J. Physique Lett. 38, 421-425 (1977)
DOI: 10.1051/jphyslet:019770038021042100

On the existence of a second Jπ = 0+ resonance at high excitation energy in 24Mg and a possible mechanism for the occurrence of resonances in the (12C + 12C) system

F. Cocu, J. Uzureau, S. Plattard, J.M. Fieni, A. Michaudon, G.A. Keyworth, M. Cates et N. Cindro

Service de Physique Nucléaire, Centre d'Etudes de Bruyères-le-Châtel, B.P. n° 561, 92542 Montrouge Cedex, France

Abstract
Evidence for the existence of a second Jπ = 0 + resonance at high excitation energy in 24Mg (E x = 19.70 MeV) is shown from a study of the 12C( 12C, α)20Ne reaction at Ec.m. = 5.80 ± 0.05 MeV. Using this result and those obtained previously, a comparison is made with the resonances observed in the second well of the fission barrier of some actinides.

Résumé
L'existence d'une seconde résonance Jπ = 0+ à haute énergie d'excitation dans 24Mg (Ex = 19,70 MeV) est mise en évidence au cours d'une étude de la réaction 12C(12C, α)20Ne effectuée à E c.m. = 5,80 ± 0,05 MeV. Ce résultat ainsi que les résultats antérieurs nous amènent à établir une comparaison avec les résonances observées dans le second puits de la barrière de fission de certains actinides.

PACS
2110H - Nuclear spin, parity, and isobaric spin.
2110M - Nuclear level density and structure.
2430 - Resonance nuclear reactions and scattering.
2570D - Few nucleon transfers in heavy ion induced reactions.
2730 - Properties of nuclei with 20 <or= A <or= 38.

Key words
heavy ion nucleus reactions -- nuclear resonance reactions and scattering -- nuclear resonances -- nuclear spin and parity -- nuclei with mass number 20 to 38 -- second J sup pi =0 sup + resonance -- sup 24 Mg -- high excitation energy -- sup 12 C sup 12 C,alpha sup 20 Ne -- resonances -- fission barrier -- actinides