Abstract
The gamma-ray yield from sodium was measured as a function of proton bombarding energy over the range 1.0 to 2.5 Mev using resolutions of 2.5 kev or better. In addition, the yield of particles produced by the reaction and leading to the ground state of the residual nucleus was measured for proton energies of 1.0 to 2.2 Mev, with a resolution of 10 kev. Fifty-two resonances were observed in all. The resulting average level spacing is 28 kev at a mean excitation energy of 13.5 Mev in the compound nucleus . The resonances vary in natural width from less than 0.3 kev to 50 kev. The energy spectra of the gamma rays from a number of resonances were investigated with a single-crystal NaI(Tl) scintillation spectrometer. The spectra consist mainly of two gamma rays, with energies of 0.45±0.01 and 1.63±0.02 Mev. These are interpreted as transitions from the first excited states of the residual nuclei formed by the reactions and , respectively.
- Received 8 April 1954
DOI:https://doi.org/10.1103/PhysRev.95.974
©1954 American Physical Society