Abstract
The energy levels in up to an excitation energy of 6 Mev have been investigated by means of the reaction at an energy of 2 Mev for the incident ions. Selection and identification of the outgoing protons in the presence of deuterons, tritons, and alpha particles emitted in competing reactions is achieved with a proportional counter-CsI(Tl) scintillation counter telescope system which gives a measure of the and of the emitted particle. From the observed energy spectrum of protons emitted at 90°, the -value of the reaction leading to the ground state of was determined to be 5.97±0.05 Mev in agreement with a previous measurement by Norbeck, and the energy of excitation of the first four levels in were determined to be 3.70±0.05 Mev, 4.16±0.05 Mev, 5.05±0.08 Mev, and 5.5±0.1 Mev. At 90° in the laboratory system the relative intensities of the proton groups leading to the ground state and first four excited states are in the ratios of 1.0:2.6:0.8:1.6:1.0, respectively.
- Received 20 July 1959
DOI:https://doi.org/10.1103/PhysRev.116.1583
©1959 American Physical Society