Study of Excited States inN15andN16

Abstract

A Buechner-type magnetic spectrograph has been used to study the following reactions: ${\mathrm{N}}^{14}\mathrm{}(d,p)\mathrm{}{\mathrm{N}}^{15}$ at 90° and 120° with respect to an incident deuteron beam of $E_d=4\mathrm{}$ MeV; ${\mathrm{C}}^{13}({\mathrm{He}}^3,p){\mathrm{N}}^{15}$ at 60°, 90°, and 120°, with $E_{{\mathrm{He}}^3}=4.0\mathrm{}$ MeV; and ${\mathrm{C}}^{14}({\mathrm{He}}^3,p){\mathrm{N}}^{16}$ at 60°, 90°, and 120° and at bombarding energies of 4.0 and 4.5 MeV. Thirteen proton groups have been observed corresponding to levels in ${\mathrm{N}}^{15}$ between 8 and 11 MeV. Recently reported ${\mathrm{N}}^{15}$ levels at 9.226, 9.763, and 9.929 MeV are confirmed, but no evidence is found for the ${\mathrm{N}}^{15}$ levels tentatively reported at 8.643, 8.739, and 9.598 MeV. In the reaction ${\mathrm{C}}^{14}({\mathrm{He}}^3,p){\mathrm{N}}^{16}$, 13 proton groups have been observed corresponding to the ground state and excited states of ${\mathrm{N}}^{16}$ up to 5.3 MeV. All of the ${\mathrm{N}}^{16}$ levels are in agreement with those reported previously by means of other reactions. However, no evidence is found for levels tentatively identified at 1.29, 1.737, and 2.150 MeV.