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Title	Internal decay of the (10$^{-}$) intruder state in $^{184}$TI
Author(s)	Van Beveren, C (Leuven U.) ; Andreyev, A N (York U., England ; JAEA, Ibaraki) ; Barzakh, A E (St. Petersburg, INP) ; Cocolios, T E (CERN ; Manchester U.) ; Fedorov, D (St. Petersburg, INP) ; Fedosseev, V N (CERN) ; Ferrer, R (Leuven U.) ; Huyse, M (Leuven U.) ; Köster, U (Laue-Langevin Inst.) ; Lane, J (Paisley U.) ; Liberati, V (Paisley U.) ; Lynch, K M (CERN ; Manchester U.) ; Marsh, B A (CERN) ; Procter, T J (Manchester U.) ; Radulov, D (Leuven U.) ; Rapisarda, E (CERN ; Leuven U.) ; Sandhu, K (Paisley U.) ; Seliverstov, M D (York U., England ; St. Petersburg, INP ; CERN ; Paisley U.) ; Van Duppen, P (Leuven U.) ; Venhart, M (Bratislava, Inst. Phys.) ; Veselsky, M (Bratislava, Inst. Phys.)
Publication	APS, 2015
Number of pages	8
In:	Phys. Rev. C 92 (2015) 014325
DOI	10.1103/PhysRevC.92.014325
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN ISOLDE
Abstract	Decay spectroscopy of $^{184}$TI 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 $M$2 and $E$3 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 α-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 $^{184}$TI.
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