Role of 8Be heavy stripping mechanism in the α + 12C inelastic scattering to the near-3α-threshold states in 12C

• Published in: Physics of atomic nuclei Vol. 74; no. 11; pp. 1537 - 1542
• Main Authors: Belyaeva, T. L., Danilov, A. N., Demyanova, A. S., Goncharov, S. A., Ogloblin, A. A., Perez-Torres, R.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.11.2011
• Subjects: Nuclei; Particle and Nuclear Physics; Physics; Physics and Astronomy; Occupation Probability; Atomic Nucleus; Direct Transfer; Spectroscopic Factor; Inelastic Scattering
• ISSN: 1063-7788; 1562-692X
• DOI: 10.1134/S1063778811110032

The angular distributions of α + 12 C elastic and inelastic (to the 4.44 MeV, 2 + ; 7.65MeV, 0 + ; and 9.64MeV, 3 − states) scattering at 110 MeV are characterized by pronounced enhancement and strong oscillations at large angles. We performed calculations of the differential cross sections of these reactions assuming a potential scattering in the forward hemisphere and the direct transfer of 8 Be cluster θ c.m. > 90°. We showed that the α + 8 Be cluster configuration with relative angular momentum L = 0 dominates in the Hoyle state being 4.4 times larger than that in the ground state. This result also contributes to the verification of α BEC hypothesis and is consistent with the conjecture of a dilute 3 α structure of the Hoyle state. In the 9.64 MeV, 3 − state, a positive interference of all allowed α + 8 Be configurations with a dominance of the p -orbital (49%) α - 8 Be relative motion is found. This finding manifests the exotic 3 α , but hardly condensed structure of the 9.64-MeV 3 − state in 12 C.