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NSR database version of April 11, 2024.

Search: Author = K.Sekizawa

Found 19 matches.

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2023BI02      Eur.Phys.J. A 59, 60 (2023)

R.Biswas, S.Nath, J.Gehlot, Gonika, C.Kumar, A.Parihari, N.Madhavan, A.Vinayak, A.Mahato, S.Noor, P.Sherpa, K.Sekizawa

Determination of 1p- and 2p-stripping excitation functions for 16O+142Ce using a recoil mass spectrometer

NUCLEAR REACTIONS 142Ce(16O, 15N), (16O, 14C), E=57-69 MeV; measured reaction products, TOF; deduced σ(θ). Comparison with finite-range CRC model calculations performed using the code fresco. 15UD Pelletron accelerator at IUAC, New Delhi.

doi: 10.1140/epja/s10050-023-00975-z
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2022MA28      Phys.Rev. C 105, 064602 (2022)

P.Magierski, A.Makowski, M.C.Barton, K.Sekizawa, G.Wlazlowski

Pairing dynamics and solitonic excitations in collisions of medium-mass, identical nuclei

NUCLEAR REACTIONS 90Zr(90Zr, X), 96Zr(96Zr, X), E(cm)=180-200 MeV; calculated time evolution of neutron average pairing gap and the quadrupole moment in head-on collision of superfluid nuclei. Time-dependent density functional theory (TDDFT) extended to superfluid systems, known as the time-dependent superfluid local density approximation (TDSLDA).

doi: 10.1103/PhysRevC.105.064602
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2022RO09      Phys.Rev. C 105, 044611 (2022)

B.J.Roy, S.Santra, A.Pal, H.Kumawat, S.K.Pandit, V.V.Parkar, K.Ramachandran, K.Mahata, K.Sekizawa

Reaction mechanism study for multinucleon transfer processes in collisions of spherical and deformed nuclei at energies near and above the Coulomb barrier: The 16O + 154Sm reaction

NUCLEAR REACTIONS 154Sm(16O, X)6Li/7Li/10B/11B/12C/13C/13N/14N/15N/9Be/16O/17O/18O, E=85, 134 MeV; measured reaction products, projectile-like fragments, angular distributions; deduced σ(θ), σ(E), Q, total kinetic energy loss (TKEL) by fragments, optical potential parameters. Studied the orientation effect in multinucleon transfer processes. Compared with theoretical calculations based on time-dependent Hartree-Fock (TDHF)combined with a statistical model, GEMINI++.BARC-TIFR Pelletron-Linac facility.

doi: 10.1103/PhysRevC.105.044611
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2022SE04      Phys.Rev. C 105, 045807 (2022)

K.Sekizawa, S.Kobayashi, M.Matsuo

Time-dependent extension of the self-consistent band theory for neutron star matter: Anti-entrainment effects in the slab phase

doi: 10.1103/PhysRevC.105.045807
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2020AY07      Phys.Rev. C 102, 064619 (2020)

S.Ayik, K.Sekizawa

Kinetic-energy dissipation and fluctuations in strongly damped heavy-ion collisions within the stochastic mean-field approach

NUCLEAR REACTIONS 208Pb(136Xe, X), E(cm)=526 MeV; calculated diffusion and friction coefficients for radial linear momentum, total kinetic energy (TKE), and total kinetic energy loss (TKEL) distributions using time-dependent Hartree-Fock (TDHF) and stochastic mean-field (SMF) theories; deduced strongly damped collisions at around the Coulomb barrier.

doi: 10.1103/PhysRevC.102.064619
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2020BA14      Acta Phys.Pol. B51, 605 (2020)

M.C.Barton, S.Jin, P.Magierski, K.Sekizawa, G.Wlazlowski, A.Bulgac

Pairing Dynamics in Low-Energy Nuclear Collisions

doi: 10.5506/APhysPolB.51.605
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2020SE12      Phys.Rev. C 102, 014620 (2020)

K.Sekizawa, S.Ayik

Quantal diffusion approach for multinucleon transfer processes in the 58, 64Ni + 208Pb reactions: Toward the production of unknown neutron-rich nuclei

NUCLEAR REACTIONS 208Pb(58Ni, X), E(cm)=270 MeV; 208Pb(64Ni, X), E(cm)=268 MeV; calculated average mass and charge of reaction products, total kinetic energy loss (TKEL), contact time, diffusion coefficients and covariances for neutron and proton transfers, and production σ for primary and secondary products using three-dimensional time-dependent Hartree-Fock (TDHF) with Skyrme SLy4d functional, and stochastic mean field (SMF) approaches, supplemented with statistical model GEMINI++.

doi: 10.1103/PhysRevC.102.014620
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2019SE08      Phys.Rev. C 99, 051602 (2019)

