1. In-beam gamma-ray spectroscopy at the proton dripline: 23Al
- Author
-
Gade, A., Adrich, P., Bazin, D., Bowen, M. D., Brown, B. A., Campbell, C. M., Cook, J. M., Glasmacher, T., Hosier, K., McDaniel, S., McGlinchery, D., Obertelli, A., Riley, L. A., Siwek, K., Tostevin, J. A., and Weisshaar, D.
- Subjects
Nuclear Experiment - Abstract
We report on the first in-beam $\gamma$-ray spectroscopy of \nuc{23}{Al} using two different reactions at intermediate beam energies: inelastic scattering off \nuc{9}{Be} and heavy-ion induced one-proton pickup, \nuc{9}{Be}(\nuc{22}{Mg},\nuc{23}{Al}$+\gamma$)X, at 75.1 MeV/nucleon. A $\gamma$-ray transition at 1616(8) keV -- exceeding the proton separation energy by 1494 keV -- was observed in both reactions. From shell model and proton decay calculations we argue that this $\gamma$-ray decay proceeds from the core-excited $7/2^+$ state to the $5/2^+$ ground state of \nuc{23}{Al}. The proposed nature of this state, $[\nuc{22}{Mg}(2^+_1) \otimes \pi d_{5/2}]_{7/2+}$, is consistent with the presence of a gamma-branch and with the population of this state in the two reactions., Comment: Physics Letters B, accepted
- Published
- 2008
- Full Text
- View/download PDF