Effect of rotation on the isovector giant dipole resonance in certain calcium isotopes

Journal Article · Mon Feb 01 00:00:00 EST 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.37.853· OSTI ID:5641703

Shanmugam, G; Thiagasundaram, M

The isovector giant dipole resonances in certain rapidly rotating calcium isotopes wherein the bulk of the angular momentum is of an aligned nature are analyzed microscopically in the framework of the random phase approximation. The shape and deformation of the above nuclei at high spins are determined by the Mottelson-Nilsson method for rotating light nuclei. The allowed angular velocities for these deformations are obtained by the Fermi liquid drop model. The splitting of the resonance energies and the changes in the photoabsorption cross sections caused by rotation are studied in these nuclei by a simple schematic model of a rotating anisotropic harmonic oscillator which is justifiable in the case of the light nuclei considered. The results obtained show the general broadening of resonance widths in these light nuclei similar to that observed in the case of rare earth nuclei. The narrowing down of resonance widths in certain cases at higher angular momenta, suspected in lighter nuclei experimentally, is also theoretically observed and explained in the case of /sup 40/Ca as due to the shrinking effect of nuclear deformation at high spins.

• Research Organization: Department of Physics, Presidency College, Madras 600 005, India
• OSTI ID: 5641703
• Journal Information: Phys. Rev. C; (United States), Vol. 37:2
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALCIUM ISOTOPES
GIANT RESONANCE
ANGULAR MOMENTUM
COLLECTIVE MODEL
CROSS SECTIONS
DIPOLE MOMENTS
ENERGY DEPENDENCE
HARMONIC OSCILLATOR MODELS
HIGH SPIN STATES
LIQUID DROP MODEL
NILSSON-MOTTELSON MODEL
NUCLEAR DEFORMATION
PHOTONUCLEAR REACTIONS
RANDOM PHASE APPROXIMATION
ALKALINE EARTH ISOTOPES
DEFORMATION
ENERGY LEVELS
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEAR REACTIONS
RESONANCE
653001* - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models
653003 - Nuclear Theory- Nuclear Reactions & Scattering