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Journal Articles

Comparison of heavy-ion transport simulations; Collision integral with pions and $$Delta$$ resonances in a box

Ono, Akira*; Xu, J.*; Colonna, M.*; Danielewicz, P.*; Ko, C. M.*; Tsang, M. B.*; Wang, Y,-J.*; Wolter, H.*; Zhang, Y.-X.*; Chen, L.-W.*; et al.

Physical Review C, 100(4), p.044617_1 - 044617_35, 2019/10

AA2019-0025.pdf:2.76MB

 Times Cited Count:52 Percentile:98.56(Physics, Nuclear)

International comparison of heavy-ion induced reaction models were discussed in the international conference "Transport2017" held in April 2017. Owing to their importance for safety assessment of heavy-ion accelerators and dosimetry of astronauts, various models to simulate heavy-ion induced reaction models are developed. This study is intended to clarify the difference among them to pinpoint their problems. In the comparison study, 320 protons and neutrons were packed in a 20-fm-large cube to calculate the number and energies of collisions during the time evolution. The author contributed to this study by running calculation using JQMD (JAERI Quantum Molecular Dynamics). This study showed that time step in the calculation is one of the biggest causes of the discrepancies. For example, the calculation by JQMD comprises 1-fm/c time steps, each of which is composed of transport, scattering and decay phases. Therefore a sequence of scattering, and decay followed by another scattering in 1 fm/c cannot be considered. Moreover, in JQMD particles are labeled by sequential numbers and scattering reactions are simulated by the order. Therefore scattering between low ID numbers, that between high ID numbers and that between the first (low ID) pair is overlooked in JQMD. Above indications obtained in this study must be kept in our mind for future JQMD upgrades.

Journal Articles

Comparison of heavy-ion transport simulations; Collision integral in a box

Zhang, Y.-X.*; Wang, Y,-J.*; Colonna, M.*; Danielewicz, P.*; Ono, Akira*; Tsang, M. B.*; Wolter, H.*; Xu, J.*; Chen, L.-W.*; Cozma, D.*; et al.

Physical Review C, 97(3), p.034625_1 - 034625_20, 2018/03

 Times Cited Count:90 Percentile:99.11(Physics, Nuclear)

International comparison of heavy-ion induced reaction models were discussed in the international conference "Transport2017" held in April 2017. Owing to their importance for safety assessment of heavy-ion accelerators and dosimetry of astronauts, various models to simulate heavy-ion induced reaction models are developed. This study is intended to clarify the difference among them to pinpoint their problems. In the comparison study, 320 protons and 320 neutrons were packed in a 20-fm-large cube to calculate the number of particle-particle collisions as well as the energies of collisions during the time evolution. In addition to the calculation, their algorithms were compared. The author contributed to this study by running calculation using JQMD (JAERI Quantum Molecular Dynamics). The results were compared with those calculated by the other 15 codes from over the world. Algorithm comparison showed that JQMD calculates collision probabilities from protons at first and collisions by neutrons are simulated later, which might be unreasonable. On the other hand, it was clarified that the calculation by JQMD agrees with those by the others. Despite the fact that some codes deviate from the average by a factor of 2, JQMD exhibited stable performance.

Journal Articles

Studies of high density baryon matter with high intensity heavy-ion beams at J-PARC

Sako, Hiroyuki; Harada, Hiroyuki; Sakaguchi, Takao*; Chujo, Tatsuya*; Esumi, Shinichi*; Gunji, Taku*; Hasegawa, Shoichi; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; et al.

Nuclear Physics A, 956, p.850 - 853, 2016/12

 Times Cited Count:12 Percentile:65.93(Physics, Nuclear)

Journal Articles

Sideward peak of intermediate mass fragments in high energy proton induced reactions

Hirata, Yuichi*; Onishi, Akira*; Nara, Yasushi*; Kido, Toshihiko; Maruyama, Toshiki; Otsuka, Naohiko*; Niita, Koji*; Takada, Hiroshi; Chiba, Satoshi

Nuclear Physics A, 707(1-2), p.193 - 212, 2002/08

 Times Cited Count:10 Percentile:51.17(Physics, Nuclear)

no abstracts in English

Journal Articles

Relativistic nuclear collisions at 10A GeV energies from p+Be to Au+Au with hadronic cascade model

Nara, Yasushi; Otsuka, Naohiko*; Onishi, Akira*; Niita, Koji*; Chiba, Satoshi

Physical Review C, 61(2), p.024901_1 - 024901_19, 2000/02

 Times Cited Count:285 Percentile:99.34(Physics, Nuclear)

no abstracts in English

JAEA Reports

Analysis of the proton-induced reactions at 150MeV $$sim$$ 24GeV by high energy nuclear reaction code JAM

Niita, Koji*; Nara, Yasushi; Takada, Hiroshi; Nakashima, Hiroshi; Chiba, Satoshi; Ikeda, Yujiro

JAERI-Tech 99-065, p.42 - 0, 1999/09

JAERI-Tech-99-065.pdf:1.83MB

no abstracts in English

JAEA Reports

Development of JQMD(Jaeri Quantum Molecular Dynamics) code

Niita, Koji*; Maruyama, Toshiki; Nara, Yasushi; Chiba, Satoshi; Iwamoto, Akira

JAERI-Data/Code 99-042, p.73 - 0, 1999/09

JAERI-Data-Code-99-042.pdf:2.18MB

no abstracts in English

Journal Articles

What is the role of higher baryonic resonances in AA collisions at AGS energies?

Nara, Yasushi; Otsuka, Naohiko; Onishi, Akira*; Maruyama, Tomoyuki

Progress of Theoretical Physics Supplement, (129), p.33 - 37, 1997/00

no abstracts in English

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