Interaction of 42 MeV α-particles with 3He

doi:10.1016/0375-9474(70)90685-8

Nuclear Physics A

Volume 143, Issue 1, 9 March 1970, Pages 121-129

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Abstract

The differential cross section for elastic scattering of 42 MeV α-particles from ³He has been measured between 20° and 160° c.m. A phenomenological description of the elastic scattering data is given by an optical-model calculation. To reproduce the shape of the differential cross section it was found that the absorptive potential was required to extend radially beyond the real potential. Including a small spin-orbit potential in the calculation improves the agreement with the experiment and predicts a polarization which is consistent with one measurement at a nearby energy. The reaction cross section given by the optical-model calculation is close to a lower limit estimated from integration of inelastic events observed.

The two-body reactions ³He(α, p)⁶Li ground and first excited state, were measured between 20° and 160° c.m. Optical potentials determined from elastic scattering data were used in a distorted wave Born approximation prediction for these cross sections. Qualitative agreement was obtained assuming only the ³He stripping mode.

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Alpha spectroscopic factors for 6Li, 7Li, 9Be and 12C from the (p→, pa) reaction at 296 MeV
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Three-body breakup cross sections and analyzing powers for the ⁶Li, ⁷Li, ⁹Be and $^{12} C (p,pα)$ reactions were measured at an incident energy of 296 MeV. Data were analyzed using the plane wave impulse approximation (PWIA) and the distorted wave impulse approximation (DWIA) and compared with previous studies. DWIA calculations reproduce shapes of projected spectra and analyzing power distributions fairly well with the exception of the $^{12} C (p,pα)^{8} Be$ reactions. Extracted spectroscopic factors for ⁶Li, ⁹Be and ¹²C are larger than those found in the previous studies. In contrast, extracted spectroscopic factors for ⁷Li agree with the previous work. This work suggests that the spectroscopic factor for ⁶Li is ∼ 0.8, independent of incident energies and reaction types.
One- and two-step processes in the 6Li(d,6Li), (d,7Li) and (d,7Be) reactions at E<inf>d</inf> = 50 MeV
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The cross sections for the (d,⁶Li), (d,⁷Li) and (d,⁷Be) reactions on the ⁶Li nuclei were measured at the deuteron energy of 50 MeV for transitions to the ground state of ⁶Li and to the ground and first excited states of ⁷Li and ⁷Be nuclei. The experimental data were analyzed with the coupled reaction channel model. It was found that both one- and two-step cluster transfers give substantial contributions to the cross sections. Reasonable agreement between measured and calculated cross sections was achieved. The asymmetry in the angular distributions between the (d,⁷Li) and (d,⁷Be) reactions was observed experimentally. We discuss the effects that lead to the charge symmetry violation.
Mass 2 and 3 cluster structure study with quasi-free reactions induced by 58 MeV protons on 9Be, 12C and 14N
1985, Nuclear Physics, Section A
Cross sections for (p, pd) and (p,p³He) reactions at 58 MeV have been measured for ⁹Be, ¹²C and ¹⁴N targets. An energy resolution of about 400 keV permitted identification of several excited states in the different residual nuclei. The experimental results are presented and analysed in the framework of the distorted-wave impulse approximation. Spectroscopic and mechanism information is discussed. Some additional quasi-free reactions involving t, ³He and α structure of ⁹Be have been observed and are also reported.
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Using a cluster model, the reaction ⁷Li(p, pt)⁴He has been analysed in the distorted-wave impulse approximation. All exchange terms arising from antisymmetrization of the target wave function have been calculated. When the correct asymptotic form for the intercluster wave function is used, the magnitude and shape of the measured angular correlation are reproduced both at 156 and 55 MeV. The analysis indicates that ⁷Li in its ground state is strongly clustered.

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Nuclear Physics A

Abstract

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Cited by (18)

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One- and two-step processes in the <sup>6</sup>Li(d,<sup>6</sup>Li), (d,<sup>7</sup>Li) and (d,<sup>7</sup>Be) reactions at E<inf>d</inf> = 50 MeV

Mass 2 and 3 cluster structure study with quasi-free reactions induced by 58 MeV protons on <sup>9</sup>Be, <sup>12</sup>C and <sup>14</sup>N

The elastic scattering of <sup>3</sup>He on <sup>4</sup>He at medium energies

On the <sup>7</sup>Li(p, pt)<sup>4</sup>He reaction