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NSR database version of April 11, 2024.

Search: Author = K.Nomura

Found 81 matches.

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2024KN01      Phys.Rev. C 109, 014313 (2024)

L.Knafla, K.Nomura, A.Esmaylzadeh, A.Harter, J.Jolie, V.Karayonchev, Y.H.Kim, U.Koster, M.Ley, C.Michelagnoli, A.Pfeil, J.-M.Regis, F.von Spee

Investigating the prolate-to-oblate shape phase transition: Lifetime measurements and γ spectroscopy of the low-lying negative parity structure in 193Os

doi: 10.1103/PhysRevC.109.014313
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2024LO01      Phys.Rev. C 109, 034304 (2024)

L.Lotina, K.Nomura

Impacts of hexadecapole deformations on the collective energy spectra of axially deformed nuclei

doi: 10.1103/PhysRevC.109.034304
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2024NO03      Phys.Rev. C 109, 034319 (2024)

K.Nomura

Low-energy structure and β-decay properties of neutron-rich nuclei in the region of a shape phase transition

doi: 10.1103/PhysRevC.109.034319
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2024SH06      Nucl.Phys. A1044, 122842 (2024)

S.Shukla, P.C.Srivastava, K.Nomura, L.Zamick

Systematic shell-model study for structure and isomeric states in 200-210Po isotopes

NUCLEAR STRUCTURE 200,202,204,206,208,210Po; calculated energy levels, J, π with systematic large-scale shell-model using KHH7B interaction. Comparison with experimental data.

doi: 10.1016/j.nuclphysa.2024.122842
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2023BR07      Nucl.Phys. A1039, 122738 (2023)

N.T.Brewer, E.H.Wang, W.A.Yzaguirre, J.H.Hamilton, K.Nomura, A.V.Ramayya, S.H.Liu, J.K.Hwang, B.M.Musangu, J.M.Eldridge, C.J.Zachary, Y.X.Luo, J.O.Rasmussen, S.J.Zhu, C.Goodin, G.M.Ter-Akopian, A.V.Daniel, Yu.Ts.Oganessian

Octupole deformation in 143, 145, 146Ba

RADIOACTIVITY 252Cf(SF); measured decay products, Eγ, Iγ. 143,145,146Ba; deduced γ-ray energies and relative intensities, partial level scheme, angular correlations, octupole bands, J, π, B(E1)/B(E2). Comparison with IBM and IBFM calculations.

doi: 10.1016/j.nuclphysa.2023.122738
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2023IM01      Phys.Rev. C 107, 034304 (2023)

M.Imbrisak, K.Nomura

Stability of the manifold boundary approximation method for reductions of nuclear structure models

doi: 10.1103/PhysRevC.107.034304
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2023IM02      Phys.Rev. C 108, 024321 (2023)

M.Imbrisak, K.Nomura

Classical and Bayesian error analysis of the relativistic mean-field model for doubly magic nuclei

NUCLEAR STRUCTURE 4He, 16O, 40Ca; calculated proton and neutron single-particle energies, charge radii. Single-particle energies are computed using the Woods-Saxon potential. Compared error estimates between the faster procedure that employs the Fisher information matrix (FIM) and the Bayesian MCMC method.

doi: 10.1103/PhysRevC.108.024321
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2023NO06      Int.J.Mod.Phys. E32, 2340001 (2023)

K.Nomura

Microscopic formulation of the interacting boson model for reflection asymmetric nuclei

NUCLEAR STRUCTURE 222,224,226,228,230,232Th; calculated potential energy surfaces, octupole shape phase transitions, signature splitting between the even-I and positive-parity and odd-I negative-parity bands as functions of the angular momentum.

doi: 10.1142/S0218301323400013
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2023PF03      Phys.Rev. C 108, 034310 (2023)

A.Pfeil, K.Nomura, N.Gavrielov, J.-M.Regis, U.Koster, Y.H.Kim, A.Esmaylzadeh, A.Harter, J.Jolie, L.Knafla, M.Ley, V.Karayonchev

Lifetime measurements in 99Nb and 99Zr: Investigation of shape coexistence

doi: 10.1103/PhysRevC.108.034310
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2023RU06      Phys.Rev. C 108, 064311 (2023)

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

Coulomb excitation of 96Mo

doi: 10.1103/PhysRevC.108.064311
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2022ES05      Phys.Rev. C 106, 064323 (2022)

A.Esmaylzadeh, A.Blazhev, K.Nomura, J.Jolie, M.Beckers, C.Fransen, R.-B.Gerst, A.Harter, V.Karayonchev, L.Knafla, M.Ley, F.von Spee

Investigation of γ softness: Lifetime measurements in 104, 106Ru

NUCLEAR REACTIONS 104Ru(18O, 18O), (18O, 16O), E=57 MeV; measured reaction products, Eγ, Iγ, (particle)γ-coin. 104,106Ru; deduced levels, J, π, T1/2 of low-lying excited states, B(E2), B(M1), shape invariants. Recoil-distance Doppler shift technique. Comparison to mapped-IBM calculation based on a microscopic energy density functional, to the values obtained with Wilets-Jean γ-soft model and to previous experimental data. Results indicate γ-softness and point on traixilaity in 104,106Ru. Cologne plunger device in conjunction with 11 HPGe detectors arranged in backward and forward rings combined with 6 PIN diodes for detecting the backscattered beam-like light recoiling fragments 10 MV FN-Tandem accelerator.

doi: 10.1103/PhysRevC.106.064323
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2022GE01      Phys.Rev. C 105, 024302 (2022)

R.-B.Gerst, A.Blazhev, K.Moschner, P.Doornenbal, A.Obertelli, K.Nomura, J.-P.Ebran, S.Hilaire, J.Libert, G.Authelet, H.Baba, D.Calvet, F.Chateau, S.Chen, A.Corsi, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, V.Lapoux, T.Motobayashi, M.Niikura, N.Paul, J.-Y.Rousse, H.Sakurai, C.Santamaria, D.Steppenbeck, R.Taniuchi, T.Uesaka, T.Ando, T.Arici, F.Browne, A.M.Bruce, R.Caroll, L.X.Chung, M.L.Cortes, M.Dewald, B.Ding, F.Flavigny, S.Franchoo, M.Gorska, A.Gottardo, J.Jolie, A.Jungclaus, J.Lee, M.Lettmann, B.D.Linh, J.Liu, Z.Liu, C.Lizarazo, S.Momiyama, S.Nagamine, N.Nakatsuka, C.R.Nita, C.Nobs, L.Olivier, R.Orlandi, Z.Patel, Zs.Podolyak, M.Rudigier, T.Saito, C.Shand, P.-A.Soderstrom, I.Stefan, V.Vaquero, V.Werner, K.Wimmer, Z.Xu

γ-ray spectroscopy of low-lying yrast and non-yrast states in neutron-rich 94, 95, 96Kr

NUCLEAR REACTIONS 1H(94Kr, p), (95Kr, p)(95Kr, np), (97Rb, 2p), (96Kr, p), (96Kr, np), (97Rb, n2p), E≈180 MeV/nucleon [secondary beams from 9Be(238U, X), E=345 MeV/nucleon primary reaction]; measured reaction products, Eγ, Iγ, Ep, Ip, pp-coin, gγ∓coin, pγ-coin. 94,95,96Kr; deduced levels, J, π, T1/2 of isomer and levels in 95Kr. Comparison to five-dimensional collective Hamiltonian (5DCH) beyond-mean-field model and mapped IBM calculations. Beam delivered via the ZeroDegree spectrometer to the Euroball RIKEN Cluster Array (EURICA) at RIBF-RIKEN.

doi: 10.1103/PhysRevC.105.024302
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2022KA19      Phys.Rev. C 105, 064310 (2022)

K.E.Karakatsanis, K.Nomura

Signatures of shape phase transitions in krypton isotopes based on relativistic energy density functionals

NUCLEAR STRUCTURE 76,78,80,82,84,86Kr; calculated triaxial quadrupole potential energy surfaces in (β, γ) planes, energies and collective wave functions contours in (β, γ) plane of first 2+ and 4+, second 2+, and first excited 0+ levels, B(E2) and B(E2) ratios, π2 for E0 transitions from the first and second excited 0+ states, E(first 4+)/E(first 2+), E(first 6+)/E(first excited 0+), E(second excited 0+)/E(first 2+), E(first excited 0+)/E(second excited 0+), and E(second 2+)/E(first 2+), fluctuations of the β and γ deformations, E(5) energy spectra and B(E2) transition strengths for 80,82Kr. Triaxial quadrupole constrained self-consistent mean-field (SCMF) calculations using DD-ME2 and DD-PC1 relativistic energy density functionals and pairing interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.105.064310
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2022NO02      Phys.Rev. C 105, 024320 (2022)

K.Nomura, C.M.Petrache

Questioning the wobbling interpretation of low-spin bands in γ-soft nuclei within the interacting boson-fermion model

