Experimente zum Ablauf der Kernreaktion¹¹B(p, 3α) in der 675 keV-Resonanz

Abstract

In continuation of measurements at very low energies^1,2 the correlation in angle and energy of two of the emittedα-particles has been measured with standard coincidence technique at a proton energy of 675 keV (2⁻, level in¹²C at 16.57 MeV) by placing two surface-barrier-detectors in the plane perpendicular to the beam. The results are displayed in a Dalitz-diagramm, the pertinent formulae for conversion of laboratory system to c.m. system are given. The distribution of points in this plot shows that the decay from the reached level in¹²C proceeds only by sequential decay³. This confirms earlier results found at very low energies (130 keV and 250 keV) but differs from those found at a proton energy of 163 keV (2⁺, level in¹²C at 16.11 MeV).