Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energy {sup 32}S+{sup 24}Mg{yields}{sup 56}Ni{sup *} reaction

Journal Article · Sat Jan 01 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.014601· OSTI ID:20695883

Gupta, Raj K; Kumar, Rajesh; Singh, Dalip ^[1]; Balasubramaniam, M ^[1]; Beck, C ^[2]; Greiner, Walter ^[3]

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1. Department of Physics, Panjab University, Chandigarh-160014 (India)
2. Institut de Recherches Subatomiques, UMR7500, IN2P3/CNRS, Universite Louis Pasteur, B.P. 28, F-67037 Strasbourg Cedex 2 (France)
3. Institut fuer Theoretische Physik, J-W Goethe Universitaet, D-60054 Frankfurt (Germany)

The dynamical cluster-decay model (DCM) is developed further for the decay of hot and rotating compound nuclei (China) formed in light heavy-ion reactions. The model is worked out in terms of only one parameter, namely the neck-length parameter, which is related to the total kinetic energy TKE(T) or effective Q value Q{sub eff}(T) at temperature T of the hot CN and is defined in terms of the CN binding energy and ground-state binding energies of the emitted fragments. The emission of both the light particles (LP), with A{<=}4,Z{<=}2, as well as the complex intermediate mass fragments (IMF), with 4<A<20,Z>2, is considered as the dynamical collective mass motion of preformed clusters through the barrier. Within the same dynamical model treatment, the LPs are shown to have different characteristics compared to those of the IMFs. The systematic variations of the LP emission cross section {sigma}{sub LP} and IMF emission cross section {sigma}{sub IMF} calculated from the present DCM match exactly the statistical fission model predictions. A nonstatistical dynamical description is developed for the first time for emission of light particles from hot and rotating CN. The model is applied to the decay of {sup 56}Ni* formed in the {sup 32}S+{sup 24}Mg reaction at two incident energies E{sub c.m.}=51.6 and 60.5 MeV. Both the IMFs and average TKE{sup lowbar} spectra are found to compare resonably well with the experimental data, favoring asymmetric mass distributions. The LPs' emission cross section is shown to depend strongly on the type of emitted particles and their multiplicities.

• OSTI ID: 20695883
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
BINDING ENERGY
COMPARATIVE EVALUATIONS
COMPOUND NUCLEI
CROSS SECTIONS
FISSION
GROUND STATES
HOT NUCLEI
ION EMISSION
KINETIC ENERGY
MAGNESIUM 24 TARGET
MASS DISTRIBUTION
MEV RANGE
MULTIPLICITY
NICKEL 56
NUCLEAR DECAY
Q-VALUE
SULFUR 32 REACTIONS