NUCLEAR STRUCTURE 106Pd, 128Xe, 132Ba, 134Ce; calculated potential energy surfaces. 105Pd, 127Xe, 133La, 135Pr; calculated levels, J, π, δ, B(E2), B(M1), low-lying bands structure. Analysis does not confirm earlier proposed wobbling nature of the bands. Interacting boson-fermion model with Hamiltonian based on the mean-field calculations. Comparison to experimental data.

doi: 10.1103/PhysRevC.105.024320
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2022NO03      Phys.Rev. C 105, 044301 (2022)

K.Nomura

Two-neutrino double-β decay in the mapped interacting boson model

NUCLEAR STRUCTURE 48Ca, 48Ti, 76Ge, 76Se, 82Se, 82Kr, 96Zr, 96Mo, 100Mo, 100Ru, 110Pd, 110Cd, 116Cd, 116Sn, 124Sn, 124Te, 128Te, 128Xe, 130Te, 130Xe, 136Xe, 136Ba, 150Nd, 150Sm, 198Pt, 198Hg; calculated quadrupole triaxial (β, γ) deformation energy surfaces, levels, J, π, B(E2). 48Sc, 76As, 82Br, 96Nb, 100Tc, 110Ag, 116In, 124Sb, 128I, 130I, 136Cs, 150Pm, 198Au; levels, J, π, electric quadrupole moments, magnetic dipole moments, B(M1), B(E2), neutron and proton spherical single-particle energies, occupational probabilities. Self-consistent mean-field and interacting boson model built on the neutron and proton monopole and quadrupole bosons. Comparison to available experimental data.

RADIOACTIVITY 48Sc, 76As, 82Br, 96Nb, 100Tc, 110Ag, 116In, 124Sb, 128I, 130I, 136Cs, 150Pm, 198Au(β-), (EC); calculated logft to ground state, Gamow-Teller and Fermi matrix elements. 48Ca, 76Ge, 82Se, 96Zr, 100Mo, 110Pd, 116Cd, 124Sn, 128Te, 130Te, 136Xe, 150Nd, 198Pt(2β-); calculated Gamow-Teller and Fermi matrix elements, Q, T1/2. The energy density functional-based interacting boson model and interacting boson fermion-fermion model calculations. Comparison to available experimental data and other theoretical calculations.

doi: 10.1103/PhysRevC.105.044301
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2022NO04      Phys.Rev. C 105, 044306 (2022)

K.Nomura

β decay and evolution of low-lying structure in Ge and As nuclei

NUCLEAR STRUCTURE 66,67,68,69,70,71,72,73,74,75,76,77,78Ge, 67,68,69,70,71,72,73,74,75,76,77,78,79As; calculated spherical single-particle energies, quasiparticle energies, occupation probabilities, levels, J, π. 67,69,71,73,77, Ge, 67,69,71,73,75,77,79As; calculated B(E2), B(M1). 66,68,70,72,74,76,78Ge; calculated(β, γ)-deformation energy surfaces. 67,69,71,73,75,77Ge, 69,74,76,78As; calculated magnetic dipole moments. 68,70,72,71,73,75,77As; calculated magnetic dipole moments, electric quadrupole moments. Constrained self-consistent mean-field (SCMF) calculation based on the universal relativistic functional DD-PC1 and the separable pairing force of finite range.Comparison to experimental data.

RADIOACTIVITY 68,70As, 78Ge(β+), (EC); 75,77Ge(β-); 67,69,71,73,75,77As, 67,69,71,73,75,77Ge(EC); calculated logft. Constrained self-consistent mean-field (SCMF)calculations based on a universal energy density functional (EDF) and a pairing interaction. Comparison to experimental data.

doi: 10.1103/PhysRevC.105.044306
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2022NO05      Phys.Rev. C 105, 054318 (2022)

K.Nomura

Octupole correlations in collective excitations of neutron-rich N ≈ 56 nuclei

NUCLEAR STRUCTURE 86,88,90,92,94Se, 88,90,92,94,96Kr, 90,92,94,96,98Sr, 92,94,96,98,100Zr, 94,96,98,100,102Mo; calculated potential energy surfaces in (β2, β3) plane, levels, J, π, B(E1), B(E2), B(E3). 92,94,96Kr, 90,94Sr, 96Zr, 98Mo; calculated B(M1), electric quadrupole and magnetic dipole moments. sdf-IBM (interacting boson model) that makes distinction between the neutron and proton boson degrees of freedom. Comparison with experimental data.

doi: 10.1103/PhysRevC.105.054318
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2022NO09      Phys.Rev. C 106, 024330 (2022)

K.Nomura

Effect of configuration mixing on quadrupole and octupole collective states of transitional nuclei

NUCLEAR STRUCTURE 72Ge, 74Se, 74,76Kr; calculated levels, J, π, configurations and amplitudes, B(E2), B(E1), B(E3), ρ2(E0), X(E0/E2), spectroscopic quadrupole moments, triaxial quadrupole potential energy surfaces in (β, γ) plane, axially symmetric quadrupole and octupole potential energy surfaces in (β2, β3) plane. Self-consistent mean-field (SCMF) calculations using a universal energy density functional and a pairing interaction with configuration mixing and octupole degrees of freedom are incorporated microscopically in the interacting boson model (IBM) for simultaneously describing shape coexistence and quadrupole and octupole collective excitations. Comparison with experimental data.

doi: 10.1103/PhysRevC.106.024330
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2022NO10      Phys.Rev. C 106, 064304 (2022)

K.Nomura, L.Lotina, R.Rodriguez-Guzman, L.M.Robledo

Simultaneous description of β-decay and low-lying structure of neutron-rich even- and odd-mass Rh and Pd nuclei

NUCLEAR STRUCTURE 104,106,108,110,112,114,116,118,120,122,124Pd; calculated potential energy surfaces. 104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124Pd, 103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123Rh; calculated single-particle energies, quasiparticle energies, occupation probabilities, levels, J, π. 105,107,109Pd, 103,104,107,109Rh; calculated B(E2), B(M1). 106Rh; calculated magnetic dipole moment. Mapping framework based on the Gogny-EDF and the particle-boson coupling scheme. Constrained Hartree-Fock-Bogoliubov calculations using the Gogny-D1M energy density functional. Comparison to experimental data.

RADIOACTIVITY 104,105,106,107,108,109,110,112,113,114,116,117Rh(β-); calculated log ft, reduced matrix elements for GT transitions. Constrained Hartree-Fock-Bogoliubov calculations using the Gogny-D1M energy density functional. Comparison to experimental results.

doi: 10.1103/PhysRevC.106.064304
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2022NO11      Phys.Rev. C 106, 064317 (2022)

K.Nomura, K.E.Karakatsanis

Collective-model description of shape coexistence and intruder states in cadmium isotopes based on a relativistic energy density functional

NUCLEAR STRUCTURE 108,110,112,114,116Cd; calculated levels, J, π, potential energy surfaces as functions of the triaxial quadrupole deformations, protons and neutrons single-particle energies, B(E2), monopole transition strength, collective wave functions for 0+ and 2+ states. Calculations reproduced an observed decrease of the intruder bands toward the midshell N=66 as a function of nucleon number. Collective model with triaxial quadrupole Hamiltonian with parameters determined by the constrained self-consistent mean-field calculations within the relativistic Hartree-Bogoliubov method employing a universal energy density functional and a pairing force. Comparison to experimental results.

doi: 10.1103/PhysRevC.106.064317
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2022RO01      J.Phys.(London) G49, 015101 (2022)

R.Rodriguez-Guzman, L.M.Robledo, K.Nomura, N.Cruz Hernandez

Quadrupole-octupole collectivity in the Xe, Ba, Ce and Nd isotopic chains described with mean field and beyond approaches

NUCLEAR STRUCTURE 110,112,114,116,118,120,122,124,126,128Ba, 134,136,138,140,142,144,146,148,150,152Ba; calculated collective wave functions, positive and negative parity-projected energies, quadrupole (octupole) deformation of the ground states, HFB energies, parity-projected potential energy surfaces (PPPESs) using mean field based methods.

doi: 10.1088/1361-6471/ac3472
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2021ES09      Phys.Rev. C 104, 064314 (2021)

A.Esmaylzadeh, V.Karayonchev, K.Nomura, J.Jolie, M.Beckers, A.Blazhev, A.Dewald, C.Fransen, R.-B.Gerst, G.Hafner, A.Harter, L.Knafla, M.Ley, L.M.Robledo, R.Rodriguez-Guzman, M.Rudigier

Lifetime measurements to investigate γ softness and shape coexistence in 102Mo

NUCLEAR REACTIONS 100Mo(18O, 16O)102Mo, E=52 MeV; measured Eγ, Iγ, γγ-coin, T1/2 of levels by recoil-distance Doppler-shift method using an array of eleven HPGe detectors, and Cologne Plunger device at the Cologne FN Tandem accelerator facility. 102Mo; deduced levels, J, π, B(E2), B(M1), E0 transition probability; calculated deformation-energy surface in the (β, γ) plane. Comparison of levels and B(E2) with mapped interacting boson model (IBM) calculations, with microscopic input from Gogny mean-field. Systematics of 0+ and first 2+ states and B(E2) values in N=52-64, Sr, Zr, Mo and Ru isotopes. Discussed shape coexistence and γ-softness.

