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Title: Heavy-residue isoscaling as a probe of the symmetry energy of hot fragments

Abstract

The isoscaling properties of isotopically resolved projectile residues from peripheral collisions of {sup 86}Kr (25 MeV/nucleon) {sup 64}Ni (25 MeV/nucleon), and {sup 136}Xe (20 MeV/nucleon) beams on various target pairs are employed to probe the symmetry energy coefficient of the nuclear binding energy. The present study focuses on heavy projectile fragments produced in peripheral and semiperipheral collisions near the onset of multifragment emission (E{sup *}/A=2-3 MeV). For these fragments, the measured average velocities are used to extract excitation energies. The excitation energies, in turn, are used to estimate the temperatures of the fragmenting quasiprojectiles in the framework the Fermi gas model. The isoscaling analysis of the fragment yields provided the isoscaling parameters {alpha} that, in combination with temperatures and isospin asymmetries provided the symmetry energy coefficient of the nuclear binding energy of the hot fragmenting quasiprojectiles. The extracted values of the symmetry energy coefficient at this excitation energy range (2-3 MeV/nucleon) are lower than the typical liquid-drop model value {approx}25 MeV corresponding to ground-state nuclei and show a monotonic decrease with increasing excitation energy. This result is of importance in the formation of hot nuclei in heavy-ion reactions and in hot stellar environments such as supernova.

Authors:
; ; ; ; ; ;  [1]
  1. Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)
Publication Date:
OSTI Identifier:
20771276
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 73; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.73.024606; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ASYMMETRY; BINDING ENERGY; EXCITATION; FERMI GAS MODEL; GROUND STATES; HOT NUCLEI; ION EMISSION; ISOSPIN; KRYPTON 86 REACTIONS; LIQUID DROP MODEL; MEV RANGE; NICKEL 64 REACTIONS; NUCLEAR FRAGMENTATION; NUCLEAR REACTION YIELD; PERIPHERAL COLLISIONS; SYMMETRY; XENON 136 REACTIONS

Citation Formats

Souliotis, G A, Shetty, D V, Keksis, A, Bell, E, Jandel, M, Veselsky, M, and Yennello, S J. Heavy-residue isoscaling as a probe of the symmetry energy of hot fragments. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.024606.
Souliotis, G A, Shetty, D V, Keksis, A, Bell, E, Jandel, M, Veselsky, M, & Yennello, S J. Heavy-residue isoscaling as a probe of the symmetry energy of hot fragments. United States. https://doi.org/10.1103/PhysRevC.73.024606
Souliotis, G A, Shetty, D V, Keksis, A, Bell, E, Jandel, M, Veselsky, M, and Yennello, S J. Wed . "Heavy-residue isoscaling as a probe of the symmetry energy of hot fragments". United States. https://doi.org/10.1103/PhysRevC.73.024606.
@article{osti_20771276,
title = {Heavy-residue isoscaling as a probe of the symmetry energy of hot fragments},
author = {Souliotis, G A and Shetty, D V and Keksis, A and Bell, E and Jandel, M and Veselsky, M and Yennello, S J},
abstractNote = {The isoscaling properties of isotopically resolved projectile residues from peripheral collisions of {sup 86}Kr (25 MeV/nucleon) {sup 64}Ni (25 MeV/nucleon), and {sup 136}Xe (20 MeV/nucleon) beams on various target pairs are employed to probe the symmetry energy coefficient of the nuclear binding energy. The present study focuses on heavy projectile fragments produced in peripheral and semiperipheral collisions near the onset of multifragment emission (E{sup *}/A=2-3 MeV). For these fragments, the measured average velocities are used to extract excitation energies. The excitation energies, in turn, are used to estimate the temperatures of the fragmenting quasiprojectiles in the framework the Fermi gas model. The isoscaling analysis of the fragment yields provided the isoscaling parameters {alpha} that, in combination with temperatures and isospin asymmetries provided the symmetry energy coefficient of the nuclear binding energy of the hot fragmenting quasiprojectiles. The extracted values of the symmetry energy coefficient at this excitation energy range (2-3 MeV/nucleon) are lower than the typical liquid-drop model value {approx}25 MeV corresponding to ground-state nuclei and show a monotonic decrease with increasing excitation energy. This result is of importance in the formation of hot nuclei in heavy-ion reactions and in hot stellar environments such as supernova.},
doi = {10.1103/PhysRevC.73.024606},
url = {https://www.osti.gov/biblio/20771276}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 2,
volume = 73,
place = {United States},
year = {2006},
month = {2}
}