Cluster structures observed in 40Ca from 12C+ 28Si scattering

Benjamim E.A.; Lepine-Szily A.; Oliveira J.M.; Villari A.C.C.; Lichtenthaler R.; Chamon L.C.; Guimaraes V.; Sciani W.; Kuramoto R.Y.R.; Alcantara J.A.; Barioni A.; Camargo O.; Denke R.Z.; De Faria P.N.; Lima G.F.; Mendes D.R.; Pires K.C.C.

Cluster structures observed in 40Ca from 12C+ 28Si scattering

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Artigo de evento

Date

2013

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Journal of Physics: Conference Series

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3

Authors

Benjamim E.A.
Lepine-Szily A.
Oliveira J.M.
Villari A.C.C.
Lichtenthaler R.
Chamon L.C.
Guimaraes V.
Sciani W.
Kuramoto R.Y.R.
Alcantara J.A.
Barioni A.
Camargo O.
Denke R.Z.
De Faria P.N.
Lima G.F.
Mendes D.R.
Pires K.C.C.

Abstract

We discuss evidences of strong cluster structures observed in nuclear reactions even at quite high excitation energies. The oscillatory angular distributions of the elastic scattering of the 12C+28Si system measured at 13 energies close to the Coulomb barrier were reproduced introducing in the scattering S-matrix additional Regge-pole form terms. These poles were interpreted as describing doorway states with 12C+ 28Si cluster structure in the composite nucleus 40Ca. The excitation energies of these states indicate that they can be part of a rotational band in 40Ca, together with similar states observed in the elastic scattering and α-transfer reactions of the 16O+ 24Mg system. We propose that the presently observed, largely deformed molecular band corresponds to the hyper-deformed band in 40Ca, which has been found in a new Nilsson-model-calculation, which predicts preference of the 12C + 28Si and 16O + 24Mg molecular structures, in accordance with our present results.

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Cluster structure , Coulomb barrier , Deformed band , Doorway state , Energy , Molecular band , Rotational band , S-matrix , Si clusters , Transfer reaction