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NSR database version of May 19, 2024.

Search: Author = R.Okamoto

Found 35 matches.

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2019MI17      Phys.Rev. C 100, 034310 (2019)

T.Miyagi, T.Abe, M.Kohno, P.Navratil, R.Okamoto, T.Otsuka, N.Shimizu, S.R.Stroberg

Ground-state properties of doubly magic nuclei from the unitary-model-operator approach with chiral two- and three-nucleon forces

NUCLEAR STRUCTURE 4He, 16O, 40Ca; calculated ground-state energies, root-mean square (rms) radii, charge radii. Unitary-model-operator approach (UMOA), with similarity renormalization group (SRG) evolved nucleon-nucleon (NN) and three-nucleon (3N) interactions based on chiral effective field theory. Comparison with experimental data.

doi: 10.1103/PhysRevC.100.034310
Citations: PlumX Metrics


2018SK01      Phys.Rev. C 97, 014002 (2018)

R.Skibinski, J.Golak, K.Topolnicki, H.Witala, Yu.Volkotrub, H.Kamada, A.M.Shirokov, R.Okamoto, K.Suzuki, J.P.Vary

Nucleon-deuteron scattering with the JISP16 potential

NUCLEAR REACTIONS 2H(polarized p, p), (polarized n, n), (n, p), (polarized p, 2p), 1H(polarized d, d), E=5, 13, 65, 135 MeV; calculated differential elastic σ(θ), deuteron vector and tensor analyzing powers iT11, T22, differential cross section for deuteron breakup process. Nucleon-nucleon J-matrix inverse scattering potential JISP16 for elastic nucleon-deuteron scattering and the deuteron breakup process using the formalism of Faddeev equations. Comparison with experimental data, and with theoretical calculations using CD Bonn, Argonne AV18, and the chiral forces.

NUCLEAR STRUCTURE 2H; calculated ground state energies, 3S1 and 3D1 state probabilities for deuteron, potential and kinetic energies for various NN interactions. 3H; calculated binding energy, potential and kinetic energies for various NN interactions.

doi: 10.1103/PhysRevC.97.014002
Citations: PlumX Metrics


2017MI18      Phys.Rev. C 96, 054312 (2017)

T.Miyagi, T.Abe, R.Okamoto, T.Otsuka

Introduction of the one-body correlation operator in the unitary-model-operator approach

NUCLEAR STRUCTURE 4He; calculated ground-state energy, point-nucleon rms matter radii, total, one-body, two-body, and three-body energies, One-body density matrix using nucleon-nucleon (NN) interactions from Argonne (AV18) and chiral effective field theory (χEFT) up to the next-to-next-to-next leading order (N3LO), and Unitary-model-operator approach (UMOA) with one-body correlations, and diagonalization of unitary-transformed Hamiltonians in the 0p0h and 1p1h space.

doi: 10.1103/PhysRevC.96.054312
Citations: PlumX Metrics


2015MI09      Prog.Theor.Exp.Phys. 2015, 041D01 (2015)

T.Miyagi, T.Abe, Ry.Okamoto, T.Otsuka

Ground-state energies and charge radii of 4He, 16O, 40Ca, and 56Ni in the unitary-model-operator approach

NUCLEAR STRUCTURE 4He, 16O, 40Ca, 56Ni; calculated ground state energies, charge radii. Unitary-model-operator approach, comparison with experimental data.

doi: 10.1093/ptep/ptv042
Citations: PlumX Metrics


2014SU08      Phys.Rev. C 89, 044003 (2014)

K.Suzuki, H.Kumagai, R.Okamoto, M.Matsuzaki

Recursion method for deriving an energy-independent effective interaction

doi: 10.1103/PhysRevC.89.044003
Citations: PlumX Metrics


2013SU06      Phys.Rev. C 87, 024001 (2013)

K.Suzuki, H.Kumagai, M.Matsuzaki, R.Okamoto

Formulation of an effective interaction in terms of renormalized vertices and propagators

doi: 10.1103/PhysRevC.87.024001
Citations: PlumX Metrics


2012KO27      Phys.Rev. C 86, 014317 (2012)

