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NSR database version of April 11, 2024.

Search: Author = K.Washiyama

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2024WA10      Phys.Rev. C 109, 024317 (2024)

K.Washiyama, Sh.Ebata, K.Yoshida

Evolution of the giant monopole resonance with triaxial deformation

doi: 10.1103/PhysRevC.109.024317
Citations: PlumX Metrics

2023WA20      Phys.Rev. C 108, 014323 (2023)

K.Washiyama, K.Yoshida

Triaxial-shape dynamics in the low-lying excited 0+ state: Role of the collective mass

NUCLEAR STRUCTURE 42,44,46S, 40,42,44Si, 38,40,42Mg, 134Ba, 136Ce, 138Nd, 140Sm, 142Gd; calculated potential energy surface in β-γ plane. 44,46S; calculated low-lying levels, J, π, transitions, B(E2), vibrational wave functions of the first and second 0+ states. 42Mg, 40Si, 44,46S, 134Ba, 136Ce, 138Nd, 140Sm, 142Gd; calculated potential energy as a function of γ at a fixed β, ratio of energies and B(E2) values between 0+, 2+ and 4+ states, vibrational and potential energy components of the 0+ state. Five-dimensional quadrupole collective Hamiltonian method with the potential obtained in a constrained Hartree-Fock-Bogoliubov approach with a Skyrme energy-density functional and the collective mass functions obtained by the cranking approximation. Comparison to available experimental data.

doi: 10.1103/PhysRevC.108.014323
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2021WA03      Phys.Rev. C 103, 014306 (2021)

K.Washiyama, N.Hinohara, T.Nakatsukasa

Finite-amplitude method for collective inertia in spontaneous fission

RADIOACTIVITY 240Pu, 256Fm(SF); calculated collective inertia for fission dynamics, potential energy and pairing gaps for neutrons and protons as a function of quadrupole moment using the local quasiparticle random-phase approximation (LQRPA) with fission path obtained from constrained Hartree-Fock-Bogoliubov method with Skyrme energy density functional (EDF), and the finite-amplitude method (FAM) with a contour integration technique. Relevance to fission dynamics in heavy and superheavy nuclei to microscopically describe large-amplitude nuclear collective motion.

doi: 10.1103/PhysRevC.103.014306
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2020MA07      J.Radioanal.Nucl.Chem. 323, 921 (2020)

E.Maeda, A.Yokoyama, T.Taniguchi, K.Washiyama, I.Nishinaka

Measurements of the excitation functions of radon and astatine isotopes from 7Li-induced reactions with 209Bi for development of a 211Rn-211At generator

NUCLEAR REACTIONS 209Bi(7Li, 5n), (7Li, 6n), (7Li, 5np), E<60 MeV; measured reaction products, Eγ, Iγ; deduced σ. Comparison with available data.

doi: 10.1007/s10967-019-06990-z
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2726.

2017HI05      Phys.Rev. C 96, 014307 (2017)

Y.Hirayama, M.Mukai, Y.X.Watanabe, M.Ahmed, S.C.Jeong, H.S.Jung, Y.Kakiguchi, S.Kanaya, S.Kimura, J.Y.Moon, T.Nakatsukasa, M.Oyaizu, J.H.Park, P.Schury, A.Taniguchi, M.Wada, K.Washiyama, H.Watanabe, H.Miyatake

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N ≈ 126 isotope 199Pt

NUCLEAR MOMENTS 199Pt, 199mPt; measured magnetic dipole and electric quadrupole moments, isotope shifts, mean-square charge radii by hyperfine splitting of the 48.792-nm transition using the in-gas-cell laser ionization spectroscopy (IGLIS), and the half-lives of the ground state and the isomer; discussed configurations. 192,196,198Pt; measured mean-square charge radii relative to that of 194Pt by hyperfine structure. Pt isotopes produced in 198Pt(136Xe, X), E=10.75 MeV/nucleon reaction using the on-line KEK Isotope Separation System (KISS) at RIKEN. Comparison with previous experimental results, and with self-consistent Bogoliubov (HFB) model calculations. Systematics of magnetic dipole moments of 5/2- and 13/2+ states in 193,195,197,199Pt and 197,199Hg. Systematics of mean square charge radius and quadrupole deformation in A=178-199 Pt isotopes.

doi: 10.1103/PhysRevC.96.014307
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Data from this article have been entered in the XUNDL database. For more information, click here.

