Current status of the "Hybrid Kurotama model" for total reaction cross sections

Sihver, L.*; Kohama, Akihisa*; Iida, Kei*; Oyamatsu, Kazuhiro*; Hashimoto, Shintaro; Iwase, Hiroshi*; Niita, Koji*

Nuclear Instruments and Methods in Physics Research B, 334, p.34 - 39, 2014/09

https://doi.org/10.1016/j.nimb.2014.04.021

Accurate calculations of the nucleon + nucleus and nucleus + nucleus total reaction cross sections are of great importance for designing accelerator facilities and estimating dose in particle therapy with particle and heavy ion transport calculations, because the probability of nuclear reactions in the calculations depends on the cross sections. The Kurotama model assumes a target nucleus to be Black Sphere (BS), and gives the total reaction cross sections systematically using its radius determined from proton-nucleus elastic scattering data. However, the BS model breaks down below around 100 MeV/u. In this study, we developed the "hybrid Kurotama" model by connecting the BS model to the semi-empirical model of Tripathi et al. at low energies. The model has been tested against available p + He, p + nucleus, and nucleus + nucleus data and an overall better agreement has been found than for earlier published models. This model is suitable to be used in particle transport calculations.

Nuclear liquid drop model revisited

Oyamatsu, Kazuhiro*; Iida, Kei*; Koura, Hiroyuki

Aichi Shukutoku Daigaku Gendai Shakai Kenkyuka Kenkyu Hokoku, (3), p.1 - 10, 2008/06

http://www2.aasa.ac.jp/graduate/gsscs/reports01/PDF/03-001.pdf

Liquid drop model is a representative model to describe binding energy and size of nuclei. This model is conventional and well reproduces bulk properties of nuclei even in current studies on nuclei. Nowadays structure of neutron-rich nuclei is paid attention to not only in nuclear physics but also in astrophysics because these nuclei play a quite important role to solve a problem of origin of elements in universe. In this paper, we investigate nuclear symmetry energy and nuclear surface energy by using the nuclear liquid drop model with some higher-order terms. The coefficients of these term are determined so as to reproduce measured nuclear masses of approximately 2200 nuclides. From this analysis, we find an indication that the fourth-order term of the symmetry energy is required and the curvature term of it is negligible. Regarding a mass-number dependency on nuclear radius, we also find that the dependency of lighter nuclei (typically with mass number, A, less than 50) is larger than that of heavier nuclei.

JENDL FP decay data file 2000

Katakura, Junichi; Yoshida, Tadashi*; Oyamatsu, Kazuhiro*; Tachibana, Takahiro*

JAERI 1343, 79 Pages, 2001/07

JAERI-1343.pdf:4.94MB

no abstracts in English

Vacuum discharge as a possible source of -ray bursts

Mao, G.; Chiba, Satoshi; Greiner, W.*; Oyamatsu, Kazuhiro*

International Journal of Modern Physics E, 9(2), p.185 - 192, 2000/04

https://doi.org/10.1142/S0218301300000118

no abstracts in English

Nuclear matter structure studied with quantum molecular dynamics

Maruyama, Toshiki; Niita, Koji*; Oyamatsu, Kazuhiro*; Maruyama, Tomoyuki*; Chiba, Satoshi; Iwamoto, Akira

Nuclear Physics A, 654(3-4), p.908C - 911C, 1999/00

no abstracts in English

Int. Conf. on Nuclear Data for Science and Technology

Shibata, Keiichi; Fukahori, Tokio; Takano, Hideki; *; Watanabe, Yukinobu*; Kobayashi, Katsuhei*; *; Oyamatsu, Kazuhiro*

Nihon Genshiryoku Gakkai-Shi, 39(10), p.863 - 865, 1997/00

no abstracts in English

Masses of unstable nuclei and the equation of state of asymmetric nuclear matter, 2

Oyamatsu, Kazuhiro*; Iida, Kei*; Koura, Hiroyuki

no journal, , 

no abstracts in English

Nuclear liquid drop model revisited

Oyamatsu, Kazuhiro*; Iida, Kei*; Koura, Hiroyuki

no journal, , 

Liquid drop model is a representative model to describe binding energy and size of nuclei. This model is well reproduces bulk properties of nuclei even in current studies on nuclei. In this presentation, we investigate nuclear symmetry energy and nuclear surface energy by using the nuclear liquid drop model with some higher-order terms. The coefficients of these term are determined so as to reproduce measured nuclear masses of approximately 2200 nuclides. From this analysis we find an indication that the fourth-order terms of the symmetry energy is required and the curvature term of it is negligible. Regarding a mass-number dependency on nuclear radius, we also find that the dependency of lighter nuclei (typically with mass number, ) is larger than that of heavier nuclei.