Four $\alpha$-particles as a final state of $^{16}$O* Quasi Projectile decay

Maria Vittoria Managlia , Mauro Bruno , Michela d'Agostino , Luca Morelli , Giorgio Baiocco , Francesca Gulminelli (1) , Catalin Frosin , Sandro Barlini , Antonio Buccola , Alberto Camaiani , Giovanni Casini , Magda Cicerchia , Marco Cinausero , Daniela Fabris , Fabiana Gramegna , Giorgia Mantovani , Tommaso Marchi , Pietro Ottanelli , Gabriele Pasquali , Silvia Piantelli , Simone Valdré

1 LPCC - Laboratoire de physique corpusculaire de Caen

Four α-particles as a final state of 16O* quasi-projectile decayproduced in peripheral 16O+12C reactions at 130 MeV is thoroughly studied. The differentdecay channels leading to the four α-particles final state are reconstructed by carrying out an event-by-event analysis of α correlations in the population of intermediate 8Be and 12C. Although small, a non negligible contribution due to 8Begs evaporation is found.A comparison between predictions of an accurate Hauser-Feshbach decay code and branching ratios of the different decay channels is performed. Significant deviations are observed, among these the Hoyle state population which is considerably lower than the one predicted according to the statistical model, thus suggesting possible structure effects in the Coulomb barrier and/or in the transmission coefficients.

Domaines: Physique Nucléaire Théorique [nucl-th]

Maria Vittoria Managlia, Mauro Bruno, Michela d'Agostino, Luca Morelli, Giorgio Baiocco, et al.. Four $\alpha$-particles as a final state of $^{16}$O* Quasi Projectile decay. 4th International Conference on Nuclear Structure and Dynamics, May 2019, Venice, Italy. pp.01036, ⟨10.1051/epjconf/201922301036⟩. ⟨hal-02423716⟩