Abstract
The 11B(p, 2 α) 4He reaction has been studied at a bombarding energy of 163 keV to complement the previous measurements at energies of a few MeV. Many two-parameter spectra have been taken, both around the 8Be ∗ recoil axes and at selected angles away from the recoil axes. Coplanar and non-coplanar cases for the three alpha particles have been studied. Analysis yields results similar to those found previously for the higher bombarding energies but in dis-agreement with the conclusions of Dehnhard. Strong sequential decay through the 8Be ∗ states has been observed with very little or no evidence for simultaneous three-alpha decay.
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