Decay spectroscopy of ₈₂<SUP>179</SUP>Pb₉₇ and evidence for a 9/2<SUP>-</SUP> intruder state in ₈₁<SUP>179</SUP>Tl₉₈

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Badran, H, Scholey, C, Uusitalo, J, Auranen, K, Grahn, T, Greenlees, PT, Herzan, A, Jakobsson, U, Julin, R, Juutinen, S et al (show 12 more authors) , Konki, J, Leino, M, Mallaburn, MJ, Pakarinen, J, Papadakis, P ORCID: 0000-0001-7509-4257, Partanen, J, Peura, P, Rahkila, P, Sandzelius, M, Saren, J, Sorri, J and Stolze, S (2017) Decay spectroscopy of ₈₂<SUP>179</SUP>Pb₉₇ and evidence for a 9/2<SUP>-</SUP> intruder state in ₈₁<SUP>179</SUP>Tl₉₈. PHYSICAL REVIEW C, 96 (6). 064314-.

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Abstract

The very neutron-deficient isobars Pb179 and Tl179 have been produced using the fusion-evaporation reactions Pd104(Kr78,xpyn), where x≤1 and y≥2. The gas-filled separator RITU was employed to transport and separate the recoiling nuclei of interest from the scattered beam and unwanted products. The GREAT spectrometer was used to study the decay properties through α-α and α-γ correlations, which has allowed the ground state of Pb179 to be assigned as Iπ=9/2-. The decay of Pb179 was measured to have an α-particle energy and half-life of Eα=7348(5)keV and t1/2=2.7(2) ms, respectively. A search for a νi13/2 state in Pb179 was performed, but only a limit of excitation energy and half-life was obtained. In Tl179 a t1/2=114-10+18 ns isomeric state, likely at an excitation energy of 904.5(9) keV, was identified and is tentatively assigned to be a 9/2- proton intruder state.

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	15 Mar 2018 11:27
Last Modified:	16 Mar 2024 20:38
DOI:	10.1103/PhysRevC.96.064314
Open Access URL:	http://urn.fi/URN:NBN:fi:jyu-201801021017
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3019055