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

10th International Conference on Clustering Aspects of Nuclear Structure and Dynamics

Benjamim, E.A.^1 ; Lépine-Szily, A.^1 ; Oliveira Jr., J.M.^1,3 ; Villari, A.C.C.^1,4 ; Lichtenthäler, R.^1 ; Chamon, L.C.^1 ; Guimarães, V.^1 ; Sciani, W.^2 ; Kuramoto, R.Y.R.^1,5 ; Alcantara, J.A.^1 ; Barioni, A.^1,6 ; Camargo Jr., O.^1 ; Denke, R.Z.^1 ; De Faria, P.N.^1 ; Lima, G.F.^1,7 ; Mendes Jr., D.R.^1,8 ; Pires, K.C.C.^1,9

Instituto de Fisica, Universidade de São Paulo, CP 66318, 05389-970, São Paulo, Brazil^1

Universidade Presbiteriana Mackenzie, Rua da Consolacão, 930, São Paulo, Brazil^2

Universidade de Sorocaba - UNISO Cidade Universitária, Rod. Raposo Tavares, KM 92.5, CEP-18023-000, Sorocaba SP, Brazil^3

Pantechnik S.A., 13 rue de la Résistance, 14400 Bayeux, France^4

Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes 2242, São Paulo, Brazil^5

Universidade Federal Da Bahia, Rua Barão de Jeremoabo, Ondina, Salvador, Brazil^6

Universidade Paulista - UNIP, Campus Alphaville, Av. Yojiro Takaoka, 3500, Santana de Parnaiba/SP, Brazil^7

Instituto de Fisica, Universidade Federal Fluminense, Campus Da Praia Vermelha, Boa Viagem, Niterói, RJ, Brazil^8

Universidade Tecnológica Federal Do Paraná, Av. Alberto Carazzai, 1640, Cornélio Procópio, Paraná, Brazil^9

关键词: Cluster structure;    Coulomb barrier;    Deformed band;    Doorway state;    Molecular band;    Nilsson model;    Rotational band;    Transfer reaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/436/1/012015/pdf
DOI  :  10.1088/1742-6596/436/1/012015

来源: IOP

【 摘 要 】

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 the12C+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 with12C+28Si cluster structure in the composite nucleus40Ca. The excitation energies of these states indicate that they can be part of a rotational band in40Ca, together with similar states observed in the elastic scattering and α-transfer reactions of the16O+24Mg system. We propose that the presently observed, largely deformed molecular band corresponds to the hyper-deformed band in40Ca, which has been found in a new Nilsson-model-calculation, which predicts preference of the12C +28Si and16O +24Mg molecular structures, in accordance with our present results.