Abstract
Resonances just above the proton threshold in affect the reaction under astrophysical conditions. The (,)-reaction rate is currently determined indirectly and depends on the properties of the relevant resonances. We present here a method for finding the ratio between the proton and partial widths of resonances in . The widths are determined from the 2- and -decay of , which is produced at the ISOLDE radioactive ion beam facility at the European research organization CERN. Experimental limits on the ratio between the proton and partial widths for astrophysical relevant levels in have been found for the first time. A level at is identified in the spectrum, and an upper limit on the ratio of ( C.L.) is found. In the two-proton spectrum two levels at and are identified. These levels were previously seen to decay and upper limits on the ratio of and 9, respectively, ( C.L.) are found, where the latter differs from previous calculations.
- Received 11 March 2013
DOI:https://doi.org/10.1103/PhysRevC.87.055808
©2013 American Physical Society