Evidence of shell effects in the excitation function of 0.136-MeV isomeric state populated in the {sup 93}Nb(n,2n){sup 92}Nb{sup m} reaction

Journal Article · Wed Sep 01 00:00:00 EDT 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.034602· OSTI ID:20695523

Gul, K ^[1]

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1. Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad (Pakistan)

Calculation for the excitation function of 0.136-MeV (2{sup +}) isomeric state in {sup 92}Nb has been carried out using Hauser-Feshbach and pre-equilibrium nuclear reaction models in 10-20 MeV energy range. A satisfactory agreement between the calculation and measurements requires the suppression of contribution from the negative-parity doublet consisting of the 0.226-MeV (2{sup -}) and 0.390-MeV (3{sup -}) states in {sup 92}Nb. This can be explained on the basis of highly retarded gamma transitions of higher energy states to the negative-parity doublet on account of its different shell model configuration compared to the shell model configuration of positive-parity states.

• OSTI ID: 20695523
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 70, Issue 3; Other Information: DOI: 10.1103/PhysRevC.70.034602; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ENERGY-LEVEL TRANSITIONS
EXCITATION FUNCTIONS
HAUSER-FESHBACH THEORY
MEV RANGE
NEUTRON REACTIONS
NEUTRONS
NIOBIUM 92
NIOBIUM 93 TARGET
PARITY
SHELL MODELS
SPIN