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Title: Tracing the evolution of the symmetry energy of hot nuclear fragments from the compound nucleus towards multifragmentation

Abstract

The evolution of the symmetry energy coefficient of the binding energy of hot fragments with increasing excitation is explored in multifragmentation processes following heavy-ion collisions below the Fermi energy. In this work, high-resolution mass spectrometric data on isotopic distributions of projectile-like fragments are systematically compared to calculations involving the statistical multifragmentation model (SMM). Within the SMM picture, the present study suggests a gradual decrease of the symmetry energy coefficient of the hot primary fragments from 25 MeV at the compound nucleus regime towards 15 MeV in the multifragmentation regime. The isotopic distributions of the hot primary fragments are found to be very wide and extend towards the neutron drip line. These findings are expected to have important implications in the modeling of the composition and the evolution of hot and dense astrophysical environments, such as those of core-collapse supernova.

Authors:
; ; ; ; ;  [1];  [2]
  1. Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)
  2. Institute for Nuclear Research, Russian Academy of Sciences, RU-117312 Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
20990925
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.75.011601; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BINDING ENERGY; COMPOUND NUCLEI; DISTRIBUTION; EXCITATION; HEAVY ION REACTIONS; MASS SPECTROSCOPY; MEV RANGE 10-100; NEUTRONS; NUCLEAR FRAGMENTS; SUPERNOVAE; SYMMETRY

Citation Formats

Souliotis, G. A., Shetty, D. V., Keksis, A. L., Jandel, M., Veselsky, M., Yennello, S. J., and Botvina, A. S.. Tracing the evolution of the symmetry energy of hot nuclear fragments from the compound nucleus towards multifragmentation. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.011601.
Souliotis, G. A., Shetty, D. V., Keksis, A. L., Jandel, M., Veselsky, M., Yennello, S. J., & Botvina, A. S.. Tracing the evolution of the symmetry energy of hot nuclear fragments from the compound nucleus towards multifragmentation. United States. doi:10.1103/PHYSREVC.75.011601.
Souliotis, G. A., Shetty, D. V., Keksis, A. L., Jandel, M., Veselsky, M., Yennello, S. J., and Botvina, A. S.. Mon . "Tracing the evolution of the symmetry energy of hot nuclear fragments from the compound nucleus towards multifragmentation". United States. doi:10.1103/PHYSREVC.75.011601.
@article{osti_20990925,
title = {Tracing the evolution of the symmetry energy of hot nuclear fragments from the compound nucleus towards multifragmentation},
author = {Souliotis, G. A. and Shetty, D. V. and Keksis, A. L. and Jandel, M. and Veselsky, M. and Yennello, S. J. and Botvina, A. S.},
abstractNote = {The evolution of the symmetry energy coefficient of the binding energy of hot fragments with increasing excitation is explored in multifragmentation processes following heavy-ion collisions below the Fermi energy. In this work, high-resolution mass spectrometric data on isotopic distributions of projectile-like fragments are systematically compared to calculations involving the statistical multifragmentation model (SMM). Within the SMM picture, the present study suggests a gradual decrease of the symmetry energy coefficient of the hot primary fragments from 25 MeV at the compound nucleus regime towards 15 MeV in the multifragmentation regime. The isotopic distributions of the hot primary fragments are found to be very wide and extend towards the neutron drip line. These findings are expected to have important implications in the modeling of the composition and the evolution of hot and dense astrophysical environments, such as those of core-collapse supernova.},
doi = {10.1103/PHYSREVC.75.011601},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}