Isospin dependence of the isotopic distributions from 36Ar{^{36}Ar} and 40Ar{^{40}Ar} fragmentation at about 60 MeV/nucleon

Fragments produced in the reactions of 69 MeV/nucleon ${^{36}Ar}$ and 55 MeV/nucleon ${^{40}Ar}$ 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 ${^{36}Ar}$ and ${^{40}Ar}$ 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

Evidence for a proton halo in \chem{^{27}P} through measurements of reaction cross-sections at intermediate energies

Measurements of reaction cross-sections ($\sigma_{\rm R}$'s) for some proton-rich nuclei (N=11\mbox{--}15 isotones) on carbon target at intermediate energies have been performed on RIBLL of HIRFL. A larger enhancement of the $\sigma_{\rm R}$ for $^{27}$P has been observed than for its neighboring nuclei. A large difference between the proton and neutron density distributions (proton halo) is necessary to explain the enhanced cross-section for $^{27}$P within the framework of the Glauber model. Density distributions with HO-type core plus Yukawa-square tail and rms radii for $^{27}$P have been deduced from the measured $\sigma_{\rm R}$ data for the first time, which conform the long tail in its densities as predicted by RMF calculations