doi: 10.1103/PhysRevC.104.064314
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2021NO02      Phys.Rev. C 103, 044311 (2021)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo, J.E.Garcia-Ramos

Quadrupole-octupole coupling and the onset of octupole deformation in actinides

NUCLEAR STRUCTURE 224,226,228,230,232,234Pu, 228,230,232,234,236,238Cf; calculated self-consistent mean-field potential energy surfaces (SCMF-PESs) and sdf-IBM PESs in (β2, β3) plane. 218,220,222,224,226,228,230,232,234,236,238Ra, 220,222,224,226,228,230,232,234,236,238,240Th, 222,224,226,228,230,232,234,236,238,240,242U, 224,226,228,230,232,234,236,238,240,242,244Pu, 226,228,230,232,234,236,238,240,242,244,246Cm, 228,230,232,234,236,238,240,242,244,246,248Cf; calculated β2 and β3 corresponding to the ground-state minimum, deformation energies with respect to spherical configuration, octupole deformation energies, low-energy levels, J, π, B(E1), B(E2), effective quadrupole and octupole deformation parameters. 240Pu; calculated levels, J, π, bands. Hartree-Fock-Bogoliubov approximation, based on the Gogny-D1M energy density functional and corresponding mapped sdf-IBM. Comparison with experimental data taken from databases at Brookhaven National Laboratory.

doi: 10.1103/PhysRevC.103.044311
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2021NO05      Phys.Rev. C 103, 054301 (2021)

K.Nomura, L.Lotina, T.Niksic, D.Vretenar

Microscopic description of octupole collective excitations near N=56 and N=88

NUCLEAR STRUCTURE 86,88,90,92,94,96,98,100Se, 88,90,92,94,96,98,100,102Kr, 90,92,94,96,98,100,102,104Sr; 90Se, 92Kr, 94Sr, 96Zr, 98Mo, 100Ru, 102Pd, 104Cd, 106Sn, 108Te, 110Xe, 112Ba, 114Ce; 106,108,110,112,114,116,118,140,142,144,146,148,150,152Xe, 108,110,112,114,116,118,120,142,144,146,148,150,152,154Ba, 110,112,114,116,118,120,122,144,146,148,150,152,154,156Ce; calculated self-consistent mean-field (SCMF) potential energy surfaces (PES) in (β2, β3) plane, levels, J, π, B(E1), B(E2), B(E3) for the g.s. and octupole bands, probability density distributions for the lowest positive-parity 0+ and 1- states in 112Xe and 144Ba using quadrupole-octupole collective Hamiltonian (QOCH), and compared with experimental data taken from the ENSDF database. Nuclear density functional theory, with axially symmetric quadrupole-octupole constrained self-consistent mean-field (SCMF) with universal energy density functional and/or a pairing interaction.

doi: 10.1103/PhysRevC.103.054301
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2021NO06      Phys.Rev. C 103, 054322 (2021)

K.Nomura, D.Vretenar, Z.P.Li, J.Xiang

Coupling of pairing and triaxial shape vibrations in collective states of γ-soft nuclei

NUCLEAR STRUCTURE 128,130Xe; calculated levels, J, π, B(E2), E(2+ of γ band)/E(2+ of ground band), B(E2)(3+ to 2+ of γ band)/B(E2)(for 2+ of ground band), potential-energy surfaces (PES) for axial quadrupole and triaxial (β, γ), axial quadrupole and pairing (β, α), and triaxial quadrupole and pairing (γ, α) deformations. Self-consistent mean-field calculations of collective deformation-energy surfaces, and the framework of the interacting boson approximation with explicit coupling to pairing vibrations. Comparison with experimental data.

doi: 10.1103/PhysRevC.103.054322
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2021NO08      Phys.Rev. C 104, 024323 (2021)

K.Nomura, D.Vretenar, Z.P.Li, J.Xiang

Interplay between pairing and triaxial shape degrees of freedom in Os and Pt nuclei

NUCLEAR STRUCTURE 128Xe, 188,190,192Os, 192,194,196Pt; calculated potential energy surfaces (PES) in (β, γ), (α, β) and (γ, α) planes, where α represents pairing deformation, IBM Hamiltonian parameters. 128,130Xe, 188,190,192Os, 192,194,196Pt; calculated positive-parity levels, J, g.s. band, γ band, excited 0+ bands including axial+pairing (αβ), triaxial quadrupole (βγ), and triaxial+pairing (αβγ) deformation degrees of freedom, B(E2), B(E2) ratios, parameters X(E0/E2) and ρ2(E0) for 0+ to 0+ E0 transitions. Constrained self-consistent mean-field (SCMF) calculations using PC-PK1 and DD-PK1 energy density functional (EDFs) and pairing interactions, with number-nonconserving interacting boson model (IBM) Hamiltonian. Comparison with experimental data. Relevance to description of shape phase transitions and shape coexistence in γ-soft and triaxial nuclei, with simultaneous treatment of pairing vibrations and triaxial deformations through EDF-based IBM calculations.

doi: 10.1103/PhysRevC.104.024323
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2021NO10      Phys.Rev. C 104, 044317 (2021)

K.Nomura, N.Gavrielov, A.Leviatan

Partial dynamical symmetry from energy density functionals

NUCLEAR STRUCTURE 168Er; calculated levels, J, π, ground, γ and β bands using SU(3)-PDS, Skyrme SLy4 and DD-ME2 energy density functionals (EDFs), self-consistent mean-field (SCMF) energy surfaces in (β-γ) plane nonrelativistic Skyrme SLy4 and SkP (EDFs), and relativistic DD-PC1 and DD-ME2 EDFs with different values of pairing strengths, SU(3) decomposition of states in the ground, γ, and β bands for the SU(3)-PDS, SLy4, SkP, DD-PC1 and DD-ME2 EDFs in the framework of universal energy density functionals and a general quantal boson Hamiltonian. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.044317
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2021NO11      Phys.Rev. C 104, 044324 (2021)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo, J.E.Garcia-Ramos, N.C.Hernandez

Evolution of octupole deformation and collectivity in neutron-rich lanthanides

NUCLEAR STRUCTURE 140,142,144,146,148Xe, 142,144,146,148,150Ba, 144,146,148,150,152Ce, 146,148,150,152,154Nd; calculated potential energy surfaces in (β2, β3) planes using self-consistent mean-field (SCMF) and interacting boson model (IBM), low-lying levels of positive- and negative-parity yrast states, strength parameters, level-energy and B(E2) ratios, quadrupole and octupole moments. 144,146Ba, 148,150Nd; calculated levels, J, p, bands, B(E1), B(E2), B(E3) using interacting boson model (IBM). Self-consistent mean-field (SCMF), and interacting boson model (IBM) approaches with Hartree-Fock-Bogoliubov (HFB) approximation and constrains on axially symmetric quadrupole and octupole operators using the Gogny-D1M interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.044324
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2021NO13      Phys.Rev. C 104, 054320 (2021)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Quadrupole-octupole coupling and the evolution of collectivity in neutron-deficient Xe, Ba, Ce, and Nd isotopes

NUCLEAR STRUCTURE 108,110,112,114,116,118Xe, 110,112,114,116,118,120Ba, 112,114,116,118,120,122Ce, 114,116,118,120,122,124Nd; calculated self-consistent mean-field (SCMF) and mapped-IBM potential-energy surfaces (PES) in (β2, β3) plane, low-energy yrast states, and states of quasi-β, and quasi-γ bands, B(E1), B(E2), B(E3), ratios E(excited states)/E(first 2+), effective quadrupole and octupole deformations; predicted octupole-deformed ground states for Ba and Ce isotopes near N=56. Mapped sdf-IBM framework, with microscopic input from quadrupole and octupole constrained Hartree-Fock-Bogoliubov (HFB) calculations, based on Gogny D1M energy density functional. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.054320
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2020NO01      Phys.Rev. C 101, 014306 (2020)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Structure of odd-odd Cs isotopes within the interacting boson-fermion-fermion model based on the Gogny-D1M energy density functional

NUCLEAR STRUCTURE 123,124Xe, 124,125,126,128,130,132Cs; calculated levels, J, π, band structures, electric quadrupole and magnetic dipole moments, B(E2), B(M1), B(M1)/B(E2), neutron and proton single-particle energies and occupation probabilities for odd-odd Cs isotopes. 124Xe; calculated Gogny-D1M and IBM-2 (β, γ) deformation energy surfaces up to 3 MeV from the global minimum. Interacting boson-fermion-fermion model based on the Gogny-D1M energy density functional framework. Comparison with experimental data from the databases at NNDC.

doi: 10.1103/PhysRevC.101.014306
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2020NO02      Phys.Rev. C 101, 024311 (2020)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

β decay of odd-A nuclei with the interacting boson-fermion model based on the Gogny energy density functional

NUCLEAR STRUCTURE 124,126,128,130,132,134Xe, 126,128,130,132,134,136Ba; calculated low-lying levels of positive parity, J. 123,125,127,129,131,133Xe, 125,127,129,131,133,135Ba, 125,127,129,131,133,135Cs, 127,129,131,133,135,137La; calculated low-lying levels of positive parity, J, B(M1), B(E2), electric quadrupole and magnetic dipole moments, β-decay properties. 127Xe; calculated levels of positive parity, J using two IBFM models. Interacting boson-fermion model (IBFM), based on the Gogny-D1M nuclear energy density functional (EDF), with the constrained HartreeFock-Bogoliubov (HFB) approximation to compute potential energy surfaces. Comparison with experimental data taken from the ENSDF database at NNDC.

