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論文

Effects of nuclear orientation on fusion and fission process for reactions using uranium target nuclei

西尾 勝久; 池添 博; 光岡 真一; 西中 一朗; 牧井 宏之; 渡辺 裕*; 永目 諭一郎; 大槻 勤*; 廣瀬 健太郎*; Hofmann, S.*

AIP Conference Proceedings 1224, p.301 - 310, 2010/04

https://doi.org/10.1063/1.3431429
 被引用回数：5 パーセンタイル：84.63(Physics, Nuclear)

Results on the measurements of (1) evaporation residue (ER) cross-sections for $$^{30}$$Si, $$^{34}$$S + $$^{238}$$U and of (2) fission fragment mass distributions for $$^{30}$$Si,$$^{34,36}$$S, $$^{40}$$Ar + $$^{238}$$U will be discussed. Measurement of ER cross-section was carried out at GSI by using the velocity filter SHIP. Measurement of fission fragment mass distributions was made by using the JAEA tandem accelerator. In the reaction $$^{30}$$Si + $$^{238}$$U, the ER cross-section for $$^{263}$$Sg(5n) suggested no fusion hindance at above-barrier energy, whereas the one for $$^{264}$$Sg(4n) suggested competition between fusion and quasi-fission at sub-barrier energy. This conclusion is consistent with the measured fragment mass distributions, where the asymmetric fission component associated with quasi-fission appears only at sub-barrier energies. In the reaction of $$^{34}$$S + $$^{238}$$U, the ER cross-sections for $$^{267}$$Hs(5n) and $$^{268}$$Hs(4n, new isotope) suggested fusion hindrance both for above- and sub-barrier energies. With the results of fission fragment mass distributions, it is found that quasi-fission has symmetric fission components when projectile mass is relatively large. We will also discuss the variation of the fragment mass distributions for $$^{30}$$Si,$$^{34,36}$$S, $$^{40}$$Ar + $$^{238}$$U.

論文

Lifetime measurements for the first 2$$^{+}$$ states in $$^{162,164}$$Gd populated by the $$beta$$ decay of $$^{162,164}$$Eu

長江 大輔*; 石井 哲朗; 高橋 竜太*; 浅井 雅人; 牧井 宏之; 長 明彦; 佐藤 哲也; 市川 進一; 清水 良文*; 小路 拓也*

AIP Conference Proceedings 1224, p.156 - 160, 2010/04

https://doi.org/10.1063/1.3431410
 被引用回数：2 パーセンタイル：64.1(Physics, Nuclear)

Lifetimes of the first 2$$^{+}$$ states in $$^{162,164}$$Gd have been measured by means of $$beta$$ - $$gamma$$ delayed coincidence technique for mass-separated $$^{162}$$Eu and $$^{164}$$Eu isotopes. Using the obtained lifetimes $$tau$$($$^{162}$$Gd) = 3.98(8) ns and $$tau$$($$^{164}$$Gd) = 4.0(2) ns, $$B(E2;0^{+}rightarrow 2^{+})$$ values were deduced as $$B(E2;0^{+}rightarrow 2^{+})$$($$^{162}$$Gd) = 5.45(11) e$$^{2}$$b$$^{2}$$ and $$B(E2;0^{+}rightarrow 2^{+})$$($$^{164}$$Gd) = 5.2(3) e$$^{2}$$b$$^{2}$$.

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