Elsevier

Nuclear Physics A

Volume 296, Issue 2, 20 February 1978, Pages 333-348
Nuclear Physics A

Fusion and neutron transfer cross sections for 9Be + 12C at sub-Coulomb energies

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Abstract

The energy dependence of the fusion cross section for 9Be + 12C has been measured over the range Ec.m. = 2.8–6.3 MeV by detecting γ-rays from the various possible residual nuclei with two large NaI(Tl) detectors placed close to the target. The single-neutron transfer reactions 9Be(12C, 13C)8Be leading to the 3.088 MeV (12+) and 3.854 MeV (52+) states of 13C were measured over the range Ec.m. = 1.0–5.8 MeV and 2.1–5.8 MeV, respectively by detecting the characteristic γ-rays with a Ge(Li) detector. The energy dependence of the 9Be(12C, 13C1)8Be transfer cross section was found, in the sub-Coulomb energy region, to be in good agreement with the simple calculation proposed by Switkowski et al. The fusion cross sections for 9Be + 12C are compared with the optical model calculations, using various parameter sets, and with experimental results for other light-nuclei systems. The fusion cross sections for 9Be + 12C, 12C + 13C and 9Be + 16O are found to be enhanced with respect to other systems at incident energies below the Coulomb barrier. It is suggested that a loosely bound neutron fosters, via polarisation, the fusion of the two nuclei at energies just below the Coulomb barrier.

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Present address: Foster Radiation Laboratory, McGill University, Montreal Quebec H3C 3G1.

††

Present address: Downstate Medical Center, State University of New York, Brooklyn, NY.

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