New type of asymmetric fission in proton-rich nuclei

Andreyev, A. N.*; Elseviers, J.*; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; Diriken, J.*; Fedorov, D.*; Fedosseev, V.*; Franchoo, S.*; Heredia, J. A.*; Ivanov, O.*; Kster, U.*; Marsh, B. A.*; Nishio, Katsuhisa ; Page, R. D.*; Patronis, N.*; Seliverstov, M.*; Tsekhanovich, I.*; Van den Bergh, P.*; Van De Walle, J.*; Venhart, M.*; Vermote, S.*; Veselsky, M.*; Wagemans, C.*; Ichikawa, Takatoshi*; Iwamoto, Akira; Mller, P.*; Sierk, A. J.*

A very exotic process of -delayed fission of $^{180}$ Tl is studied in detail by using resonant laser ionization with subsequent mass separation at ISOLDE (CERN). In contrast to common expectations, the fission-fragment mass distribution of the post--decay daughter nucleus $^{180}$ Hg (/ = 1.25) is asymmetric. This asymmetry is more surprising since a mass-symmetric split of this extremely neutron-deficient nucleus would lead to two $^{90}$ Zr fragments, with magic = 50 and semi-magic = 40. This is a new type of asymmetric fission, not caused by large shell effects related to fragment magic proton and neutron numbers, as observed in the actinide region. The newly-measured branching ratio for -delayed fission of $^{180}$ Tl is 3.6(7)10 $^{-3}$ %.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	105
Number	:	25
Pages	:	p.252502_1 - 252502_5
Publication Year/Month	:	2010/12
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Paper URL	:	https://doi.org/10.1103/PhysRevLett.105.252502
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Keywords	:	no keyword
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Article of JAEA R&D Review	:	Discovery of a New Type of Fission; The Fission of $^{180}$ Hg is not Influenced by Shells of Fragments[/]
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Registration No. : AA20100730
JAEA Abstracts No. : 39000197
Paper Submission No. : 8429

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