2017WA39      Phys.Rev. C 96, 041304 (2017)

K.Washiyama, T.Nakatsukasa

Multipole modes of excitation in triaxially deformed superfluid nuclei

NUCLEAR STRUCTURE 24Mg, 92,94Zr, 110Ru, 190Pt; calculated isoscalar quadrupole strengths, EWSR values for 110Ru. 100Zr; calculated isoscalar (IS) and isovector (IV) monopole strengths. Fully microscopic and nonempirical construction of five-dimensional quadrupole collective Hamiltonian with a 3D FAM-QRPA code for triaxial deformed nuclei with superfluidity.

doi: 10.1103/PhysRevC.96.041304
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2015NI08      J.Radioanal.Nucl.Chem. 304, 1077 (2015)

I.Nishinaka, A.Yokoyama, K.Washiyama, E.Maeda, S.Watanabe, K.Hashimoto, N.S.Ishioka, H.Makii, A.Toyoshima, N.Yamada, R.Amano

Production and separation of astatine isotopes in the 7Li + natPb reaction

NUCLEAR REACTIONS Pb(7Li, X)207At/208At/209At/210At/211At, E=29-57 MeV; measured reaction products, Eα, Iα, Eγ, Iγ; deduced production σ. Comparison with the predictions of the statistical calculation using the modified HIVAP code.

doi: 10.1007/s10967-015-3975-y
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2481.

2015WA17      Phys.Rev. C 91, 064607 (2015)


Microscopic analysis of fusion hindrance in heavy nuclear systems

NUCLEAR REACTIONS 90Zr(124Sn, X), E(cm)=233.5, 234, 234.5, 236, 240, 270 MeV; 40Ca(40Ca, X), E(cm)=55, 60, 90 MeV; 96Zr(124Sn, X), E(cm)=220, 228, 250, 300 MeV; 100Mo(104Ru, X), E(cm)=214, 250 MeV; 100Mo(110Pd, X), E(cm)=224, 250 MeV; 96Zr(132Sn, X), E(cm)=226.5, 250 MeV; 96Zr(136Xe, X), E(cm)=247, 300 MeV; 70Zn(208Pb, X), E(cm)=280, 300, 350 MeV; calculated mass quadrupole moment, density profiles, extra-push energies for heavy-ion systems and compared with experimental data, nucleus-nucleus potentials. Comparison between the nucleus-nucleus potential obtained from dissipative-dynamics time-dependent Hartree-Fock (DD-TDHF) and density-constrained DC-TDHF methods.

doi: 10.1103/PhysRevC.91.064607
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2012SC05      Phys.Rev. C 85, 034328 (2012)

G.Scamps, D.Lacroix, G.F.Bertsch, K.Washiyama

Pairing dynamics in particle transport

doi: 10.1103/PhysRevC.85.034328
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2012WA32      Phys.Rev. C 86, 054309 (2012)

K.Washiyama, K.Bennaceur, B.Avez, M.Bender, P.-H.Heenen, V.Hellemans

New parametrization of Skyrme's interaction for regularized multireference energy density functional calculations

NUCLEAR STRUCTURE 40,48Ca, 56Ni, 100,132Sn, 208Pb; calculated binding energy, charge radii. 24Mg, 74Kr, 80,100Zr, 186Pb; calculated potential energy curves versus β2. 240Pu; calculated fission barrier versus β2. 194Hg; calculated dynamical moment of inertia of superdeformed band. 249Bk, 251Cf; calculated one-quasiparticle levels. Z=20, A=36-52; Z=28, A=54-72; Z=50, A=100-134; Z=82, A=180-214; N=20, Z=10-22; N=50, Z=30-50; N=82, Z=48-70; N=126, Z=80-92; calculated binding energies, charge radii for even-even nuclei. Energy density functional calculations for spherical and deformed nuclei with new Skyrme parametrization with integer powers of the density. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.054309
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2011YI02      Phys.Rev. C 83, 064615 (2011)

B.Yilmaz, S.Ayik, D.Lacroix, K.Washiyama

Nucleon exchange mechanism in heavy-ion collisions at near-barrier energies

NUCLEAR REACTIONS 90Zr(40Ca, X), E(cm)=97 MeV; calculated nucleon density profiles, number of nucleon transfer to the target, nucleon drift coefficients, nucleon diffusion coefficients, fragment mass distributions in frameworks of the standard mean-field provided by the TDHF equations and the stochastic mean-field (SMF) approaches.

doi: 10.1103/PhysRevC.83.064615
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2009AY01      Phys.Rev. C 79, 054606 (2009)

S.Ayik, K.Washiyama, D.Lacroix

Fluctuation and dissipation dynamics in fusion reactions from a stochastic mean-field approach

