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論文

Experimental study of the $$Gamma_{p1}/Gamma_{p0}$$ ratios of resonance states in $$^{8}$$Be for deducing the $$^{7}$$Be($$n$$,$$p_{1}$$)$$^{7}$$Li$$^{*}$$ reaction rate relevant to the cosmological lithium problem

岩佐 直仁*; 石川 竣喜*; 久保野 茂*; 榊原 昂浩*; 小湊 和也*; 西尾 勝久; 松田 誠; 廣瀬 健太郎; 牧井 宏之; Orlandi, R.; et al.

Physical Review C, 103(1), p.015801_1 - 015801_5, 2021/01

 被引用回数:1 パーセンタイル:19.67(Physics, Nuclear)

The $$^{9}$$Be($$^{3}$$He,$$alpha$$)$$^{8}$$Be($$p$$)$$^{7}$$Li reaction was studied at $$E_{rm lab}$$($$^{3}$$He)=30 MeV to deduce the branching ratios of $$Gamma_{p1}/Gamma_{p0}$$ of resonant state at 18.91 - 20.1 MeV in $$^{8}$$Be, which are necessary to extract the $$^{7}$$Be($$n$$, $$p_{1}$$)$$^{7}$$Li$$^{*}$$ reaction rate relevant to the $$^{7}$$Be destruction in the big bang nucleosynthesis, from the $$^{7}$$Li($$p$$,$$n_{0}$$)$$^{7}$$Be reaction cross section. The decay protons from $$^{8}$$Be$$^{*}$$ to the ground and first excited states in $$^{7}$$Li were well-separately measured. The $$Gamma_{p1}/Gamma_{p0}$$ ratio of the 19.235-MeV state was deduced to be 3.4$$pm$$1.9%. The 19.86- and 20.1-MeV states were found to decay dominantly into the first excited and ground states of $$^{7}$$Li, respectively.

論文

Multi-layered parallel plate ionization chamber for cross-section measurements of minor actinides

廣瀬 健太郎*; 大槻 勤*; 柴崎 義信*; 岩佐 直仁*; 堀 順一*; 高宮 幸一*; 八島 浩*; 西尾 勝久; 鬼柳 善明*

Nuclear Instruments and Methods in Physics Research A, 621(1-3), p.379 - 382, 2010/09

 被引用回数:3 パーセンタイル:28.87(Instruments & Instrumentation)

A multi-layer parallel plate avalanche chamber (PPIC) has been developed for the measurement of neuron-induced fission cross-section using the lead slowing down neutron spectrometer at the Research Reactor Institute, Kyoto University. The PPIC consists of two sets of multi-layer electrodes to detect fission fragments from two samples located back-to-back between them. The performance of the PPIC was tested with a spontaneous fission of $$^{248}$$Cm. The cross section for the neutron-induced fission of $$^{241}$$Am was successfully obtained using that of $$^{235}$$U as a reference.

口頭

Nuclear structure studies of $$^{254}$$Es region by Coulomb excitation $$gamma$$-ray spectroscopy

柳原 陸斗; 井手口 栄治*; 西尾 勝久; Orlandi, R.; 牧井 宏之; 浅井 雅人; 廣瀬 健太郎; 塚田 和明; 豊嶋 厚史; 佐藤 哲也; et al.

no journal, , 

What is the limit of high Z nucleus, where is the island of stability, is one of the focus of nuclearphysics. Key ingredient to stabilize nucleus in this super-heavy region is shell structure and Z=114,120, N=184 are predicted to be new magic numbers. However, it is not easy to produce such nucleus and study the shell structure. In order to access such shell structure, we are focusing on the deformed nucleus of the heavy mass region including Es isotopes. By studying the excited states, spin and parity, and deformation, we will be able to access the single-particle orbital which is supposed to generate new shell structure at Z=114, 120, N=184 and try to investigate nuclear shell structure in the super-heavy mass region. Coulomb excitation experiment at the Tokai Tandem Accelerator Laboratory of JAEA is planned to measure B(E2) values of low-lying states in $$^{254}$$Es and to deduce the deformation. Unknown high-lying states of $$^{254}$$Es will be also investigated for further understanding of nuclear structure in this region. We obtained $$^{254}$$Es via an international collaboration with ORNL. CAGRA will be used to measure the $$gamma$$ rays from $$^{254}$$Es. Experimental plan and preparation progress will be presented.

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