2) values with those in 108,110Pd, 116,118Xe. Systematics of low-lying single-particle states in A=111-125 odd-A Sn isotopes, 1-, 3- and 5- states and B(E1) for 1- states in A=112-124 even-A Sn isotopes.

doi: 10.1103/PhysRevC.97.054319
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2018SP02      Phys.Rev. C 97, 064319 (2018)

M.Spieker, S.Pascu, D.Bucurescu, T.M.Shneidman, T.Faestermann, R.Hertenberger, H.-F.Wirth, N.-V.Zamfir, A.Zilges

High-resolution (p, t) study of low-spin states in 240Pu: Octupole excitations, α clustering, and other structure features

NUCLEAR REACTIONS 242Pu(p, t), E=24 MeV; measured E(t), I(t), differential σ(θ), and total σ using the Q3D magnetic spectrograph of MLL-Munich. 240Pu; deduced levels, J, π, configurations, rotational band structure, moments of inertia of band members, origin of excited 0+ states, B(E1)/B(E2), summed B(E1) strength. Comparison with previous experimental values, and spdf IBM and α-cluster model theoretical predictions. Comparison of experimental σ(θ) values with coupled-channel distorted-wave Born approximation (DWBA) calculations with CHUCK3 code. 186W, 232Th(p, t), E=24 MeV; measured E(t), I(t); deduced levels, used for calibration of levels in 240Pu.

NUCLEAR STRUCTURE 238,240Pu, 226,228,230,232Th, 232,234,238U, 224,226,228Ra; analyzed experimental excitation energy, B(E1), B(E2) and B(E3) values; deduced octupole correlations, effect of negative-parity single particle states and potential role of double-octupole or α-clustering states on enhanced B(E1).

doi: 10.1103/PhysRevC.97.064319
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2018WI07      Phys.Rev. C 98, 034315 (2018)

J.Wilhelmy, A.Brown, P.Erbacher, U.Gayer, J.Isaak, Krishichayan, B.Loher, M.Muscher, H.Pai, N.Pietralla, P.Ries, D.Savran, P.Scholz, M.Spieker, W.Tornow, V.Werner, A.Zilges

Investigation of J=1 states and their γ-decay behavior in 52Cr

NUCLEAR REACTIONS 52Cr(polarized γ, γ'), E=5.5-9.2 MeV; measured Eγ, Iγ of primary and secondary γ rays, energy integrated σ in nuclear resonance fluorescence (NRF) experiments using γ3 array at the HIγS-TUNL facility. 52Cr; deduced levels, J, π, Γ0, γ-branching ratios, B(M1), B(E1), summed M1 strength. Comparison with shell model calculations, and previous experimental results.

doi: 10.1103/PhysRevC.98.034315
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2017KO34      Eur.Phys.J. A 53, 175 (2017)

D.Kocheva, G.Rainovski, J.Jolie, N.Pietralla, A.Blazhev, A.Astier, R.Altenkirch, S.Ansari, Th.Braunroth, M.L.Cortes, A.Dewald, F.Diel, M.Djongolov, C.Fransen, K.Gladnishki, A.Hennig, V.Karayonchev, J.M.Keatings, E.Kluge, J.Litzinger, C.Muller-Gatermann, P.Petkov, M.Rudigier, M.Scheck, Ph.Scholz, P.Spagnoletti, M.Spieker, C.Stahl, R.Stegmann, M.Stoyanova, P.Thole, N.Warr, V.Werner, W.Witt, D.Wolk, K.O.Zell, P.Van Isacker, V.Yu.Ponomarev

A revised B(E2;2+1 → 0+1) value in the semi-magic nucleus 210Po

NUCLEAR REACTIONS 208Pb(12C, 10Be), E=62 MeV; measured Eγ, Iγ(θ), γγ-coin, (particle)γ-coin using 11 HPGe, light reaction fragments using solar cells array. 210Po; deduced 2+1 state T1/2 using the line shape of the transition, branching ratios to this state from upper states, B(E1), B(E2), B(E3), B(M1), T1/2 of three states and transitions; calculated low-lying states energy, structure, B(E1), B(E2), B(E3), B(M1) using QPM (Quasiparticle Phonon Model). Compared with data.

doi: 10.1140/epja/i2017-12367-5
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2017PI13      Nucl.Instrum.Methods Phys.Res. A875, 104 (2017)

S.G.Pickstone, M.Weinert, M.Farber, F.Heim, E.Hoemann, J.Mayer, M.Muscher, S.Prill, P.Scholz, M.Spieker, V.Vielmetter, Ju.Wilhelmy, A.Zilges