NUCLEAR REACTIONS 40Ca(40Ca, X), E(cm)=100 MeV; calculated density profiles, neck radius, reduced friction coefficient and diffusion coefficient. Stochastic mean-field (SMF) approach using Dissipative-dynamics time-dependent Hartree-Fock method (DD-TDHF).

doi: 10.1103/PhysRevC.79.054606
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2009WA03      Phys.Rev. C 79, 024609 (2009)

K.Washiyama, D.Lacroix, S.Ayik

One-body energy dissipation in fusion reactions from mean-field theory

NUCLEAR REACTIONS 40Ca(40Ca, X), E=55-100 MeV; calculated barrier heights, reduced friction coefficients, number of nucleons transferred, total energy dissipation, occupancy factors for neutron single-particle states and internal excitation energy using DD-TDHF calculations. 40Ca, 48Ca, 208Pb(16O, X), $48Ca, 90Zr(40Ca, X), 48Ca(48Ca, X), E not given; calculated barrier heights and reduced friction coefficients for incident energies near or greater than Coulomb barrier.

doi: 10.1103/PhysRevC.79.024609
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2009WA16      Phys.Rev. C 80, 031602 (2009)

K.Washiyama, S.Ayik, D.Lacroix

Mass dispersion in transfer reactions with a stochastic mean-field theory

NUCLEAR REACTIONS 40Ca(40Ca, X), E(cm)=51, 52.5, 53 MeV; 56Ni(56Ni, X), E(cm)=98, 99.5, 100 MeV; 90Zr(90Zr, X), E(cm)=178, 179, 180 MeV; calculated diffusion coefficients and fragment mass variances in heavy-ion collisions using stochastic mean-field calculations.

doi: 10.1103/PhysRevC.80.031602
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2009WA19      Int.J.Mod.Phys. E18, 2114 (2009)

K.Washiyama, D.Lacroix

Energy dissipation in fusion reactions from dynamical mean-field theory

NUCLEAR REACTIONS 40Ca(40Ca, X), 16O(16O, X), E(cm)=55-100 MeV; calculated nucleus-nucleus potential, one-body energy dissipation.

doi: 10.1142/S0218301309014391
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2008WA17      Phys.Rev. C 78, 024610 (2008)

K.Washiyama, D.Lacroix

Energy dependence of the nucleus-nucleus potential close to the Coulomb barrier

NUCLEAR REACTIONS 16O, 40,48Ca, 208Pb(16O, X), E(cm)=23.5, 34, 76, 120, 140, 250 MeV; 40,48Ca, 90Zr(40Ca, X), E(cm)=53.5, 55, 57, 90, 100 MeV; 48Ca(48Ca, X), E not given; calculated nucleus-nucleus interaction potentials, density profiles, energy of Coulomb barrier. Macroscopic time-dependent Hartree-Fock theory. Comparison with experimental data.

doi: 10.1103/PhysRevC.78.024610
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2006WA09      Phys.Rev. C 73, 034607 (2006)

K.Washiyama, K.Hagino, M.Dasgupta

Probing surface diffuseness of nucleus-nucleus potential with quasielastic scattering at deep sub-barrier energies

NUCLEAR REACTIONS 197Au, 208Pb(32S, X), (34S, X), E(cm) ≈ 116-140 MeV; 154Sm, 186W, 208Pb(16O, X), E(cm) ≈ 35-72 MeV; 208Pb(32S, X), E(cm) ≈ 120-140 MeV; analyzed large-angle quasielastic σ(θ); deduced diffuseness parameters, target deformation dependence.

doi: 10.1103/PhysRevC.73.034607
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2004MB13      Nucl.Instrum.Methods Phys.Res. B 223-224, 807 (2004)

H.Matsumura, T.Aze, Y.Oura, H.Kikunaga, A.Yokoyama, K.Takamiya, S.Shibata, T.Otsuki, H.Yuki, K.Sakamoto, H.Haba, K.Washiyama, H.Nagai, H.Matsuzaki

Yield measurements for 7Be and 10Be productions from natCu, natAg and 197Au by bremsstrahlung irradiation at E0=200 MeV

NUCLEAR REACTIONS Cu(γ, x), Ag(γ, x), 197Au(γ, x), E=200 MeV; measured products, 7Be, 10Be; deduced σ, σ(E). Data were imported from EXFOR entry K2024.

doi: 10.1016/j.nimb.2004.04.149
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2024.

