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Report No.

$$alpha$$-decay properties of $$^{200,202}$$Fr

Ghys, L.*; Andreyev, A. N.; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Capponi, L.*; Cocolios, T. E.*; Cubiss, J.*; Derkx, X.*; De Witte, H.*; Elseviers, J.*; Hessberger, F. P.*; Kalaninov$'a$, Z.*; K$"o$ster, U.*; Lane, J. F. W.*; Liberati, V.*; Mitsuoka, Shinichi*; Nagame, Yuichiro* ; Nishio, Katsuhisa   ; Ota, Shuya*; Pauwels, D.*; Page, R. D.*; Popescu, L.*; Radulov, D.*; Rajabali, M. M.*; Rapisarda, E.*; Sandhu, K.*; Truesdale, V. L.*; Van den Bergh, P.*; Wakabayashi, Yasuo*

The aim of this work was to investigate the $$alpha$$-decay properties of $$^{200,202}$$Fr and daughter products. Neutron-deficient francium nuclei are produced at ISOLDE-CERN bombarding a UCx target with 1.4 GeV protons. Due to the very high statistics and the high beam purity, improved decay data for $$^{202}$$Fr and its daughters were obtained. The observation of crossover transitions positioned the isomeric high-spin level of $$^{198}$$At at an excitation energy of 265(3) keV. Half-life values of 4.47(5) s and 1.28(10) s were extracted for the ground state and isomeric state of $$^{198}$$At and 52(3) ms for the ground-state decay of $$^{200}$$Fr.



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Category:Physics, Nuclear



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