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Report No.

$$alpha$$-decay spectroscopy of the new isotope $$^{192}$$At

Andreyev, A. N.*; Antalic, S.*; Ackermann, D.*; Franchoo, S.*; He${ss}$berger, F. P.*; Hofmann, S.*; Huyse, M.*; Kojouharov, I.*; Kindler, B.*; Kuusiniemi, P.*; Lesher, S. R.*; Lommel, B.*; Mann, R.*; M$"u$nzenberg, G.*; Nishio, Katsuhisa   ; Page, R. D.*; Ressler, J. J.*; Streicher, B.*; Saro, S.*; Sulignano, B.*; Van Duppen, P.*; Wiseman, D. R.*

Decay properties of the new neutron-deficient nuclide $$^{192}$$At have been studied in the complete fusion reaction $$^{144}$$Sm($$^{51}$$V,3n)$$^{192}$$At at the velocity filter SHIP of GSI. Two isomeric states with half-lives of 88(6) ms and 11.5(6) ms, respectively, and with complex $$alpha$$-decay schemes were identified in $$^{192}$$At. The decay pattern of one of the isomers suggests that it is based on the oblate-deformed $$pi$$2f7/2 $$times$$ $$nu$$1i13/2 configuration, which confirms the expected onset of deformation in the At isotopes by approaching the neutron midshell at N=104.



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Category:Physics, Nuclear



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