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Report No.

$$beta$$-delayed fission of $$^{180}$$Tl

Elseviers, J.*; Andreyev, A. N.*; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; Diriken, J.*; Fedorov, D.*; Fedosseev, V. N.*; Franchoo, S.*; Ghys, L.*; Heredia, J. A.*; Ivanov, O.*; K$"o$ster, U.*; Marsh, B. A.*; Nishio, Katsuhisa; Page, R. D.*; Patronis, N.*; Seliverstov, M. D.*; Tsekhanovich, I.*; Van den Bergh, P.*; Van De Walle, J.*; Venhart, M.*; Vermote, S.*; Veselsk$'y$, M.*; Wagemans, C.*

The detailed analysis of the $$beta$$-delayed fission data of $$^{180}$$Tl is presented. The experiment was performed by producing a pure beam of $$^{180}$$Tl by means of highly selective resonance laser ionization followed by mass separation with the ISOLDE isotope separator. A surprising asymmetric mass distribution of fission fragments from $$^{180}$$Hg, the daughter of $$^{180}$$Tl $$beta$$ decays, was obtained. Here, the energy calibration of the silicon detectors, which is crucial for a proper determination of the fission fragments' energy and mass split, is presented and the total kinetic energy and its dependence on the mass split ratio is discussed. A more precise $$beta$$-delayed fission probability of 3.2(2)$$times$$10$$^{-3}$$$$%$$ was deduced.



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Category:Physics, Nuclear



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