NSR Query Results
Output year order : Descending NSR database version of March 21, 2024. Search: Author = A.Umeya Found 19 matches. 2020HI12 J.Phys.(London) G47, 035102 (2020) K.Higashiyama, K.Yanase, N.Yoshinaga, A.Umeya, A.Uehara, E.Teruya Nuclear matrix elements of neutrinoless double beta decay for masses 130 and 136 in the shell model RADIOACTIVITY 130Te, 136Xe(2β-); calculated nuclear matrix elements of neutrinoless double beta decay using the nuclear shell model.
doi: 10.1088/1361-6471/ab5400
2016UM02 Nucl.Phys. A954, 242 (2016) Theoretical study of structure and production of 19ΛF as a gateway to sd-shell hypernuclei NUCLEAR STRUCTURE 18,19F, 19F Λ hypernucleus; calculated levels, J, π, spectroscopic factors of neutron pickup from 19F gs using multi-configuration shell model with and without removing spurious CM (Center-of-Mass) excitation effect. 18F, 19F Λ hypernucleus; calculated γ transitions B(E1), B(M1), B(E2). Spectroscopic factors, γ transition strengths, levels compared to data. NUCLEAR REACTIONS 19F(K-, π-), E at 0.3-1.8 GeV/c; calculated 19F Λ hypernuclear production σ, σ(θ), σ(θ, E) to low-lying states, Λ polarization vs kaon momentum using microscopic DWIA and assuming K-+n to Λ+π- as the main process.
doi: 10.1016/j.nuclphysa.2016.05.001
2016UM03 Nucl.Phys. A955, 194 (2016) Roles of NN-interaction components in shell-structure evolution NUCLEAR STRUCTURE 16O, 20Ne, 24Mg, 28Si, 32S, 36Ar, 40Ca; calculated sp energy, spin-orbit energy splitting using shell model with and without tensor, spin-orbit and ALS interactions with multipole expansion.
doi: 10.1016/j.nuclphysa.2016.06.011
2015MY01 Prog.Theor.Exp.Phys. 2015, 063D03 (2015) T.Myo, A.Umeya, H.Toki, K.Ikeda Structures in 9, 10Be and 10B studied with the tensor-optimized shell model NUCLEAR STRUCTURE 8,9,10Be, 10B; calculated excitation energies, J, π, rms radii, nucleon occupation numbers. Comparison with experimental data.
doi: 10.1093/ptep/ptv077
2014MY02 Prog.Theor.Exp.Phys. 2014, 033D01 (2014) T.Myo, A.Umeya, K.Horii, H.Toki, K.Ikeda Shell and alpha cluster structures in 8Be with tensor-optimized shell model NUCLEAR STRUCTURE 8Be; calculated occupation numbers, J, π, energy levels. Tensor-optimized shell model (TOSM).
doi: 10.1093/ptep/ptu012
2013HA26 Nucl.Phys. A914, 85c (2013) T.Harada, Y.Hirabayashi, A.Umeya Hypernuclear ΛΛ production by (K-, K+) reactions and the ΛΛΞ mixing in hypernuclei
doi: 10.1016/j.nuclphysa.2013.01.020
2013UM01 Few-Body Systems 54, 99 (2013) A.Umeya, T.Myo, E.Hiyama, H.Toki, K.Ikeda s-Shell Λ-Hypernuclei Taking into Account ΛN - ΛN Coupling Explicitly with TOSM NUCLEAR STRUCTURE 4H, 5He; calculated hypernuclei energy levels, J, π, Λ separation energies. Comparison with available data.
doi: 10.1007/s00601-012-0336-z
2012MY03 Phys.Rev. C 86, 024318 (2012) T.Myo, A.Umeya, H.Toki, K.Ikeda Tensor-optimized shell model for the Li isotopes with a bare nucleon-nucleon interaction NUCLEAR STRUCTURE 4,5,6,7,8He, 5,6,7,8,9Li; calculated levels, J, π, matter radius, energy components, configurations, occupation numbers. Tensor-optimized shell-model using AV8' interaction and unitary correlation operator method (TOSM+UCOM). The jj coupling character in the ground states of 7,8,9Li. Comparison with experimental data.
doi: 10.1103/PhysRevC.86.024318
2011MY02 Phys.Rev. C 84, 034315 (2011) T.Myo, A.Umeya, H.Toki, K.Ikeda Role of the tensor interaction in He isotopes with a tensor-optimized shell model NUCLEAR STRUCTURE 4,5,6,7,8He; calculated levels, J, π, configurations, matter radii, kinetic, central, tensor, and LS energy components in the configurations. Tensor-optimized shell model (TOSM) with AV8' interaction, unitary correlation operator method (UCOM). Comparison with experimental data.
