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NSR database version of April 11, 2024.

Search: Author = A.Ekstrom

Found 65 matches.

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2023KO15      Nature(London) 620, 965 (2023)

Y.Kondo, N.L.Achouri, H.Al Falou, L.Atar, T.Aumann, H.Baba, K.Boretzky, C.Caesar, D.Calvet, H.Chae, N.Chiga, A.Corsi, F.Delaunay, A.Delbart, Q.Deshayes, Zs.Dombradi, C.A.Douma, A.Ekstrom, Z.Elekes, C.Forssen, I.Gasparic, J.-M.Gheller, J.Gibelin, A.Gillibert, G.Hagen, M.N.Harakeh, A.Hirayama, C.R.Hoffman, M.Holl, A.Horvat, A.Horvath, J.W.Hwang, T.Isobe, W.G.Jiang, J.Kahlbow, N.Kalantar-Nayestanaki, S.Kawase, S.Kim, K.Kisamori, T.Kobayashi, D.Korper, S.Koyama, I.Kuti, V.Lapoux, S.Lindberg, F.M.Marques, S.Masuoka, J.Mayer, K.Miki, T.Murakami, M.Najafi, T.Nakamura, K.Nakano, N.Nakatsuka, T.Nilsson, A.Obertelli, K.Ogata, F.de Oliveira Santos, N.A.Orr, H.Otsu, T.Otsuka, T.Ozaki, V.Panin, T.Papenbrock, S.Paschalis, A.Revel, D.Rossi, A.T.Saito, T.Y.Saito, M.Sasano, H.Sato, Y.Satou, H.Scheit, F.Schindler, P.Schrock, M.Shikata, N.Shimizu, Y.Shimizu, H.Simon, D.Sohler, O.Sorlin, L.Stuhl, Z.H.Sun, S.Takeuchi, M.Tanaka, M.Thoennessen, H.Tornqvist, Y.Togano, T.Tomai, J.Tscheuschner, J.Tsubota, N.Tsunoda, T.Uesaka, Y.Utsuno, I.Vernon, H.Wang, Z.Yang, M.Yasuda, K.Yoneda, S.Yoshida

First observation of 28O

NUCLEAR REACTIONS H(29F, X)27O/28O, E=235 MeV/nucleon; measured reaction products; deduced yields. The hydrogen target was surrounded by the MINOS Time Projection Chamber, SAMURAI spectrometer, RIKEN RI Beam Factory.

RADIOACTIVITY 28O(4n), 27O(3n); measured decay products, En, In; deduced decay energy spectra and schemes from the measured momenta using the invariant-mass technique, resonance parameters. Comparison with the large-scale shell-model calculations using the new chiral effective field theory (EEdf3) interaction.

doi: 10.1038/s41586-023-06352-6
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2023MI02      Phys.Rev. C 107, 014002 (2023)

S.B.S.Miller, A.Ekstrom, C.Forssen

Posterior predictive distributions of neutron-deuteron cross sections

NUCLEAR REACTIONS 2H(n, X), E=10, 12, 35, 36, 65, 67 MeV; calculated posterior predictive distribution (PPD) for for σ(θ), PPD of the nd neutron analyzing power. PPD quantified using NN interactions from chiral effective field theory up to and including next-to-next-to-next-to-leading order (N3LO). Comparison to experimental data.

doi: 10.1103/PhysRevC.107.014002
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2023SV01      Phys.Rev. C 107, 014001 (2023)

I.Svensson, A.Ekstrom, C.Forssen

Bayesian estimation of the low-energy constants up to fourth order in the nucleon-nucleon sector of chiral effective field theory

NUCLEAR STRUCTURE 2,3H, 3,4He; calculated ground-state energy, point-proton radii. 2H; calculated electric quadrupole moment, D-state probability. Bayesian methods and Hamiltonian Monte Carlo (HMC) sampling used to infer the posterior probability density function (PDF) for the low-energy constants (LECs) up to next-to-next-to-next-to-leading order (N3LO) in a chiral effective field theory description of the nucleon-nucleon interaction. Comparison to empirical estimations and experimental results.

NUCLEAR REACTIONS 1H(p, p), (n, p), E<290 MeV; calculated np and pp scattering lengths and effective ranges.

doi: 10.1103/PhysRevC.107.014001
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2023TH06      Phys.Rev. C 108, 054002 (2023)

O.Thim, E.May, A.Ekstrom, C.Forssen

Bayesian analysis of chiral effective field theory at leading order in a modified Weinberg power counting approach

doi: 10.1103/PhysRevC.108.054002
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2023YA29      Eur.Phys.J. A 59, 233 (2023)

C.-J.Yang, A.Ekstrom, C.Forssen, G.Hagen, G.Rupak, U.van Kolck

The importance of few-nucleon forces in chiral effective field theory

NUCLEAR STRUCTURE 3H, 4He, 16O, 40Ca; calculated binding energy per nucleon with NN-only and NN+NNN interactions at leading order (LO) with coupled-cluster model of the equation of state for symmetric nuclear matter; deduced LO four-nucleon forces could play a crucial role for describing heavy-mass nuclei.

doi: 10.1140/epja/s10050-023-01149-7
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2022DJ01      Phys.Rev. C 105, 014005 (2022)

T.Djarv, A.Ekstrom, C.Forssen, H.T.Johansson

Bayesian predictions for A=6 nuclei using eigenvector continuation emulators

NUCLEAR STRUCTURE 3H, 3He; calculated binding energies. 4He, 6Li, 6He; calculated binding energies using LO, NLO, and N2LO Hamiltonians with and without the three-nucleon force (3NF), full posterior predictive distribution (PPD) for binding energies. 6Li, 6He; calculated S(deuteron) for 6Li, S(2n) for 6He, and Q(β-) for 6He g.s. Ab initio methods based on two- and three-nucleon interactions up to next-to-next-to-leading order in chiral effective field theory (χEFT), with Bayesian methods to quantify uncertainties from the many-body method, the χEFT truncation, and the low-energy constants of the nuclear interaction, and using JUPITERNCSM code a new M-scheme no-core shell model code. Comparison with available experimental data.

doi: 10.1103/PhysRevC.105.014005
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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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2022MI12      Phys.Rev. C 106, 024001 (2022)

S.B.S.Miller, A.Ekstrom, K.Hebeler

Neutron-deuteron scattering cross sections with chiral NN interactions using wave-packet continuum discretization

NUCLEAR REACTIONS 2H(n, n), E<90 MeV; calculated phase shifts, σ(θ), total σ, neutron analyzing power. Faddeev equations for elastic Nd scattering solved with wavepacket continuum-discretization (WPCD) method. Chiral nucleon-nucleon interactions up to next-to-next-to-leading order. Comparison to experimental data.

doi: 10.1103/PhysRevC.106.024001
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2022MI13      Phys.Rev. C 106, 024004 (2022)

C.Mishra, A.Ekstrom, G.Hagen, T.Papenbrock, L.Platter

Two-pion exchange as a leading-order contribution in chiral effective field theory

doi: 10.1103/PhysRevC.106.024004
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2022SV01      Phys.Rev. C 105, 014004 (2022)

I.Svensson, A.Ekstrom, C.Forssen

Bayesian parameter estimation in chiral effective field theory using the Hamiltonian Monte Carlo method

doi: 10.1103/PhysRevC.105.014004
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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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2021DJ02      Phys.Rev. C 104, 024324 (2021)

T.Djarv, A.Ekstrom, C.Forssen, G.R.Jansen

Normal-ordering approximations and translational (non)invariance

NUCLEAR STRUCTURE 4He, 16O; calculated center-of-mass (CM) excitation metrics and harmonic oscillator (HO) frequencies, ground-state energies per nucleon, eigenstates, point-proton radii. Single-reference normal-ordering two-body (SR-NO2B) approximation approach to potentially incorporate dominant three-nucleon force (3NF) as an effective two-nucleon force (2NF) in the framework of full no-core shell-model (NCSM) calculations, with and without three-nucleon forces.

doi: 10.1103/PhysRevC.104.024324
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2021KO08      Nat.Phys. 17, 439 (2021), Erratum Nat.Phys. 17, 539 (2021)

