Fragment yield distribution and the influence of neutron composition and excitation energy in multifragmentation reactions

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

DOI:https://doi.org/10.1103/PhysRevC.71.024602· OSTI ID:20695947

Shetty, D V; Yennello, S J; Souliotis, G A; Bell, E; Keksis, A ^[1]; Botvina, A S ^[1]

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1. Cyclotron Institute, Texas A and M University, College Station, TX 77843 (United States)

The isotopic properties of the primary and secondary fragment yield distribution in the multifragmentation of {sup 58}Fe+{sup 58}Ni and {sup 58}Fe+{sup 58}Fe reactions are studied with respect to the {sup 58}Ni+{sup 58}Ni reaction at 30, 40, and 47 MeV/nucleon. The reduced neutron and proton densities from the observed fragment yield distribution show primary fragment yield distribution to undergo strongly secondary deexcitations. The effect is small at the lowest excitation energy and smallest neutron-to-proton ratio and becomes large at higher excitation energies and higher neutron-to-proton ratio. The symmetry energy of the primary fragments deduced from the reduced neutron density is significantly lower than that for the normal nuclei at saturation density, indicating that the fragments are highly excited and formed at a reduced density. Furthermore, the symmetry energy is also observed to decrease slowly with increasing excitation energy. The observed effect is explained using the statistical multifragmentation model.

• OSTI ID: 20695947
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DISTRIBUTION
ENERGY LEVELS
EXCITATION
IRON 58 REACTIONS
IRON 58 TARGET
MEV RANGE
NEUTRON DENSITY
NEUTRONS
NICKEL 58 TARGET
NUCLEAR FRAGMENTATION
NUCLEAR MATTER
NUCLEAR REACTION YIELD
PROTON DENSITY
PROTONS
STATISTICAL MODELS
SYMMETRY