Decay of the 9.49-, 9.53-, and 9.60-MeV Levels ofO15

Abstract

The N 14 (^,T)0 15 reaction has been studied for proton energies of from 1.85 to 2.60 MeV. Principal resonances occur at 2.352±0.005 and 2.480±0.005 MeV, corresponding to levels in O 15 at 9.487 and 9.606 MeV. In addition, there is known to be a level of approximate width 300 keV at an energy of approximately 9.53 MeV. The decay of these levels has been studied using an anticoincidence-shielded Nal(Tl) spectrometer. Both of the sharp levels decay strongly to the ground state of O 15 , to the 5.24-MeV level, and weakly to the 6.18-MeV level. In addition, the 9.487-MeV level decays weakly to the 6.86-and 7.284-MeV levels. From the intensities and angular distributions of the ground-state transitions, it is concluded that the spin and parity of the 9.487-MeV level are f~ and that those of the 9.606-MeV level are §-. The broad 9.53-MeV level decays almost entirely to the ground state. A search for gamma radiation from the level in O 15 reported at 9.67 MeV was unfruitful. 1551047

Energy Levels and Electromagnetic Transitions inN15from theC13(Phillips1, Young2, Marion3 1967Phys. Rev.20000View full textAdd to dashboardCite

“…Above 9 MeV, theoretical work has been hampered, not only by the greater complexity of the shell-model configurations which become possible at higher energies, 3,5 but also by the previous lack of detailed experimental data concerning the bound states in N 15 above 9 MeV. Figure 1 shows the experimental energy levels [6][7][8][9][10] of N 15 and 0 15 and the first seven theoretical even-parity levels of Halbert and French. 3,4 Previous direct experimental observations of the energy levels in N 15 consist primarily of magneticspectrograph and electrostatic-deflection measurements from the N 14 (^)N 15 and C 13 (He 3 ,^)N 15 reactions.…”