Elsevier

Nuclear Physics A

Volume 120, Issue 2, 18 November 1968, Pages 297-320
Nuclear Physics A

The 6Li(p, n)6Be and 7Li(p, n)7Be reactions at intermediate proton energies

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Abstract

The 6,7Li(p, n)6,7Be reactions were studied over the angular range 0° ≦ θ1ab ≦ 60° at both Ep = 30 and 50 MeV. In the case of 6Be, the ground state and two other states were observed at 1.63 ± 0.16 and 3.47 ± 0.30 MeV excitation, respectively. In 7Be, in addition to well-known states, two previously unobserved levels were observed at 11.7 ± 0.2 and 12.8 ± 0.2 MeV excitation. The highest and previously unobserved 6Be level is in good agreement with cluster-model calculations and some 6He data, therefore a further T = 1 state in 6Li is predicted. The angular distributions of the 6,7Beg.s. transitions were fairly well reproduced using a DWBA calculation with a microscopic interaction. A real macroscopic (t · T) potential successfully predicted the shape of the angular distribution for the 7Beg.s. transition at both energies, but an additional imaginary (t · T) component appeared to be required to give the correct cross-section magnitude at 30 MeV.

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    Now at Hebrew University, Jerusalem, Israel.

    ††

    Now at National Physical Laboratory, Teddington, England.

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