Elsevier

Nuclear Physics A

Volume 257, Issue 1, 26 January 1976, Pages 144-164
Nuclear Physics A

12C(12C, 8Be)16O angular distributions and excitation functions between 35 and 69 MeV bombarding energy

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Abstract

An array of eight detectors has been developed for identifying the particle unstable 8Be nucleus from nuclear reactions with high detection efficiency. Absolute cross sections have been measured for the reaction 12C(12C, 8Beg.s.)16O to the ground state and to several excited states in 16O. Excitation functions at seven angles from 15° to 45° (lab) in 5° steps have been measured for bombarding energies between E12C(lab) = 35 and 69 MeV. Excitation functions were obtained for the following states in the residual nucleus 16O which were found to be strongly populated: g.s.(0+); 6.1 MeV (0+, 3); 6.9 MeV (2+); 10.4 MeV (4+); 11.1 MeV (4+); 14.7 MeV (6+,…) and 16.3 MeV (6+,…). The energy range is covered in 250 keV (c.m.) steps; at certain energy ranges in 125 keV or 50keV steps. All excitation functions exhibit a strong energy dependence of the cross section; pronounced gross structures with superimposed fine structures, similar to those observed for 12C+12C elastic and inelastic scattering at these energies, are observed. At 19.3 MeV, where resonant structures were observed in the reactions 12C(12C, p)23Na, 12C(12C, n)23Mg and 12C(12C, d)22Na, no resonance is found for the reaction studied here. At 60, 61 and 63 MeV angular distributions have been measured in 1° and 2.5°(lab) angular steps. The excitation functions have been analyzed in terms of Ericson fluctuations and cross-correlation functions.

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Research work of K. A. Eberhard sponsored in part by US Energy Research and Development Administration, while at the Nuclear Physics Laboratory, University of Washington, Seattle, WA 98195.

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