出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The aim of this work is to study the b-delayed multiparticle break-up of the 5/2− state in 9Be
at 2.43 MeV excitation energy. This process is relevant as it has been proposed recently that
this level plays a role in the a(an,g)9Be reaction. This state breaks-up in 2a+n, and sequential
as well as direct ("democratic") decay have previously been considered. In our work energy
and direction of the two emitted a particles has been measured, while those of the neutron have
been reconstructed. The sequential decay is considered using the R-matrix formalism. For the
democratic decay the hyper-spherical harmonics functions are used. The different decay processes
are compared with the data using the Monte-Carlo method. Our preliminary results indicate that
the data is better described when democratic decay is assumed.