M.Kohno, R.Okamoto

4He energies and radii calculated by the coupled-cluster method with a many-body average potential

NUCLEAR STRUCTURE 4He; calculated ground state energies, rms radii. Coupled-cluster method (CCM) calculations with AV18 and CD-Bonn interactions. Contribution of the three-nucleon force to the ground-state energy.

doi: 10.1103/PhysRevC.86.014317
Citations: PlumX Metrics


2011SU06      Phys.Rev. C 83, 024304 (2011)

K.Suzuki, R.Okamoto, H.Kumagai, S.Fujii

Graphical method for deriving an effective interaction with a new vertex function

doi: 10.1103/PhysRevC.83.024304
Citations: PlumX Metrics


2009FU10      Phys.Rev.Lett. 103, 182501 (2009)

S.Fujii, R.Okamoto, K.Suzuki

Ground-State and Single-Particle Energies of Nuclei around 16O, 40Ca, and 56Ni from Realistic Nucleon-Nucleon Forces

NUCLEAR STRUCTURE 16O, 40Ca, 56Ni; calculated ground and single-particle states, binding energies in ab initio approach; deduced agreement between CD-Bonn nucleon-nucleon potential and experimental results.

doi: 10.1103/PhysRevLett.103.182501
Citations: PlumX Metrics


2007KA42      Nucl.Phys. A790, 398c (2007)

H.Kamada, S.Fujii, E.Uzu, M.Yamaguchi, R.Okamoto, Y.Koike

Low-momentum nucleon-nucleon potential and its separability

NUCLEAR STRUCTURE 3H; calculated binding energy; analyzed dependence on cutoff parameter. Low-momentum effective potential.

doi: 10.1016/j.nuclphysa.2007.03.070
Citations: PlumX Metrics


2007KO72      Phys.Rev. C 76, 064002 (2007)

M.Kohno, R.Okamoto, H.Kamada, Y.Fujiwara

Equivalent hyperon-nucleon interactions in low-momentum space

doi: 10.1103/PhysRevC.76.064002
Citations: PlumX Metrics


2006KA18      Prog.Theor.Phys.(Kyoto) 115, 839 (2006)

H.Kamada, S.Fujii, E.Uzu, M.Yamaguchi, R.Okamoto, Y.Koike

Separability of a Low-Momentum Effective Nucleon-Nucleon Potential

NUCLEAR STRUCTURE 3H; calculated binding energy.

doi: 10.1143/PTP.115.839
Citations: PlumX Metrics


2005OK01      Int.J.Mod.Phys. E14, 21 (2005)

R.Okamoto, S.Fujii, K.Suzuki

Formal relation among various hermitian and non-hermitian effective interactions

doi: 10.1142/S0218301305002734
Citations: PlumX Metrics


2004FU04      Phys.Rev. C 69, 034328 (2004)

S.Fujii, R.Okamoto, K.Suzuki

Charge-dependent calculations of single-particle energies in nuclei around 16O with modern nucleon-nucleon interactions

NUCLEAR STRUCTURE 3H, 3,4He; calculated binding energies. 15N, 15,16,17O, 17F; calculated single-particle energies, spin-orbit splitting. Comparisons with data.

doi: 10.1103/PhysRevC.69.034328
Citations: PlumX Metrics


2004FU20      Phys.Rev. C 70, 024003 (2004)

S.Fujii, E.Epelbaum, H.Kamada, R.Okamoto, K.Suzuki, W.Glockle

Low-momentum nucleon-nucleon interaction and its application to few-nucleon systems

NUCLEAR STRUCTURE 2H; calculated binding energy, D-state probability. 3H, 4He; calculated binding energies, cutoff parameter dependences.

doi: 10.1103/PhysRevC.70.024003
Citations: PlumX Metrics


2002FU18      Phys.Rev. C 66, 054301 (2002)

S.Fujii, R.Okamoto, K.Suzuki

Shell-model calculations for Λ16O and Λ17O using microscopic effective interactions with Σ degrees of freedom