RADIOACTIVITY 125,127,129,131,133Cs, 127,129,131,133Ba, 129,131,133,135La(EC), (β+); calculated log ft values and compared with experimental values taken from the ENSDF database at NNDC. IBFM model calculations using input from realistic mean field calculations.

doi: 10.1103/PhysRevC.101.024311
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2020NO04      Phys.Rev. C 101, 044318 (2020)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

β decay of even-A nuclei within the interacting boson model with input based on nuclear density functional theory

NUCLEAR STRUCTURE 124,126,128,130,132Xe, 124,126,128,130,132Ba, 124,126,128,130,132Cs; calculated levels, J, π using interacting boson model (IBM) with energy density functional (EDF). Comparison with experimental data from the ENSDF database.

RADIOACTIVITY 124,126,128Ba, 124,126,128,130,132Cs(β+), (EC); calculated logft for Gamow-Teller (GT) and Fermi (F) transition, and compared with experimental data from the ENSDF database. Energy density functional (EDF) based Interacting boson model (IBM) approach.

doi: 10.1103/PhysRevC.101.044318
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2020NO08      Phys.Rev. C 102, 034315 (2020)

K.Nomura, T.Niksic, D.Vretenar

Shape phase transitions in odd-A Zr isotopes

NUCLEAR STRUCTURE 94,96,98,100,102Zr; calculated deformation energy, and bosonic energy surfaces in (β, γ) planes, energies of low-lying positive-parity levels, effective quadrupole deformation parameters for the lowest three 0+ states. 95,97,99,101,103Zr; calculated levels, J, π, band structures, neutron single-particle energies and occupation probabilities, probability amplitudes of single-neutron configurations, B(M1), B(E2), μ, Q, β and γ deformation parameters. Deformation constrained self-consistent mean-field (SCMF) calculations with the relativistic Hartree-Bogoliubov method based on the universal energy density functional DD-PC1 and a separable pairing interaction. Energy spectra of even-even Zr nuclei from mapping the SCMF deformation energy surfaces onto the expectation value of the IBM-2 Hamiltonian in the boson condensate state. Comparison with experimental data.

doi: 10.1103/PhysRevC.102.034315
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2020NO11      Phys.Rev. C 102, 054313 (2020)

K.Nomura, D.Vretenar, Z.P.Li, J.Xiang

Pairing vibrations in the interacting boson model based on density functional theory

NUCLEAR STRUCTURE 122Xe, 152Nd, 154Sm, 156Gd, 158Dy; calculated potential energy surfaces (PES) in (β, α) plane using constrained RMF+BCS with PC-PK1 energy density functional and separable pairing interaction; calculated levels, J, π, B(E2), matrix elements of the monopole pair transfer operator. Interacting boson model (IBM), based on the nuclear density functional theory, with a boson-number nonconserving IBM Hamiltonian for pairing vibrations for coupling between shape and pairing collective degrees of freedom. Comparison with experimental data taken from the ENSDF database, and other references.

doi: 10.1103/PhysRevC.102.054313
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2020NO13      Phys.Rev. C 102, 064326 (2020)

K.Nomura, R.Rodriguez-Guzman, Y.M.Humadi, L.M.Robledo, J.E.Garcia-Ramos

Octupole correlations in light actinides from the interacting boson model based on the Gogny energy density functional

NUCLEAR STRUCTURE 218,220,222,224,226,228,230,232,234,236,238Ra, 220,222,224,226,228,230,232,234,236,238,240Th; calculated potential energy surfaces in (β2, β3) plane using self-consistent mean-field (SCMF), and interacting boson model (IBM), energies of yrast positive-parity and negative-parity states, and relative energy splitting between positive- and negative-parity yrast bands, B(E1), B(E2), B(E3), transition quadrupole and octupole moments. Hartree-Fock-Bogoliubov approximation, based on Gogny-D1M energy density functional, and sdf interacting boson model (IBM) Hamiltonian for quadrupole-octupole coupling and collective excitations in even-even actinides. Comparison with experimental data.

doi: 10.1103/PhysRevC.102.064326
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2019ES04      Phys.Rev. C 100, 064309 (2019)

A.Esmaylzadeh, J.-M.Regis, Y.H.Kim, U.Koster, J.Jolie, V.Karayonchev, L.Knafla, K.Nomura, L.M.Robledo, R.Rodriguez-Guzman

Lifetime measurements and shape coexistence in 97Sr

NUCLEAR REACTIONS 235U(n, F), E=thermal neutrons from high-flux reactor of ILL-Grenoble; measured fission products using Lohengrin spectrometer, Eγ, Iγ, level half-lives by (fragment)γγ(t) fast-timing technique using LaBr detectors for γ detection and ionization chamber for fission fragments. 97Sr; deduced levels, isomer, J, π, B(M1), B(E2). Comparison with previous experimental results, and with interacting boson-fermion model calculation based on microscopic energy density functional.

doi: 10.1103/PhysRevC.100.064309
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2019MU08      Phys.Rev. C 99, 054325 (2019)

C.Muller-Gatermann, A.Dewald, C.Fransen, K.Auranen, H.Badran, M.Beckers, A.Blazhev, T.Braunroth, D.M.Cullen, G.Fruet, A.Goldkuhle, T.Grahn, P.T.Greenlees, A.Herzan, U.Jakobsson, D.Jenkins, J.Jolie, R.Julin, S.Juutinen, J.Konki, M.Leino, J.Litzinger, K.Nomura, J.Pakarinen, P.Peura, M.G.Procter, P.Rahkila, P.Ruotsalainen, M.Sandzelius, J.Saren, C.Scholey, J.Sorri, S.Stolze, M.J.Taylor, J.Uusitalo, K.O.Zell

Shape coexistence in 178Hg

NUCLEAR REACTIONS 103Rh(78Kr, 2np), E=354 MeV; measured Eγ, Iγ, Eα, (recoil)γ- and αγ-coin, half-lives of levels in the yrast band by recoil-distance Doppler-shift method (RDDS) using RITU separator, JUROGAM II array, GREAT spectrometer and DPUNS plunger at the K-130 cyclotron facility of the University of Jyvaskyla. Recoil-decay tagging method. 178Hg; deduced high-spin levels, J, π, B(E2), transition quadrupole moments, quadrupole deformation parameter β2 and configuration-mixing features. Comparison with predictions of interacting boson model, mean-field model, and total routhian surface (TRS) calculations. Systematics of energy levels in A=172-204, even-A Hg isotopes. Systematics of transition quadrupole moments and kinetic moments of inertia for yrast states in 178,180,182,184Hg.

RADIOACTIVITY 174,175,176Pt, 177,178,179Au, 177,178,179Hg(α)[from 103Rh(78Kr, X), E=354 MeV]; measured Eα correlated with ions.

doi: 10.1103/PhysRevC.99.054325
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2019NO03      Phys.Rev. C 99, 024324 (2019)

K.Nomura, Y.Zhang

Two-neutron transfer reactions and shape phase transitions in the microscopically formulated interacting boson model

NUCLEAR STRUCTURE 146,148,150,152,154,156,158Sm, 150,152,154,156,158,160Gd, 152,154,156,158,160,162Dy; calculated potential energy surfaces (PES) in (β, γ) deformation space, low-lying levels, J, π using three versions of interacting boson model (IBM) based on nuclear energy density functional theory and within the constrained self-consistent mean-field (SCMF) method: m-IBM, p-IBM, and CQF Hamiltonian. Comparison with experimental values.

