Target isotope effect in high energy photon production atE/A=10 MeV - Pfaff, R.; Young, B. M.; Benenson, W.; Clayton, J.; Morrissey, D. J.; Orr, N. A.; Reposeur, T.; Thoennessen, M.; Winger, J. A. (Springer, 1993)
http://dx.doi.org/10.1007/BF01301279
Keywords: U