Abstract
The absolute and relative -decay strengths of the lowest levels in and are compared using the , , and reactions. By combining the present results with previous measurements, reduced asymmetries of , , ≤0.83 ± 0.29, and -0.04 ± 0.14 are obtained for the , , , and transitions, respectively. All of the known mirror transitions in mass 13 are summarized and compared with theoretical calculations and with the analogous decays of and . Upper limits of 2-7% are placed on the relative size of the isotensor transition matrix elements for the transitions. Changes in the radial wave functions induced by binding energy differences in and do not account for the observed asymmetry of the well known decays of the first excited states. This provides clear evidence of charge dependent parentage differences in the -allowed components of the nuclear wave functions. For the lowest levels in and we find , , eV, keV, and keV. A new efficiency calibration standard at MeV is provided by our measurement of the thick-target resonant yield, 's per incident proton.
[NUCLEAR REACTIONS , MeV resonance; , , particle- coincidence; measured and deduced and for () and (); symmetry of mirror transitions.]
- Received 21 March 1977
DOI:https://doi.org/10.1103/PhysRevC.16.61
©1977 American Physical Society