NUCLEAR REACTIONS 146,148,150,152,154,156Sm, 148,150,152,154,156,158Gd, 150,152,154,156,158,160Dy(t, p), (p, t), E not given; calculated transfer reaction intensities using three versions of interacting boson model (IBM) calculations: m-IBM, p-IBM, and CQF.

doi: 10.1103/PhysRevC.99.024324
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2019NO04      Phys.Rev. C 99, 034308 (2019)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Spectroscopy of odd-odd nuclei within the interacting boson-fermion-fermion model based on the Gogny energy-density functional

NUCLEAR STRUCTURE 195,196,197,198,199,200Hg, 194,195,196,197,198,199Au; calculated levels, J, π, potential energy surfaces for 196,198,200Hg, strength parameters for 195,197,199Hg, 194,196,198Au nuclei, neutron and proton single-particle energies and occupation probabilities for odd-A nuclides, and B(E2), B(M1), electric quadrupole and magnetic dipole moments for 194,196,198Au using interacting boson-fermion-fermion model (IBFFM) based on the Gogny D1M energy-density functional. Comparison with experimental values taken from databases at NNDC, BNL.

doi: 10.1103/PhysRevC.99.034308
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2018NO03      Phys.Rev. C 97, 024317 (2018)

K.Nomura, T.Niksic, D.Vretenar

Signatures of octupole correlations in neutron-rich odd-mass barium isotopes

NUCLEAR STRUCTURE 142,144,146Ba; calculated deformation energy surfaces in (β2, β3) plane from constrained relativistic Hartree-Bogoliubov self-consistent mean-field (SCMF) method and using DD-PC1 nuclear density functional, low-energy positive- and negative-parity levels, J, π, B(E2), B(E3) of the even-even boson core nuclei. 143,145,147Ba; calculated levels, J, π, B(E2), B(E3), expectation values of the f-boson number operator, amplitudes of spherical single-particle configuration in the IBFM wave functions of bandhead states; discussed octupole correlations. Calculations based on sdf-IBFM framework, with the boson-core Hamiltonian involving quadrupole and octupole boson degrees of freedom. Comparison with experimental data taken from databases at NNDC, BNL.

doi: 10.1103/PhysRevC.97.024317
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2018NO06      Phys.Rev. C 97, 064313 (2018)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Description of neutron-rich odd-mass krypton isotopes within the interacting boson-fermion model based on the Gogny energy density functional

NUCLEAR STRUCTURE 86,88,90,92,94Kr; calculated deformation energy surfaces in (β, γ) plane, energies of first 2+ and 4+ states, B(E2) and spectroscopic quadrupole moments of the first 2+ states. 87,89,91,93,95Kr; calculated levels, J, π of low-lying states, B(E2), B(M1), spectroscopic quadrupole moments and magnetic dipole moments of the first 5/2+, 3/2+, and 1/2+ states. Interacting boson-fermion model (IBFM) calculations with Gogny-D1M energy density functional. Comparison with experimental data.

doi: 10.1103/PhysRevC.97.064313
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2018NO07      Phys.Rev. C 97, 064314 (2018)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Prolate-to-oblate shape phase transitions in neutron-rich odd-mass nuclei

NUCLEAR STRUCTURE 186,188,190,192,194Pt, 186,188,190,192,194Os; calculated deformation energy surfaces in (β, γ) plane, energies of first 4+ and 2+, and second 2+ states, spectroscopic quadrupole moments and B(E2) of first 2+ states. 185,187,189,191,193,195,197,199Pt, 185,187,189,191,193Os, 185,187,189,191,193,195Ir; calculated strength parameters, single particle energies, and occupation probabilities, levels, J, π of low-lying states, effective β and γ deformation parameters, B(E2), B(M1), spectroscopic quadrupole moments and magnetic dipole moments for 195Pt, 189Os, 191Ir. Constrained self-consistent mean-field calculations within the Hartree-Fock-Bogoliubov method using Gogny-D1M energy density functional (EDF) for even-even isotopes, and interacting boson-fermion model (IBFM) Hamiltonian with Gogny-D1M EDF for odd-A isotopes. Comparison with experimental data.

doi: 10.1103/PhysRevC.97.064314
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2018NO09      Phys.Rev. C 98, 024303 (2018)

K.Nomura, J.Jolie

Structure of even-even cadmium isotopes from the beyond-mean-field interacting boson model

NUCLEAR STRUCTURE 108,110,112,114,116Cd; calculated levels, J, π, contour plots in (β, γ) plan for deformation energy surfaces, configuration mixing, fraction of intruder configuration in the lowest five 0+ and three 2+ wavefunctions, B(E2), and ρ2(E0) values using self-consistent mean-field approach. Comparison with experimental data taken from evaluations in Nuclear Data Sheets.

doi: 10.1103/PhysRevC.98.024303
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2017DA06      Phys.Rev. C 95, 024328 (2017)

T.Daniel, S.Kisyov, P.H.Regan, N.Marginean, Zs.Podolyak, R.Marginean, K.Nomura, M.Rudigier, R.Mihai, V.Werner, R.J.Carroll, L.A.Gurgi, A.Oprea, T.Berry, A.Serban, C.R.Nita, C.Sotty, R.Suvaila, A.Turturica, C.Costache, L.Stan, A.Olacel, M.Boromiza, S.Toma

γ-ray spectroscopy of low-lying excited states and shape competition in 194Os

NUCLEAR REACTIONS 192Os(18O, 16O), E=80 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), half-life of the first 2+ and 4+ states by γγ(t) using RoSPHERE array at IFIN-HH, Bucharest facility. 194Os; deduced levels, J, π, bands, multipolarities, B(E2), effective β2. 192Os; measured half-life of the first 2+ state by γγ(t). Comparison with Hartree-Fock-Bogoliubov interacting-boson-model (IBM) calculations. Systematics of energies of ground-state band members in 176,178,180,182,184,186,188,190,192,194,196,198Os. Systematics of B(E2) and β2 for first 2+ states in 174,176,178,180,182,184,186,188W, 178,180,182,184,186,188,190,192,194Os, 180,184,186,188,190,192,194,196,198Pt.

doi: 10.1103/PhysRevC.95.024328
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2017NO04      Phys.Rev. C 95, 064310 (2017)

K.Nomura, R.RodrIguez-Guzman, L.M.Robledo

Structural evolution in germanium and selenium nuclei within the mapped interacting boson model based on the Gogny energy density functional

NUCLEAR STRUCTURE 66,68,70,72,74,76,78,80,82,84,86,88,90,92,94Ge, 68,70,72,74,76,78,80,82,84,86,88,90,92,94,96Se; calculated mean-field potential energy surfaces in (β, γ) plane using the Gogny-D1M EDF, and the IBM, level energies and B(E2) of low-lying 0+, 2+ and 4+ states, fraction of intruder configuration in 0+ states, spectroscopic quadrupole moments of 2+ states, ρ2(E0). 70,72,74,92Ge, 72,74,76,94Se; calculated positive-parity levels, J. Shape/phase transitions and shape coexistence. Interacting boson model (IBM) with self-consistent mean-field calculation based on the Gogny-D1M energy density functional, with mean-field energy surface from constrained Hartree-Fock-Bogoliubov (HFB) method. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.064310
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2017NO06      Phys.Rev. C 96, 014304 (2017)

K.Nomura, T.Niksic, D.Vretenar

Shape-phase transitions in odd-mass γ-soft nuclei with mass A ≈ 130

NUCLEAR STRUCTURE 129,130,131,132,133,134,135,136,137Ba, 127,128,129,130,131,132,133,134,135Xe, 129,130,131,132,133,134,135,136,137La, 127,128,129,130,131,132,133,134,135Cs; calculated low-lying levels, J, π, B(E2), B(M1), electric quadrupole and magnetic dipole moments, single-particle energies and occupation probabilities of the spherical single particle orbitals in odd-A nuclei, parameters of the boson-fermion Hamiltonian, self-consistent RHB triaxial quadrupole binding energy contours in (β, γ) plane for 130,132,134,136Ba, 128,130,132,134Xe. Comparison with experimental data taken from the NNDC-BNL databases.

doi: 10.1103/PhysRevC.96.014304
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2017NO07      Phys.Rev. C 96, 014314 (2017)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Description of odd-mass nuclei within the interacting boson-fermion model based on the Gogny energy density functional

NUCLEAR STRUCTURE 149,151,153,155Eu, 149,151,153,155Sm, 195Pt, 195Au; calculated spherical single-particle energies, occupation probabilities of the single-particle orbitals, parameters of the boson-fermion Hamiltonian, coupling constants of the boson-fermion interaction, levels, J, π, B(E2), B(M1), electric quadrupole and magnetic dipole moments, bands and wavefunction amplitudes for levels in 195Pt and 195Au. 148,150,152,154Sm, 194Pt; calculated parameters of the boson Hamiltonian, potential energy surface contours in (β, γ) plane, low-lying levels, J, π, B(E2) for 194Pt. Interacting boson fermion model (IBFM) with parameters based on the Hartree-Fock-Bogoliubov (HFB) approximation, and with the Gogny-D1M energy density functional (EDF) at the mean-field level. Comparison with experimental data.

doi: 10.1103/PhysRevC.96.014314
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2017NO08      Phys.Rev. C 96, 034310 (2017)

K.Nomura, R.Rodriguez-Guzman, Y.M.Humadi, L.M.Robledo, H.Abusara

Structure of krypton isotopes within the interacting boson model derived from the Gogny energy density functional