NUCLEAR STRUCTURE 16,17O; calculated hypernucleus levels, J, π, configurations. Shell model.

doi: 10.1103/PhysRevC.66.054301
Citations: PlumX Metrics


2000FU05      Nucl.Phys. A670, 277c (2000)

S.Fujii, R.Okamoto, K.Suzuki

Lambda-Nucleon Effective Interaction in Unitary-Model Operator Approach

NUCLEAR STRUCTURE 17O; calculated hypernucleus single-particle levels, related features.

doi: 10.1016/S0375-9474(00)00112-3
Citations: PlumX Metrics


2000FU11      Prog.Theor.Phys.(Kyoto) 104, 123 (2000)

S.Fujii, R.Okamoto, K.Suzuki

Three-Body Cluster Effects on Λ Single-Particle Energies in Λ17O and Λ41Ca

NUCLEAR STRUCTURE 17O, 41Ca; calculated Λ hyperon single-particle energies, three-body cluster effects.. Unitary-model-operator approach.

doi: 10.1143/PTP.104.123
Citations: PlumX Metrics


2000SU03      Nucl.Phys. A665, 92 (2000)

K.Suzuki, R.Okamoto, M.Kohno, S.Nagata

Exact Treatment of the Pauli Exclusion Operator in Nuclear Matter Calculation

doi: 10.1016/S0375-9474(99)00399-1
Citations: PlumX Metrics


1999FU06      Nucl.Phys. A651, 411 (1999); Erratum Nucl.Phys. A676, 475 (2000)

S.Fujii, R.Okamoto, K.Suzuki

Unitary-Model-Operator Approach to Λ Hypernuclei

NUCLEAR STRUCTURE 17O; calculated hypernucleus single-particle energies, matrix elements. Unitary-model-operator approach.

doi: 10.1016/S0375-9474(99)00139-6
Citations: PlumX Metrics


1997HA35      Prog.Theor.Phys.(Kyoto) 97, 417 (1997); Erratum Prog.Theor.Phys.(Kyoto) 98, 1011 (1997)

M.Hasegawa, S.Tazaki, R.Okamoto

Instability of the HF Ground State in 56Ni Caused by α-Like Four-Nucleon Correlations

NUCLEAR STRUCTURE 56Ni; calculated ground-state stability conditions with respect to 4p-4h excitations; deduced instability. Hartree-Fock calculations.

doi: 10.1143/PTP.97.417
Citations: PlumX Metrics


1997KU32      Prog.Theor.Phys.(Kyoto) 97, 1023 (1997)

H.Kumagai, K.Suzuki, R.Okamoto

Ground-State Properties of 40Ca in Unitary-Model-Operator Approach with Realistic Nucleon-Nucleon Potentials

NUCLEAR STRUCTURE 40Ca; calculated ground state, single-particle energies, charge radius. Unitary-model-operator approach.

doi: 10.1143/PTP.97.1023
Citations: PlumX Metrics


1995HA21      Nucl.Phys. A592, 45 (1995)

M.Hasegawa, S.Tazaki, R.Okamoto

Condensed Structure of J = T = 0 α-Like Clusters in f7/2-Shell Even-Even Nuclei with N = Z

NUCLEAR STRUCTURE 44Ti, 48Ca, 52Fe, 56Ni; calculated single particle levels approximate occupation probabilities; deduced α-like correlations related features. Microscopic approach.

doi: 10.1016/0375-9474(95)00296-D
Citations: PlumX Metrics


1995KU02      Nucl.Phys. A582, 205 (1995)

T.T.S.Kuo, F.Krmpotic, K.Suzuki, R.Okamoto

Summation of Time-Dependent Folded Diagrams for Effective Interactions with a Non-Degenerate Model Space

doi: 10.1016/0375-9474(94)00456-W
Citations: PlumX Metrics


1995SU32      Prog.Theor.Phys.(Kyoto) 93, 905 (1995)

K.Suzuki, R.Okamoto

Effective Operators in Time-Independent Approach

doi: 10.1143/ptp/93.5.905
Citations: PlumX Metrics


1994DE16      Nucl.Phys. A575, 46 (1994)

