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NSR database version of April 11, 2024.

Search: Author = M.Isaka

Found 27 matches.

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2023MY05      Phys.Rev. C 108, 064314 (2023)

T.Myo, M.Lyu, Q.Zhao, M.Isaka, N.Wan, H.Takemoto, H.Horiuchi

Variation of multi-Slater determinants in antisymmetrized molecular dynamics and its application to 10Be with various clustering

doi: 10.1103/PhysRevC.108.064314
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2023TA08      Phys.Rev. C 107, 044304 (2023)

H.Takemoto, T.Myo, H.Horiuchi, H.Toki, M.Isaka, M.Lyu, Q.Zhao, N.Wan

Appearance of the Hoyle state and its breathing mode in 12C despite strong short-range repulsion of the nucleon-nucleon potential

NUCLEAR STRUCTURE 8Be; calculated trajectories of the eigenstates of 0+ and 2+, energy and rms radius of the ground state. 12C; calculated levels, J, π, rms radii and energies of the monopole transition of the nine lowest eigenstates, monopole transition matrix elements, trajectories of the eigenstates of 0+. Calculations using 3α cluster model (Bloch–Brink wave function) using the AV4P potential, which has a strong repulsive core. Comparison to experimental data and other theoretical calculations.

doi: 10.1103/PhysRevC.107.044304
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2022HI11      Phys.Rev. C 106, 064318 (2022)

E.Hiyama, M.Isaka, T.Doi, T.Hatsuda

Probing the ΞN interaction through inversion of spin-doublets in ΞNαα nuclei

NUCLEAR STRUCTURE 5He, 9Be; calculated energy levels for ΞNα and ΞΝαα hypernuclei, phase shifts, density distributions of α, Ξ and the valence nucleon N. Found evidences of spin doublet bound state in ΞNαα, while pointed that it's unlikely that ΞNα has bound states. Calculations using Gaussian expansion method (GEM) for three-and four-body cluster models and the ΞN potential obtained from lattice QCD.

doi: 10.1103/PhysRevC.106.064318
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2022IS08      Phys.Rev. C 106, 044310 (2022)

M.Isaka, Q.Zhao, T.Myo, M.Lyu, H.Toki, H.Horiuchi, H.Takemoto, N.Wan

Role of spatially compact nucleon wave packets in an ab initio description of 3H within high-momentum antisymmetrized molecular dynamics

NUCLEAR STRUCTURE 3H; calculated total energy, rms radii. Calculations describing the nucleon correlations by utilizing high-momentum antisymmetrized molecular dynamics (HM-AMD) with Argonne V8' potential. Comparison of the results with and without the spinparallel configuration. Comparison to other theoretical calculations.

doi: 10.1103/PhysRevC.106.044310
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2022MY01      Phys.Rev. C 105, 014317 (2022)

T.Myo, M.Lyu, H.Toki, H.Horiuchi, Q.Zhao, M.Isaka, H.Takemoto, N.Wan

New many-body method using cluster expansion diagrams with tensor-optimized antisymmetrized molecular dynamics

NUCLEAR STRUCTURE 3H, 4He; calculated total energy and Hamiltonian components of the kinetic energy, central force, and tensor force using a new variational method of tensor optimized antisymmetrized molecular dynamics (New-TOAMD) with AV6' potential. Comparison with other theoretical calculations such as TOAMD, Green's function Monte Carlo (GFMC) and Faddeev-Yakubovsky (FY).

doi: 10.1103/PhysRevC.105.014317
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2022WA32      Phys.Rev. C 106, 034308 (2022)

N.Wan, T.Myo, H.Takemoto, H.Toki, C.Xu, H.Horiuchi, M.Isaka, M.Lyu, Q.Zhao

Finite particle-number description of symmetric nuclear matter with spin excitations of high-momentum pairs induced by the tensor force

doi: 10.1103/PhysRevC.106.034308
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2021ZH34      Prog.Theor.Exp.Phys. 2021, 063D02 (2021)

Q.Zhao, M.Isaka, T.Myo, M.Lyu, H.Toki, H.Horiuchi, H.Takemoto, N.Wan

Role of the unitary correlation operator on high-momentum antisymmetrized molecular dynamics using the bare NN interaction for 3H and 4He

