Eur. Phys. J. A 12, 335-339 (2001)
Evidence for a proton halo in through measurements of reaction cross-sections at intermediate energiesD.Q. Fang1, W.Q. Shen1, 2, J. Feng1, X.Z. Cai1, H.Y. Zhang1, Y.G. Ma1, C. Zhong1, Z.Y. Zhu1, W.Z. Jiang1, W.L. Zhan3, Z.Y. Guo3, G.Q. Xiao3, J.S. Wang3, J.Q. Wang3, J.X. Li3, M. Wang3, J.F. Wang3, Z.J. Ning3, Q.J. Wang3 and Z.Q. Chen3
1 Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, PRC
2 Ningbo University, Ningbo 315211, PRC
3 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, PRC
(Received: 23 May 2001 / Revised version: 21 August 2001 Communicated by W.F. Henning)
Measurements of reaction cross-sections ( 's) for some proton-rich nuclei ( isotones) on carbon target at intermediate energies have been performed on RIBLL of HIRFL. A larger enhancement of the for 27P 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 27P within the framework of the Glauber model. Density distributions with HO-type core plus Yukawa-square tail and rms radii for 27P have been deduced from the measured data for the first time, which conform the long tail in its densities as predicted by RMF calculations.
25.60.Dz - Interaction and reaction cross-sections.
27.30.+t - .
24.10.-i - Nuclear-reaction models and methods.
© Società Italiana di Fisica, Springer-Verlag 2001