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Title: Observation of different isoscaling behavior between emitted fragments and residues

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1413859
Grant/Contract Number:
FG02-93ER40773
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
Journal Volume: 962; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-18 19:34:14; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Youngs, M., McIntosh, A. B., Hagel, K., Heilborn, L., Huang, M., Jedele, A., Kohley, Z., May, L. W., McCleskey, E., Zarrella, A., and Yennello, S. J. Observation of different isoscaling behavior between emitted fragments and residues. Netherlands: N. p., 2017. Web. doi:10.1016/j.nuclphysa.2017.03.009.
Youngs, M., McIntosh, A. B., Hagel, K., Heilborn, L., Huang, M., Jedele, A., Kohley, Z., May, L. W., McCleskey, E., Zarrella, A., & Yennello, S. J. Observation of different isoscaling behavior between emitted fragments and residues. Netherlands. doi:10.1016/j.nuclphysa.2017.03.009.
Youngs, M., McIntosh, A. B., Hagel, K., Heilborn, L., Huang, M., Jedele, A., Kohley, Z., May, L. W., McCleskey, E., Zarrella, A., and Yennello, S. J. 2017. "Observation of different isoscaling behavior between emitted fragments and residues". Netherlands. doi:10.1016/j.nuclphysa.2017.03.009.
@article{osti_1413859,
title = {Observation of different isoscaling behavior between emitted fragments and residues},
author = {Youngs, M. and McIntosh, A. B. and Hagel, K. and Heilborn, L. and Huang, M. and Jedele, A. and Kohley, Z. and May, L. W. and McCleskey, E. and Zarrella, A. and Yennello, S. J.},
abstractNote = {},
doi = {10.1016/j.nuclphysa.2017.03.009},
journal = {Nuclear Physics. A},
number = C,
volume = 962,
place = {Netherlands},
year = 2017,
month = 6
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on April 10, 2018
Publisher's Accepted Manuscript

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  • The isospin dependence of light and heavy fragments emitted from excited nuclear systems and the change in isospin behavior between light and heavy fragments are studied in this report. The <N/Z> is calculated using data reported in the literature and from the results of the simulation code SMM. A transition in the isospin behavior between light and heavy fragments may support the recently reported two-phase bifurcation of excited nuclear matter into a neutron-rich gas phase and a more symmetric liquid phase. (c) 2000 The American Physical Society.
  • Cited by 6
  • 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 gasmore » 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.« less
  • The symmetry energy and the isoscaling properties of the fragments produced in the multifragmentation of {sup 40}Ar, {sup 40}Ca+{sup 58}Fe, {sup 58}Ni reactions at 25, 33, 45, and 53 MeV/nucleon were investigated within the framework of statistical multifragmentation model. The isoscaling parameters {alpha}, from the primary (hot) and secondary (cold) fragment yield distributions, were studied as a function of excitation energy, isospin (neutron-to-proton asymmetry), and fragment symmetry energy. It is observed that the isoscaling parameter {alpha} decreases with increasing excitation energy and decreasing symmetry energy. The parameter {alpha} is also observed to increase with increasing difference in the isospin ofmore » the fragmenting system. The sequential decay of the primary fragments into secondary fragments, when studied as a function of excitation energy and isospin of the fragmenting system, show very little influence on the isoscaling parameter. The symmetry energy, however, has a strong influence on the isospin properties of the hot fragments. The experimentally observed scaling parameters can be explained by symmetry energy that is significantly lower than that for the ground-state nuclei near saturation density. The results indicate that the properties of hot nuclei at excitation energies, densities, and isospin away from the normal ground-state nuclei could be significantly different.« less