Energies of Some 25Al Levels from the 24Mg(p,γ)25Al Reaction and the Coulomb-Energy Differences of Analog Rotational Bands

Abstract

Gamma rays from the 24Mg(p, γ)25Al reaction at the 1201 and 1485 keV resonances were measured with a 20 cm3 Ge(Li) detector. Excitation energies obtained for known levels in 25Al are (in keV): 1612.5 ± 0.5, 1789.6 ± 1.3, 3424.3 ± 0.6, and 3696.3 ± 1.1. By using the known 1201.4 ± 1.0 keV resonance energy, a more precise Q value of 2271.4 ± 1.2 keV is obtained, 16 keV lower than the previous value which had a 6 keV uncertainty.A brief discussion of the Coulomb-energy differences of 25Al and 25Mg analog rotational bands in relation to the 24Mg ground-state band is given and compared with the situation at mass number A = 21.