A.Koszorus, X.F.Yang, W.G.Jiang, S.J.Novario, S.W.Bai, J.Billowes, C.L.Binnersley, M.L.Bissell, T.E.Cocolios, B.S.Cooper, R.P.de Groote, A.Ekstrom, K.T.Flanagan, C.Forssen, S.Franchoo, R.F.Garcia Ruiz, F.P.Gustafsson, G.Hagen, G.R.Jansen, A.Kanellakopoulos, M.Kortelainen, W.Nazarewicz, G.Neyens, T.Papenbrock, P.-G.Reinhard, C.M.Ricketts, B.K.Sahoo, A.R.Vernon, S.G.Wilkins

Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of N = 32

NUCLEAR MOMENTS 36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52K; measured frequencies; deduced hyperfine structure spectra, charge radii, new magic numbers. Comparison with NNLO, HFB calculations.

doi: 10.1038/s41567-020-01136-5
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2021WE14      Phys.Rev. C 104, 064001 (2021)

S.Wesolowski, I.Svensson, A.Ekstrom, C.Forssen, R.J.Furnstahl, J.A.Melendez, D.R.Phillips

Rigorous constraints on three-nucleon forces in chiral effective field theory from fast and accurate calculations of few-body observables

NUCLEAR STRUCTURE 3H, 4He; calculated binding energies, rms point-proton radius of 4He, T1/2 of 3H β decay in the LO, NLO, and NNLO orders using three-nucleon force (3NF) of chiral effective field theory (χEFT), and compared with experimental values; evaluated Bayesian statistical methods for effective field theories of nuclei by using eigenvector continuation (EC) emulator.

doi: 10.1103/PhysRevC.104.064001
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2021YA13      Phys.Rev. C 103, 054304 (2021)

C.-J.Yang, A.Ekstrom, C.Forssen, G.Hagen

Power counting in chiral effective field theory and nuclear binding

NUCLEAR STRUCTURE 3H, 3,4He, 6Li, 16O; calculated ground-state energies and point-proton radii from ab initio no-core shell model (NCSM) and coupled-channel (CC) calculations at LO and NLO in χEFT using several power-counting (PC) schemes which all exhibit renormalization-group (RG)-invariance, and analysis of nucleon-nucleon scattering phase shifts. Comparison with experimental data.

doi: 10.1103/PhysRevC.103.054304
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2020DE11      Phys.Rev. C 101, 041302 (2020)

P.Demol, T.Duguet, A.Ekstrom, M.Frosini, K.Hebeler, S.Konig, D.Lee, A.Schwenk, V.Soma, A.Tichai

Improved many-body expansions from eigenvector continuation

NUCLEAR STRUCTURE 3H, 18O; calculated ground state energies using many-body perturbation theory (MBPT)-based eigenvector continuation (EC) resummation method for 3He, and Bogoliubov many-body perturbation theory (BMBPT)-based EC resummation method for 16O, using realistic nuclear two-body interaction derived from chiral effective field theory. Comparison with MBPT, BMBPT, and MBPT-based Pade approximation calculations.

doi: 10.1103/PhysRevC.101.041302
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2020JI11      Phys.Rev. C 102, 054301 (2020)

W.G.Jiang, A.Ekstrom, C.Forssen, G.Hagen, G.R.Jansen, T.Papenbrock

Accurate bulk properties of nuclei from A = 20 to ∞ from potentials with Δ isobars

NUCLEAR STRUCTURE 2,3H, 3,4He, 16,22,24O, 40,48,50,52,54,56,58,60Ca, 78Ni, 90Zr, 100,132Sn; calculated binding energies, and charge radii for Ca isotopes, quadrupole moment for 2H, first 3- state of 16O, and first 2+ states of 22O, 24O and 48Ca. Coupled-cluster calculations with ΔNNLOGO interactions optimized from chiral effective field theory. Comparison with experimental data. Computed neutron-proton and proton-proton phase shifts for the contact and selected peripheral partial waves with the ΔNLOGO and ΔNNLOGO potentials.

doi: 10.1103/PhysRevC.102.054301
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2019EK01      J.Phys.(London) G46, 095101 (2019)

A.Ekstrom, C.Forssen, C.Dimitrakakis, D.Dubhashi, H.T.Johansson, A.S.Muhammad, H.Salomonsson, A.Schliep

Bayesian optimization in ab initio nuclear physics

doi: 10.1088/1361-6471/ab2b14
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2019EK02      Phys.Rev.Lett. 123, 252501 (2019)

A.Ekstrom, G.Hagen

Global Sensitivity Analysis of Bulk Properties of an Atomic Nucleus

NUCLEAR STRUCTURE 16O; calculated energies, charge radius.

doi: 10.1103/PhysRevLett.123.252501
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2019WR01      Eur.Phys.J. A 55, 130 (2019)

K.Wrzosek-Lipska, K.Rezynkina, N.Bree, M.Zielinska, L.P.Gaffney, A.Petts, A.Andreyev, B.Bastin, M.Bender, A.Blazhev, B.Bruyneel, P.A.Butler, M.P.Carpenter, J.Cederkall, E.Clement, T.E.Cocolios, A.N.Deacon, J.Diriken, A.Ekstrom, C.Fitzpatrick, L.M.Fraile, Ch.Fransen, S.J.Freeman, J.E.Garcia-Ramos, K.Geibel, R.Gernhauser, T.Grahn, M.Guttormsen, B.Hadinia, K.Hadynska-Klek, M.Hass, P.-H.Heenen, R.-D.Herzberg, H.Hess, K.Heyde, M.Huyse, O.Ivanov, D.G.Jenkins, R.Julin, N.Kesteloot, Th.Kroll, R.Krucken, A.C.Larsen, R.Lutter, P.Marley, P.J.Napiorkowski, R.Orlandi, R.D.Page, J.Pakarinen, N.Patronis, P.J.Peura, E.Piselli, L.Prochniak, P.Rahkila, E.Rapisarda, P.Reiter, A.P.Robinson, M.Scheck, S.Siem, K.Singh Chakkal, J.F.Smith, J.Srebrny, I.Stefanescu, G.M.Tveten, P.Van Duppen, J.Van de Walle, D.Voulot, N.Warr, A.Wiens, J.L.Wood

Electromagnetic properties of low-lying states in neutron-deficient Hg isotopes: Coulomb excitation of 182Hg, 184Hg, 186Hg and 188Hg

NUCLEAR REACTIONS 112Cd(182Hg, 182Hg'), E=519 MeV; 120Sn, 107Ag, 112Cd(184Hg, 184Hg'), E=524 MeV; 120Sn, 107Ag, 114Cd(186Hg, 186Hg'), E=530 MeV; 120Sn, 107Ag, 114Cd(188Hg, 188Hg'), E=536 MeV; measured reaction products, Eγ, Iγ, X-rays. 182,184,186,188Hg; deduced γ-ray energies, J, π, transition E2 and M1 reduced matrix elements, branching ratios, B(E2). Comparison with theoretical calculations, GOSIA analysis. The Miniball set-up, REX postaccelerator.

doi: 10.1140/epja/i2019-12815-2
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2018AC07      Phys.Rev. C 98, 065506 (2018)

B.Acharya, A.Ekstrom, L.Platter

Effective-field-theory predictions of the muon-deuteron capture rate

NUCLEAR REACTIONS 2H(μ-, X), E=125-300 MeV; calculated distribution of central values and uncertainties for muon-capture rate, and capture rate as a function of proton-proton Spp factor using chiral effective-field-theory, and using the experimental value of triton β-decay half-life. Relevance to forthcoming experimental results from the MuSun Collaboration.

doi: 10.1103/PhysRevC.98.065506
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2018BA42      Phys.Rev. C 98, 054301 (2018)

A.Bansal, S.Binder, A.Ekstrom, G.Hagen, G.R.Jansen, T.Papenbrock

Pion-less effective field theory for atomic nuclei and lattice nuclei

NUCLEAR STRUCTURE 3H, 3,4He, 16O, 40Ca; calculated binding energies per nucleon and point-proton radii, g.s. energy and separation momentum of 3H and 4He, correlation between the triton and 4He binding energies. Pion-less effective field theory (EFT) as discrete variable representation (DVR) in the harmonic oscillator basis at leading-order and next-to-leading-order. Relevance to different lattice quantum chromodynamics (QCD) approaches to light nuclei.

doi: 10.1103/PhysRevC.98.054301
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2018EK02      Phys.Rev. C 97, 024332 (2018)

