Damping of giant resonances in hot nuclei

Journal Article · Tue Oct 01 00:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.44.1713· OSTI ID:5098928

Smerzi, A; Bonasera, A; DiToro, M ^[1]

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1. Dipartimento di Fisica dell'Universita' di Catania, 57, Corso Italia, 95129 Catania, Italy Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Catania, Italy Laboratorio Nazionale del Sud, Catania (Italy)

The effect of one- and two-body dissipation on the damping of giant dipole resonances (GDR's) is studied in a semiclassical approach solving a Vlasov equation with a collision relaxation time. The latter is microscopically evaluated from the equilibration of a distorted momentum distribution in a kinetic approach. Temperature effects are introduced in the initial distribution function and in Pauli blocking rearrangement in the path to equilibration. Particle emission is also computed in the same microscopic picture. Without free parameters a good agreement with data is obtained for GDR's on the ground state. For collective vibration built on excited states we get a dramatic increase of the widths due to the enhancement of nucleon-nucleon ({ital NN}) collisions. The saturation observed in some experiments is explained as due to the competition of particle evaporation which cools down the system. The transition to first-sound modes is ruled out for the persistence of long-nucleon mean free paths at relatively high temperatures.

• OSTI ID: 5098928
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 44:4; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GIANT RESONANCE
SEMICLASSICAL APPROXIMATION
ANGULAR MOMENTUM
BOLTZMANN-VLASOV EQUATION
COULOMB FIELD
COUPLING CONSTANTS
DIPOLE MOMENTS
ENERGY LEVELS
MEAN FREE PATH
MEAN-FIELD THEORY
NUCLEON-NUCLEON INTERACTIONS
RANDOM PHASE APPROXIMATION
RELAXATION TIME
SINGLE-PARTICLE MODEL
TWO-BODY PROBLEM
WOODS-SAXON POTENTIAL
BARYON-BARYON INTERACTIONS
DIFFERENTIAL EQUATIONS
ELECTRIC FIELDS
EQUATIONS
HADRON-HADRON INTERACTIONS
INTERACTIONS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
NUCLEAR POTENTIAL
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
POTENTIALS
RESONANCE
653001* - Nuclear Theory- Nuclear Structure
Moments
Spin
& Models
657002 - Theoretical & Mathematical Physics- Classical & Quantum Mechanics