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Ogawa, Tatsuhiko; Sato, Tatsuhiko; Hashimoto, Shintaro; Niita, Koji*
EPJ Web of Conferences, 117, p.03011_1 - 03011_8, 2016/05
Times Cited Count：1 Percentile：65.9(Nuclear Science & Technology)Accurate prediction of fragment angular distribution in nucleus-nucleus collisions is essential for theoretical studies on nuclei and applications of particle beam. Quantum molecular dynamics is one of the approaches often adopted in general purpose radiation transport simulation codes to simulate formation of fragments, however, it is suggested that they tend to overestimate the width of fragment distribution angle. It is true for JQMD, the nucleus-nucleus reaction event generator incorporated to PHITS. By revising the description of peripheral collisions prediction of fragments angular distribution has been improved. First, spurious disintegration of nuclei before interaction is inhibited by introducing relativistic-covariant kinematics. By this improvement, one can distinguish nucleus spuriously disintegrated and nuclei interacted with other nuclei. Second, nucleon-nucleon scattering cross sections were increased by the suppression of Pauli blocking effect in the nucleus outer region to take into account for the increase in nucleon-nucleon scattering cross section. As a result, revised JQMD (RJQMD) predicts fragment angular distribution of fragments better than JQMD.
Hirose, Kentaro; Nishio, Katsuhisa; L
guillon, R.; Makii, Hiroyuki; Nishinaka, Ichiro; Orlandi, R.; Smallcombe, J.; Ishii, Tetsuro; Tsukada, Kazuaki; Asai, Masato; et al.
no journal, ,
Maruyama, Toshiki
no journal, ,
We have investigated the property and structure of high density nuclear matter in the neutron star interior. So far, we have shown by a relativistic mean field model that with the appearance of kaons, the equation of state of matter becomes soft, and that by a strong attraction between 
and 
, they make separate 
and 
phases, which form pasta structures. This time we have incorporated with hyperon degree of freedom. As a result, first 
begins to mix in matter, and then 
. But with the appearance of kaon, disappears and decreases. Therefore, repulsion between hyperons and kaon may be active. This tendency is also seen in the density profile of pasta structures, where hyperons and kaon keep away from each other.