A.Ekstrom, G.Hagen, T.D.Morris, T.Papenbrock, P.D.Schwartz

Δ isobars and nuclear saturation

NUCLEAR STRUCTURE 2,3H, 3,4He; calculated binding energies, charge radii at LO, NLO, and NNLO with and without the Δ(1232) isobar as function of momentum cutoff values of 450 and 500 MeV. 4He, 16O, 40Ca; calculated ground-state energies per nucleon and charge radii computed with coupled cluster theory and the Δ-full potential at LO, NLO, and NNLO. 8He, 16,22,24O, 40,48Ca; calculated binding energies, charge radii, proton and neutron point radii, neutron skin. 40Ca; calculated elastic charge form factor. Chiral effective field theory with inclusion of the Δ-isobar Δ(1232) degree of freedom at all orders up to next-to-next-to-leading order (NNLO). Comparison with experimental data.

doi: 10.1103/PhysRevC.97.024332
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2018HE03      Phys.Lett. B 778, 377 (2018)

O.J.Hernandez, A.Ekstrom, N.N.Dinur, C.Ji, S.Bacca, N.Barnea

The deuteron-radius puzzle is alive: A new analysis of nuclear structure uncertainties

NUCLEAR STRUCTURE 2H; analyzed available data; deduced discrepancy between the calculated and the corresponding experimental deuteron radii.

doi: 10.1016/j.physletb.2018.01.043
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2017AC01      Phys.Rev. C 95, 031301 (2017)

B.Acharya, A.Ekstrom, D.Odell, T.Papenbrock, L.Platter

Corrections to nucleon capture cross sections computed in truncated Hilbert spaces

NUCLEAR REACTIONS 1H(n, γ), E(cm)=1 MeV; 1H(p, X), E(cm)=50, 1000 keV; calculated dependence of the nucleon capture cross section on the radius of the hard wall with Dirichlet boundary condition using computations based on hyperspherical harmonics. Relevance to rp-process.

doi: 10.1103/PhysRevC.95.031301
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2016BI07      Phys.Rev. C 93, 044332 (2016)

S.Binder, A.Ekstrom, G.Hagen, T.Papenbrock, K.A.Wendt

Effective field theory in the harmonic oscillator basis

NUCLEAR STRUCTURE 2,3H, 3,4He; calculated binding energies and radii from different effective interactions. 4He, 16O, 40Ca, 90Zr, 132Sn; calculated ground-state energies and squared point proton radii. Coupled-cluster calculations at the singles and doubles level using chiral effective field theory (EFT) in harmonic oscillator basis. Comparison with experimental data.

doi: 10.1103/PhysRevC.93.044332
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2016CL01      Phys.Rev.Lett. 116, 022701 (2016)

E.Clement, M.Zielinska, A.Gorgen, W.Korten, S.Peru, J.Libert, H.Goutte, S.Hilaire, B.Bastin, C.Bauer, A.Blazhev, N.Bree, B.Bruyneel, P.A.Butler, J.Butterworth, P.Delahaye, A.Dijon, D.T.Doherty, A.Ekstrom, C.Fitzpatrick, C.Fransen, G.Georgiev, R.Gernhauser, H.Hess, J.Iwanicki, D.G.Jenkins, A.C.Larsen, J.Ljungvall, R.Lutter, P.Marley, K.Moschner, P.J.Napiorkowski, J.Pakarinen, A.Petts, P.Reiter, T.Renstrom, M.Seidlitz, B.Siebeck, S.Siem, C.Sotty, J.Srebrny, I.Stefanescu, G.M.Tveten, J.Van de Walle, M.Vermeulen, D.Voulot, N.Warr, F.Wenander, A.Wiens, H.De Witte, K.Wrzosek-Lipska

Spectroscopic Quadrupole Moments in 96, 98Sr: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N=60

NUCLEAR REACTIONS 109Ag, 120Sn(96Sr, 96Sr'), E=275 MeV;60Ni, 208Pb(98Sr, 98Sr'), E=276 MeV; measured reaction products, Eγ, Iγ. 96,98Sr; deduced B(E2) and B(M1)values, spectroscopic quadrupole moments. Comparison with beyond-mean-field calculations using the Gogny D1S interaction, least squares fitting code GOSIA.

NUCLEAR STRUCTURE 96,98Sr; calculated B(E2) values with the Gogny D1S interaction in a five-dimensional collective Hamiltonian (5DCH) formalism.

doi: 10.1103/PhysRevLett.116.022701
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2016CL03      Phys.Rev. C 94, 054326 (2016)

E.Clement, M.Zielinska, S.Peru, H.Goutte, S.Hilaire, A.Gorgen, W.Korten, D.T.Doherty, B.Bastin, C.Bauer, A.Blazhev, N.Bree, B.Bruyneel, P.A.Butler, J.Butterworth, J.Cederkall, P.Delahaye, A.Dijon, A.Ekstrom, C.Fitzpatrick, C.Fransen, G.Georgiev, R.Gernhauser, H.Hess, J.Iwanicki, D.G.Jenkins, A.C.Larsen, J.Ljungvall, R.Lutter, P.Marley, K.Moschner, P.J.Napiorkowski, J.Pakarinen, A.Petts, P.Reiter, T.Renstrom, M.Seidlitz, B.Siebeck, S.Siem, C.Sotty, J.Srebrny, I.Stefanescu, G.M.Tveten, J.Van de Walle, M.Vermeulen, D.Voulot, N.Warr, F.Wenander, A.Wiens, H.De Witte, K.Wrzosek-Lipska

Low-energy Coulomb excitation of 96, 98Sr beams

NUCLEAR REACTIONS 60Ni, 208Pb(98Sr, 98Sr'), E=276.3 MeV; 109Ag, 120Sn(96Sr, 96Sr'), E=275.5 MeV; measured Eγ, Iγ, scattered Sr ions and target recoils, (particle)γ-coin, γ(θ), differential Coulomb excitation cross sections using Miniball array for γ detection and Si strip detectors for ions at REX-ISOLDE-CERN facility. 96,98Sr; deduced levels, E2 and M1 matrix elements, B(E2) and level half-lives, quadrupole moments and deformation parameters, E0 monopole transition strengths using GOSIA2 analysis. Comparison with previous experimental data and five-dimensional collective Hamiltonian and Gogny D1S force, and using complex excited VAMPIR approach. Systematics of level energies, transitional and spectroscopic quadrupole moments in 94,96Kr, 96,98Sr, 98,100Zr, 100,102Mo. Systematics of energy and B(E2) for first 2+ state, and energies of second 0+ states in 90,92,94,96,98,100,102Sr. 60Ni, 208Pb(98Rb, 98Rb'), E=276 MeV; measured Eγ, Iγ, scattered Rb ions and target recoils, (particle)γ-coin, γ(θ), level half-lives by recoil-distance Doppler shift method. 98Rb; deduced levels.

doi: 10.1103/PhysRevC.94.054326
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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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2016HA27      Nat.Phys. 12, 186 (2016)

G.Hagen, A.Ekstrom, C.Forssen, G.R.Jansen, W.Nazarewicz, T.Papenbrock, K.A.Wendt, S.Bacca, N.Barnea, B.Carlsson, C.Drischler, K.Hebeler, M.Hjorth-Jensen, M.Miorelli, G.Orlandini, A.Schwenk, J.Simonis

Neutron and weak-charge distributions of the 48Ca nucleus

NUCLEAR STRUCTURE 48Ca; calculated neutron skin parameters, radii. Ab initio calculations.

doi: 10.1038/nphys3529
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2015EK01      Phys.Rev. C 91, 051301 (2015)

A.Ekstrom, G.R.Jansen, K.A.Wendt, G.Hagen, T.Papenbrock, B.D.Carlsson, C.Forssen, M.Hjorth-Jensen, P.Navratil, W.Nazarewicz

Accurate nuclear radii and binding energies from a chiral interaction

NUCLEAR STRUCTURE 2H, 4,8He, 6,9Li, 14C, 16O, 40Ca; calculated ground-state energies, charge radii, quadrupole moment for deuteron. 6Li, 14C, 16O, 22,24F, 22,24O, 40Ca; calculated levels, J, π, charge density in 16O, scattering lengths, and effective ranges in low-energy proton-proton scattering, scattering phase shifts in low-energy neutron-proton scattering, half-life for the β- decay of 3H; deduced consistently optimized interaction from chiral EFT at NNLO for nuclei and infinite nuclear matter. Coupled-cluster calculations based on chiral effective field theory interaction (NNLOsat). Comparison with experimental data.

