Decay studies of the long-lived states in Tl-186

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http://hdl.handle.net/10138/321214

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IDS Collaboration & Pakarinen , J 2020 , ' Decay studies of the long-lived states in Tl-186 ' , Physical Review C (Nuclear Physics) , vol. 102 , no. 2 , 024322 . https://doi.org/10.1103/PhysRevC.102.024322

Title: Decay studies of the long-lived states in Tl-186
Author: IDS Collaboration; Pakarinen, J.
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2020-08-18
Language: eng
Number of pages: 9
Belongs to series: Physical Review C (Nuclear Physics)
ISSN: 0556-2813
URI: http://hdl.handle.net/10138/321214
Abstract: Decay spectroscopy of the long-lived states in Tl-186 has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The a decay from the low-spin (2(-)) state in Tl-186 was observed for the first time and a half-life of 3.4(-0.)(4)(+0.5) s was determined. Based on the alpha-decay energy, the relative positions of the long-lived states were fixed, with the (2(-)) state as the ground state, the 7((+)) state at 77(56) keV, and the 10((-)) state at 451(56) keV. The level scheme of the internal decay of the Tl-186(10((-))) state [T-1/2 = 3.40(9) s], which was known to decay solely through emission of 374-keV gamma-ray transition, was extended and a lower limit for the beta-decay branching b(beta) > 5.9(3)% was determined. The extracted retardation factors for the gamma decay of the 10((-) )state were compared to the available data in neighboring odd-odd thallium isotopes indicating the importance of the pi d(3/2) shell in the isomeric decay and significant structure differences between Tl-184 and Tl-186.
Subject: 114 Physical sciences
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