K.Sekizawa, K.Hagino

Time-dependent Hartree-Fock plus Langevin approach for hot fusion reactions to synthesize the Z = 120 superheavy element

NUCLEAR REACTIONS 254Fm(48Ca, X)302120*, E(cm)=212.8, 255.4 MeV; 248Cm(54Cr, X)302120*, E(cm)=243.2, 291.8 MeV; 249Bk(51V, X)300120*, E(cm)=237.0, 284.4 MeV; 257Fm(48Ca, X)305120*, E(cm)=212.4, 254.9 MeV; calculated distance of closest approaches, and dissipated energies using time-dependent Hartree-Fock (TDHF) method with Skyrme interactions; calculated evaporation residue formation probabilities using Langevin with statistical (fusion by diffusion) models.

doi: 10.1103/PhysRevC.99.051602
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2018MA44      Acta Phys.Pol. B49, 281 (2018)

P.Magierski, J.Grineviciute, K.Sekizawa

Pairing Dynamics and Time-dependent Density Functional Theory

doi: 10.5506/aphyspolb.49.281
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2018RO04      Phys.Rev. C 97, 034603 (2018)

B.J.Roy, Y.Sawant, P.Patwari, S.Santra, A.Pal, A.Kundu, D.Chattopadhyay, V.Jha, S.K.Pandit, V.V.Parkar, K.Ramachandran, K.Mahata, B.K.Nayak, A.Saxena, S.Kailas, T.N.Nag, R.N.Sahoo, P.P.Singh, K.Sekizawa

Deep-inelastic multinucleon transfer processes in the 16O + 27Al reaction

NUCLEAR REACTIONS 27Al(16O, 16O), (16O, 6Li), (16O, 7Li), (16O, 7Be), (16O, 9Be), (16O, 10B), (16O, 11B), (16O, 12C), (16O, 13C), (16O, 14N), (16O, 15N), E=134 MeV; measured reaction products, σ(θ) for elastic-scattering and for various transfer channels, total kinetic energy loss spectra at the TIFR Pelletron-LINAC accelerator facility, Mumbai; deduced Q value, and angle-integrated production cross sections for various proton-transfer channels. Comparison with calculated production cross sections using time-dependent Hartree-Fock (TDHF) theory and recently developed method TDHF+GEMINI, and secondary deexcitation processes using a statistical model GEMINI++. Discussed possible interplay between fusion-fission, deep-inelastic, multinucleon transfer, and particle evaporation processes.

doi: 10.1103/PhysRevC.97.034603
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD6338.

2018WI01      Phys.Rev.Lett. 120, 022501 (2018)

E.Williams, K.Sekizawa, D.J.Hinde, C.Simenel, M.Dasgupta, I.P.Carter, K.J.Cook, D.Y.Jeung, S.D.McNeil, C.S.Palshetkar, D.C.Rafferty, K.Ramachandran, A.Wakhle

Exploring Zeptosecond Quantum Equilibration Dynamics: From Deep-Inelastic to Fusion-Fission Outcomes in 58Ni + 60Ni Reactions

NUCLEAR REACTIONS 58,60Ni(58Ni, X), E=158.4 MeV; measured reaction products; deduced σ, σ(θ, E). Comparison with theoretical predictions using time dependent Hartree-Fock and time dependent random phase approximation approaches, which, respectively, incorporate one-body energy dissipation and fluctuations.

doi: 10.1103/PhysRevLett.120.022501
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2017MA38      Phys.Rev.Lett. 119, 042501 (2017)

P.Magierski, K.Sekizawa, G.Wlazlowski

Novel Role of Superfluidity in Low-Energy Nuclear Reactions

NUCLEAR REACTIONS 240Pu(240Pu, X), 90Zr(90Zr, X), E>190 MeV; calculated total kinetic energy (TKE) of the outgoing fragments, fusion threshold energy.

doi: 10.1103/PhysRevLett.119.042501
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2017SE12      Phys.Rev. C 96, 014615 (2017)


Microscopic description of production cross sections including deexcitation effects

NUCLEAR REACTIONS 124Sn(40Ca, X), E(cm)=128.54 MeV; 124Sn(48Ca, X), E(cm)=125.44 MeV; 208Pb(40Ca, X), E(cm)=208.84 MeV; 208Pb(58Ni, X), E(cm)=256.79 MeV; 238U(64Ni, X), E(cm)=307.35 MeV; 198Pt(136Xe, X), E(cm)=644.98 MeV; calculated production σ for secondary products in low-energy heavy ion reactions. Time-dependent Hartree-Fock (TDHF) + GEMINI model. Comparison with available experimental data, and with GRAZING calculations. Relevance to quest for new neutron-rich isotopes.

doi: 10.1103/PhysRevC.96.014615
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2017SE17      Phys.Rev. C 96, 041601 (2017)


