Broad resonances and beta-decay

Abstract

Beta-decay into broad resonances gives a distorted lineshape in the observed energy spectrum. Part of the distortion arises from the phase space factor, but we show that the beta-decay matrix element may also contribute. Based on a schematic model for p-wave continuum neutron states it is argued that beta-decay directly to the continuum should be considered as a possible contributing mechanism in many decays close to the driplines. The signatures in R-matrix fits for such decays directly to continuum states are discussed and illustrated through an analysis of the beta-decay of ${}^8$B into $2^{+}$ states in ${}^8$Be.

27 pages, 5 figures

References in corpus (6)

• Big-Bang Nucleosynthesis
• Shell Structure of Exotic Nuclei
• Recent development of complex scaling method for many-body resonances and continua in light nuclei
• Nuclear Structure in the Framework of the Unitary Correlation Operator Method
• Muon capture on nuclei: random phase approximation evaluation versus data for 6 $\le$ Z $\le$ 94 nuclei
• 14Be(p,n)14B reaction at 69 MeV in inverse kinematics