The 23Na(p, γ) 24Mg reaction and the giant dipole resonance in 24Mg

Abstract

The 23Na(p, γ) 24Mg reaction has been studied over the region of excitation corresponding to the giant dipole resonance. Gamma rays to the ground state and to the first and to the second plus third excited states have been observed. The (p, γ 0) cross section is on the average smaller than it is in other doubly even nuclei in this region. The (p, γ 1) cross section is considerably larger than the (p, γ 0) and clearly follows a giant-resonance shape. A part of the giant resonance built upon the second and/or third excited states is also observed. A fluctuation analysis finds the coherence width to be about 75 keV. The angular distributions of both γ 0 and γ 1 show the usual small energy variation that has come to be associated with the giant resonance.