Decay studies of the long-lived states in <SUP>186</SUP>Tl

Stryjczyk, M, Andel, B, Andreyev, AN, Cubiss, J, Pakarinen, J, Rezynkina, K, Van Duppen, P, Antalic, S, Berry, T, Borge, MJG
et al (show 38 more authors) (2020) Decay studies of the long-lived states in <SUP>186</SUP>Tl. PHYSICAL REVIEW C, 102 (2). 024322-.

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Decay spectroscopy of the long-lived states in $^{186}$Tl has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The $\alpha$ decay from the low-spin $(2^-)$ state in $^{186}$Tl was observed for the first time and a half-life of $3.4^{+0.5}_{-0.4}$ 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 $^{186}$Tl($10^{(-)}$) 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 $^{184}$Tl and $^{186}$Tl.

Item Type: Article
Additional Information: 10 pages, 12 figures
Uncontrolled Keywords: nucl-ex, nucl-ex
Depositing User: Symplectic Admin
Date Deposited: 05 Aug 2020 10:26
Last Modified: 09 Oct 2023 00:44
DOI: 10.1103/PhysRevC.102.024322
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