Multiple band structures of {sup 131}Cs

Journal Article · Mon Sep 15 04:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.034313· OSTI ID:21192195

Sihotra, S ^[1]; Palit, R; Naik, Z; Joshi, P K; Deo, A Y; Jain, H C ^[2]; Singh, K; Goswamy, J; Mehta, D; Singh, N ^[1]; Malik, S S ^[3]; Praharaj, C R ^[4]

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1. Department of Physics, Panjab University, Chandigarh-160014 (India)
2. Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai-400005 (India)
3. Department of Physics, Guru Nanak Dev University, Amritsar-143005 (India)
4. Institute of Physics, Bhubaneswar-751005 (India)

Excited states in {sup 131}Cs were investigated through in-beam {gamma}-ray spectroscopic techniques following its population in the {sup 124}Sn({sup 11}B, 4n) fusion-evaporation reaction at a beam energy of 46 MeV. The previously known level scheme has been substantially extended up to {approx}9 MeV excitation energy and 49/2({Dirac_h}/2{pi}) spin with the addition of seven new band structures. The present level scheme consisting of 15 bands exhibits a variety of collective features in this nucleus at intermediate spin. The excitation energies of the observed levels in different bands and the corresponding ratios of transition strengths, i.e., B(M1)/B(E2), have been compared with the results of projected deformed Hartree-Fock calculations based on various quasiparticle configurations. A strongly coupled band has been reassigned a high-K three-quasiparticle {pi}h{sub 11/2} x {nu}(h{sub 11/2}d{sub 3/2}) configuration based on the properties of this band and that of its new coupled side band. The configurations of these bands are also discussed in the framework of tilted-axis cranking model calculations and the systematics of the odd-A Cs isotopes. Additional three energetically closely placed coupled bands have been assigned different unpaired three-quasiparticle configurations. {gamma}-vibrational bands coupled to the {pi}h{sub 11/2} and {pi}g{sub 7/2} single-particle configurations have been reported in this nucleus. Observation of new E1 transitions linking the opposite-parity {pi}h{sub 11/2} and {pi}d{sub 5/2} bands provides fingerprints of possible octupole correlations.

• OSTI ID: 21192195
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 78; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BORON 11 BEAMS
CESIUM 131
CONFIGURATION
CORRELATIONS
CRANKING MODEL
E1-TRANSITIONS
E2-TRANSITIONS
EVAPORATION
EXCITATION
GAMMA RADIATION
GAMMA SPECTROSCOPY
HARTREE-FOCK METHOD
M1-TRANSITIONS
MEV RANGE 10-100
NEUTRON EMISSION
NUCLEAR REACTIONS
OCTUPOLES
SPIN
TIN 124 TARGET
VIBRATIONAL STATES