doi: 10.1103/PhysRevC.91.051301
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2015GA19      Phys.Rev. C 91, 064313 (2015)

L.P.Gaffney, A.P.Robinson, D.G.Jenkins, A.N.Andreyev, M.Bender, A.Blazhev, N.Bree, B.Bruyneel, P.A.Butler, T.E.Cocolios, T.Davinson, A.N.Deacon, H.De Witte, D.DiJulio, J.Diriken, A.Ekstrom, Ch.Fransen, S.J.Freeman, K.Geibel, T.Grahn, B.Hadinia, M.Hass, P.-H.Heenen, H.Hess, M.Huyse, U.Jakobsson, N.Kesteloot, J.Konki, Th.Kroll, V.Kumar, O.Ivanov, S.Martin-Haugh, D.Mucher, R.Orlandi, J.Pakarinen, A.Petts, P.Peura, P.Rahkila, P.Reiter, M.Scheck, M.Seidlitz, K.Singh, J.F.Smith, J.Van de Walle, P.Van Duppen, D.Voulot, R.Wadsworth, N.Warr, F.Wenander, K.Wimmer, K.Wrzosek-Lipska, M.Zielinska

Collectivity in the light radon nuclei measured directly via Coulomb excitation

NUCLEAR REACTIONS 109Ag, 120Sn(202Rn, 202Rn'), (204Rn, 204Rn'), E=2.845, 2.90, 2.28 MeV, [secondary 202,204Rn beams from U(p, X), E=1.4 GeV from Proton Synchrotron Booster, REX-TRAP, REX-EBIS and REX-LINAC at ISOLDE-CERN facility]; measured scattered heavy ion spectra, Eγ, Iγ, (particle)γ-coin using Miniball array. Coulomb excitation. 202,204Rn; deduced levels, E2 matrix elements, spectroscopic quadrupole moment, B(E2). GOSIA analysis of experimental data for 202,204Rn and 109Ag, 120Sn from Coulomb excitation. Comparison with state-of-the-art beyond-mean-field model calculations. Systematics of energies and transition quadrupole moments of yrast states, B(E2) and quadrupole deformation for first 2+ states in 198,200,202,204,206,208,210,212Rn.

doi: 10.1103/PhysRevC.91.064313
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2014BR05      Phys.Rev.Lett. 112, 162701 (2014)

N.Bree, K.Wrzosek-Lipska, A.Petts, A.Andreyev, B.Bastin, M.Bender, A.Blazhev, B.Bruyneel, P.A.Butler, J.Butterworth, M.P.Carpenter, J.Cederkall, E.Clement, T.E.Cocolios, A.Deacon, J.Diriken, A.Ekstrom, C.Fitzpatrick, L.M.Fraile, Ch.Fransen, S.J.Freeman, L.P.Gaffney, J.E.Garcia-Ramos, K.Geibel, R.Gernhauser, T.Grahn, M.Guttormsen, B.Hadinia, K.Hadynska-Klek, M.Hass, P.-H.Heenen, R.-D.Herzberg, H.Hess, K.Heyde, M.Huyse, O.Ivanov, D.G.Jenkins, R.Julin, N.Kesteloot, Th.Kroll, R.Krucken, A.C.Larsen, R.Lutter, P.Marley, P.J.Napiorkowski, R.Orlandi, R.D.Page, J.Pakarinen, N.Patronis, P.J.Peura, E.Piselli, P.Rahkila, E.Rapisarda, P.Reiter, A.P.Robinson, M.Scheck, S.Siem, K.Singh Chakkal, J.F.Smith, J.Srebrny, I.Stefanescu, G.M.Tveten, P.Van Duppen, J.Van de Walle, D.Voulot, N.Warr, F.Wenander, A.Wiens, J.L.Wood, M.Zielinska

Shape Coexistence in the Neutron-Deficient Even-Even 182-188Hg Isotopes Studied via Coulomb Excitation

NUCLEAR REACTIONS 120Sn, 107Ag, 112,114Cd(182Hg, 182Hg'), (184Hg, 184Hg'), (186Hg, 186Hg'), (188Hg, 188Hg'), E=2.85 MeV/nucleon; measured reaction products, Eγ, Iγ. 182,184,186,188Hg; deduced energy levels, J, π, nuclear matrix elements, B(E2). Comparison with IBM calculations, experimental data.

doi: 10.1103/PhysRevLett.112.162701
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2014EK01      Phys.Rev.Lett. 113, 262504 (2014)

A.Ekstrom, G.R.Jansen, K.A.Wendt, G.Hagen, T.Papenbrock, S.Bacca, B.Carlsson, D.Gazit

Effects of Three-Nucleon Forces and Two-Body Currents on Gamow-Teller Strengths

RADIOACTIVITY 14C, 22,24O(β-); calculated quenching factor; deduced a novel coupled-cluster technique for the computation of spectra in the daughter nuclei and made several predictions and spin assignments in the exotic neutron-rich isotopes of fluorine.

NUCLEAR STRUCTURE 14N, 22,24F; calculated energy levels, J, π.

doi: 10.1103/PhysRevLett.113.262504
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2014HA01      Phys.Rev. C 89, 014319 (2014)

G.Hagen, T.Papenbrock, A.Ekstrom, K.A.Wendt, G.Baardsen, S.Gandolfi, M.Hjorth-Jensen, C.J.Horowitz

Coupled-cluster calculations of nucleonic matter

NUCLEAR STRUCTURE A=10-1000; N=66, 132; calculated relative finite-size corrections for the kinetic energy in pure neutron matter, E/A of nuclear and neutron matter. Coupled-cluster computations of equation of state (EoS) for symmetric nuclear matter and neutron matter using optimized nucleon-nucleon (NN) potential NNLOopt at next-to-next-to leading order. Comparison with benchmark calculations.

doi: 10.1103/PhysRevC.89.014319
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2014IL01      Phys.Rev. C 89, 014313 (2014)

S.Ilieva, M.Thurauf, Th.Kroll, R.Krucken, T.Behrens, V.Bildstein, A.Blazhev, S.Bonig, P.A.Butler, J.Cederkall, T.Davinson, P.Delahaye, J.Diriken, A.Ekstrom, F.Finke, L.M.Fraile, S.Franchoo, Ch.Fransen, G.Georgiev, R.Gernhauser, D.Habs, H.Hess, A.M.Hurst, M.Huyse, O.Ivanov, J.Iwanicki, P.Kent, O.Kester, U.Koster, R.Lutter, M.Mahgoub, D.Martin, P.Mayet, P.Maierbeck, T.Morgan, O.Niedermeier, M.Pantea, P.Reiter, T.R.Rodriguez, Th.Rolke, H.Scheit, A.Scherillo, D.Schwalm, M.Seidlitz, T.Sieber, G.S.Simpson, I.Stefanescu, S.Thiel, P.G.Thirolf, J.Van de Walle, P.Van Duppen, D.Voulot, N.Warr, W.Weinzierl, D.Weisshaar, F.Wenander, A.Wiens, S.Winkler

Coulomb excitation of neutron-rich Cd isotopes

NUCLEAR REACTIONS 108Pd(122Cd, 122Cd'), 64Zn, 104Pd(124Cd, 124Cd'), 64Zn(126Cd, 126Cd'), E=2.85 MeV/nucleon, [secondary 122,124,126Cd beams from 238U(p, X), E=1.2 GeV primary reaction]; measured Eγ, Iγ, particle spectra, γγ-, (particle)γ-coin, γ-ray yields, γ(θ), σ(θ), half-life of first 2+ state of 126Cd by DSAM using REXTRAP and EBIS setup, Miniball array for γ rays and DSSDs for particle detection at REX-ISOLDE-CERN facility. 122,124,126Cd; deduced levels, Coulomb-excitation σ, transition and diagonal matrix elements, static quadrupole moments, and B(E2) for first 2+ states. Comparison with shell model and beyond mean field calculations. Discussed onset of collectivity in the vicinity of Z=50 and N=82 shell closures. Systematics of experimental and theoretical values of B(E2) for first 2+ states in A=116-130 even Cd isotopes.

doi: 10.1103/PhysRevC.89.014313
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2013BA57      Phys.Rev. C 88, 051301 (2013)