NUCLEAR STRUCTURE 70,72,74,76,78,80,82,84,86,88,90,92,94,96,98,100Kr; calculated (β, γ)-deformation energy surfaces, mapped IBM energy surfaces, energies, B(E2) and ρ2(E0) for first and second 2+, first 4+ and second 0+ states using Gogny-D1M and relativistic DD-PC1 energy density functionals (EDFs). 74,76,96,98Kr; calculated positive-parity levels, J using Gogny-D1M EDF. 76,98Kr; calculated low-energy positive-parity levels, J using Gogny D1S, D1M, D1N, relativistic DD-ME2 and DD-PC1 EDFs. Discussed shape transition and shape coexistence phenomena. Interacting boson model (IBM), with Hamiltonian from mean-field calculations based on several parametrizations of the Gogny energy density functional and the relativistic mean-field Lagrangian. Comparison with available experimental data.

doi: 10.1103/PhysRevC.96.034310
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2017NO12      Phys.Rev. C 96, 064316 (2017)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Shape transitions in odd-mass γ-soft nuclei within the interacting boson-fermion model based on the Gogny energy density functional

NUCLEAR STRUCTURE 129,131,133,135,137Ba, 127,129,131,133,135,137Xe, 129,131,133,135,137La, 127,129,131,133,135Cs; calculated single-particle energies, strength parameter of boson-fermion interaction, low-lying levels, J, π, B(E2), B(M1), spectroscopic quadrupole moments, magnetic moments. 128,130,132,134,136Ba, 126,128,130,132,134Xe; calculated Gogny-D1M and mapped IBM energy surfaces in (β2, γ) plane, low-lying levels, J, π. Interacting boson-fermion model (IBFM), with parameters determined from the microscopic Hartree-Fock-Bogoliubov (HFB) approximation, based on the parametrization D1M of the Gogny energy density functional. Comparison with experimental data taken from the databases at NNDC.

doi: 10.1103/PhysRevC.96.064316
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2017VA30      Phys.Rev. C 96, 064305 (2017)

P.Van Isacker, J.Engel, K.Nomura

Neutron-proton pairing and double-β decay in the interacting boson model

NUCLEAR STRUCTURE 44,46,48Ca, 44Sc, 44,46,48,50Ti, 48,50Cr; calculated levels, J, π using IBM, p-IBM and shell-model with KB3G interaction. Isospin-invariant version of the nucleon-pair shell model applied to shell-model calculations, and interacting-boson-model (IBM) calculations with and without the isoscalar boson.

RADIOACTIVITY 42,44,46,48Ca, 46,48,50Ti, 50Cr(2β-); calculated 0νββ matrix elements for g.s. to g.s. and Gamow-Teller transitions using shell-model, IBM and p-IBM; deduced that isoscalar boson is not important for energy spectra but improves the results for the double-β matrix elements.

doi: 10.1103/PhysRevC.96.064305
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2016GR15      Phys.Rev. C 94, 044327 (2016)

T.Grahn, S.Stolze, D.T.Joss, R.D.Page, B.Saygi, D.O'Donnell, M.Akmali, K.Andgren, L.Bianco, D.M.Cullen, A.Dewald, P.T.Greenlees, K.Heyde, H.Iwasaki, U.Jakobsson, P.Jones, D.S.Judson, R.Julin, S.Juutinen, S.Ketelhut, M.Leino, N.Lumley, P.J.R.Mason, O.Moller, K.Nomura, M.Nyman, A.Petts, P.Peura, N.Pietralla, Th.Pissulla, P.Rahkila, P.J.Sapple, J.Saren, C.Scholey, J.Simpson, J.Sorri, P.D.Stevenson, J.Uusitalo, H.V.Watkins, J.L.Wood

Excited states and reduced transition probabilities in 168Os

NUCLEAR REACTIONS 92Mo(78Kr, 2p), E=335, 345, 348 MeV; measured Eγ, Iγ, γγ-, (recoil)γ-coin, level half-lives by recoil-distance method using a plunger device, RITU separator, GREAT spectrometer, JUROGAM array at Jyvaskyla accelerator facility. 168Os; deduced high-spin levels, J, π, bands, B(E2), B(E1), transition quadrupole and dipole moments. Comparisons with interacting boson model (IBM-2) calculations based on the SkM* energy-density functional. Systematics of ground bands, and excited positive-parity level energies up to 8+ in 168,170,172,174,176,178,180,182,184Os.

doi: 10.1103/PhysRevC.94.044327
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2016NO02      J.Phys.(London) G43, 024008 (2016)

K.Nomura, T.Otsuka, P.Van Isacker

Shape coexistence in the microscopically guided interacting boson model

NUCLEAR STRUCTURE 148,150,154Sm, 134Ba, 186Pb, 172,174,176,178,180,182,184,186,188,190Hg; calculated total energy surfaces, J, π. Interacting boson model (IBM).

doi: 10.1088/0954-3899/43/2/024008
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2016NO06      Phys.Rev. C 93, 054305 (2016)

K.Nomura, T.Niksic, D.Vretenar

Beyond-mean-field boson-fermion model for odd-mass nuclei

NUCLEAR STRUCTURE 151,153,155Eu; calculated low-energy levels, J, π, B(E2), B(M1), electric quadrupole and magnetic dipole moments in the framework of nuclear energy density functional theory with IBFM Hamiltonian for the particle-core coupling scheme. Comparison with experimental data.

doi: 10.1103/PhysRevC.93.054305
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2016NO11      Phys.Rev. C 94, 044314 (2016)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Structural evolution in A ∼ 100 nuclei within the mapped interacting boson model based on the Gogny energy density functional

NUCLEAR STRUCTURE 92,94,96,98,100,102,104,106,108Sr, 94,96,98,100,102,104,106,108,110Zr, 96,98,100,102,104,106,108,110,112Mo, 98,100,102,104,106,108,110,112,114Ru; calculated deformation-energy surface contours in (β, γ) plane within the constrained Hartree-Fock-Bogoliubov framework, low-lying yrast and non-yrast levels, J, π, amplitudes of first and second 0+ states, B(E2). Self-consistent mean-field approximation based on the Gogny-D1M energy density functional. Comparison with experimental data taken from NNDC databases.

doi: 10.1103/PhysRevC.94.044314
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2016NO13      Phys.Rev. C 94, 064310 (2016)

K.Nomura, T.Niksic, D.Vretenar

Signatures of shape phase transitions in odd-mass nuclei

NUCLEAR STRUCTURE 148,150,152,154Sm; calculated self-consistent RHB triaxial quadrupole binding energy contours in (β, γ) plane, equilibrium deformation parameter for Kπ=0+ bandheads, B(E2) for the two lowest 0+ states. 147,149,151,153,155Sm, 147,149,151,153,155Eu; calculated levels, J, π, excitation energies of low-lying positive- and negative-parity yrast states as functions of neutron number, equilibrium deformation parameter for bandheads for the lowest three positive- and negative-parity bands, B(E2) between the bandheads and the lowest five states, S(p) and S(n). Microscopic framework based on nuclear energy density functional theory and the particle-plus-boson-core coupling scheme. Comparison with experimental data taken from the NNDC-BNL databases.

doi: 10.1103/PhysRevC.94.064310
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2016TH01      Nucl.Phys. A947, 203 (2016)

T.Thomas, V.Werner, J.Jolie, K.Nomura, T.Ahn, N.Cooper, H.Duckwitz, A.Fitzler, C.Fransen, A.Gade, M.Hinton, G.Ilie, K.Jessen, A.Linnemann, P.Petkov, N.Pietralla, D.Radeck

Nuclear structure of 96, 98Mo: Shape coexistence and mixed-symmetry states

NUCLEAR REACTIONS 96Zr(3He, 3n), E=18 MeV;96Zr(α, 2n), E=16 MeV;measured Eγ, Iγ(θ), γγ-coin using OSIRIS and YRAST Ball spectrometer; deduced γ angular correlations; deduced levels, J, π, branching and E2/M1 mixing ratios, B(M1), B(E2), lifetimes of discrete γ transitions using Doppler Shift Attenuation Method; calculated β, γ deformations using Skyrme energy density functional, IBM-2 configuration mixing; deduced parameters, one- and two-phonon mixed-symmetry states, shape coexistence.

doi: 10.1016/j.nuclphysa.2015.12.010
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2015NO02      Phys.Rev. C 92, 014312 (2015)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Spectroscopy of quadrupole and octupole states in rare-earth nuclei from a Gogny force

NUCLEAR STRUCTURE 146,148,150,152,154,156Sm, 148,150,152,154,156,158Gd; calculated levels, J, π, 0+ states, signature splitting, B(E1), B(E2), B(E3), potential energy surfaces in (β2, β3) plane, parameters of sdf-IBM Hamiltonian, correlation energies for 0+ states. Interacting boson model (IBM) with Hamiltonian parameters from mean-field calculations using Gogny energy density functional. comparison with experimental data, and with results of configuration mixing calculations with the Gogny force within the generator coordinate method (GCM). Discussed structure of excited 0+ states and their connection with double-octupole phonons.

doi: 10.1103/PhysRevC.92.014312
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2015RU03      Phys.Rev. C 91, 044301 (2015)

M.Rudigier, K.Nomura, M.Dannhoff, R-B.Gerst, J.Jolie, N.Saed-Samii, S.Stegemann, J.-M.Regis, L.M.Robledo, R.Rodriguez-Guzman, A.Blazhev, Ch.Fransen, N.Warr, K.O.Zell

Evolution of E2 transition strength in deformed hafnium isotopes from new measurements on 172Hf, 174Hf, and 176Hf

NUCLEAR REACTIONS 170,172Yb(α, 2n), E=27 MeV; 174Yb(α, 2n), E=26 MeV; measured conversion-electron momentum spectra using Cologne Orange magnetic spectrometer, Eγ, Iγ, γγ-, (ce)γγ-coin, level half-lives by (ce)γ(t) and γγ(t) methods with emphasis on the first 2+ states. 172,174,176Hf; deduced levels, J, π, B(E2). Comparison with previous results, and with theoretical model calculations.

