Shape coexistence and lifetime measurement in {sup 187}Tl nucleus

Journal Article · Sun May 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.054324· OSTI ID:20698674

Chamoli, S K; Kumar, A; Kumar, Rajesh; Govil, I M ^[1]; Joshi, P ^[1]; Singh, R P; Muralithar, S; Bhowmik, R K ^[2]

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1. Department of Physics, Panjab University, Chandigarh 160014 (India)
2. Nuclear Science Centre, Post Box No. 10502, New Delhi 110067 (India)

The lifetime measurements are done for different quasiparticle bands in neutron-deficient {sup 187}Tl nucleus through the recoil distance Doppler shift technique. A sudden change in the transition quadrupole moment is observed for both positive and negative parity prolate bands as one moves from lower spins to higher spins, indicating a major shape transitions in this nucleus. The prolate-oblate shape coexistence picture of this nucleus is discussed in the light of the extracted transition quadrupole moments. For the negative parity {pi}h{sub 9/2} band the transition quadrupole moment for the low K (3/2) prolate sequence is found to be higher than that of the high K (9/2) oblate sequence. The total Routhian surface calculations are done within the framework of the cranked Hartree-Fock-Bogoliubov model to analyze the shape coexistence picture theoretically. The theoretical predictions are found to be in close agreement with the experimental observations. The existence of a superdeformed band is also predicted for the nucleus.

• OSTI ID: 20698674
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CRANKING MODEL
DSA METHOD
HARTREE-FOCK METHOD
HARTREE-FOCK-BOGOLYUBOV THEORY
HIGH SPIN STATES
LIFETIME
NUCLEAR ELECTRIC MOMENTS
NUCLEAR STRUCTURE
PARITY
QUADRUPOLE MOMENTS
RECOILS
SPIN
SUPERDEFORMED NUCLEI
THALLIUM 187