V.M.Bader, A.Gade, D.Weisshaar, B.A.Brown, T.Baugher, D.Bazin, J.S.Berryman, A.Ekstrom, M.Hjorth-Jensen, S.R.Stroberg, W.B.Walters, K.Wimmer, R.Winkler

Quadrupole collectivity in neutron-deficient Sn nuclei: 104Sn and the role of proton excitations

NUCLEAR REACTIONS 197Au(104Sn, 104Sn'), (102Cd, 102Cd'), [102Cd, 104Sn secondary beams from 9Be(124Xe, X), E=140 MeV/nucleon primary reaction], E=67 MeV/nucleon for 104Sn and 64 MeV/nucleon for 102Cd; measured scattered particle spectra, Eγ, Iγ, (particle)γ-coin using A1900 fragment separator, Si p-i-n detector and TOF for particles and CAESAR array of scintillation detectors for γ rays at NSCL-MSU facility. 104Sn; deduced level, B(E2) for first 2+ state relative to that for 102Cd. Comparison with previous experimental results, and with large-scale shell model calculations. Enhanced quadrupole collectivity. Systematics of B(E2) values for A=104 to 130 even-A Sn nuclei.

doi: 10.1103/PhysRevC.88.051301
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2013BA58      Phys.Rev. C 88, 054312 (2013)

G.Baardsen, A.Ekstrom, G.Hagen, M.Hjorth-Jensen

Coupled-cluster studies of infinite nuclear matter

doi: 10.1103/PhysRevC.88.054312
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2013DI01      Phys.Rev. C 87, 017301 (2013)

D.D.DiJulio, J.Cederkall, C.Fahlander, A.Ekstrom, M.Hjorth-Jensen, M.Albers, V.Bildstein, A.Blazhev, I.Darby, T.Davinson, H.De Witte, J.Diriken, Ch.Fransen, K.Geibel, R.Gernhauser, A.Gorgen, H.Hess, K.Heyde, J.Iwanicki, R.Lutter, P.Reiter, M.Scheck, M.Seidlitz, S.Siem, J.Taprogge, G.M.Tveten, J.Van de Walle, D.Voulot, N.Warr, F.Wenander, K.Wimmer

Coulomb excitation of 107In

NUCLEAR REACTIONS 58Ni(107In, 107In'), (107Sn, 107Sn'), [107In and 107Sn secondary beams from LaCx(p, X), E=1.4 GeV primary reaction], E=2.87 MeV/nucleon; measured Eγ, Iγ, scattered particle spectra, (particle)γ-coin, B(E2) using REX-ISOLDE, MINIBALL Ge array facility at CERN. 107In; deduced levels, J, π, B(E2). GOSIA2 analysis for Coulomb excitation. 58Ni; measured Eγ, Iγ, used known B(E2) for first 2+ state for normalization of data for 107In. Comparison with experimental B(E2) values for 113,115In, and with large-scale shell model calculations. 107Sn; observed γ ray spectrum.

doi: 10.1103/PhysRevC.87.017301
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2013EK01      Phys.Rev.Lett. 110, 192502 (2013)

A.Ekstrom, G.Baardsen, C.Forssen, G.Hagen, M.Hjorth-Jensen, G.R.Jansen, R.Machleidt, W.Nazarewicz, T.Papenbrock, J.Sarich, S.M.Wild

Optimized Chiral Nucleon-Nucleon Interaction at Next-to-Next-to-Leading Order

NUCLEAR STRUCTURE 3H, 3,4He, 10B, 17,22,24O, 40,48,50,52,54,56Ca; calculated energy of the first 2+ state, energy per nucleon for neutron matter, phase shifts. The nucleon-nucleon interaction from chiral effective field theory at next-to-next-to-leading order (NNLO).

doi: 10.1103/PhysRevLett.110.192502
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2013MO11      Phys.Rev. C 87, 044326 (2013)

S.N.More, A.Ekstrom, R.J.Furnstahl, G.Hagen, T.Papenbrock

Universal properties of infrared oscillator basis extrapolations

doi: 10.1103/PhysRevC.87.044326
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2012BA40      Phys.Rev. C 86, 034310 (2012)

C.Bauer, T.Behrens, V.Bildstein, A.Blazhev, B.Bruyneel, J.Butterworth, E.Clement, L.Coquard, J.L.Egido, A.Ekstrom, C.R.Fitzpatrick, C.Fransen, R.Gernhauser, D.Habs, H.Hess, J.Leske, T.Kroll, R.Krucken, R.Lutter, P.Marley, T.Moller, T.Otsuka, N.Patronis, A.Petts, N.Pietralla, T.R.Rodriguez, N.Shimizu, C.Stahl, I.Stefanescu, T.Stora, P.G.Thirolf, D.Voulot, J.van de Walle, N.Warr, F.Wenander, A.Wiens

Prolate shape of 140Ba from a first combined Doppler-shift and Coulomb-excitation measurement at the REX-ISOLDE facility

NUCLEAR REACTIONS 96Mo(140Ba, 140Ba'), [140Ba secondary beam from U(p, X), E=1.4 GeV primary beam], E=392 MeV; measured Eγ, Iγ, (particle)γ-coin, yields in different angular ranges, differential σ(θ), half-life of first 2+ state by DSAM using REX-ISOLDE and MINIBALL setup at ISOLDE-CERN. 140Ba; deduced level, E2 matrix element, B(E2), and static quadrupole moment of first 2+ state. Z=56, A=130=146; systematics of energies and B(E2) of first 2+ states. Comparison with Monte Carlo shell-model approach and beyond-mean-field calculations. Gogny energy density functionals and distribution of probability contours in the triaxial (β, γ) plane for 0+, 2+ and 4+ states first two bands.

NUCLEAR MOMENTS 140Ba; measured static quadrupole moment of first 2+ state by reorientation analysis of Coulomb-excitation yields.

doi: 10.1103/PhysRevC.86.034310
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2012DI12      Eur.Phys.J. A 48, 105 (2012)

D.D.DiJulio, J.Cederkall, C.Fahlander, A.Ekstrom, M.Hjorth-Jensen, M.Albers, V.Bildstein, A.Blazhev, I.Darby, T.Davinson, H.De Witte, J.Diriken, Ch.Fransen, K.Geibel, R.Gernhauser, A.Gorgen, H.Hess, J.Iwanicki, R.Lutter, P.Reiter, M.Scheck, M.Seidlitz, S.Siem, J.Taprogge, G.M.Tveten, J.Van de Walle, D.Voulot, N.Warr, F.Wenander, K.Wimmer

Coulomb excitation of 107Sn

NUCLEAR REACTIONS 58Ni(107Sn, 107Sn'), E=2.87 MeV/nucleon; measured Coulomb excitation Eγ, Iγ using HPGe MINIBALL detector array, particles using DSSSD (double-sided Si strip detector), γ(Ni)-coin. 107,109Sn deduced levels, J, π, γ transitions, B(E2), B(M1) using GOSIA2 code; calculated levels, J, π, γ transitions, B(E2) using shell model.

doi: 10.1140/epja/i2012-12105-7
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2012DI13      Phys.Rev. C 86, 031302 (2012)

D.D.DiJulio, J.Cederkall, C.Fahlander, A.Ekstrom, M.Hjorth-Jensen, M.Albers, V.Bildstein, A.Blazhev, I.Darby, T.Davinson, H.De Witte, J.Diriken, Ch.Fransen, K.Geibel, R.Gernhauser, A.Gorgen, H.Hess, J.Iwanicki, R.Lutter, P.Reiter, M.Scheck, M.Seidlitz, S.Siem, J.Taprogge, G.M.Tveten, J.Van de Walle, D.Voulot, N.Warr, F.Wenander, K.Wimmer

Excitation strengths in 109Sn: Single-neutron and collective excitations near 100Sn

NUCLEAR REACTIONS 58Ni(109Sn, 109Sn'), E=2.87 MeV/nucleon, [109Sn beam from La(p, X), E=1.4 GeV]; measured Eγ, Iγ using the MINIBALL array and REX-ISOLDE facility at CERN. 58Ni, 109Sn; deduced levels, J, π, B(E2). GOSIA2 analysis for Coulomb excitation. Comparison with shell-model calculations. Single neutron excitations relative to 100Sn core.

doi: 10.1103/PhysRevC.86.031302
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2012DI15      Phys.Scr. T150, 014012 (2012)

