THE MG-24(HE-3,T)AL-24 REACTION AND L = 1 GIANT-RESONANCE SYSTEMATICS USING AN EFFECTIVE HE-3-N INTERACTION AT 27MEV NUCLEON

Differential cross sections from the Mg-24(He-3,t)Al-24 reaction have been measured from 0 to 32-degrees in the laboratory system. DWBA calculations using an effective projectile-nucleon interaction are compared with the data to verify the applicability of such an approach as well as to deduce spectroscopic information. By employing DWBA in conjunction with transition amplitudes obtained from realistic microscopic wave functions, J-pi assignments could be made. Strength normalizations for all observed transitions to positive-parity T = 1 final states of Al-24 are given.

Localized DELTA-L = 1 strength around 10 MeV in excitation energy contains most of the expected isovector giant dipole resonance (GDR) and the magnetic quadrupole resonance (MQR) strengths with systematics that are consistent with those for most light, self-conjugate nuclei. A comparison with Coulomb-energy shifted (gamma, n) data assists in locating the GDR analog. The isovector 0- strength is not directly observed, but the total expected DELTA-L = 1, DELTA-S = 1 cross section is found in the broad collective "bump" at about 10 MeV and in a number of lower-lying states of negative parity.