Enhanced nucleon transfer in tip collisions of238U + 124Sn

NUCLEAR REACTIONS 238U(124Sn, X), E(cm)=300-1200 MeV; calculated production cross sections for the lighter fragments, density contours in head-on collisions, dynamics of neck formation and breaking, particle transfers using microscopic framework of the time-dependent Hartree-Fock (TDHF) theory. Comparison with experimental cross section data. Relevance to production of new neutron-rich heavy and superheavy nuclei.

doi: 10.1103/PhysRevC.96.041601
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2016SE07      Phys.Rev. C 93, 054616 (2016)

K.Sekizawa, K.Yabana

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in the 64Ni + 238U reaction

NUCLEAR REACTIONS 238U(64Ni, X), E(cm)=277-495 MeV; calculated multinucleon transfer (MNT) and quasifission (QF) dynamics for three orientations of 238U, scattering angles, total kinetic energy (TKE), contact time, mass and charge of reaction products, density contours, production cross sections in proton-transfers channels (up to six protons), Mass-angle distribution (MAD) plots. Three-dimensional time-dependent Hartree-Fock (TDHF) calculations with Skyrme SLy5 energy density functional (EDF) for various initial conditions. Comparison with available experimental data.

doi: 10.1103/PhysRevC.93.054616
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2016WL01      Phys.Rev.Lett. 117, 232701 (2016)

G.Wlazlowski, K.Sekizawa, P.Magierski, A.Bulgac, M.McNeil Forbes

Vortex Pinning and Dynamics in the Neutron Star Crust

doi: 10.1103/PhysRevLett.117.232701
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2015SO17      Phys.Rev. C 92, 024603 (2015)

Sonika, B.J.Roy, A.Parmar, U.K.Pal, H.Kumawat, V.Jha, S.K.Pandit, V.V.Parkar, K.Ramachandran, K.Mahata, A.Pal, S.Santra, A.K.Mohanty, K.Sekizawa

Multinucleon transfer study in 206Pb(18O, x) at energies above the Coulomb barrier

NUCLEAR REACTIONS 206Pb(18O, 20O), (18O, 19O), (18O, 17O), (18O, 16O), (18O, 18N), (18O, 17N), (18O, 16N), (18O, 15N), (18O, 14N), (18O, 16C), (18O, 15C), (18O, 14C), (18O, 13C), (18O, 12C), (18O, 12B), (18O, 11B), (18O, 10B), (18O, 10Be), (18O, 9Be), (18O, 18O)E=139 MeV; measured particle spectra, elastic σ(θ), total kinetic energy loss (TKEL) spectra, angular distributions at Pelletron-LINAC accelerator of BARC-TIFR facility; deduced Q values and angle integrated cross sections. Comparison with fully microscopic time-dependent Hartree-Fock (TDHF) calculations, based on the independent single-nucleon transfer mode. Discussed effect of particle evaporation on the production cross sections, and possible origin of discrepancies.

doi: 10.1103/PhysRevC.92.024603
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD6264.

2014SE23      Phys.Rev. C 90, 064614 (2014)

K.Sekizawa, K.Yabana

Particle-number projection method in time-dependent Hartree-Fock theory: Properties of reaction products

NUCLEAR REACTIONS 16O(24O, X)14C/15N/16O/17O/18O/25F/22O/23O/24O/26Ne, E=2, 4, 8 MeV/nucleon; calculated deflection angle, TKEL, transfer probabilities with respect to target-like fragments (TLF) and projectile-like fragments (PLF), expectation values of the angular momentum operator for fragment nuclei as function of the distance of closest approach, average excitation energies of fragment nuclei. Time-dependent Hartree-Fock (TDHF) theory in three-dimensional Cartesian grid representation combined with particle-number projection method for one- and two-nucleon removal reactions.

doi: 10.1103/PhysRevC.90.064614
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2013SE10      Phys.Rev. C 88, 014614 (2013); Erratum Phys.Rev. C 93, 029902 (2016)

K.Sekizawa, K.Yabana

Time-dependent Hartree-Fock calculations for multinucleon transfer processes in 40, 48Ca+124Sn, 40Ca+208Pb, and 58Ni+208Pb reactions

NUCLEAR REACTIONS 124Sn(40Ca, X), (48Ca, X), E=170, 174 MeV; 208Pb(40Ca, X), E=235, 249 MeV; 208Pb(58Ni, X), E=328.4 MeV; calculated total energy loss (TKEL), σ and σ(θ) for transfer channels, average number of nucleons transferred and transfer probabilities, N/Z ratios for multinucleon transfer reactions. Time-dependent Hartree-Fock (TDHF) calculations. Comparison with experimental data, and with other calculations.

doi: 10.1103/PhysRevC.88.014614
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