D.D.DiJulio, J.Cederkall, A.Ekstrom, C.Fahlander, M.Hjorth-Jensen

Shell model based Coulomb excitation γ-ray intensity calculations in 107Sn

NUCLEAR STRUCTURE 107,109Sn; calculated γ-ray yields, energy levels, J, π. Comparison with available data.

doi: 10.1088/0031-8949/2012/T150/014012
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2012DI18      J.Phys.:Conf.Ser. 381, 012073 (2012)

D.D.DiJulio, J.Cederkall, A.Ekstrom, C.Fahlander, M.Hjorth-Jensen, for the IS459 collaboration

Sub-barrier Coulomb excitation of 107Sn

NUCLEAR REACTIONS 58Ni(107Sn, 107Sn'), E=2.866 MeV/nucleon[La(p, X)107Sn, E=1.4 GeV]; measured Coulomb excitation scattered Sn, Ni nuclei using DSSSD, Doppler corrected Eγ, Iγ at REX-ISOLDE; calculated γ ray spectra using shell-model with GOSIA; deduced ordering of single-particle orbits.

doi: 10.1088/1742-6596/381/1/012073
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2011DI07      Eur.Phys.J. A 47, 25 (2011)

D.D.DiJulio, J.Cederkall, C.Fahlander, A.Ekstrom, P.Golubev, D.D.DiJulio, J.Cederkall, C.Fahlander, A.Ekstrom, P.Golubev, K.Mattsson, D.Rudolph, G.de Angelis, S.Aydin, A.Y.Deo, E.Farnea, G.Farrelly, K.Geibel, C.He, J.Iwanicki, R.Kempley, N.Marginean, R.Menegazzo, D.Mengoni, R.Orlandi, Z.Podolyak, F.Recchia, P.Reiter, E.Sahin, J.Smith, P.A.Soderstrom, D.A.Torres, G.M.Tveten, C.A.Ur, J.J.Valiente-Dobon, A.Wendt, M.Zielinska

Electromagnetic properties of vibrational bands in 170Er

NUCLEAR REACTIONS 170Er(32S, 32S'), E=117 MeV; measured reaction products, Eγ, Iγ; deduced level energies, J, π, γ-ray intensities, γ-vibrational band, E2 matrix elements. Coulomb excitation code GOSIA.

doi: 10.1140/epja/i2011-11025-4
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2011JU01      Phys.Lett. B 695, 110 (2011)

A.Jungclaus, J.Walker, J.Leske, K.-H.Speidel, A.E.Stuchbery, M.East, P.Boutachkov, J.Cederkall, P.Doornenbal, J.L.Egido, A.Ekstrom, J.Gerl, R.Gernhauser, N.Goel, M.Gorska, I.Kojouharov, P.Maier-Komor, V.Modamio, F.Naqvi, N.Pietralla, S.Pietri, W.Prokopowicz, H.Schaffner, R.Schwengner, H.-J.Wollersheim

Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements

NUCLEAR REACTIONS C, Gd, Cu(112Sn, 112Sn'), (114Sn, 114Sn'), (116Sn, 116Sn'), (118Sn, 118Sn'), (120Sn, 120Sn'), (122Sn, 122Sn'), (124Sn, 124Sn'), E=4 MeV/nucleon; measured Eγ, Iγ, particle-γ coin. 112,114,116,118,120,122,124Sn; deduced energy levels, lifetimes, B(E2). Comparison with shell model calculations.

doi: 10.1016/j.physletb.2010.11.012
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2011JU06      J.Phys.:Conf.Ser. 312, 092033 (2011)

A.Jungclaus, J.Walker, J.Leske, K.-H.Speidel, A.E.Stuchbery, M.East, P.Boutachkov, J.Cederkall, P.Doornenbal, J.L.Egido, A.Ekstrom, J.Gerl, R.Gernhauser, N.Goel, M.Gorska, I.Kojouharov, P.Maier-Komor, V.Modamio, F.Naqvi, N.Pietralla, S.Pietri, W.Prokopowicz, H.Schaffner, R.Schwengner, H.-J.Wollersheim

New lifetime measurements in the stable semimagic Sn isotopes using the Doppler-shift attenuation technique

NUCLEAR REACTIONS C, Cu, Gd, Ta(112Sn, 112Sn'), (114Sn, 114Sn'), (116Sn, 116Sn'), E=4.0 MeV/nucleon;C, Cu, Gd, Ta(122Sn, 122Sn'), E=3.8 Mev/nucleon; measured Coulomb excitation Eγ, Iγ, (particle)γ-coin, (particle)(particle)-coin using Doppler-shift attenuation; deduced B(E2). Compared to other data; also deduced T1/2, but the values not given here.

doi: 10.1088/1742-6596/312/9/092033
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2011KU05      Acta Phys.Pol. B42, 813 (2011)

R.Kumar, P.Doornenbal, A.Jhingan, R.K.Bhowmik, S.Appannababu, P.Bednarczyk, L.Caceres, J.Cederkall, A.Ekstrom, R.Garg, J.Gerl, M.Gorska, H.Grawe, J.Kaur, I.Kojouharov, S.Mandal, S.Mukherjee, S.Muralithar, W.Prokopowicz, P.P.Singh, P.Reiter, H.Schaffner, A.Sharma, R.P.Singh, D.Siwal, H.J.Wollersheim

Enhanced 0+g.s. → 2+1 E2 Transition Strength in 112, 114Sn

NUCLEAR REACTIONS 58Ni(114Sn, 114Sn'), (116Sn, 116Sn'), E=3.4 MeV/nucleon; measured Eγ, Iγ, particle-γ-coin. 112,114Sn; deduced B(E2). Comparison with RQRPA calculations.

doi: 10.5506/APhysPolB.42.813
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2011SE05      Phys.Lett. B 700, 181 (2011)

M.Seidlitz, D.Mucher, P.Reiter, V.Bildstein, A.Blazhev, N.Bree, B.Bruyneel, J.Cederkall, E.Clement, T.Davinson, P.Van Duppen, A.Ekstrom, F.Finke, L.M.Fraile, K.Geibel, R.Gernhauser, H.Hess, A.Holler, M.Huyse, O.Ivanov, J.Jolie, M.Kalkuhler, T.Kotthaus, R.Krucken, R.Lutter, E.Piselli, H.Scheit, I.Stefanescu, J.Van de Walle, D.Voulot, N.Warr, F.Wenander, A.Wiens

Coulomb excitation of 31Mg

NUCLEAR REACTIONS 109Ag(31Mg, 31Mg'), E=3 MeV/nucleon; measured reaction products, Eγ, Iγ. 31Mg; deduced energy levels, J, π, B(E2), B(M1). Comparison with theoretical predictions.

doi: 10.1016/j.physletb.2011.05.009
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2011WA15      Phys.Rev. C 84, 014319 (2011)

J.Walker, A.Jungclaus, J.Leske, K.-H.Speidel, A.Ekstrom, P.Boutachkov, J.Cederkall, P.Doornenbal, J.Gerl, R.Gernhauser, N.Goel, M.Gorska, I.Kojouharov, P.Maier-Komor, V.Modamio, F.Naqvi, N.Pietralla, S.Pietri, W.Prokopowicz, H.Schaffner, R.Schwengner, H.-J.Wollersheim

Magnetic moments of the first excited 2+ states in the semi-magic 112, 114, 116, 122, 124Sn isotopes

NUCLEAR MOMENTS 112,114,116,122,124Sn; measured g factors of the first 2+, 4+ and 3- states by transient field technique in Coulomb excitation in inverse kinematics. Comparisons with shell-model and other theoretical calculations.

