Evolution of fission-fragment mass distributions in the neutron-deficient lead region

中性子欠損した鉛領域原子核の核分裂片質量数分布の変化

Ghys, L.*; Andreyev, A. N.*; Huyse, M.*; Van Duppen, P.*; Sels, S.*; Andel, B.*; Antalic, S.*; Barzakh, A.*; Capponi, L.*; Cocolios, T. E.*; Derkx, X.*; De Witte, H.*; Elseviers, J.*; Fedorov, D. V.*; Fedosseev, V. N.*; Hessberger, F. P.*; Kalaninov, Z.*; Kster, U.*; Lane, J. F. W.*; Liberati, V.*; Lynch, K. M.*; Marsh, B. A.*; 光岡真一; Mller, P.*; 永目諭一郎 ; 西尾勝久 ; 太田周也; Pauwels, D.*; Page, R. D.*; Popescu, L.*; Radulov, D.*; Rajabali, M. M.*; Randrup, J.*; Rapisarda, E.*; Rothe, S.*; Sandhu, K.*; Seliverstov, M. D.*; Sjdin, A. M.*; Truesdale, V. L.*; Van Beveren, C.*; Van den Bergh, P.*; 若林泰生; Warda, M.*

Ghys, L.*; Andreyev, A. N.*; Huyse, M.*; Van Duppen, P.*; Sels, S.*; Andel, B.*; Antalic, S.*; Barzakh, A.*; Capponi, L.*; Cocolios, T. E.*; Derkx, X.*; De Witte, H.*; Elseviers, J.*; Fedorov, D. V.*; Fedosseev, V. N.*; Hessberger, F. P.*; Kalaninov, Z.*; Kster, U.*; Lane, J. F. W.*; Liberati, V.*; Lynch, K. M.*; Marsh, B. A.*; Mitsuoka, Shinichi; Mller, P.*; Nagame, Yuichiro; Nishio, Katsuhisa; Ota, Shuya; Pauwels, D.*; Page, R. D.*; Popescu, L.*; Radulov, D.*; Rajabali, M. M.*; Randrup, J.*; Rapisarda, E.*; Rothe, S.*; Sandhu, K.*; Seliverstov, M. D.*; Sjdin, A. M.*; Truesdale, V. L.*; Van Beveren, C.*; Van den Bergh, P.*; Wakabayashi, Yasuo; Warda, M.*

Low-energy -delayed fission of $^{194,196}$ At and $^{200,202}$ Fr was studied in detail at the mass separator ISOLDE at CERN. The fission-fragment mass distributions of daughter nuclei $^{194,196}$ Po and $^{202}$ Rn indicate a triple-humped structure, marking the transition between asymmetric fission of $^{178,180}$ Hg and symmetric fission in the light Ra-Rn nuclei. Comparison with the macroscopic-microscopic finite-range liquid-drop model and the self-consistent approach employing the Gogny D1S energy density functional yields discrepancies. This demonstrates oncemore the need for dynamical fission calculations, because for both models the potential-energy surfaces lack pronounced structures, in contrast to those for the actinide region.

発表言語	:	English
掲載資料名	:	Physical Review C
巻	:	90
号	:	4
ページ数	:	p.041301_1 - 041301_6
発行年月	:	2014/10
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キーワード	:	核分裂; ベータ崩壊遅延核分裂; 中性子欠損鉛原子核

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論文URL	:	https://doi.org/10.1103/physrevc.90.041301
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