2004TA14      Phys.Rev. C 69, 054605 (2004)

N.Takigawa, S.Ayik, K.Washiyama, S.Kimura

Quantum effect in the diffusion along a potential barrier: Comments on the synthesis of superheavy elements

doi: 10.1103/PhysRevC.69.054605
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2004TA29      Prog.Theor.Phys.(Kyoto), Suppl. 154, 192 (2004)

N.Takigawa, T.Rumin, T.Masamoto, T.Takehi, K.Washiyama, S.Ayik

Recent Theoretical Activities of Heavy-Ion Fusion Reactions in Sendai

doi: 10.1143/PTPS.154.192
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2003HA18      Czech.J.Phys. (Supplement) 53, A265 (2003)

H.Haba, K.Sakamoto, M.Igarashi, M.Kasaoka, K.Washiyama, H.Matsumura, Y.Oura, S.Shibata, M.Furukawa, I.Fujiwara

Photofission of 197Au and 209Bi at intermediate energies

NUCLEAR REACTIONS 197Au, 209Bi(γ, F), E=300-1100 MeV bremsstrahlung; measured fission fragment mass distributions, kinetic energies. Thick-target thick-catcher method. Comparison with previous results.

doi: 10.1007/s10582-003-0034-7
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2002HA42      Radiochim.Acta 90, 371 (2002)

H.Haba, M.Kasaoka, M.Igarashi, K.Washiyama, H.Matsumura, Y.Oura, S.Shibata, K.Sakamoto, M.Furukawa, I.Fujiwara

Photofission of 209Bi at intermediate energies

NUCLEAR REACTIONS 209Bi(γ, F), E=450-1100 MeV bremsstrahlung; measured fission fragment charge and mass yield distributions. Comparison with model predictions.

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2022.

2000HA66      J.Nucl.Radiochem.Sci. 1, No 2, 53 (2000)

H.Haba, M.Igarashi, K.Washiyama, H.Matsumura, M.Yamashita, K.Sakamoto, Y.Oura, S.Shibata, M.Furukawa, I.Fujiwara

Photofission of 197Au at Intermediate Energies

NUCLEAR REACTIONS 197Au(γ, F), E=300-1100 MeV bremsstrahlung; measured fission fragments isotopic yields, mass distribution.

2000HA67      J.Nucl.Radiochem.Sci. 1, No 2, 69 (2000)

H.Haba, M.Igarashi, K.Washiyama, H.Matsumura, M.Yamashita, K.Sakamoto, Y.Oura, S.Shibata, M.Furukawa, I.Fujiwara

Recoil Properties of Radionuclides Formed in Photonuclear Reactions on 197Au at Intermediate Energies

NUCLEAR REACTIONS 197Au(γ, F), E=300-1100 MeV bremsstrahlung; measured fission fragments mean recoil ranges, related features.

2000MA75      Radiochim.Acta 88, 313 (2000)

H.Matsumura, K.Washiyama, H.Haba, Y.Miyamoto, Y.Oura, K.Sakamoto, S.Shibata, M.Furukawa, I.Fujiwara, H.Nagai, T.Kobayashi, K.Kobayashi

Target-Dependence of Light Fragment Production in Photonuclear Reactions at Intermediate Energies

NUCLEAR REACTIONS B, C, 23Na(γ, X)7Be, E < 1200 MeV bremsstrahlung; O, 141Pr(γ, X)7Be/10Be, E < 1200 MeV bremsstrahlung; 27Al(γ, X)7Be/22Na, E < 1200 MeV bremsstrahlung; Si, Cl(γ, X)7Be/22Na/24Na/28Mg, E < 1200 MeV bremsstrahlung; Ca, V, 55Mn(γ, X)22Na/24Na/28Mg, E < 1200 MeV bremsstrahlung; K(γ, X)24Na/28Mg, E < 1200 MeV bremsstrahlung; S, Fe, 59Co, Cu, 89Y, Ag, In, 159Tb, 165Ho, 197Au(γ, X)7Be/10Be/22Na/24Na/28Mg, E < 1200 MeV bremsstrahlung; Cu(γ, X)43Sc/44Sc/59Fe, E < 1200 MeV bremsstrahlung; 89Y, Ag, 165Ho, 197Au(γ, X)59Fe/56Co/57Co/58Co/60Co, E < 1200 MeV bremsstrahlung; Cu, In, 89Y, Ag, 165Ho, 197Au(γ, X)39Cl/44mSc/46Sc/47Sc/48Sc, E < 1200 MeV bremsstrahlung; 159Tb(γ, X)59Fe, E < 1200 MeV bremsstrahlung; measured yields; deduced mass-dependent features. Activation technique.

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2023.

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