NUCLEAR STRUCTURE 168,170,172,174,176,178,180Hf; calculated contour plots of the deformation energy surfaces in (β, γ) plane for 168Hf to 176Hf, parameters for the IBM Hamiltonian, levels, J, π, moments of inertia and B(E2) for levels in the ground-state rotational band. Interacting boson model with Hamiltonian from Gogny HFB calculations using the D1M interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.044301
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2014NO01      Phys.Rev. C 89, 024312 (2014)

K.Nomura, D.Vretenar, T.Niksic, B.-N.Lu

Microscopic description of octupole shape-phase transitions in light actinide and rare-earth nuclei

NUCLEAR STRUCTURE 222,224,226,228,230,232Th, 218,220,222,224,226,228Ra, 146,148,150,152,154,156Sm, 140,142,144,146,148,150Ba; calculated energy surface contours in (β2, β3) plane, mean values of octupole deformation, levels, J, π, E(J)/E(first 2+) ratios, B(E1), B(E2), B(E3), quadrupole and octupole intrinsic moments. Octupole shape transitions. Self-consistent relativistic Hartree-Bogoliubov (RHB), and interacting boson model (IBM) calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.89.024312
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2013AL05      Nucl.Phys. A899, 1 (2013); Erratum Nucl.Phys. A947, 260 (2016)

M.Albers, K.Nomura, N.Warr, A.Blazhev, J.Jolie, D.Mucher, B.Bastin, C.Bauer, C.Bernards, L.Bettermann, V.Bildstein, J.Butterworth, M.Cappellazzo, J.Cederkall, D.Cline, I.Darby, S.Das Gupta, J.M.Daugas, T.Davinson, H.De Witte, J.Diriken, D.Filipescu, E.Fiori, C.Fransen, L.P.Gaffney, G.Georgiev, R.Gernhauser, M.Hackstein, S.Heinze, H.Hess, M.Huyse, D.Jenkins, J.Konki, M.Kowalczyk, T.Kroll, R.Krucken, J.Litzinger, R.Lutter, N.Marginean, C.Mihai, K.Moschner, P.Napiorkowski, B.S.Nara Singh, K.Nowak, J.Pakarinen, M.Pfeiffer, D.Radeck, P.Reiter, S.Rigby, L.M.Robledo, R.Rodriguez-Guzman, M.Rudigier, M.Scheck, M.Seidlitz, B.Siebeck, G.S.Simpson, P.Thole, T.Thomas, J.Van de Walle, P.Van Duppen, M.Vermeulen, D.Voulot, R.Wadsworth, F.Wenander, K.Wimmer, K.O.Zell, M.Zielinska

Shape dynamics in neutron-rich Kr isotopes: Coulomb excitation of 92Kr, 94Kr and 96Kr

NUCLEAR REACTIONS 194,196Pt(92Kr, 92Kr'), (94Kr, 94Kr'), (96Kr, 96Kr'), E=2.85 MeV/nucleon; measured projectile and target E, I(θ, t) using DSSD, Eγ, Iγ(θ) from Coulomb excitation using HPGe array and considering Doppler correction, (particle)γ-coin; calculated electromagnetic matrix elements, γ-ray yields using CC code GOSIA2, energy vs deformation using IBM-2 with self-consistent constrained HFB with Gogny functional; deduced Coulomb excitation σ, electromagnetic matrix elements using fit to data, B(E2), quadrupole moments, IBM-2 Hamiltonian parameters. 96Kr calculated levels, J, π; deduced shape coexistence.

doi: 10.1016/j.nuclphysa.2013.01.013
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2013NO05      Phys.Rev. C 87, 064313 (2013)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo

Shape evolution and the role of intruder configurations in Hg isotopes within the interacting boson model based on a Gogny energy density functional

NUCLEAR STRUCTURE 172,174,176,178,180,182,184,186,188,190,192,194,196,198,200,202,204Hg; calculated microscopic DIM and mapped potential energy surface contours in (β, γ) plane, single particle energies as function of β2 deformation parameter, levels, J, π, B(E2), spectroscopic quadrupole moments of first two 2+ states, transition quadrupole moments of higher spin states, fraction of intruder 2p-2h configuration, rms charge radii of ground-states, and E0 parameters from excited 0+ states. Shape coexistence and complex shape dynamics in Hg isotopes. Interacting boson model, constrained Hartree-Fock-Bogoliubov (HFB) calculations using the Gogny-D1M energy density functional. Comparison with experimental data.

doi: 10.1103/PhysRevC.87.064313
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2013NO06      J.Phys.:Conf.Ser. 445, 012015 (2013)

K.Nomura

Interacting boson model with energy density functionals

NUCLEAR STRUCTURE 146,148,150,152,154,156Sm; calculated energy surface, deformation, low-lying positive parity levels, J, rotational bands. 232U; calculated rotational bands. IBM and HF plus BCS with Skyrme SkM force; calculations of levels compared with available data.

doi: 10.1088/1742-6596/445/1/012015
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2013NO07      Phys.Rev. C 88, 021303 (2013)

K.Nomura, D.Vretenar, B.-N.Lu

Microscopic analysis of the octupole phase transition in Th isotopes

NUCLEAR STRUCTURE 220,222,224,228,230,232Th; calculated levels, J, π, bands, yrast states, energy surface contours in (β2, β3) plane, E(J)/E(2+) ratios, B(E2), B(E1). Shape phase transition between stable octupole deformation and octupole vibrations. Microscopic framework based on nuclear density functional theory using DD-PC1 interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.88.021303
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2013TH09      Phys.Rev. C 88, 044305 (2013)

T.Thomas, K.Nomura, V.Werner, T.Ahn, N.Cooper, H.Duckwitz, M.Hinton, G.Ilie, J.Jolie, P.Petkov, D.Radeck

Evidence for shape coexistence in 98Mo

NUCLEAR REACTIONS 96Zr(α, 2n), E=16 MeV; measured Eγ, γγ-coin, γγ(θ) using YRAST Ball array at WNSL, Yale facility. 98Mo; deduced levels, J, π, mixing ratios, B(E2). Comparison with IBA model calculations. Shape coexistence and configuration mixing.

NUCLEAR STRUCTURE 96,98,100Mo; calculated potential energy surface contours in (β, γ) plane. 98Mo; calculated levels, J, π, B(E2). Comparison with experimental data. 93,95,97,99Mo; observed γ rays.

doi: 10.1103/PhysRevC.88.044305
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2012AL03      Phys.Rev.Lett. 108, 062701 (2012); Erratum Phys.Rev.Lett. 109, 209904 (2012)

M.Albers, N.Warr, K.Nomura, A.Blazhev, J.Jolie, D.Mucher, B.Bastin, C.Bauer, C.Bernards, L.Bettermann, V.Bildstein, J.Butterworth, M.Cappellazzo, J.Cederkall, D.Cline, I.Darby, S.Das Gupta, J.M.Daugas, T.Davinson, H.De Witte, J.Diriken, D.Filipescu, E.Fiori, C.Fransen, L.P.Gaffney, G.Georgiev, R.Gernhauser, M.Hackstein, S.Heinze, H.Hess, M.Huyse, D.Jenkins, J.Konki, M.Kowalczyk, T.Kroll, R.Krucken, J.Litzinger, R.Lutter, N.Marginean, C.Mihai, K.Moschner, P.Napiorkowski, B.S.Nara Singh, K.Nowak, T.Otsuka, J.Pakarinen, M.Pfeiffer, D.Radeck, P.Reiter, S.Rigby, L.M.Robledo, R.Rodriguez-Guzman, M.Rudigier, P.Sarriguren, M.Scheck, M.Seidlitz, B.Siebeck, G.Simpson, P.Thole, T.Thomas, J.Van de Walle, P.Van Duppen, M.Vermeulen, D.Voulot, R.Wadsworth, F.Wenander, K.Wimmer, K.O.Zell, M.Zielinska

Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

NUCLEAR REACTIONS 194,196Pt(94Kr, 94Kr'), (96Kr, 96Kr'), 285 MeV/nucleon; measured reaction products, Eγ, Iγ. 94,96Kr; deduced J, π, B(E2), spectroscopic quadrupole moments. Comparison with IBM calculations based on the constrained HFB approach using the microscopic Gogny-D1M energy density functional.

doi: 10.1103/PhysRevLett.108.062701
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2012KO17      Phys.Rev. C 85, 054309 (2012)

