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Excitation energy dependence of fragment-mass distributions from fission of $$^{180,190}$$Hg formed in fusion reactions of $$^{36}$$Ar + $$^{144,154}$$Sm

$$^{36}$$Ar+$$^{144,154}$$Smの核融合反応で生成される$$^{180,190}$$Hg原子核の核分裂片質量数分布の励起エネルギー依存性

西尾 勝久   ; Andreyev, A. N.*; Chapman, R.*; Derkx, X.*; D$"u$llmann, C. E.*; Ghys, L.*; He${ss}$berger, F. P.*; 廣瀬 健太郎  ; 池添 博*; Khuyagbaatar, J.*; Kindler, B.*; Lommel, B.*; 牧井 宏之   ; 西中 一朗; 大槻 勤*; Pain, S. D.*; Sagaidak, R.*; Tsekhanovich, I.*; Venhart, M.*; 若林 泰生*; Yan, S.*

Nishio, Katsuhisa; Andreyev, A. N.*; Chapman, R.*; Derkx, X.*; D$"u$llmann, C. E.*; Ghys, L.*; He${ss}$berger, F. P.*; Hirose, Kentaro; Ikezoe, Hiroshi*; Khuyagbaatar, J.*; Kindler, B.*; Lommel, B.*; Makii, Hiroyuki; Nishinaka, Ichiro; Otsuki, Tsutomu*; Pain, S. D.*; Sagaidak, R.*; Tsekhanovich, I.*; Venhart, M.*; Wakabayashi, Yasuo*; Yan, S.*

Mass distributions of fission fragments from the compound nuclei $$^{180}$$Hg and $$^{190}$$Hg formed in fusion reactions $$^{36}$$Ar+$$^{144}$$Sm and $$^{36}$$Ar+$$^{154}$$Sm, respectively, were measured at initial excitation energies of $$E^*$$($$^{180}$$Hg)=,33$$-$$66 MeV and $$E^*$$($$^{190}$$Hg)=,48$$-$$71 MeV. In the fission of $$^{180}$$Hg, the mass spectra were well reproduced by assuming only an asymmetric-mass division, with most probable light and heavy fragment masses $$bar{A}_{rm L}$$/$$bar{A}_{rm H}=$$79$$/$$101. The mass asymmetry for $$^{180}$$Hg agrees well with that obtained in the low-energy $$beta^textrm{+}$$/EC-delayed fission of $$^{180}$$Tl, from our earlier ISOLDE(CERN) experiment. Fission of $$^{190}$$Hg is found to proceed in a similar way, delivering the mass asymmetry of $$bar{A}_{rm L}$$/$$bar{A}_{rm H}=$$83$$/$$107, throughout the measured excitation energy range. The persistence as a function of excitation energy of the mass-asymmetric fission for both proton-rich Hg isotopes gives strong evidence for the survival of microscopic effects up to effective excitation energies of compound nuclei as high as 40,MeV. This behavior is different from fission of actinide nuclei and heavier mercury isotope $$^{198}$$Hg.

使用言語

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English

掲載資料名

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Physics Letters B

巻

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748

号

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ページ数

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p.89 - 94

発行年月

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2015/09

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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核分裂; 質量数分布; タンデム加速器

特許データ

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PDF

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論文URL

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https://doi.org/10.1016/j.physletb.2015.06.068

研究データの公開先DOI

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本成果にかかわる研究データのリンクです。

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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Access

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- Accesses

InCites™

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パーセンタイル：94.17

分野：Astronomy & Astrophysics

Altmetrics

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