Low-Lying Energy States inNe20from theF19(d, n)Ne20Reaction

Abstract

Six neutron groups from the ${\mathrm{F}}^{19}(d, n){\mathrm{Ne}}^{20}$ reaction corresponding to the lowest states in ${\mathrm{Ne}}^{20}$ have been observed at six angles of observation. The major part of the experiment employed nuclear emulsions and an average deuteron energy of 3.57 Mev. The importance of stripping appears to depend on the particular level involved; in particular, angular distributions leading to unambiguous assignments by stripping theory appear only for the ground, 1.63-Mev, and 6.75-Mev levels. The ground-state assignment appears to be energy dependent when the present $l_p=2\mathrm{}$ value is compared to the $l_p=0\mathrm{}$ value previously reported for a higher bombarding energy. The 4.25-Mev level in ${\mathrm{Ne}}^{20}$ gives rise to an angular distribution which could be either $l_p=2\mathrm{}$ or $l_p=3\mathrm{}$, but the fit to theory is not satisfactory for either case. A qualitative argument is given favoring the latter value. No assignment can be made to the 4.97- and 5.63-Mev levels.