H.de Guise, D.J.Rowe, R.Okamoto

The Role of Spin in the Strong Coupling of a Rotor and Single Particle

doi: 10.1016/0375-9474(94)90136-8
Citations: PlumX Metrics


1994SU25      Nucl.Phys. A580, 213 (1994)

K.Suzuki, R.Okamoto, H.Kumagai

Many-Body Theory in Terms of Effective Interactions and Its Relation to Coupled-Cluster Method

doi: 10.1016/0375-9474(94)90770-6
Citations: PlumX Metrics


1994SU35      Prog.Theor.Phys.(Kyoto) 92, 1045 (1994)

K.Suzuki, R.Okamoto

Effective Interaction Theory and Unitary-Model-Operator Approach to Nuclear Saturation Problem

NUCLEAR STRUCTURE 16O; calculated binding energy per nucleon, charge radii, single particle energies, l.s splitting. Unitary model operator approach, different potentials.

doi: 10.1143/ptp/92.6.1045
Citations: PlumX Metrics


1987SU08      Prog.Theor.Phys.(Kyoto) 77, 196 (1987)

K.Suzuki, R.Okamoto, H.Kumagai

Effects of Self-Consistent Single-Particle Potential on Nuclear Effective Interaction

NUCLEAR STRUCTURE 16O; calculated ground-state, 1p1/2, 1p3/2 orbit one-body energies; deduced self-consistent potential role. Unitary model operator approach.

doi: 10.1143/PTP.77.196
Citations: PlumX Metrics


1987SU12      Phys.Rev. C36, 804 (1987)

K.Suzuki, R.Okamoto, H.Kumagai

Nuclear Ground-State Properties and Nuclear Forces in Unitary-Model-Operator Approach: Application to 16O

NUCLEAR STRUCTURE 16O; calculated binding energy, charge radius, single-particle energies. Unitary model operator approach.

doi: 10.1103/PhysRevC.36.804
Citations: PlumX Metrics


1986SU13      Prog.Theor.Phys.(Kyoto) 75, 1388 (1986)

K.Suzuki, R.Okamoto

Unitary-Model-Operator Approach to Nuclear Many-Body Problem. I - The Ground-State and One-Body Energies of 16O -

NUCLEAR STRUCTURE 16O; calculated ground state, single particle energies. Unitary model operator approach.

doi: 10.1143/PTP.75.1388
Citations: PlumX Metrics


1986SU16      Prog.Theor.Phys.(Kyoto) 76, 127 (1986)

K.Suzuki, R.Okamoto

Unitary-Model-Operator Approach to Nuclear Many-Body Problem. II. - Three-Body-Cluster Effects on Properties of 16O -

NUCLEAR STRUCTURE 16O; calculated ground, one-body state energies. 16O deduced three body cluster effects. Unitary model operator approach.

doi: 10.1143/PTP.76.127
Citations: PlumX Metrics


1977OK04      Progr.Theor.Phys. 58, 376 (1977)

R.Okamoto

Low-Lying Collective States in Odd-Mass I, Cs, La and Pr N = 80 Isotones

NUCLEAR STRUCTURE 133I, 135Cs, 137La, 139Pr; calculated low-lying collective states.

doi: 10.1143/PTP.58.376
Citations: PlumX Metrics


1975KU11      Progr.Theor.Phys. 53, 489 (1975)

A.Kuriyama, T.Marumori, K.Matsuyanagi, R.Okamoto

Microscopic Structure of a New Type of Collective Excitation in Odd-Mass Mo, Ru, I, Cs and La Isotopes

NUCLEAR STRUCTURE 129,131I, 131,133Cs, 133,135La, 95,97,99Mo, 97,99,101Ru; calculated B(E2).

doi: 10.1143/PTP.53.489
Citations: PlumX Metrics


1971KU28      Progr.Theor.Phys. 46, 1420 (1971)

A.Kuriyama, M.Hasegawa, S.Tazaki, R.Okamoto

A Note on Pairing Vibrational Motion

doi: 10.1143/PTP.46.1420
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