The elastic scattering 7Be + p at low energies: implications on the 7Be(p, γ)8Be S-factor

Angulo, C.; Descouvemont, Pierre; Cogneau, M.; Couder, M.; Gaelens, M.; Leleux, Pierre; Loiselet, M.; Ryckewaert, G.; Tăbăcaru, G.; Vanderbist, F.; Davinson, T.; Azzouz, M.; Baye, Daniel Jean; Pietro, A. Di; Figuera, P.; Pizzone, R. G.; Santos, F. de Oliveira; Séréville, N. de

doi:10.1016/s0375-9474(03)00936-9

Cited by 6 publications

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“…Properties of mirror nuclei 8 Li and 8 B have been intensively investigated in microscopic [5][6][7][8][9][10][11][12][13][14] and semimicroscopic models [15][16][17][18][19]. In addition, different experimental methods [20][21][22][23][24][25][26][27][28][29][30] were used to determine the structures of 8 Li and 8 and nuclear reactions in these nuclei. In particular, new resonance states of 8 B have been recently discovered in [24,28] in the elastic 7 Be + p scattering.…”

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confidence: 99%

Microscopic Description of 8Li and 8B Nuclei within a Three-Cluster Model

2017

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The theoretical analysis of structures of the bound and resonance states in 8 Li and 8 B nuclei is performed within a three-cluster microscopic model. In the framework of this model, 8 Li and 8 B nuclei are considered as three-cluster configurations 4 + 3 + and 4 + 3 + , respectively. A distinguished peculiarity of the model is that it allows us to consider the polarizability of weakly bound nuclei such as 7 Li composed of an alpha particle and a triton or 7 Be composed of an alpha particle and 3 He. Gaussian and oscillator bases are used to expand the three-cluster wave function and to represent the many-channel Schrödinger equation in a matrix form. The main attention of the present study is paid to the effects of cluster polarization on the spectrum of bound and resonance states of 8 Li and 8 B and on the elastic and inelastic + 7 and + 7 scattering. It is shown that the cluster polarization has a great impact on parameters of the bound and resonance states in 8 Li and 8 B. For instance, it decreases the energy of resonance states by 0.7-2.0 MeV and increases their lifetime by more than three times. The roles of spin-orbital and Coulomb interactions in the formation of the spectrum of excited states in nuclei 8 Li and 8 B are studied in detail. In particular, it is found out that the Coulomb forces shift up the energy of resonance states in 8 B with respect to the position of corresponding resonance states in 8 Li and increases their widths.

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