Successive neutron alignments in the yrast, negative-parity band of oblate-deformed Tl 199
Abstract
The negative-parity band structure built on the proton h9/2 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 i13/2 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 understoodmore »
- Authors:
-
- Univ. of Mumbai (India)
- Univ. of Mumbai (India); Univ. of Massachusetts, Lowell, MA (United States)
- 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)
- Publication Date:
- Research Org.:
- University of North Carolina, Chapel Hill, NC (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP); Government of India; University Grants Commission (UGC) of India; Croatian Science Foundation; Ecole Polytechnique Federale de Lausanne (EPFL)
- OSTI Identifier:
- 1881479
- Alternate Identifier(s):
- OSTI ID: 1908109
- Grant/Contract Number:
- FG02-97ER41041; FG02-94ER40848; FG02-97ER41033; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. C
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 2; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear structure & decays; 190 ≤ A ≤ 219
Citation Formats
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., and Seweryniak, D. Successive neutron alignments in the yrast, negative-parity band of oblate-deformed Tl199. United States: N. p., 2022.
Web. doi:10.1103/physrevc.106.024316.
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. Successive neutron alignments in the yrast, negative-parity band of oblate-deformed Tl199. United States. https://doi.org/10.1103/physrevc.106.024316
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., and Seweryniak, D. Tue .
"Successive neutron alignments in the yrast, negative-parity band of oblate-deformed Tl199". United States. https://doi.org/10.1103/physrevc.106.024316. https://www.osti.gov/servlets/purl/1881479.
@article{osti_1881479,
title = {Successive neutron alignments in the yrast, negative-parity band of oblate-deformed Tl199},
author = {Suman, Saket and Tandel, S. K. and Wahid, S. G. and T., Manu and Hemalatha, M. and Maheshwari, B. and Jain, A. K. and Chowdhury, P. and Janssens, R. V. F. and Kondev, F. G. and Carpenter, M. P. and Lauritsen, T. and Seweryniak, D.},
abstractNote = {The negative-parity band structure built on the proton h9/2 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 i13/2 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 i13/2 neutrons.},
doi = {10.1103/physrevc.106.024316},
journal = {Physical Review. C},
number = 2,
volume = 106,
place = {United States},
year = {Tue Aug 16 00:00:00 EDT 2022},
month = {Tue Aug 16 00:00:00 EDT 2022}
}
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