Abstract
The neutron spectrum from was studied at 120° with respect to the beam of deuterons incident on a lithium metal target. The average deuteron energy in the target was 1.98 MeV. Up to an excitation of 9 MeV in , only the ground state and the first excited state are observed. The neutron group to the excited state has a peak corresponding to 3.1±0.1-MeV excitation in and a width of 1.75±0.1 MeV in the center-of-mass system; however, the interpretation of these numbers in terms of the level parameters is obscured by the presence of a continuum from three-body decay. The relative differential cross section for the neutron groups leaving in the ground state and in the first excited state was measured from 0 to 135° and normalized to an absolute value at 0° measured with a LiF target. The cross section for the production of in the first excited state has some uncertainty because of the contribution from the competing three-body breakup of the compound system. Cross sections at 0° for are also given for reactions leaving in the ground state and first excited state.
- Received 28 October 1963
DOI:https://doi.org/10.1103/PhysRev.133.B1183
©1964 American Physical Society