Isoscaling of fragments withfrom reconstructed quasiprojectiles
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In heavy-ion collisions, isoscaling provides a method for studying the evolution of nuclear symmetry energy as a function of excitation energy. One challenge in using isoscaling is to accurately determine the neutron-to-proton ratio (N/Z) of the fragmenting source. Isoscaling results are presented for the reactions of Kr86,78+Ni64,58 at 35 MeV/nucleon taken on the NIMROD-ISiS array at Texas A&M University. The N/Z of the source was calculated from the isotopically identified fragments and experimentally measured neutrons emitted from reconstructed quasiprojectiles. These data exhibit isoscaling for elements with Z=1-17 over a broad range of isotopes. The isoscaling parameter is shown to increase with increasing difference in the neutron composition () of the compared sources. For a selected , the ratio / is also shown to decrease with increasing excitation energy. This may reflect a corresponding decrease in the nuclear symmetry energy. 2009 The American Physical Society.
author list (cited authors)
Wuenschel, S., Dienhoffer, R., Souliotis, G. A., Galanopoulos, S., Kohley, Z., Hagel, K., ... Yennello, S. J.
complete list of authors
Wuenschel, S||Dienhoffer, R||Souliotis, GA||Galanopoulos, S||Kohley, Z||Hagel, K||Shetty, DV||Huseman, K||May, LW||Soisson, SN||Stein, BC||Caraley, AL||Yennello, SJ