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NSR database version of April 11, 2024.

Search: Author = A.Umeya

Found 19 matches.

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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
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2016UM02      Nucl.Phys. A954, 242 (2016)

A.Umeya, T.Motoba

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
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2016UM03      Nucl.Phys. A955, 194 (2016)

A.Umeya, K.Muto

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
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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
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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
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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
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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
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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
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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
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2011UM01      Phys.Rev. C 83, 034310 (2011)

A.Umeya, T.Harada

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
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2010UM03      Nucl.Phys. A835, 426c (2010)

A.Umeya, T.Harada

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
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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
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2009UM02      Phys.Rev. C 79, 024315 (2009)

A.Umeya, T.Harada

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
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2009UM05      Nucl.Phys. A829, 13 (2009)

A.Umeya, G.Kaneko, K.Muto

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
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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
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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
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2006UM05      Phys.Rev. C 74, 034330 (2006)

A.Umeya, K.Muto

Single-particle energies in neutron-rich nuclei by shell model sum rule

doi: 10.1103/PhysRevC.74.034330
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2004UM01      Phys.Rev. C 69, 024306 (2004)

A.Umeya, K.Muto

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
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2003UM02      Nucl.Phys. A722, 558c (2003)

A.Umeya, K.Muto

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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