Mechanism of the 12C(α,HI) reactions at Eα = 90 MeV

doi:10.1016/0375-9474(91)90504-Y

Nuclear Physics A

Volume 534, Issue 2, 18 November 1991, Pages 349-359

https://doi.org/10.1016/0375-9474(91)90504-Y Get rights and content

Abstract

Angular distributions of heavy ions leading to low-lying states of residual nuclei have been measured for the (α, HI) reactions (where $HI =^{6} Li,^{7} Li and^{7} Be$ ) using 90 MeV α-particles incident on a ¹²C target. Assuming that these reactions proceed through the direct pick-up of a few-nucleon cluster, the finite-range DWBA calculations have been carried out. Reasonable agreement between measured and calculated absolute cross sections was reached with the cluster spectroscopic amplitudes obtained on the basis of the shell model.

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Strong coupled-channel effects in the 9Be(3He,3He), 9Be(3He,7Be) and (3He,6Li) reactions at E(3He) = 60 MeV
1996, Nuclear Physics A
The angular distributions of the ⁹Be(³He,⁷Be)⁵He and ⁹Be(³He,⁶Li)⁶Li reactions were measured at the energy of 60 MeV for the transitions to the ground states of ⁵He and ⁶Li and 2.185 MeV (3⁺), 5.37 MeV (2⁺) + 5.65 MeV (1⁺) excited states of ⁶Li. The experimental data were analyzed using the coupled reaction channels (CRC) model including one- and two-step cluster transfers and cluster spectroscopic amplitudes calculated in the framework of the translation-invariant shell model. It was found that the coupling with inelastic channels and reorientation process modifies the elastic scattering cross section at large angles and allows one to describe the cross section satisfactorily. The cluster transfers are unimportant. The ⁹Be(³He,α)⁸Be reaction was included in the analysis to determine the optical potential of the intermediate $α +^{8} Be$ channel in two-step transfer. It was found that in the ⁹Be(³He,⁷Be)⁵He reaction the α-transfer dominates only at small angles while the transfer of the 2n-cluster at large angles. In the angular range $θ_{cm} ⋍ 30° – 80°$ the cross sections are determined by the sequential transfers of the neutron and ³He-cluster as well as deuteron and deuteron. The transitions to highly excited states of the intermediate ⁸Be and ⁷Li nuclei give large contributions to the cross sections. In the ⁹Be(³He,⁶Li)⁶Li reaction the t-cluster transfer dominates only for the transitions to the excited states of ⁶Li. The cross section for the transition to the ground state of ⁶Li is determined by the sequential transfer of the neutron and deuteron. Good agreement between measured and calculated cross sections was achieved.
Energy levels of light nuclei A = 16-17
1993, Nuclear Physics, Section A

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Nuclear Physics A

Abstract

References (18)

Kiev Institute for Nuclear Research report KIYal-87-35

Kiev Institute for Nuclear Research report KIYal-87-46

Phys. Rev.

Phys. Rev.

Phys. Rev.

Nuclear associations in atomic nuclei and many-nucleon transfer reactions

Ukr. Phys. J.

Structure of 1p-shell nuclei

Cited by (4)

Energy levels of light nuclei A = 8,9,10

Energy levels of light nuclei A = 5, 6, 7

Strong coupled-channel effects in the <sup>9</sup>Be(<sup>3</sup>He,<sup>3</sup>He), <sup>9</sup>Be(<sup>3</sup>He,<sup>7</sup>Be) and (<sup>3</sup>He,<sup>6</sup>Li) reactions at E(<sup>3</sup>He) = 60 MeV

Energy levels of light nuclei A = 16-17