Triaxial shape coexistence and new aligned band in {sup 178}Os

High spin states in {sup 178}Os were studied by means of {sup 165}Ho({sup 20}Ne,p6n){sup 178}Os fusion evaporation reaction at a beam energy of 150 MeV, using a clover detector array. Several new transitions belonging to {sup 178}Os were placed in a level scheme and a new aligned rotational band was...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2009-11, Vol.80 (5)
Main Authors: Kumar, Rajesh, Govil, I. M., Dhal, A., Chaturvedi, L., Praharaj, C. R., Rath, A. K., Kumar, G. Kiran, Basu, S. K., Chakraborty, A., Krishichayan, Mukhopadhyay, S., Pattabiraman, N. S., Ghugre, S. S., Sinha, A. K.
Format: Article
Language:English
Subjects:
ANGULAR CORRELATION
ASYMMETRY
BEAMS
COMPUTERIZED SIMULATION
EXCITATION
GROUND STATES
HARTREE-FOCK METHOD
HEAVY ION FUSION REACTIONS
HIGH SPIN STATES
HOLMIUM 165 TARGET
MEV RANGE 100-1000
NEON 20 REACTIONS
NEUTRON EMISSION
NUCLEAR PHYSICS AND RADIATION PHYSICS
OSMIUM 178
PARITY
POLARIZATION
PROTON-EMISSION DECAY
ROTATIONAL STATES
SPIN
WOODS-SAXON POTENTIAL
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Summary:High spin states in {sup 178}Os were studied by means of {sup 165}Ho({sup 20}Ne,p6n){sup 178}Os fusion evaporation reaction at a beam energy of 150 MeV, using a clover detector array. Several new transitions belonging to {sup 178}Os were placed in a level scheme and a new aligned rotational band was observed in addition to earlier known bands. Spin-parity assignments for most of the proposed levels were made using the deduced directional correlation orientation and polarization measurements for the de-exciting transitions. Experimental results are compared with the projected angular momentum deformed Hartree-Fock model calculations and cranked Woods-Saxon model calculations. This nucleus is predicted to be prolate deformed in the ground state but the {gamma}-softness at higher excitation is revealed by the cranked Woods-Saxon model and the geometrical asymmetric model calculations.
ISSN:0556-2813
1089-490X
DOI:10.1103/PHYSREVC.80.054319