Abstract
The probability of 5He particle emission has been affirmedtheoretically [J.S. Zhang, Science in China G47 (2004) 137].In order to describe the 5He emission, thetheoretical formula of the double-differential cross sectionof emitted 5He is to be established. Based on the pick-up mechanism,used for calculating the formula of d, t, 3He, αemissions, the theoretical formula of double-differential crosssection of 5He is obtained, which is expressed in the form ofLegendre coefficients. In the case of low incident energies,the configuration [J.S. Zhang, Science in China G47 (2004) 137;J.S. Zhang, Commun. Theor. Phys. (Beijing, China)39 (2003) 83] is the dominant part in the reactionprocesses. The calculated result indicates that the forward peakedangular distribution of the composite particle emission is weakerthan that of the emitted single nucleon due to pick-up nucleonfrom the Fermi sea. As an example, the reactions of n+14N havebeen calculated, and the Legendre coefficients of d, t, 3He,α, 5He emissions are obtained respectively. The resultsshow that the forward tendency is decided by the average momentum pernucleon in the emitted composite particles. The larger the averagemomentum is, the stronger the forward tendency is.
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