Experimental study of the 2p-2h band in {sup 111}Sn

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

DOI:https://doi.org/10.1103/PHYSREVC.78.037301· OSTI ID:21192252

Ganguly, S ^[1]; Banerjee, P; Ray, I; Kshetri, R; Raut, R; Bhattacharya, S; Saha-Sarkar, M; Goswami, A ^[2]; Basu, S K ^[3]

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1. Department of Physics, Chandernagore College, Hooghly-712136 (India)
2. Saha Institute of Nuclear Physics, Sector-1, Block-AF, Bidhan Nagar, Kolkata-700064 (India)
3. Variable Energy Cyclotron Centre, 1/AF, Bidhannagar, Kolkata-700064 (India)

The {delta}I=2 intruder band in {sup 111}Sn, built upon the 4074.3 keV state, was studied. The states were populated in the {sup 100}Mo({sup 20}Ne, {alpha}5n) reaction at a beam energy of 136 MeV. Mean lifetimes of five states up to 8737.2 keV (spin 43/2{sup -}) have been measured for the first time using the Doppler shift attenuation method. In addition, an upper limit of mean lifetime has been estimated for the 9860.0 keV (spin 47/2{sup -}) state. The B(E2) values, derived from the present lifetime results, indicate a quadrupole deformation of {beta}{sub 2}=0.28{+-}0.02 for the 31/2{sup -} state and decrease progressively with spin, suggesting a reduction in collectivity. The dynamic moment of inertia for the band also decreases continuously up to the highest observed frequencies. These results, along with the predictions of a total Routhian surface calculation, suggest that the {delta}I=2 band in {sup 111}Sn undergoes a change of shape from collective prolate to triaxial with increase in spin and possibly terminates in a noncollective oblate state at a high spin.

• OSTI ID: 21192252
• 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
BEAMS
DEFORMATION
DOPPLER EFFECT
DSA METHOD
FORECASTING
KEV RANGE
LIFETIME
MEV RANGE
MOLYBDENUM 100 TARGET
MOMENT OF INERTIA
NEON 20
NUCLEAR REACTIONS
QUADRUPOLES
REDUCTION
SPECTRAL SHIFT
SPIN
SURFACES
TIN 111