NUCLEAR REACTIONS 12C(112Sn, 112Sn'), (114Sn, 114Sn'), (116Sn, 116Sn'), E=4 MeV/nucleon; 12C(122Sn, 122Sn'), (124Sn, 124Sn'), E=3.8 MeV/nucleon; measured Eγ, Iγ, (12C)γ-coin, (12C)γγ(θ), precession angles. 112,114,116,122,124Sn; deduced g-factors, configurations. Comparison with RQRPA, QRPA, and shell-model calculations. 12C(124Sn, X)130Xe/126Te/128Te, E=3.8 MeV/nucleon; measured Eγ, Iγ.

doi: 10.1103/PhysRevC.84.014319
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2010DI14      Phys.Rev. C 82, 064309 (2010)

J.Diriken, I.Stefanescu, D.Balabanski, N.Blasi, A.Blazhev, N.Bree, J.Cederkall, T.E.Cocolios, T.Davinson, J.Eberth, A.Ekstrom, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, S.Franchoo, G.Georgiev, K.Gladnishki, M.Huyse, O.V.Ivanov, V.S.Ivanov, J.Iwanicki, J.Jolie, T.Konstantinopoulos, Th.Kroll, R.Krucken, U.Koster, A.Lagoyannis, G.Lo Bianco, P.Maierbeck, B.A.Marsh, P.Napiorkowski, N.Patronis, D.Pauwels, P.Reiter, M.Seliverstov, G.Sletten, J.Van de Walle, P.Van Duppen, D.Voulot, W.B.Walters, N.Warr, F.Wenander, K.Wrzosek

Coulomb excitation of 73Ga

NUCLEAR REACTIONS 104Pd(71Ga, 71Ga'), 120Sn(73Ga, 73Ga'), E=2.95 MeV/nucleon, [secondary 71,73Ga beams from U(p, X), E=1 GeV]; measured Eγ, Iγ, (particle)γ-, γγ-coin at REX-ISOLDE. 71Ga, 73Ga; deduced levels, J, π, B(E2). Comparison with level systematics of 63,65,67,69,71,73,75,77Ga. Collectivity due to g9/2 neutron orbital.

RADIOACTIVITY 73Zn(β-)[from U(p, X), E=1 GeV]; measured Eγ.

doi: 10.1103/PhysRevC.82.064309
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2010EK01      Eur.Phys.J. A 44, 355 (2010)

A.Ekstrom, J.Cederkall, C.Fahlander, M.Hjorth-Jensen, T.Engeland, A.Blazhev, P.A.Butler, T.Davinson, J.Eberth, F.Finke, A.Gorgen, M.Gorska, A.M.Hurst, O.Ivanov, J.Iwanicki, U.Koster, B.A.Marsh, J.Mierzejewski, P.Reiter, S.Siem, G.Sletten, I.Stefanescu, G.M.Tveten, J.Van de Walle, D.Voulot, N.Warr, D.Weisshaar, F.Wenander, M.Zielinska

Coulomb excitation of the odd-odd isotopes 106, 108In

NUCLEAR REACTIONS 58Ni(106In, 106In'), (108In, 108In'), E=2.8 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin following Coulomb excitation at the REX-ISOLDE facility. 106,108In; deduced levels, J, π, B(E2); calculated low-lying level properties, E2, M1 matrix elements using shell model plus coupled channels.

doi: 10.1140/epja/i2010-10945-7
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2009EK01      Phys.Rev. C 80, 054302 (2009)

A.Ekstrom, J.Cederkall, D.D.DiJulio, C.Fahlander, M.Hjorth-Jensen, A.Blazhev, B.Bruyneel, P.A.Butler, T.Davinson, J.Eberth, C.Fransen, K.Geibel, H.Hess, O.Ivanov, J.Iwanicki, O.Kester, J.Kownacki, U.Koster, B.A.Marsh, P.Reiter, M.Scheck, B.Siebeck, S.Siem, I.Stefanescu, H.K.Toft, G.M.Tveten, J.Van de Walle, D.Voulot, N.Warr, D.Weisshaar, F.Wenander, K.Wrzosek, M.Zielinska

Electric quadrupole moments of the 2+1 states in 100, 102, 104Cd

NUCLEAR REACTIONS 109Ag(100Cd, 100Cd'), E=287.0 MeV; 64Zn, 109Ag(102Cd, 102Cd'), E=292.7 MeV; 64Zn, 109Ag(104Cd, 104Cd'), E=298.7 MeV; measured Eγ, Iγ, γ(particle)-coin, and γ-ray yields using REX-ISOLDE facility. 64Zn, 100,102,104Cd, 109Ag; deduced levels, J, π, E2 matrix elements, electric quadrupole moments. Comparison with shell model calculations.

NUCLEAR MOMENTS 100,102,104Cd; measured electric quadrupole moments of first 2+ states using reorientation method in Coulomb excitation. Comparison with shell model calculations.

doi: 10.1103/PhysRevC.80.054302
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2009VA01      Phys.Rev. C 79, 014309 (2009)

J.Van de Walle, F.Aksouh, T.Behrens, V.Bildstein, A.Blazhev, J.Cederkall, E.Clement, T.E.Cocolios, T.Davinson, P.Delahaye, J.Eberth, A.Ekstrom, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, S.Franchoo, R.Gernhauser, G.Georgiev, D.Habs, K.Heyde, G.Huber, M.Huyse, F.Ibrahim, O.Ivanov, J.Iwanicki, J.Jolie, O.Kester, U.Koster, T.Kroll, R.Krucken, M.Lauer, A.F.Lisetskiy, R.Lutter, B.A.Marsh, P.Mayet, O.Niedermaier, M.Pantea, R.Raabe, P.Reiter, M.Sawicka, H.Scheit, G.Schrieder, D.Schwalm, M.D.Seliverstov, T.Sieber, G.Sletten, N.Smirnova, M.Stanoiu, I.Stefanescu, J.-C.Thomas, J.J.Valiente-Dobon, P.Van Duppen, D.Verney, D.Voulot, N.Warr, D.Weisshaar, F.Wenander, B.H.Wolf, M.Zielinska

Low-energy Coulomb excitation of neutron-rich zinc isotopes

NUCLEAR REACTIONS 120Sn(74Zn, 74Zn'), E=2.87 MeV/nucleon; 120Sn(76Zn, 76Zn'), E=2.83 MeV/nucleon; 108Pd(78ZN, 78Zn'), E=2.87 MeV/nucleon; 108Pd(80Zn, 80Zn'), E=2.79 MeV/nucleon; measured Eγ, Iγ, charged particle spectra, (particle)-γ coin, measured half-lives of first 2+ state, B(E2). 74,76,78,80Zn, 80Ga, 80Rb, 108Pd, 120Sn; deduced levels. Fe, Ni, Zn, Ge, Se; systematics of B(E2) values. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.79.014309
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2009VA16      Eur.Phys.J. A 42, 401 (2009)

J.Van de Walle, V.Bildstein, N.Bree, J.Cederkall, P.Delahaye, J.Diriken, A.Ekstrom, V.N.Fedosseev, R.Gernhauser, A.Gustafsson, A.Herlert, M.Huyse, O.Ivanov, T.Kroll, R.Krucken, B.Marsh, N.Partronis, P.Van Duppen, D.Voulot, N.Warr, F.Wenander, K.Wimmer, S.M.Lenzi

In-trap decay of 61Mn and Coulomb excitation of 61Mn/61Fe

NUCLEAR REACTIONS 109Ag(61Mn, 61Mn'), (61Fe, 61Fe'), E=2.87 MeV/nucleon; measured Eγ, Iγ following Coulomb excitation at the REX-ISOLDE facility and in-trap decay. 61Mn, 61Fe; deduced levels T1/2, B(E2), B(M1). Comparison with large-scale shell model calculations.

doi: 10.1140/epja/i2009-10814-6
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2008DO19      Phys.Rev. C 78, 031303 (2008)

P.Doornenbal, P.Reiter, H.Grawe, H.J.Wollersheim, P.Bednarczyk, L.Caceres, J.Cederkall, A.Ekstrom, J.Gerl, M.Gorska, A.Jhingan, I.Kojouharov, R.Kumar, W.Prokopowicz, H.Schaffner, R.P.Singh

Enhanced strength of the 2+1 → 0+g.s. transition in 114Sn studied via Coulomb excitation in inverse kinematics

NUCLEAR REACTIONS 58Ni(114Sn, 114Sn'), (116Sn, 116Sn'), E=3.4 MeV/nucleon; measured Eγ, Iγ. 114,116Sn; deduced B(E2). Comparison with large-scale shell model calculations and B(E2) for even-even Tin isotopes. Coulomb excitation.

doi: 10.1103/PhysRevC.78.031303
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2008EK01      Phys.Rev.Lett. 101, 012502 (2008)

A.Ekstrom, J.Cederkall, C.Fahlander, M.Hjorth-Jensen, F.Ames, P.A.Butler, T.Davinson, J.Eberth, F.Fincke, A.Gorgen, M.Gorska, D.Habs, A.M.Hurst, M.Huyse, O.Ivanov, J.Iwanicki, O.Kester, U.Koster, B.A.Marsh, J.Mierzejewski, P.Reiter, H.Scheit, D.Schwalm, S.Siem, G.Sletten, I.Stefanescu, G.M.Tveten, J.Van de Walle, P.Van Duppen, D.Voulot, N.Warr, D.Weisshaar, F.Wenander, M.Zielinska

