189 citations · 1.2k across the 36 of their papers we have counts for
28 papers · 1 filter
The Quest for Superheavy Nuclei: A Theoretical Perspective
C. Simenel, Lu Guo, K. Sekizawa
The synthesis of superheavy nuclei (SHNs) lies at the forefront of nuclear physics, enabling researchers to probe the limits of nuclear stability and the influence of shell effects…
Phase transitions in the inner crust of neutron stars within the superfluid band theory: Competition between pairing and spin polarization under finite temperature and magnetic field
Kenta Yoshimura, Kazuyuki Sekizawa
Phase transitions of matter under changes of external environment such as temperature and magnetic field have attracted great interests to various quantum many-body systems. Severa…
Time-Dependent Superfluid Band Theory for the Inner Crust of Neutron Stars: Current Status and Future Challenges
Kazuyuki Sekizawa, Kenta Yoshimura
In this contribution, current status and future prospects of our ongoing project is summarized. In the inner crust of neutron stars, a variety of crystalline structures may emerge,…
Superfluid extension of the self-consistent time-dependent band theory for neutron star matter: Anti-entrainment versus superfluid effects in the slab phase
Kenta Yoshimura, Kazuyuki Sekizawa
Background: The inner crust of neutron stars consists of a Coulomb lattice of neutron-rich nuclei, immersed in a sea of superfluid neutrons with background relativistic electron ga…
Manifestation of pairing modes in nuclear collisions
A. Makowski, M. C. Barton, P. Magierski +2
We discuss the possible manifestation of pairing dynamics in nuclear collisions beyond the standard quasi-static treatment of pairing correlations. These involve solitonic excitati…
Possible Existence of Extremely Neutron-Rich Superheavy Nuclei in Neutron Star Crusts Under a Superstrong Magnetic Field
Kazuyuki Sekizawa, Kentaro Kaba
We investigate outer crust compositions for a wide range of magnetic field strengths, up to G, employing the latest experimental nuclear masses supplemente…
Time-dependent extension of the self-consistent band theory for neutron star matter: Anti-entrainment effects in the slab phase
Kazuyuki Sekizawa, Sorataka Kobayashi, Masayuki Matsuo
Background: In the solid crust of neutron stars, a variety of crystalline structure may exist. Recently the band theory of solids has been applied to the inner crust of neutron sta…
Pairing dynamics and solitonic excitations in collisions of medium-mass, identical nuclei
Piotr Magierski, Andrzej Makowski, Matthew C. Barton +2
We present results of collisions of Zr+Zr and Zr+Zr obtained within time-dependent density functional theory (TDDFT) extended to superfluid systems, kno…
Kinetic energy dissipation and fluctuations in strongly-damped heavy-ion collisions within the stochastic mean-field approach
Sakir Ayik, Kazuyuki Sekizawa
Background: Microscopic mean-field approaches have been successful in describing the most probable reaction outcomes in low-energy heavy-ion reactions. However, those approaches ar…
TDHF and a macroscopic aspect of low-energy nuclear reactions
Kouhei Washiyama, Kazuyuki Sekizawa
Time-dependent Hartree--Fock (TDHF) method has been applied to various low-energy nuclear reactions, such as fusion, fission, and multinucleon transfer reactions. In this Mini Revi…
Quantal diffusion approach for multinucleon transfer processes in the Ni+Pb reactions: Toward the production of unknown neutron-rich nuclei
Kazuyuki Sekizawa, Sakir Ayik
Background: In recent years, substantial efforts have been made for the study of multinucleon transfer reactions at energies around the Coulomb barrier both experimentally and theo…
Pairing dynamics in low energy nuclear collisions
M. C. Barton, S. Jin, P. Magierski +3
Superfluidity is a generic feature of various quantum systems at low temperatures and it is in particular important for the description of dynamics of low energy nuclear reactions.…
Time-dependent Hartree-Fock plus Langevin approach for hot fusion reactions to synthesize the superheavy element
K. Sekizawa, K. Hagino
We develop a novel approach to fusion reactions for syntheses of superheavy elements, which combines the time-dependent Hartree-Fock (TDHF) method with a dynamical diffusion model…
TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: a Mini Review
Kazuyuki Sekizawa
Time-dependent Hartree-Fock (TDHF) theory has been a powerful tool in describing a variety of complex nuclear dynamics microscopically without empirical parameters. In this contrib…
Pairing dynamics and time dependent density functional theory
P. Magierski, J. Grineviciute, K. Sekizawa
We discuss issues related to pairing dynamics in nuclear large amplitude collective motion. The examples of effects which are not properly described within BCS theory are presented…
Enhanced nucleon transfer in tip collisions of U+Sn
Kazuyuki Sekizawa
Multinucleon transfer processes in low-energy heavy ion reactions have attracted increasing interest in recent years aiming at production of new neutron-rich isotopes. Clearly, it…
Solitonic excitations in collisions of superfluid nuclei: a qualitatively new phenomenon distinct from the Josephson effect
Kazuyuki Sekizawa, Gabriel Wlazłowski, Piotr Magierski
Recently, we have reported a novel role of pairing in low-energy heavy ion reactions at energies above the Coulomb barrier, which may have a detectable impact on reaction outcomes,…
Microscopic description of production cross sections including deexcitation effects
Kazuyuki Sekizawa
Background: At the forefront of the nuclear science, production of new neutron-rich isotopes is continuously pursued at accelerator laboratories all over the world. To explore the…
Solitonic Excitations in Collisions Of Superfluid Nuclei
Kazuyuki Sekizawa, Piotr Magierski, Gabriel Wlazłowski
We investigate the role of the pairing field dynamics in low-energy heavy ion reactions within the nuclear time-dependent density functional theory extended to superfluid systems.…
Novel Role of Superfluidity in Low-Energy Nuclear Reactions
Piotr Magierski, Kazuyuki Sekizawa, Gabriel Wlazłowski
We demonstrate, within symmetry unrestricted time-dependent density functional theory, the existence of new effects in low-energy nuclear reactions which originate from superfluidi…
Quasifission dynamics and stability of superheavy systems
Kazuyuki Sekizawa, Sophia Heinz
Recent experiments revealed intriguing similarities in the Ni+Pb, Xe+Pb, and U+U reactions at energies around the Coulomb barrier. Th…
Microscopic Calculations of Vortex-Nucleus Interaction in the Neutron Star Crust
Kazuyuki Sekizawa, Gabriel Wlazłowski, Piotr Magierski +2
We investigate the dynamics of a quantized vortex and a nuclear impurity immersed in a neutron superfluid within a fully microscopic time-dependent three-dimensional approach. The…
Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in the Ni+U reaction
Kazuyuki Sekizawa, Kazuhiro Yabana
Background: Multinucleon transfer (MNT) and quasifission (QF) processes are dominant processes in low-energy collisions of two heavy nuclei. They are expected to be useful to produ…
Multinucleon transfer reaction in time-dependent Hartree-Fock theory
Kazuyuki Sekizawa, Kazuhiro Yabana
Time-dependent Hartree-Fock (TDHF) theory has achieved a remarkable success in describing and understanding nuclear many-body dynamics from nucleons' degrees of freedom. We here re…