Clustering effects in fusion evaporation reactions with light even-even N=Z nuclei. The ²⁴Mg and ²⁸Si cases

¹ Dipartimento di Fisica e Astronomia dell’Università and INFN, Sezione di Bologna, Bologna, Italy
² Dipartimento di Fisica dell’Università and INFN, sezione di Pavia, Pavia, Italy
³ CNRS, UMR6534, LPC, Caen, France and ENSICAEN, UMR6534, LPC, Caen, France
⁴ INFN, Laboratori Nazionali di Legnaro, Legnaro (Padova), Italy
⁵ University of Nevsehir, Science and Art Faculty, Physics Department, Nevsehir, Turkey
⁶ INFN, Sezione di Padova, Padova, Italy
⁷ Dipartimento di Fisica dell’Università and INFN, Sezione di Firenze, Firenze, Italy

^a e-mail: luca.morelli@bo.infn.it

Published online: 21 June 2016

Abstract

In the recent years, cluster structures have been evidenced in many ground and excited states of light nuclei [1, 2]. The decay of highly excited states of ²⁴Mg is studied in fusion evaporation events completely detected in charge in the reactions ¹²C+¹²C and ¹⁴N+¹⁰B at 95 and 80 MeV incident energy, respectively, and compared to the results of a pure statistical model [3, 4].

Inclusive variables are in general well reproduced by the model. We found clear deviations from the statistical model if we select emission channels involving multiple α particles which are more probable than expected from a purely statistical behavior. Data from ¹²C+¹²C reaction have been analyzed in order to study the decay of the Hoyle state of ¹²C* with two different selections: peripheral binary collisions and 6α decay channel in central events. To continue the investigation on light systems, we have recently measured the ¹⁶O+¹²C reaction at three different beam energies, namely E_beam = 90, 110 and 130 MeV. Preliminary results are presented.