Isospin fractionation in nuclear multifragmentation
Isotopic distributions for light particles and intermediate mass fragments have been measured for 112Sn+112Sn, 112Sn+124Sn, 124Sn+112Sn, and 124Sn+124Sn collisions at E/A = 50 MeV. Isotope, isotone, and isobar yield ratios are utilized to estimate the isotopic composition of the gas phase at freeze-out. Analyses within the equilibrium limit imply that the gas phase is enriched in neutrons relative to the liquid phase represented by bound nuclei. These observations suggest that neutron diffusion is commensurate with or more rapid than fragment production.
Xu
HS
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
Tsang
MB
Liu
TX
Liu
XD
Lynch
WG
Tan
WP
Vander Molen A
Verde
G
Wagner
A
Xi
HF
Gelbke
CK
Beaulieu
L
Davin
B
Larochelle
Y
Lefort
T
de Souza RT
Yanez
R
Viola
VE
Charity
RJ
Sobotka
LG