Combining α-ray and particle spectroscopy with SONICatHORUS

NUCLEAR REACTIONS 92Mo(p, pγ), E=10.5 MeV; 119Sn(d, pγ), E=10 MeV; 60Ni(p, pγ), E=15 MeV; 94Mo(p, pγ), E=13.5 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, branching ratios.

doi: 10.1016/j.nima.2017.09.016
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2016SP01      Phys.Lett. B 752, 102 (2016)

M.Spieker, N.Tsoneva, V.Derya, J.Endres, D.Savran, M.N.Harakeh, S.Harissopulos, R.-D.Herzberg, A.Lagoyannis, H.Lenske, N.Pietralla, L.Popescu, M.Scheck, F.Schluter, K.Sonnabend, V.I.Stoica, H.J.Wortche, A.Zilges

The pygmy quadrupole resonance and neutron-skin modes in 124Sn

NUCLEAR REACTIONS 124Sn(α, α'), E=34 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced σ(θ), B(E2), pygmy quadrupole resonance. Comparison with quasiparticle random-phase approximation calculations.

doi: 10.1016/j.physletb.2015.11.004
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2015HE17      Nucl.Instrum.Methods Phys.Res. A794, 171 (2015)

A.Hennig, V.Derya, M.N.Mineva, P.Petkov, S.G.Pickstone, M.Spieker, A.Zilges

Lifetime measurement of excited low-spin states via the (p, p'γ) reaction

NUCLEAR REACTIONS 96Ru(p, p'), E=7 MeV; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, T1/2. Doppler-shift attenuation method (DSAM) following the inelastic proton scattering reaction, comparison with available data.

doi: 10.1016/j.nima.2015.05.024
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2015HE32      Phys.Rev. C 92, 064317 (2015)

A.Hennig, T.Ahn, V.Anagnostatou, A.Blazhev, N.Cooper, V.Derya, M.Elvers, J.Endres, P.Goddard, A.Heinz, R.O.Hughes, G.Ilie, M.N.Mineva, P.Petkov, S.G.Pickstone, N.Pietralla, D.Radeck, T.J.Ross, D.Savran, M.Spieker, V.Werner, A.Zilges

Collective excitations of 96Ru by means of (p, p'γ) experiments

NUCLEAR REACTIONS 96Ru(p, p'), E=8.4, 7 MeV; measured Ep, Ip, proton angular distributions, Eγ, Iγ, pγ- and γγ-coin, γγ(θ) using YRAST ball spectrometer at WNSL-Yale accelerator facility, level half-lives by DSAM using HORUS γ-ray spectrometer at IKP-Cologne accelerator facility. 96Ru; deduced levels, J, π, multipolarity, mixing ratios, configuration, B(E2), B(M1), B(E1), one-phonon mixed-symmetry excitations of octupole and hexadecapole character, two-phonon mixed-symmetry quintuplet. Comparison with sdg-IBM-2 and shell-model calculations.

NUCLEAR STRUCTURE 96Ru; calculated levels, J, π, B(M1), B(E2) using sdg-IBM-2 and shell-model. Comparison with experimental data.

doi: 10.1103/PhysRevC.92.064317
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2015NE07      Phys.Lett. B 744, 358 (2015)

L.Netterdon, A.Endres, S.Goriely, J.Mayer, P.Scholz, M.Spieker, A.Zilges

Experimental constraints on the γ-ray strength function in 90Zr using partial cross sections of the 89Y(p, γ)90Zr reaction

NUCLEAR REACTIONS 89Y(p, γ), E=3.65-4.7 MeV; measured reaction products, Eγ, Iγ; deduced σ, energies, J, π, E1 strength, reaction rates. Comparison with available data.

doi: 10.1016/j.physletb.2015.04.018
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2271.


2015PA14      Phys.Rev. C 91, 034321 (2015)

S.Pascu, D.Bucurescu, Gh.Cata-Danil, V.Derya, M.Elvers, D.Filipescu, D.G.Ghita, T.Glodariu, A.Hennig, C.Mihai, N.Marginean, R.Marginean, A.Negret, L.Netterdon, S.G.Pickstone, T.Sava, M.Spieker, L.Stroe, N.V.Zamfir, A.Zilges

Detailed spectroscopy of quadrupole and octupole states in 168Yb

NUCLEAR REACTIONS 166Er(α, 2n), E=25.5 MeV; measured Eγ, Iγ, γγ-coin, level half-lives by γγ(t) using HORUS array at tandem accelerator facility in Cologne. 168Yb; deduced levels, J, K, π, bands, β, γ and octupole vibrational bands, B(E1), B(E2), branching ratios compared with Alaga rules. Systematics of branching ratios for 2- states of Kπ=2- octupole-vibrational band in A=154-186 Gd, Dy, Er, Yb, Hf W nuclei. Comparison of level structure of 168Yb with IBM-spdf calculations.

