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Report No.
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$$beta$$-delayed fission and $$alpha$$ decay of $$^{196}$$At

Truesdale, V. L.*; Andreyev, A. N.; Ghys, L.*; 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.*; He${ss}$berger, F. P.*; Kalaninov$'a$, Z.*; K$"o$ster, U.*; Lane, J. F. W.*; Liberati, V.*; Lynch, K. M.*; Marsh, B. A.*; Mitsuoka, Shinichi; Nagame, Yuichiro ; Nishio, Katsuhisa  ; Ota, Shuya*; Pauwels, D.*; Popescu, L.*; Radulov, D.*; Rapisarda, E.*; Rothe, S.*; Sandhu, K.*; Seliverstov, M. D.*; Sj$'o$din, A. M.*; Van Beveren, C.*; Van den Bergh, P.*; Wakabayashi, Yasuo*

A nuclear-decay spectroscopy study of the neutron-deficient isotope $$^{196}$$At is reported where an isotopically pure beam was produced using the selective Resonance Ionization Laser Ion Source and On-Line Isotope Mass Separator (CERN). The fine-structure $$alpha$$ decay of $$^{196}$$At allowed the low-energy excited states in the daughter nucleus $$^{192}$$Bi to be investigated. A $$beta$$-delayed fission study of $$^{196}$$At was also performed. A mixture of symmetric and asymmetric fission-fragment mass distributions of the daughter isotope $$^{196}$$Po (populated by $$beta$$ decay of $$^{196}$$At) was deduced based on the measured fission-fragment energies. A $$beta$$DF probability $$P_{rm beta DF}$$($$^{196}$$At) = 9(1)$$times$$10$$^{-5}$$ was determined.

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Category:Physics, Nuclear

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