0+gs → 2+1 Transition Strengths in 106Sn and 108Sn

NUCLEAR REACTIONS 58Ni(106Sn, X), E=2.83 MeV/nucleon; 58Ni(108Sn, X), E=2.82 MeV/nucleon; measured Eγ, Iγ following coulomb excitations.106,108Sn; deduced B(E2).

doi: 10.1103/PhysRevLett.101.012502
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2008ST04      Phys.Rev.Lett. 100, 112502 (2008)

I.Stefanescu, G.Georgiev, D.L.Balabanski, N.Blasi, A.Blazhev, N.Bree, J.Cederkall, T.E.Cocolios, T.Davinson, J.Diriken, J.Eberth, A.Ekstrom, D.Fedorov, V.N.Fedosseev, L.M.Fraile, S.Franchoo, K.Gladnishki, M.Huyse, O.Ivanov, V.Ivanov, J.Iwanicki, J.Jolie, T.Konstantinopoulos, Th.Kroll, R.Krucken, U.Koster, A.Lagoyannis, G.Lo Bianco, P.Maierbeck, B.A.Marsh, P.Napiorkowski, N.Patronis, D.Pauwels, G.Rainovski, P.Reiter, K.Riisager, M.Seliverstov, G.Sletten, J.Van de Walle, P.Van Duppen, D.Voulot, N.Warr, F.Wenander, K.Wrzosek

Interplay between Single-Particle and Collective Effects in the Odd-A Cu Isotopes beyond N = 40

NUCLEAR REACTIONS 104Pd(67Cu, 67Cu'), (69Cu, 69Cu'), (71Cu, 71Cu'), E=2.99 MeV/nucleon; 120Sn(71Cu, 71Cu'), (73Cu, 73Cu'), E=2.99 MeV/nucleon; measured Eγ, Iγ following coulomb excitation. 67,69,71,73Cu; deduced level energies, B(E2).

doi: 10.1103/PhysRevLett.100.112502
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2007CE02      Phys.Rev.Lett. 98, 172501 (2007)

J.Cederkall, A.Ekstrom, C.Fahlander, A.M.Hurst, M.Hjorth-Jensen, F.Ames, A.Banu, P.A.Butler, T.Davinson, U.Datta Pramanik, J.Eberth, S.Franchoo, G.Georgiev, M.Gorska, D.Habs, M.Huyse, O.Ivanov, J.Iwanicki, O.Kester, U.Koster, B.A.Marsh, O.Niedermaier, T.Nilsson, P.Reiter, H.Scheit, D.Schwalm, T.Sieber, G.Sletten, I.Stefanescu, J.Van de Walle, P.Van Duppen, N.Warr, D.Weisshaar, F.Wenander

Sub-Barrier Coulomb Excitation of 110Sn and Its Implications for the 100Sn Shell Closure

NUCLEAR REACTIONS 58Ni(110Sn, 110Sn'), E=2.82 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin following Coulomb excitation. 110Sn deduced B(E2) of the first excited 2+ state. MINIBALL array at REX-ISOLDE.

doi: 10.1103/PhysRevLett.98.172501
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2007HU03      Phys.Rev.Lett. 98, 072501 (2007)

A.M.Hurst, P.A.Butler, D.G.Jenkins, P.Delahaye, F.Wenander, F.Ames, C.J.Barton, T.Behrens, A.Burger, J.Cederkall, E.Clement, T.Czosnyka, T.Davinson, G.de Angelis, J.Eberth, A.Ekstrom, S.Franchoo, G.Georgiev, A.Gorgen, R.-D.Herzberg, M.Huyse, O.Ivanov, J.Iwanicki, G.D.Jones, P.Kent, U.Koster, T.Kroll, R.Krucken, A.C.Larsen, M.Nespolo, M.Pantea, E.S.Paul, M.Petri, H.Scheit, T.Sieber, S.Siem, J.F.Smith, A.Steer, I.Stefanescu, N.U.H.Syed, J.Van de Walle, P.Van Duppen, R.Wadsworth, N.Warr, D.Weisshaar, M.Zielinska

Measurement of the Sign of the Spectroscopic Quadrupole Moment for the 2+1 State in 70Se: No Evidence for Oblate Shape

NUCLEAR REACTIONS 104Pd(70Se, 70Se'), E=206 MeV; measured Eγ, Iγ, (particle)γ-coin following projectile Coulomb excitation. 70Se deduced prolate deformation.

doi: 10.1103/PhysRevLett.98.072501
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2007KR19      Eur.Phys.J. Special Topics 150, 127 (2007)

Th.Kroll, T.Behrens, R.Krucken, V.Bildstein, R.Gernhauser, P.Maierbeck, I.Stefanescu, O.Ivanov, J.Van de Walle, N.Warr, P.A.Butler, J.Cederkall, P.Delahaye, L.M.Fraile, G.Georgiev, U.Koster, T.Sieber, D.Voulot, F.Wenander, P.E.Kent, A.Ekstrom, K.-H.Speidel, J.Leske, S.Schielke, D.Habs, R.Lutter, P.Thirolf, H.Scheit, T.Davinson, and the REX-ISOLDE and MINIBALL Collaboration

Coulomb excitation of neutron-rich 138, 140, 142Xe at REX-ISOLDE

NUCLEAR REACTIONS 96Mo(138Xe, 138Xe'), (140Xe, 140Xe'), (142Xe, 142Xe'), E=2.84 MeV/nucleon; measured Eγ, Iγ. 138,140,142Xe; deduced B(E2).

doi: 10.1140/epjst/e2007-00284-6
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2007VA20      Phys.Rev.Lett. 99, 142501 (2007)

J.Van de Walle, F.Aksouh, F.Ames, T.Behrens, V.Bildstein, A.Blazhev, J.Cederkall, E.Clement, T.E.Cocolios, T.Davinson, P.Delahaye, J.Eberth, A.Ekstrom, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, S.Franchoo, R.Gernhauser, G.Georgiev, D.Habs, K.Heyde, G.Huber, M.Huyse, F.Ibrahim, O.Ivanov, J.Iwanicki, J.Jolie, O.Kester, U.Koster, T.Kroll, R.Krucken, M.Lauer, A.F.Lisetskiy, R.Lutter, B.A.Marsh, P.Mayet, O.Niedermaier, T.Nilsson, M.Pantea, O.Perru, R.Raabe, P.Reiter, M.Sawicka, H.Scheit, G.Schrieder, D.Schwalm, M.D.Seliverstov, T.Sieber, G.Sletten, N.Smirnova, M.Stanoiu, I.Stefanescu, J.-C.Thomas, J.J.Valiente-Dobon, P.Van Duppen, D.Verney, D.Voulot, N.Warr, D.Weisshaar, F.Wenander, B.H.Wolf, M.Zielinska

Coulomb Excitation of Neutron-Rich Zn Isotopes: First Observation of the 2+1 State in 80Zn

NUCLEAR REACTIONS 108Pd, 120Sn(74Zn, 74Zn'), (76Zn, 76Zn'), (78Zn, 78Zn'), (80Zn, 80Zn'), E=2.79-2.87 MeV/nucleon; measured Eγ, Iγ. 74,76,78,80Zn deduced B(E2).

doi: 10.1103/PhysRevLett.99.142501
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2006EK01      Phys.Scr. T125, 190 (2006)

A.Ekstrom, J.Cederkall, A.Hurst, C.Fahlander, A.Banu, P.Butler, J.Eberth, M.Gorska, D.Habs, M.Huyse, O.Kester, O.Niedermaier, T.Nilsson, M.Pantea, H.Scheit, D.Schwalm, G.Sletten, D.P.Ushasi, P.van Duppen, N.Warr, D.Weisshaar, and the IS418/REX-ISOLDE/ISOLDE Collaborations

Coulomb excitation of 110Sn using REX-ISOLDE

NUCLEAR REACTIONS 58Ni(110Sn, 110Sn'), E=2.8 MeV/nucleon; measured Eγ, Iγ, (particle)γ-coin following projectile Coulomb excitation. 110Sn deduced transition B(E2).

doi: 10.1088/0031-8949/2006/T125/045
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