Giant resonance in highly excited nuclei

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5015170

Sen, S

Isovector giant multipole resonances in both spherical ({sup 110,112}Sn) and deformed ({sup 160}Er) nuclei at high temperature and spin have been studied. In the ground state the giant gamma ray spectrum had proved to be a powerful tool in determining the nuclear shape. These experiments clearly show that the tin nucleus retained its spherical shape all the way to 130 MeV excitation energy. The giant dipole resonance energy decreased slightly with increasing temperature. The increase of the width with temperature was monotonic and given by a power law. The erbium nucleus retained its ground state prolate shape at 57.7 MeV excitation energy. At higher energies the shape becomes less prolate. It is difficult to say definitively if the nucleus becomes spherical or oblate at 74.4 MeV or at 90.5 MeV. The angular distribution of the E1 gamma rays from {sup 112}Sn was found to be isotropic. There was no conspicuous sign of the isovector giant quadrupole resonance in any of the three nuclei. A brief description of a new technique of pileup rejection has been included.

• Research Organization: State Univ. of New York, Stony Brook, NY (USA)
• OSTI ID: 5015170
• Country of Publication: United States
• Language: English

Related Subjects

640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
645100* -- High Energy Physics-- Particle Interactions & Properties-Experimental
651100 -- Nuclear Physics-- Experimental Techniques-- (1980-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
CALCULATION METHODS
DATA
ENERGY LEVELS
ENERGY RANGE
ERBIUM ISOTOPES
EXCITED STATES
EXPERIMENTAL DATA
GIANT RESONANCE MODEL
INFORMATION
ISOTOPES
MEASURING INSTRUMENTS
MEASURING METHODS
MEV RANGE
MEV RANGE 10-100
NUMERICAL DATA
RARE EARTH ISOTOPES
TIN ISOTOPES