Abstract
The β-delayed α-spectrum of has been measured at the TISOL facility at TRIUMF resolving the structure of a broad α-particle distribution at α-energies of 1.5–5.5 MeV into several states that show a distinct interference pattern. -matrix fits assuming a solely partial wave confirm this finding. The extrapolated low energy part of this structure constitutes the natural parity background in a possible experiment to observe the parity forbidden α-decay of the MeV, state in that is estimated from the fit to be of the intensity of the keV peak. In addition, the tails of the broad states observed likely contribute to the astrophysical () reaction rate though the experimental information available is too incomplete to allow precise predictions. The β-delayed α-spectrum of also excludes complex β-feeding amplitudes at a significant level. The states seen in the β-delayed α-decay produce a pattern of approximately equally spaced states in consistent with states seen at the same and higher excitation energies of .
- Received 23 June 2006
DOI:https://doi.org/10.1103/PhysRevC.75.012804
©2007 American Physical Society