Eur. Phys. J. A 10, 381-385
Isospin dependence of the isotopic distributions from 36Ar and 40Ar fragmentation at about 60 MeV/nucleonD.Q. Fang1, W.Q. Shen1, 2, J. Feng1, X.Z. Cai1, Y.G. Ma1, H.Y. Zhang1, P.Y. Hu1, W.L. Zhan3, Z.Y. Guo3, G.Q. Xiao3, J.X. Li3, M. Wang3, J.F. Wang3, Z.J. Ning3, J.Q. Wang3, J.S. Wang3, Q.J. Wang3 and Z.Q. Chen3
1 Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, China
2 Ningbo University, Ningbo 315211, China
3 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
(Received: 15 November 2000 / Revised version: 4 April 2001 Communicated by W.F. Henning)
Fragments produced in the reactions of 69 MeV/nucleon 36Ar and 55 MeV/nucleon 40Ar on a Be target have been measured experimentally. The isotopic distributions from fragmentation reaction for both projectiles are compared with modified statistical abrasion-ablation model calculations. A strong isospin effect exhibits in the fragment distributions produced in 36Ar and 40Ar fragmentation. Experimental evidence for the disappearance of the isospin effect in the isotopic distributions produced by projectile fragmentation is observed with the increase of the violence of nuclear reaction.
25.70.Mn - Projectile and target fragmentation.
24.10.-i - Nuclear-reaction models and methods.
© Società Italiana di Fisica, Springer-Verlag 2001