NUCLEAR STRUCTURE 3H, 4He; calculated binding energies using high-momentum antisymmetrized molecular dynamics (HMAMD) by incorporating the short-range part of the unitary correlation operator method (UCOM) as the variational method.

doi: 10.1093/ptep/ptab058
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2020IS02      Phys.Rev. C 101, 024301 (2020)

M.Isaka, Y.Yamamoto, T.Motoba

Low-lying level structure of Λ hypernuclei and spin dependence of the ΛN interaction with antisymmetrized molecular dynamics

NUCLEAR STRUCTURE 6,8Li, 8,9Be, 9,10B, 12,13C, 14N, 15O; calculated levels, J, π of core nuclei of hypernuclei. 4He, 7,9Li, 9,10Be, 10,11B, 12,13C, 15N, 16O; calculated levels, J, π, binding energies, spin-spin and spin-orbit splittings of the p-shell hypernuclei within the framework of Hyper-antisymmetrized molecular dynamics (HyperAMD) with the ΛN G-matrix interaction derived from the baryon-baryon interaction, extended soft core (ESC) model. Comparison with experimental data.

doi: 10.1103/PhysRevC.101.024301
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2019KA31      Prog.Theor.Exp.Phys. 2019, 073D01 (2019)

Y.Kanada-En'yo, M.Isaka, T.Motoba

Energy spectra in p-shell Λ hypernuclei and 19ΛF and spin-dependent ΛN interactions

NUCLEAR STRUCTURE 19F; analyzed available data; calculated hypernuclei energies, J, π.

doi: 10.1093/ptep/ptz054
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2019ZH14      Phys.Rev. C 99, 034311 (2019)

Q.Zhao, M.Lyu, Z.Ren, T.Myo, H.Toki, K.Ikeda, H.Horiuchi, M.Isaka, T.Yamada

Contact representation of short-range correlation in light nuclei studied by the high-momentum antisymmetrized molecular dynamics

NUCLEAR STRUCTURE 3H; calculated total energy and Hamiltonian components of the total energy using high-momentum antisymmetrized molecular dynamics (HMAMD) with AV4' central potential; deduced a contact representation of high momentum components of short-range correlation between nucleons. Comparison with authors' previous theoretical approaches.

doi: 10.1103/PhysRevC.99.034311
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2018LY08      Phys.Rev. C 98, 064002 (2018)

M.Lyu, T.Myo, M.Isaka, H.Toki, K.Ikeda, H.Horiuchi, T.Suhara, T.Yamada

Tensor-optimized high-momentum antisymmetrized molecular dynamics with a bare interaction, and its application to the 4He nucleus

NUCLEAR STRUCTURE 3H, 4He; calculated nucleon-nucleon correlations, total energy, Hamiltonian components, rms radius of 4He, and energy convergence of 3H, and 4He using tensor-optimized high-momentum antisymmetrized molecular dynamics (TO-HMAMD) framework. Comparison with other AMD-based theoretical calculations.

doi: 10.1103/PhysRevC.98.064002
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2017FU10      Phys.Lett. B 773, 336 (2017)

Y.Funaki, M.Isaka, E.Hiyama, T.Yamada, K.Ikeda

Multi-cluster dynamics in 13ΛC and analogy to clustering in 12C

NUCLEAR STRUCTURE 12,13C; calculated hypernuclei level energies, J, π, rms radii, parameters. Comparison with available data.

doi: 10.1016/j.physletb.2017.08.048
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2017IS05      Phys.Rev. C 95, 044308 (2017)

M.Isaka, Y.Yamamoto, Th.A.Rijken

Effects of a hyperonic many-body force on BΛ values of hypernuclei

NUCLEAR STRUCTURE 9Li, 9,10Be, 9,10,11,12B, 12,13,14C, 15N, 16,19O, 21Ne, 25,27Mg, 28Si, 32S, 40,48K, 40,41Ca, 51V, 59Fe; calculated mass dependence of binding energies of hypernuclei by adding strongly repulsive many-body effects (MBE) to the strongly repulsive multi-Pomeron exchange potential (MPP). Equation of state (EoS) of hyperon-mixed neutron-star matter. Antisymmetrized molecular dynamics for hypernuclei (HyperAMD) framework using ΛN G-matrix interactions from ESC14 and ESC12.