NUCLEAR STRUCTURE 168Yb; calculated levels, J, K, π, bands, B(E1) using IBM-spdf. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.034321
Citations: PlumX Metrics

Data from this article have been entered in the XUNDL database. For more information, click here.


2015SP02      Phys.Rev.Lett. 114, 192504 (2015)

M.Spieker, S.Pascu, A.Zilges, F.Iachello

Origin of Low-Lying Enhanced E1 Strength in Rare-Earth Nuclei

NUCLEAR STRUCTURE 142,144,146,148,150Nd, 148,150Sm, 156,160Gd, 162,164Dy; calculated B(E1) distributions. spdf interacting boson model calculations, comparison with experimental data.

doi: 10.1103/PhysRevLett.114.192504
Citations: PlumX Metrics


2014HE28      Phys.Rev. C 90, 051302 (2014)

A.Hennig, M.Spieker, V.Werner, T.Ahn, V.Anagnostatou, N.Cooper, V.Derya, M.Elvers, J.Endres, P.Goddard, A.Heinz, R.O.Hughes, G.Ilie, M.N.Mineva, P.Petkov, S.G.Pickstone, N.Pietralla, D.Radeck, T.J.Ross, D.Savran, A.Zilges

Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones

NUCLEAR REACTIONS 96Ru(p, p'), E=7.0, 8.4 MeV; measured Ep, Ip, Eγ, Iγ, pγ-coin, γγ(θ), level half-life by centroid-shift method using YRAST Ball spectrometer and Si detectors at Yale ESTU Tandem accelerator facility, and HORUS γ-detector array and particle-detector array SONIC at Cologne FN Tandem accelerator facility. 96Ru; deduced levels, J, π, branching ratios, multipole mixing ratios, B(M1), B(E2), mixed-symmetry states (MSS) of octupole and hexadecapole character. Evidence for one-phonon mixed-symmetry character of the second 3(-) and 4+ states. Comparison with sdg-IBM-2 model calculations.

doi: 10.1103/PhysRevC.90.051302
Citations: PlumX Metrics

Data from this article have been entered in the XUNDL database. For more information, click here.


2014NE18      Nucl.Instrum.Methods Phys.Res. A 754, 94 (2014)

L.Netterdon, V.Derya, J.Endres, C.Fransen, A.Hennig, J.Mayer, C.Muller-Gatermann, A.Sauerwein, P.Scholz, M.Spieker, A.Zilges

The γ-ray spectrometer HORUS and its applications for nuclear astrophysics

NUCLEAR REACTIONS 89Y(p, γ), E=3.5-4.6 MeV; measured products, Eγ, Iγ; deduced σ, σ(E). Data were imported from EXFOR entry O2203.

doi: 10.1016/j.nima.2014.04.025
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2203.


2013SP03      Phys.Rev. C 88, 041303 (2013)

M.Spieker, D.Bucurescu, J.Endres, T.Faestermann, R.Hertenberger, S.Pascu, S.Skalacki, S.Weber, H.-F.Wirth, N.-V.Zamfir, A.Zilges

Possible experimental signature of octupole correlations in the 0+2 states of the actinides

NUCLEAR REACTIONS 242Pu(p, t), E=24 MeV; measured triton spectra, σ(θ) using Q3D spectrograph at MLL-Munich facility. 240Pu; deduced levels, J, π, L-transfer, transition strengths for 0+ excited states. DWBA analysis of σ(θ) data. Comparison with summed relative (p, t) strengths and B(E1)/B(E2) ratios with other actinide nuclei and with spdf interacting boson model calculations. Possible double-octupole structure of first excited 0+ states in actinides. Systematics of energies of first 3- and second 0+ states in N=132-148, Ra, Th, U and Pu nuclei.

doi: 10.1103/PhysRevC.88.041303
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2180. Data from this article have been entered in the XUNDL database. For more information, click here.


2012PI03      Acta Phys.Pol. B43, 319 (2012)

S.G.Pickstone, V.Derya, M.Elvers, J.Endres, C.Fransen, A.Hennig, J.Mayer, L.Netterdon, G.Pascovici, S.Pascu, A.Sauerwein, F.Schluter, P.Scholz, M.Spieker, N.Warr, A.Zilges

Digital Data Acquisition for γ and Particle Spectroscopy

doi: 10.5506/APhysPolB.43.319
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