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Nuclear orientation in the reaction $$^{34}$$S+$$^{238}$$U and synthesis of the new isotope $$^{268}$$Hs

$$^{34}$$S+$$^{238}$$U反応における標的原子核の変形効果及び新同位体$$^{268}$$Hsの合成

西尾 勝久   ; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; 有友 嘉浩; Comas, V. F.*; D$"u$llmann, Ch. E.*; Gorshkov, A.*; Graeger, R.*; 萩野 浩一*; Heinz, S.*; Heredia, J. A.*; 廣瀬 健太郎*; 池添 博; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; Lommel, B.*; Mann, R.*; 光岡 真一; 永目 諭一郎 ; 西中 一朗; 大槻 勤*; Popeko, A. G.*; Saro, S.*; Sch$"a$del, M.*; T$"u$rler, A.*; 渡辺 裕*; Yakushev, A.*; Yeremin, A. V.*

Nishio, Katsuhisa; Hofmann, S.*; He${ss}$berger, F. P.*; Ackermann, D.*; Antalic, S.*; Aritomo, Yoshihiro; Comas, V. F.*; D$"u$llmann, Ch. E.*; Gorshkov, A.*; Graeger, R.*; Hagino, Koichi*; Heinz, S.*; Heredia, J. A.*; Hirose, Kentaro*; Ikezoe, Hiroshi; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; Lommel, B.*; Mann, R.*; Mitsuoka, Shinichi; Nagame, Yuichiro; Nishinaka, Ichiro; Otsuki, Tsutomu*; Popeko, A. G.*; Saro, S.*; Sch$"a$del, M.*; T$"u$rler, A.*; Watanabe, Yutaka*; Yakushev, A.*; Yeremin, A. V.*

Synthesis of isotopes of the element hassium was studied using the reaction $$^{34}$$S+$$^{238}$$U$$rightarrow$$$$^{272}$$Hs*. At a kinetic energy of 163.0 MeV in the center of mass system we observed one $$alpha$$-decay chain starting at the isotope $$^{267}$$Hs. The cross-section was 1.8$$^{+4.2}_{-1.5}$$pb. At 152.0 MeV one decay of the new isotope $$^{268}$$Hs was observed. It decays with a half-life of 0.38$$^{+1.8}_{-0.17}$$s by 9479$$pm$$16 keV $$alpha$$-particle emission. Spontaneous fission of the daughter nucleus $$^{264}$$Sg was confirmed. The measured cross-section was 0.54$$^{+1.3}_{-0.45}$$pb. In-beam measurements of fission fragment mass distributions were performed to obtain information on the fusion probability at various orientation of the deformed target nucleus. The distributions changed from symmetry to asymmetry when the beam energy was changed from above-barrier to sub-barrier values, indicating orientation effects on fusion and/or quasifission. It was found that the distribution of symmetric mass fragments originates not only from fusion-fission, but has a strong component from quasifission. This result significantly influences the interpretation of data obtained from measurements of symmetric mass distributions with respect to extracting evaporation residue cross-sections.

使用言語

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English

掲載資料名

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Physical Review C

巻

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82

号

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2

ページ数

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p.024611_1 - 024611_9

発行年月

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2010/08

発表会議名

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開催年月

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開催都市

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開催国

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キーワード

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no keyword

特許データ

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PDF

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論文URL

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https://doi.org/10.1103/PhysRevC.82.024611

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研究データの公開先DOI

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使用施設

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タンデム加速器  

広報プレスリリース

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論文解説記事
(成果普及情報誌)

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受委託・共同研究相手機関

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東北大学

Access

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- Accesses

InCites™

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パーセンタイル：96.28

分野：Physics, Nuclear

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