doi: 10.1103/PhysRevC.95.044308
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2016IS11      Phys.Rev. C 94, 044310 (2016)

M.Isaka, Y.Yamamoto, Th.A.Rijken

Competing effects of nuclear deformation and density dependence of the ΛN interaction in BΛ values of hypernuclei

NUCLEAR STRUCTURE 9Li, 9,10Be, 9,10,11,12B, 12,13,14C, 15N, 16,19O, 21Ne, 25,27Mg, 28Si, 32S, 40,48K, 40,41Ca, 51V, 59Fe; calculated binding energies and quadrupole deformation parameters for hypernuclei, effect of deformation. Microscopic calculations based on baryon-baryon interaction extended soft core (ESC) model including many-body effects, and using G-matrix interaction. Comparison with experimental binding energies for hypernuclei.

doi: 10.1103/PhysRevC.94.044310
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2015HI04      Phys.Rev. C 91, 054316 (2015)

E.Hiyama, M.Isaka, M.Kamimura, T.Myo, T.Motoba

Resonant states of the neutron-rich Λ hypernucleus 7ΛHe

NUCLEAR STRUCTURE 6He; calculated levels, J, π, widths. 7He; calculated levels, J, π, widths of hypernucleus in the framework of α+Λ+n+n four-body cluster model. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.054316
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2015HO01      Phys.Rev. C 91, 014314 (2015)

H.Homma, M.Isaka, M.Kimura

Parity reversal of 12ΛBe

NUCLEAR STRUCTURE 11,12Be; calculated levels, J, π, matter and proton density distributions, binding and excitation energies, matter quadrupole deformation β, and root-mean-square radii for the bandhead states in 11Be and hypernucleus 12Be. Calculations used extended version of antisymmetrized molecular dynamics (AMD) for hypernuclei. Comparison with available experimental results.

doi: 10.1103/PhysRevC.91.014314
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2015IS10      Prog.Theor.Exp.Phys. 2015, 103D02 (2015)

M.Isaka, M.Kimura, E.Hiyama, H.Sagawa

Superdeformation of Ar hypernuclei

NUCLEAR STRUCTURE 37,39,41Ar; calculated separation energies of the ground and superdeformed (SD) states in hypernuclei. Framework of antisymmetrized molecular dynamics (AMD).

doi: 10.1093/ptep/ptv138
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2015IS11      Phys.Rev. C 92, 044326 (2015)

M.Isaka, M.Kimura

Impurity effects of the Λ particle on the 2α cluster states of 9Be and 10Be

NUCLEAR STRUCTURE 9,10,11Be; calculated levels, J, π, matter quadrupole deformation, nuclear and proton density distributions, proton, neutron and matter rms radii, binding energies, B(E2), 2α cluster structures for 9,10Be normal nuclei and 10,11Be hypernuclei. Antisymmetrized molecular dynamics for hypernuclei (HyperAMD model). Comparison with available experimental data.

doi: 10.1103/PhysRevC.92.044326
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2014IS02      Phys.Rev. C 89, 024310 (2014)

M.Isaka, K.Fukukawa, M.Kimura, E.Hiyama, H.Sagawa, Y.Yamamoto

Superdeformed Λ hypernuclei with antisymmetrized molecular dynamics

NUCLEAR STRUCTURE 41Ca, 46,48Sc; calculated levels, J, π, deformation parameters, B(E2), Λ-N interaction strength, Λ-separation, rms radii, intrinsic density distributions, normal and superdeformed bands, electric quadrupole moments for hypernuclei. 40Ca, 45,47Sc; calculated levels, J, π, normal and superdeformed bands, intrinsic density distributions. Deformed basis antisymmetrized molecular dynamics (AMD) model with the generator coordinate method (GCM). Comparison with experimental data.

doi: 10.1103/PhysRevC.89.024310
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2013IS03      Phys.Rev. C 87, 021304 (2013)

M.Isaka, M.Kimura, A.Dote, A.Ohnishi

Splitting of the p orbit in triaxially deformed Λ25MG

NUCLEAR STRUCTURE 25Mg; calculated levels, J, π, rotational bands, single-particle energy contours in β-γ plane, Intraband B(E2) for hypernucleus relative to 24Mg nucleus. Hyper-antisymmetrized molecular dynamics calculations.

