Abstract
The radioisotope is of great importance for understanding the chemical and dynamical evolution of our galaxy. Among the possible stellar sources, massive stars are believed to be the main producer of this radioisotope. Understanding nucleosynthesis in massive stars requires estimates of the thermonuclear reaction rates of the Mg, Na, and Mg reactions. These reaction rates depend on the spectroscopic properties of states above the neutron and alpha thresholds. In this context, the Al* reaction was studied at 18 MeV using a high-resolution Enge Split-Pole spectrometer. States from the ground state up to excitation energies of 14 MeV were populated. While up to the + threshold no additional states are observed, we report for the first time 30 new levels above the + threshold and more than 30 new states above the + n threshold for which excitation energies are determined with an uncertainty of 4–5 keV.
- Received 15 January 2014
- Revised 21 April 2014
DOI:https://doi.org/10.1103/PhysRevC.89.065805
©2014 American Physical Society