The r-process element abundance with a realistic fission fragment mass distribution

Chiba, Satoshi; Koura, Hiroyuki; Maruyama, Toshiki; Ota, Masahisa*; Tatsuda, Sayuki*; Wada, Takahiro*; Tachibana, Takahiro*; Sumiyoshi, Kosuke*; Otsuki, Kaori*; Kajino, Toshitaka*

AIP Conference Proceedings 1016, p.162 - 167, 2008/05

https://doi.org/10.1063/1.2943568

Effect of the -delayed fission in r-process abundance is investigated. The data base for the fission fragment mass distribution used in the r-process network calculation is constructed based on the 2-center shell model and Langevinequation. The -decay rates (no emissive, neutron emission and -delayed fission) are also newly calculated with the gross theory. The differences appeared in the final element abundance calculated with and without fission process are demonstrated and the mass region modified by the fission products is presented.

Fission fragment mass distribution for nuclei in the r-process region

Tatsuda, Sayuki*; Hashizume, Kazuaki*; Wada, Takahiro*; Ota, Masahisa*; Sumiyoshi, Kosuke*; Otsuki, Kaori*; Kajino, Toshitaka*; Koura, Hiroyuki; Chiba, Satoshi; Aritomo, Yoshihiro*

AIP Conference Proceedings 891, p.423 - 426, 2007/03

https://doi.org/10.1063/1.2713548

We investigate the fission-fragment mass distribution on about 2000 nuclides, which should have a critical impact on the r-process nucleosynthesis through fission (). The mass distribution of fission fragment is thought to be one of the most important elements on some astrophysical conditions for the theoretical estimation of the r-process abundance pattern. We calculated the potential energy surface (PES) by means of the liquid-drop model with the shell energy correction by the Two-Center shell model in 3-dimensional parameter space. We derive fission-fragment mass distribution by considering the location and the depth of the valley of PES near the saddle point and the scission point of nuclei with the use of the Langevin calculation. We determine the fission asymmetry by examining the valley depth and its location in the deformation parameter space. The consistency of our mass asymmetry with available experimental data is discussed.

Spontaneous variation in a rotating magnetosphere

Miyoshi, Takahiro; Kusano, Kanya*

Journal of Plasma and Fusion Research SERIES, Vol.4, p.536 - 539, 2001/00

no abstracts in English

A Spatial discretization of the MHD equations based on the finite volume - spectral method

Miyoshi, Takahiro; NEXT Group

JAERI-Research 2000-023, 17 Pages, 2000/05

JAERI-Research-2000-023.pdf:0.88MB

no abstracts in English

A Finite volume approach to the fully compressible MHD simulation of high tokamak plasmas

Kagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*

no journal, , 

no abstracts in English

Nonlinear MHD of high plasmas in which internal kink and ballooning instabilities coexist together

Kagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*

no journal, , 

no abstracts in English

Simulation of interactions between the pressure-driven high-n MHD mode and the internal kink mode

Kagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*

no journal, , 

no abstracts in English

Development of finite-volume-based full MHD code for internal and external MHD instabilities

Kagei, Yasuhiro; Kishimoto, Yasuaki; Miyoshi, Takahiro*; Takechi, Manabu

no journal, , 

no abstracts in English

Simulation of external MHD modes in a tokamak by a finite volume method code

Kagei, Yasuhiro; Tokuda, Shinji; Kishimoto, Yasuaki; Miyoshi, Takahiro*

no journal, , 

no abstracts in English

Simulation of external MHD modes in tokamak plasmas by a finite volume method code

Kagei, Yasuhiro; Tokuda, Shinji; Miyoshi, Takahiro*

no journal, , 

no abstracts in English