Parallel momentum distribution of the $^{28}$Si fragments from $^{29}$P
  Distribution of the parallel momentum of $^{28}$Si fragments from the breakup of 30.7 MeV/nucleon $^{29}$P has been measured on C targets. The distribution has the FWHM with the value of 110.5 $\pm$ 23.5 MeV/c which is consistent quantitatively with Galuber model calculation assuming by a valence proton in $^{29}$P. The density distribution is also predicted by Skyrme-Hartree-Fock calculation. Results show that there might exist the proton-skin structure in $^{29}$P. 
Y.B. Wei, Y. G. Ma, X. Z. Cai, C. Zhong, J. G. Chen, H. Y. Zhang, D.   Q. Fang, K. Wang, G.L. Ma, W. Guo, W. D. Tian, W. Q. ...