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Report No.

Internal decay of the (10$$^{-}$$) intruder state in $$^{184}$$Tl

Van Beveren, C.*; Andreyev, A. N.; Barzakh, A.*; Cocolios, T. E.*; Fedorov, D.*; Fedosseev, V. N.*; Ferrer, R.*; Huyse, M.*; K$"o$ster, U.*; Lane, J. F. W.*; Liberati, V.*; Lynch, K. M.*; Marsh, B. A.*; Procter, T. J.*; Radulov, D.*; Rapisarda, E.*; Sandhu, K.*; Seliverstov, M. D.*; Van Duppen, P.*; Venhart, M.*; Veselsky, M.*

Decay spectroscopy of $$^{184}$$Tl has been performed at the CERN Isotope Separator On-Line (ISOLDE) facility. An excitation energy of 506.1(1) keV and a half-life of 47.1(7) ms of the intruder based (10$$^{-}$$) state have been extracted. The internal decay characteristics of this state are determined and discussed, extending the systematics of such states in the even-mass thallium nuclei below neutron midshell at N = 104. The retardation factors of the isomeric M2 and E3 transitions are deduced and compared with retardation factors in neighboring odd-mass and even-mass thallium isotopes. The new information is combined with a review of hindered and unhindered $$alpha$$-decay data of $$^{187-192}$$Bi populating levels in daughter nuclei $$^{183-188}$$Tl and supports the interpretation of the intruder character of the (10$$^{-}$$) state in $$^{184}$$Tl.



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Category:Physics, Nuclear



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