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Title: Possible chirality in the doubly-odd {sup 198}Tl nucleus: Residual interaction at play

Abstract

A candidate for chiral bands was found in {sup 198}Tl for the first time in a mass region of oblate (or nonaxial with {gamma}{>=}30 deg.) deformed nuclei. Two bands show very similar quasiparticle alignments, moments of inertia, and B(M1)/B(E2) ratios. They have a relative excitation energy of about 500 keV and different patterns of energy staggering. Calculations using the two-quasiparticle-plus-triaxial-rotor model with residual proton-neutron interaction included show that a triaxial deformation with {gamma}{approx}44 deg. agrees very well with all the experimental observations. Furthermore, considerable energy staggering for both partner bands was calculated for this {pi}h{sub 9/2} x {nu}i{sub 13/2}{sup -1} configuration at {gamma}{approx}30 deg., suggesting that chiral bands may have substantial energy staggering.

Authors:
; ; ; ;  [1]; ; ; ; ; ;  [1]; ;  [2];  [3];  [1];  [4]
  1. iThemba LABS, P.O. Box 722, 7129 Somerset West (South Africa)
  2. Centre de Spectrometrie Nucleaire et de Spectrometrie de Masse, IN2P3, F-91405 Orsay (France)
  3. University of the Western Cape, Private Bag X17, 7535 Bellville (South Africa)
  4. Division of Mathematical Physics, LTH, Lund University, SE-221 00 Lund (Sweden)
Publication Date:
OSTI Identifier:
21192089
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 78; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.78.021305; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHIRALITY; CONFIGURATION; DEFORMATION; DEFORMED NUCLEI; EXCITATION; KEV RANGE; MASS; MOMENT OF INERTIA; ODD-ODD NUCLEI; PROTON-NEUTRON INTERACTIONS; RESIDUAL INTERACTIONS; ROTORS; SIMULATION; THALLIUM 198

Citation Formats

Lawrie, E A, Lawrie, J J, Bark, R A, Mullins, S M, Murray, S H. T., Vymers, P A, Maliage, S M, Masiteng, P L, Ramashidzha, T M, Sharpey-Schafer, J F, Shirinda, O, University of the Western Cape, Private Bag X17, 7535 Bellville, Vieu, Ch, Schueck, C, Lindsay, R, Mabala, G K, Department of Physics, University of Cape Town, Private Bag, 7701 Rondebosch, and Ragnarsson, I. Possible chirality in the doubly-odd {sup 198}Tl nucleus: Residual interaction at play. United States: N. p., 2008. Web. doi:10.1103/PHYSREVC.78.021305.
Lawrie, E A, Lawrie, J J, Bark, R A, Mullins, S M, Murray, S H. T., Vymers, P A, Maliage, S M, Masiteng, P L, Ramashidzha, T M, Sharpey-Schafer, J F, Shirinda, O, University of the Western Cape, Private Bag X17, 7535 Bellville, Vieu, Ch, Schueck, C, Lindsay, R, Mabala, G K, Department of Physics, University of Cape Town, Private Bag, 7701 Rondebosch, & Ragnarsson, I. Possible chirality in the doubly-odd {sup 198}Tl nucleus: Residual interaction at play. United States. https://doi.org/10.1103/PHYSREVC.78.021305
Lawrie, E A, Lawrie, J J, Bark, R A, Mullins, S M, Murray, S H. T., Vymers, P A, Maliage, S M, Masiteng, P L, Ramashidzha, T M, Sharpey-Schafer, J F, Shirinda, O, University of the Western Cape, Private Bag X17, 7535 Bellville, Vieu, Ch, Schueck, C, Lindsay, R, Mabala, G K, Department of Physics, University of Cape Town, Private Bag, 7701 Rondebosch, and Ragnarsson, I. 2008. "Possible chirality in the doubly-odd {sup 198}Tl nucleus: Residual interaction at play". United States. https://doi.org/10.1103/PHYSREVC.78.021305.
@article{osti_21192089,
title = {Possible chirality in the doubly-odd {sup 198}Tl nucleus: Residual interaction at play},
author = {Lawrie, E A and Lawrie, J J and Bark, R A and Mullins, S M and Murray, S H. T. and Vymers, P A and Maliage, S M and Masiteng, P L and Ramashidzha, T M and Sharpey-Schafer, J F and Shirinda, O and University of the Western Cape, Private Bag X17, 7535 Bellville and Vieu, Ch and Schueck, C and Lindsay, R and Mabala, G K and Department of Physics, University of Cape Town, Private Bag, 7701 Rondebosch and Ragnarsson, I},
abstractNote = {A candidate for chiral bands was found in {sup 198}Tl for the first time in a mass region of oblate (or nonaxial with {gamma}{>=}30 deg.) deformed nuclei. Two bands show very similar quasiparticle alignments, moments of inertia, and B(M1)/B(E2) ratios. They have a relative excitation energy of about 500 keV and different patterns of energy staggering. Calculations using the two-quasiparticle-plus-triaxial-rotor model with residual proton-neutron interaction included show that a triaxial deformation with {gamma}{approx}44 deg. agrees very well with all the experimental observations. Furthermore, considerable energy staggering for both partner bands was calculated for this {pi}h{sub 9/2} x {nu}i{sub 13/2}{sup -1} configuration at {gamma}{approx}30 deg., suggesting that chiral bands may have substantial energy staggering.},
doi = {10.1103/PHYSREVC.78.021305},
url = {https://www.osti.gov/biblio/21192089}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 2,
volume = 78,
place = {United States},
year = {Fri Aug 15 00:00:00 EDT 2008},
month = {Fri Aug 15 00:00:00 EDT 2008}
}