MASAHISA OHTA

Effects of neck and nuclear orientations on the mass drift in heavy ion collisions

Shota Amano, Y. Aritomo, MASAHISA OHTA

Background: We clarified that the fusion hindrance in heavy ion collisions is caused by the expansion of the neck bridge at the early stage of collision [Phys. Rev. C 108, 014612 (2023)]; however, our discussion was limited to the trajectory analysis. To …

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Analysis of reaction dynamics considering MAD by Langevin equation

Y. Aritomo, Shota Amano, MASAHISA OHTA

In heavy ion fusion and nucleon transfer reactions, which lead to the synthesis of superheavy elements, it is important to understand the reaction mechanisms. The fusion reaction mechanism is analyzed in the case of deformed target nuclei such as actinide target nuclei. …

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FENDL: A library for fusion research and applications

Georg Schnabel, Daniel L. Aldama, Tim D. Bohm, U. Fischer et autres

The Fusion Evaluated Nuclear Data Library (FENDL) is a comprehensive and validated collection of nuclear cross section data coordinated by the International Atomic Energy Agency (IAEA) Nuclear Data Section (NDS). FENDL assembles the best nuclear data for fusion applications selected from available …

Nuclear viscosity estimated by dynamics of neck formation in the early stage of nuclear collision

Shota Amano, Y. Aritomo, MASAHISA OHTA

The very early stage of the coalescence of two nuclei is studied and used to estimate the nuclear viscosity. The time evolution of the neck region has been simulated by the unified Langevin equation method, which is used in the analysis of …

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Dynamical mechanism of fusion hindrance in heavy ion collisions

Shota Amano, Y. Aritomo, MASAHISA OHTA

Background: In the fusion process, the investigation of the reaction dynamics in the time evolution of the nuclear configuration is necessary. The neck parameter $\ensuremath{\epsilon}$ which is one of the parameters representing the nuclear configuration in the two center shell model is …

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Modes of massive nucleon transfer appearing in quasifission processes for collisions of superheavy nuclei

Shota Amano, Y. Aritomo, MASAHISA OHTA

Background: It is challenging to distinguish between fusion-fission and quasifission experimentally. To determine the characteristics of quasifission processes associated with dominant phenomena in heavy-ion collisions is important for estimating precisely the fusion cross section, which is relevant to the synthesis of new …

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Fusion cross section and total kinetic energy of fission fragments by the dynamical dissipative surface-friction model

Shota Amano, Y. Aritomo, MASAHISA OHTA

The capture cross section, the fusion cross section, and the quasi-fission yield producing symmetric fragments ( ACN/2 ± 20u ) in the 48 Ca+ 238 U reaction are analyzed by the multidimensional Langevin equation taking account of the surface friction effect. From …

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Fission mechanism inferred from nuclear shape fluctuation by the Langevin equation

Y. Aritomo, Akira Iwamoto, K. Nishio, MASAHISA OHTA

One of the dynamical investigations foran understanding of the fission process is the analysis through Langevin trajectories in the nuclear deformation space. The main motivation of this analysis is to elucidate the characteristic nuclear-shape oscillation induced by a random force in the …

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R&D Activities for Fusion DEMO in the QST Rokkasho Fusion Institute

Yasutomo Ishii, N. Aiba, Masami Ando, N. Asakura et autres

The current status and the progress of research and development (R&D) activities for a Fusion DEMO reactor in the National Institutes for Quantum and Radiological Science and Technology (QST) Rokkasho Fusion Institute is reported. In order to advance the Japanese DEMO activity, …

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Conceptual design of advanced fusion neutron source (A-FNS) and irradiation test modules

Shôichi Sato, Atsushi Kasugai, K. Ochiai, Kai Masuda et autres

Conceptual design of advanced fusion neutron source (A-FNS) and irradiation test modules, Sato, S., Kasugai, A., Ochiai, K., Masuda, K., Nakamura, M.M., Ohta, M., Oyaidzu, M., Kwon, S., Sakamoto, K., Ishida, S.

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Estimation of Synthesizing New Superheavy Elements Using Dynamical Model

Y. Aritomo, Shota Amano, M. Okubayashi, Baku Yanagi et autres

Abstract For the success the synthesis of superheavy elements $$Z>118$$ , it is indispensable to clarify the fusion–fission mechanism, which includes a role of the nuclear structure of colliding nuclei and the deformation in the fusion process. We develop the dynamical model …

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Conceptual design progress of advanced fusion neutron source

K. Ochiai, Shôichi Sato, Hidehito Kondo, MASAHISA OHTA et autres

Abstract Based on the results of the IFMIF/EVEDA project in the broader approach (BA) activities, the conceptual design of the Advanced Fusion Neutron Source (A-FNS) to obtain irradiation data of DEMO blanket materials is under consideration in Japan. This paper describes the …

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