J.Kotila, K.Nomura, L.Guo, N.Shimizu, T.Otsuka

Shape phase transitions in the interacting boson model: Phenomenological versus microscopic descriptions

NUCLEAR STRUCTURE 148,150,152,154,156,158,160Gd, 150,152,154,156,158,160,162Dy; calculated levels, J, π, B(E2), quadrupole moments for 2+ states, S(2n), potential energy surfaces in β-γ plane, R(first 4+/first 2+) and R(first 6+/second 0+) ratios. Shape phase transitions, X(5) critical-point nuclei. Phenomenological and microscopic proton-neutron interacting boson model (IBM) calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.85.054309
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2012NI04      Hyperfine Interactions 207, 19 (2012)

J.Nishimura, K.Nomura

57Fe conversion electron Mossbauer study of oxidized iron-nickel alloy pins

ATOMIC PHYSICS 57Fe; measured X-ray, ce, Eγ, Iγ; deduced iron oxide layers chemical composition.

doi: 10.1007/s10751-011-0472-8
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2012NO02      Phys.Rev.Lett. 108, 132501 (2012)

K.Nomura, N.Shimizu, D.Vretenar, T.Niksic, T.Otsuka

Robust Regularity in γ-Soft Nuclei and Its Microscopic Realization

NUCLEAR STRUCTURE 134Ba, 192,194,196Pt, 190,192Os, 112Ru; calculated energy and B(E2) ratios, energy surfaces, low-lying energy spectra. Framework of energy density functionals.

doi: 10.1103/PhysRevLett.108.132501
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2012NO03      Hyperfine Interactions 205, 129 (2012)

K.Nomura, A.Rykov, Z.Nemeth, Y.Yoda

Vibration DOS of 57Fe and Zn doped rutile Sn(Sb) oxides

doi: 10.1007/s10751-011-0496-0
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2012NO07      Phys.Rev. C 86, 034322 (2012)

K.Nomura, R.Rodriguez-Guzman, L.M.Robledo, N.Shimizu

Shape coexistence in lead isotopes in the interacting boson model with a Gogny energy density functional

NUCLEAR STRUCTURE 182,184,186,188,190,192Pb; calculated levels, J, π, potential energy surface contours in β-γ plane, B(E2), configuration, spectroscopic quadrupole moments using interacting boson model (IBM) model plus configuration mixing with microscopic input based on the Gogny energy density functional (EDF). Evolution of the shape coexistence in the neutron-deficient lead isotopes. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.034322
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2012UE01      Hyperfine Interactions 208, 19 (2012)

Y.Ueda, K.Nomura, A.I.Rykov

Orbital order in layered manganites probed with 57Fe Mossbauer spectroscopy

ATOMIC PHYSICS 57Fe; measured room temperature Mossbauer spectra; deduced single-site Mossbauer spectra.

doi: 10.1007/s10751-011-0471-9
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2011NO01      Phys.Rev. C 83, 014309 (2011)

K.Nomura, T.Otsuka, R.Rodriguez-Guzman, L.M.Robledo, P.Sarriguren

Structural evolution in Pt isotopes with the interacting boson model Hamiltonian derived from the Gogny energy density functional

NUCLEAR STRUCTURE 172,174,176,178,180,182,184,186,188,190,192,194,196,198,200Pt; calculated potential energy surfaces in the β-γ plane, low-lying spectra of g.s., quasi β and quasi γ bands, B(E2) values, Level schemes for 184,186,188,190,192,194Pt nuclei. Interacting boson model (IBM) Hamiltonian from constrained Hartree-Fock-Bogoliubov (HFB) calculations with the finite range and density-dependent Gogny-D1S energy density functional. Shape transition in Pt nuclei. Comparison with experimental data.

doi: 10.1103/PhysRevC.83.014309
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2011NO04      Phys.Rev. C 83, 041302 (2011); Pub.Note Phys.Rev. C 83, 059901 (2011)

K.Nomura, T.Otsuka, N.Shimizu, L.Guo

Microscopic formulation of the interacting boson model for rotational nuclei

NUCLEAR STRUCTURE 146,148,150,152,154Sm, 230,232,234,236,238U; calculated overlap between the intrinsic state and its rotation angle, and moments of inertia. 146,148,150,152,154Sm, 148,150,152,154,156,158,160Gd, 230Th, 232U; calculated yrast spectra of ground state rotational bands, J, π. Interacting boson model for rotational nuclei with axially symmetric strong deformation. Comparison with experimental data.

doi: 10.1103/PhysRevC.83.041302
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2011NO05      Phys.Rev. C 83, 054303 (2011)

K.Nomura, T.Otsuka, R.Rodriguez-Guzman, L.M.Robledo, P.Sarriguren, P.H.Regan, P.D.Stevenson, Zs.Podolyak

Spectroscopic calculations of the low-lying structure in exotic Os and W isotopes

NUCLEAR STRUCTURE 186,188,190,192,194,196,198Os, 184,186,188,190,192,194,196W; calculated levels, J, π, B(E2), potential energy surfaces, g.s. and quasi γ bands. Interacting boson model (IBM) Hamiltonian determined by (constrained) Hartree-Fock-Bogoliubov calculations with the Gogny-D1S energy density functional (EDF). Comparison with experimental data.

doi: 10.1103/PhysRevC.83.054303
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2011NO09      Phys.Rev. C 84, 014302 (2011)

K.Nomura, T.Niksic, T.Otsuka, N.Shimizu, D.Vretenar

Quadrupole collective dynamics from energy density functionals: Collective Hamiltonian and the interacting boson model

NUCLEAR STRUCTURE 192,194,196Pt; calculated maps of binding energies, and squares of wave functions in the β-γ deformation plane, levels, J, π, g.s. and γ-vibrational bands. Energy density functionals (DD-PC1), and Interacting Boson model applied to quadrupole collective correlations. Comparison with experimental data.

doi: 10.1103/PhysRevC.84.014302
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2011NO15      Phys.Rev. C 84, 054316 (2011)

K.Nomura, T.Otsuka, R.Rodriguez-Guzmin, L.M.Robledo, P.Sarriguren

Collective structural evolution in neutron-rich Yb, Hf, W, Os, and Pt isotopes

NUCLEAR STRUCTURE 180,182,184,186,188,190,192Yb, 182,184,186,188,190,192,194Hf, 184,186,188,190,192,194,196W, 186,188,190,192,194,196,198Os, 188,190,192,194,196,198,200Pt; calculated potential energy surfaces, ground-state correlation energies, moments of inertia, low-lying levels, J, π, B(E2) ratios. Interacting-boson-model (IBM) Hamiltonian from constrained Hartree-Fock-Bogoliubov calculations with the Gogny-DIM energy density functional. Comparison with experimental data.

doi: 10.1103/PhysRevC.84.054316
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2010NO01      Phys.Rev. C 81, 044307 (2010)

K.Nomura, N.Shimizu, T.Otsuka

Formulating the interacting boson model by mean-field methods

NUCLEAR STRUCTURE 146,148,150,152,154,156Sm, 110,112,114,116,118,120,122,124,126,128,130,132,134,136Ba, 108,110,112,114,116,118,120,122,124,126,128,130,132,134Xe, 98,100,102,104,106,108,110,112,114,116,118,120,122,124Ru, 100,102,104,106,108,110,112,114,116,118,120,122,124,126Pd, 204,206,208,210,212,214W, 206,208,210,212,214,216Os; calculated potential energy surfaces, levels, J, π, two-neutron separation energies, and B(E2) ratios using interacting boson model (IBM) and Skyrme HF mean-field model using SLy4 and SkM* interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.81.044307
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2009NO05      Acta Phys.Pol. B40, 603 (2009)

K.Nomura, N.Shimizu, T.Otsuka

New Formulation of Interacting Boson Model and Heavy Exotic Nuclei


2008NO05      Phys.Rev.Lett. 101, 142501 (2008)

K.Nomura, N.Shimizu, T.Otsuka

Mean-Field Derivation of the Interacting Boson Model Hamiltonian and Exotic Nuclei

NUCLEAR STRUCTURE 134Ba; calculated level energies, J, π, deformation parameters using the IBM. W, Sm; calculated level energies, deformation parameters using the IBM.

doi: 10.1103/PhysRevLett.101.142501
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2005RY07      Hyperfine Interactions 163, 29 (2005)

A.I.Rykov, I.A.Rykov, K.Nomura, X.Zhang

Frequency Spectra of Quantum Beats in Nuclear Forward Scattering of 57Fe: The Mossbauer Spectroscopy with Superior Energy Resolution

NUCLEAR REACTIONS 57Fe(γ, γ'), E=low; measured nuclear forward scattering and Mossbauer spectra.

doi: 10.1007/s10751-004-4569-1
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2003UM01      Nucl.Phys. A721, 922c (2003)

T.Umeda, H.Matsufuru, O.Miyamura, K.Nomura

Charmonium near the deconfining transition on the lattice

doi: 10.1016/S0375-9474(03)01243-0
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