Successive neutron alignments in the yrast, negative-parity band of oblate-deformed Tl199

Suman, Saket; Tandel, S. K.; Wahid, S. G.; T., Manu; Hemalatha, M.; Maheshwari, B.; Jain, A. K.; Chowdhury, P.; Janssens, R. V. F.; Kondev, F. G.; Carpenter, M. P.; Lauritsen, T.; Seweryniak, D.

doi:10.1103/physrevc.106.024316

Title: Successive neutron alignments in the yrast, negative-parity band of oblate-deformed Tl 199

Journal Article · 15 August 2022 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.106.024316 · OSTI ID:1881479

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Univ. of Mumbai (India); Univ of NC - Chapel Hill
Univ. of Mumbai (India); Univ. of Massachusetts, Lowell, MA (United States)
Univ. of Mumbai (India)
Univ. of Zagreb (Croatia)
Amity Univ. UP, Noida (India)
Univ. of Massachusetts, Lowell, MA (United States)
Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

The negative-parity band structure built on the proton h_9/2 state in ¹⁹⁹Tl has been established up to an excitation energy of 7 MeV and spin of (51/2) ℏ. The level scheme has been extended with the inclusion of fourteen new transitions de-exciting levels at high spin. The ΔI = 1 γ rays are found to be more prominently visible in the spectra when comparing to Δ I = 2 transitions. Rotation alignments are evident at frequencies of 0.22 and 0.30 MeV with both being attributed to the breaking of pairs of neutrons in the i_13/2 subshell. Since ¹⁹⁹Tl is expected to have weak oblate deformation, and lies in a transitional region where competing contributions to the spin are expected from collective rotation and the angular momentum of high-j nucleons, calculations using both the principal axis cranking (PAC) and tilted axis cranking (TAC) formalisms have been performed to understand its structure. Both the PAC and TAC calculations are found to provide a satisfactory description of the evolution of excitation energies with spin. The PAC calculations give a good account of the experimental crossing frequencies and associated spins. Furthermore, the structure of the yrast, negative-parity band in ¹⁹⁹Tl may be primarily understood in terms of the collective rotation of a moderately deformed oblate nucleus, along with contributions to the angular momentum from two pairs of rotation-aligned i_13/2 neutrons.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of North Carolina, Chapel Hill, NC (United States)

Sponsoring Organization:: Croatian Science Foundation; Ecole Polytechnique Federale de Lausanne (EPFL); Government of India; USDOE Office of Science (SC), Nuclear Physics (NP); University Grants Commission (UGC) of India

Grant/Contract Number:: AC02-06CH11357; FG02-94ER40848; FG02-97ER41033; FG02-97ER41041

OSTI ID:: 1881479

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 106; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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