Abstract
The rate of the to transition in () is compared to the analog transitions in () and () to provide constraints on ab initio calculations using realistic nuclear forces. The relevant state in , at MeV, is particle unbound. Therefore, a determination of the electromagnetic transition rate requires a precise and accurate determination of the width of the state, as well as the -particle and -ray branching ratios. Previous measurements of the -particle branching ratio are just barely in agreement. We report on a new study of the -particle branch by studying the reaction in inverse kinematics with the HELIOS spectrometer. The -particle branching ratio that we observe, , is in good agreement with the evaluated value and improves the associated uncertainty. The resulting experimental value is and is more consistent with a flat trend across the triplet than previously reported. This is inconsistent with Green's function Monte Carlo predictions using realistic three-nucleon Hamiltonians, which overpredict the value in and .
1 More- Received 28 August 2017
DOI:https://doi.org/10.1103/PhysRevC.96.041301
©2017 American Physical Society