doi: 10.1103/PhysRevC.84.034315
2011UM01 Phys.Rev. C 83, 034310 (2011) Doublet-spacing enhancement caused by ΛN-ΣN coupling in ΛLi hypernuclear isotopes NUCLEAR STRUCTURE 7,8,9,10Li; calculated hypernuclear levels, J, π, energy spacing of ground state doublets, energy shifts, mixing probabilities using Shell Model calculations with Fermi- and Gamow-Teller-type ΛN-ΣN coupling effects.
doi: 10.1103/PhysRevC.83.034310
2010UM03 Nucl.Phys. A835, 426c (2010) Shell-model study of Σ-mixing in neutron-rich ΛLi hypernuclei NUCLEAR STRUCTURE 7,8,9,10Li; calculated hypernuclei Σ-mixing probabilities, energy shifts using microscopic shell model.
doi: 10.1016/j.nuclphysa.2010.01.235
2009HA03 Phys.Rev. C 79, 014603 (2009) T.Harada, A.Umeya, Y.Hirabayashi Feasibility of extracting a Σ- admixture probability in the neutron-rich 10ΛLi hypernucleus NUCLEAR REACTIONS 10B(π-, K+)10Li, E=1.20 GeV/c; calculated particle spectra, σ(θ) for hypernuclei. Distorted wave impulse approximation.
doi: 10.1103/PhysRevC.79.014603
2009UM02 Phys.Rev. C 79, 024315 (2009) Λ-Σ coupling effect in the neutron-rich Λ hypernucleus 10ΛLi in a microscopic shell-model calculation NUCLEAR STRUCTURE 10Li; calculated Σ-mixing probabilities, energy spectra for 10Li hypernucleus;Λ-Σ coupling strengths of Σ eigenstates. Comparison with experimental energy spectrum for 9Li. Microscopic shell-model calculations.
doi: 10.1103/PhysRevC.79.024315
2009UM05 Nucl.Phys. A829, 13 (2009) Shell-model calculation of E2 effective charges: Application to carbon isotopes NUCLEAR STRUCTURE 11,12,13,14,15,16,17,18,19,20,21,22C; calculated levels, J, π, single particle energies, B(E2), effective charge, quadrupole matrix elements using a shell model. Comparison with data.
doi: 10.1016/j.nuclphysa.2009.08.004
2008UM01 Phys.Rev. C 77, 034318 (2008) A.Umeya, S.Nagai, G.Kaneko, K.Muto Monopole and quadrupole interactions in binding energies of sd-shell nuclei NUCLEAR STRUCTURE 20,28Ne, 24,28Mg, 24,26,28,30,32,34Si, 28F, 28Na, 28Al, 32S, 36Ar, 40Ca; calculated binding energies, investigated multipole and spin-tensor decompositions, monopole and quadrupole interactions.
doi: 10.1103/PhysRevC.77.034318
2008UM02 Phys.Rev. C 77, 044301 (2008) A.Umeya, G.Kaneko, T.Haneda, K.Muto Enhancement of neutron quadrupole motion beyond N = 8 NUCLEAR STRUCTURE 10,12,14,16Be, 12,14,16,18C; calculated configurations, B(E2), quadrupole matrix elements, single particle energies; deduced levels. Comparison with experimental data. Shell model.
doi: 10.1103/PhysRevC.77.044301
2006UM05 Phys.Rev. C 74, 034330 (2006) Single-particle energies in neutron-rich nuclei by shell model sum rule
doi: 10.1103/PhysRevC.74.034330
2004UM01 Phys.Rev. C 69, 024306 (2004) Triplet-even channel attraction for shell gaps NUCLEAR STRUCTURE 10He, 11Li, 12Be, 13B, 14C, 15N, 16O; calculated single-particle energies, shell gap features, contribution from triplet-even component of NN interaction.
doi: 10.1103/PhysRevC.69.024306
2003UM02 Nucl.Phys. A722, 558c (2003) Shell model study on E2 effective charges in light neutron-rich nuclei NUCLEAR STRUCTURE 6,7,8,9Li, 9Be, 10,11,12,13,14,15,17B, 11C, 14,18N, 17O; calculated quadrupole moments, isocalar and isovector effective charge.
doi: 10.1016/S0375-9474(03)01427-1
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