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Journal Articles

Modelling and analysis of nucleon emission from deuteron-induced reactions at incident energies up to 100 MeV

Nakayama, Shinsuke; Kono, Hiroshi*; Watanabe, Yukinobu*; Iwamoto, Osamu; Ye, T.*; Ogata, Kazuyuki*

EPJ Web of Conferences (Internet), 122, p.04004_1 - 04004_9, 2016/06

 Times Cited Count:4 Percentile:8.08

In recent years, accelerator neutron sources using deuteron-induced reactions on $$^7$$Li, $$^9$$Be, $$^{12}$$C, etc., are proposed for applications in various fields. Engineering design of such facilities requires deuteron nuclear data in a broad incident energy range. We have developed a computational code system dedicated for deuteron nuclear data evaluation in combination with some theoretical models. The code system has been applied to analyses of double-differential $$(d,xp)$$ cross sections for $$^{12}$$C, $$^{27}$$Al, and $$^{58}$$Ni at incident energies up to 100 MeV. On the other hand, there is few experimental double-differential $$(d,xn)$$ cross sections. Therefore, double-differential thick target neutron yields for light nuclei such as $$^9$$Be and $$^{12}$$C are calculated and compared with experimental data. The presentation will show the validation result of the present modelling for nucleon emissions from deuteron-induced reactions through comparison with available experimental data.

Journal Articles

Calculation of beta decay half-lives and delayed neutron branching ratio of fission fragments with Skyrme-QRPA

Minato, Futoshi

EPJ Web of Conferences (Internet), 122, p.10001_1 - 10001_13, 2016/06

BB2015-0323.pdf:0.33MB

 Times Cited Count:1 Percentile:39.19

Nuclear beta-decay and delayed neutron (DN) emission is important for the $$r$$-process nucleosynthesis after the freeze-out and stable and safe operation of nuclear reactors. Even though radioactive beam facilities have enabled us to measure beta-decay and DN branching ratio of neutron-rich nuclei apart from the stability line in the nuclear chart, there are still a lot of nuclei which one cannot investigate. In particular, information on DN is rather scarce than that of $$T_{1/2}$$. To predict $$T_{1/2}$$ and DN branching ratios, we recently developed a method which comprises QRPA and Hauser-Feshbach model. In this work, we calculate fission fragments with $$T_{1/2}le50$$. We obtain the RMS deviation from experimental half-life of 5.06. However, there are odd-even staggering when looking at theoretical $$T_{1/2}$$ along an isotopic chain, which is not observed experimentally. There are also deviations of DN branching ratios. We discuss the cause of these problems and how to remedy them.

Journal Articles

Application of JAERI Quantum Molecular Dynamics model for collisions of heavy nuclei

Ogawa, Tatsuhiko; Hashimoto, Shintaro; Sato, Tatsuhiko; Niita, Koji*

EPJ Web of Conferences (Internet), 122, p.04005_1 - 04005_6, 2016/06

BB2015-0309.pdf:0.24MB

 Times Cited Count:0 Percentile:100

Nucleus-nucleus reactions models are important for radiological safety in heavy ions accelerator facilities such as heavy ion cancer therapy facilities. As one of such models, JAERI Quantum Molecular Dynamics (JQMD) has been successfully used to describe production of residue and secondary particles in nucleus-nucleus collisions. However, it has been pinpointed that formulation of interactions between nucleons were unstable through time evolution therefore heavy nuclei tended to decay before interactions. Such decays could not be distinguished from decay by collisions. In this study, we revised the description of interactions between nucleons to stabilize nuclei before collisions. Moreover, an algorithm to check the stability of ground-state nuclei was introduced. Description of nucleon-nucleon scattering cross sections were improved by introducing the in-medium effects. Fragment production cross sections for heavy targets (e.g. Ag) are predicted in better accuracy by thus developed revised JQMD (JQMD 2.0).

Journal Articles

R-matrix analysis for the $$^8$$Be system and features in the p+$$^7$$Li reaction over resonance region

Kunieda, Satoshi

EPJ Web of Conferences (Internet), 122, p.08003_1 - 08003_13, 2016/06

The p+$$^7$$Li reaction is highly relevant to accelerator applications and fundamental physics. Therefore, those reaction cross-sections should be quantitatively known over the relevant energy range. However, in-depth theoretical/evaluation works have not necessarily been reported despite a number of experimental data which have been measured over the years. In this work, a multi-channel R-matrix analysis is carried out for $$^8$$Be system to know explicit natures in p+$$^7$$Li reaction over the resonance region. Present analysis reveals contribution from each $$J^{pi}$$ to the cross-sections and impact from direct process.

Journal Articles

Feasibility study of nuclear transmutation by negative muon capture reaction using the PHITS code

Abe, Shinichiro; Sato, Tatsuhiko

EPJ Web of Conferences (Internet), 122, p.04002_1 - 04002_6, 2016/06

 Times Cited Count:0 Percentile:100

Nuclear transmutation has been investigated to reduce long-lived fission products (LLFPs) in high level radioactive wastes. However, the nuclear transmutation is difficult for some LLFPs (e.g., $$^{90}$$Sr, $$^{126}$$Sn and $$^{137}$$Cs) having small cross-sections of fission and neutron capture. Negative muon is examined to be applied for the nuclear transmutation. Low energy negative muon is captured on an atom, and then it can decay or be further captured on its nucleus. When negative muon is captured on nucleus, some light particles and residual nucleus are produced. Negative muon capture process has been implemented into latest version of PHITS. In this study, we studied the feasibility of nuclear transmutation by negative muon capture reaction for LLFPs using PHITS. Negative muon capture reaction on 90Sr is simulated. It is found that 94% of negative muons are captured on nucleus, and 66% of $$^{90}$$Sr become stable nuclides or radioactive nuclides having less than 20 days. It is also found that 15% of $$^{90}$$Sr become $$^{87}$$Rb having longer half-life than that of $$^{90}$$Sr.

Oral presentation

Oral presentation

Large-scale shell-model calculation for $$gamma$$-ray strength function

Utsuno, Yutaka; Otsuka, Takaharu*; Shimizu, Noritaka*

no journal, , 

no abstracts in English

Oral presentation

Theoretical study of beta decay for delayed neutron and decay heat

Koura, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Study for fission using multi-nucleon transfer reaction

Nishio, Katsuhisa; Hirose, Kentaro; L$'e$guillon, R.; Orlandi, R.; Nishinaka, Ichiro; Smallcombe, J.*; Chiba, Satoshi; Araki, Shohei*; Watanabe, Yukinobu*; Tatsuzawa, Ryotaro*; et al.

no journal, , 

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