doi: 10.1103/PhysRevC.87.021304
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2013IS11      Nucl.Phys. A914, 189c (2013)

M.Isaka, M.Kimura, A.Dote, A.Ohnishi

Excited states with Λ hyperon in p-orbit in 25ΛMg

NUCLEAR STRUCTURE 25Mg; calculated Λ hypernucleus levels, J, π, bands, deformation using antisymmetrized molecular dynamics.

doi: 10.1016/j.nuclphysa.2013.01.027
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2012IS02      Phys.Rev. C 85, 034303 (2012)

M.Isaka, H.Homma, M.Kimura, A.Dote, A.Ohnishi

Modification of triaxial deformation and change of spectrum in Λ 25Mg caused by the Λ hyperon

NUCLEAR STRUCTURE 25Mg; calculated levels, J, π, bands, density distribution, and β-γ surface contours, deformation parameters, B(E2) values of hypernucleus. Antisymmetrized molecular dynamics for hypernucleus (HyperAMD) and Generator coordinate method (GCM). 24Mg; calculated levels, J, π, bands, density distribution, and β-γ surface contours, deformation parameters, B(E2) values. Antisymmetrized molecular dynamics, and Generator coordinate method (GCM). Comparison with experimental data.

doi: 10.1103/PhysRevC.85.034303
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2012KI05      Prog.Theor.Phys.(Kyoto) 127, 287 (2012)

M.Kimura, R.Yoshida, M.Isaka

Excitation and Structure Change of 24Mg. I - Triaxial Deformed Mean Field in Low-Lying States -

NUCLEAR STRUCTURE 24Mg; calculated level energies, J, π, γ-deformation, bands. Antisymmetrized molecular dynamics with Cogny effective interaction.

doi: 10.1143/PTP.127.287
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2011IS02      Phys.Rev. C 83, 044323 (2011)

M.Isaka, M.Kimura, A.Dote, A.Ohnishi

Deformation of hypernuclei studied with antisymmetrized molecular dynamics

NUCLEAR STRUCTURE 8,9Be, 12,13C, 19,20,21Ne; calculated energy curves, total energies and binding energies, rms radii as function of β and γ deformation parameters, and density plots for hypernuclei using antisymmetrized molecular dynamics (HyperAMD) for structure of p-sd shell hypernuclei. Possibility of parity inversion in 20Ne hypernucleus.

doi: 10.1103/PhysRevC.83.044323
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2011IS03      Phys.Rev. C 83, 054304 (2011)

M.Isaka, M.Kimura, A.Dote, A.Ohnishi

Shell and cluster states of 21ΛNe studied with antisymmetrized molecular dynamics

NUCLEAR STRUCTURE 21Ne; calculated levels, J, π, K=0+ and 0- bands, B(E2), rms radii, density distributions of hypernucleus. Antisymmetrized molecular dynamics (AMD) for hypernuclei. Comparison with AMD calculations for levels, J, π, bands in 20Ne. Cluster structure.

doi: 10.1103/PhysRevC.83.054304
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2011IS07      Int.J.Mod.Phys. E20, 859 (2011)

M.Isaka, H.Honma, M.Kimura, A.Dote, K.Ohnishi

Impurity effects in 12ΛBe and 21ΛNe hypernuclei

NUCLEAR STRUCTURE 11,12Be, 20,21Ne; calculated energies, J, π , B(E2) for low-lying states in hypernuclei, α+16O cluster bands, rms radii.

doi: 10.1142/S0218301311018848
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2010MA71      Nucl.Phys. A835, 366c (2010)

H.Matsumiya, K.Tsubakihara, M.Isaka, M.Kimura, A.Dote, A.Ohnishi

Spin-dependence of the Ξ-N interaction and the Ξ hypernuclear production spectrum

NUCLEAR STRUCTURE 12Be; calculated Ξ hypernucleus levels, J, π using different interactions. 12C; calculated Λ hypernucleus quadrupole deformation energy.

doi: 10.1016/j.nuclphysa.2010.01.220
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