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Gamma Rays from the Proton Bombardment ofMg24

Physical Review1956Vol. 102(1), pp. 208–222

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A.E. Litherland, E.B. Paul, G. A. Bartholomew, H. E. Gove

Abstract

The reactions ${\mathrm{Mg}}^{24}(p, \ensuremath{\gamma}){\mathrm{Al}}^{25}$, $Q=2.29$ Mev, and ${\mathrm{Mg}}^{24}(p, {p}^{\ensuremath{'}}\ensuremath{\gamma}){\mathrm{Mg}}^{24}$, $Q=\ensuremath{-}1.37$ Mev, have been measured for proton energies in the range 0.40 to 3.0 Mev. New levels in ${\mathrm{Al}}^{25}$ have been found at 1.61, 3.44, 4.90, 5.06, 5.10 Mev, and possibly at 5.09 Mev. Appropriate angular distribution measurements of proton-capture gamma rays and gamma rays from inelastic proton scattering, combined with previous measurements by other investigators, allow unambiguous spin and parity assignments to be made for all known levels in ${\mathrm{Al}}^{25}$ up to 4.7 Mev with the exception of those at 1.61, 2.51, and 3.44 Mev, where the assignments are less certain. The gamma-ray branching ratios for all the levels up to 4.7 Mev have been measured, as well as absolute values of the product of $\frac{{\ensuremath{\Gamma}}_{p}}{\ensuremath{\Gamma}}$ and the partial widths for primary gamma transitions and inelastic proton scattering for states above the proton binding energy. In several cases, intensity ratios of $E2\ensuremath{-}M1$ mixtures were obtained. An interpretation of some of the results based on a collective model of the ${\mathrm{Al}}^{25}$ nucleus is given.

Citations Over TimeTop 1% of 1956 papers

Abstract

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