Pulse shape discrimination and energy response of calcium tungstate crystals

The scintillation response of calcium tungstate crystals to gamma rays, protons and alpha particles has been studied. It is shown that there is a difference in shape between gamma-ray and alpha-particle pulses, and that this effect may be exploited to discriminate between particles.Peer reviewed: YesNRC publication: Ye

The resolution correction in the scintillation spectrometry of continuous X rays

The problem of making resolution corrections in the scintillation spectrometry of continuous X rays is discussed. Analytical solutions are given to the integral equation which describes the effect of the statistical spread in pulse height. The practical necessity of making some kind of numerical analysis is pointed out. Difficulties with numerical methods arise from the fact that the observed pulse-height distribution cannot be defined precisely. As a result it is possible in practice only to find smooth "solutions". Additional difficulties arise if the numerical method is based on an invalid analytical procedure. For example matrix inversion is of doubtful value in making the resolution correction because there does not appear to be an inverse kernel for the integral equation in question.Peer reviewed: YesNRC publication: Ye

Absolute cross section of the K39(n,pp)A39 reaction for 2.5-MeV neutrons

The cross section for the K39(n, p)A39 reaction, at a neutron energy of 2.46 MeV, has been measured to be 96\ub16 mb. The experimental method consists of taking coincidences between the events in a KI(T1) scintillation crystal and the He2 particles which are produced simultaneously with neutrons in the d-d reaction.Peer reviewed: YesNRC publication: Ye

The Ge73(n, \u3b1)Zn70 reaction at 14 MeV observed in a lithium drifted germanium detector

The (n, \u3b1) reactions induced in germanium by 14 MeV neutrons have been observed in a germanium semiconductor detector. Values of the cross section of the ground-state transition of Ge73(n, \u3b1)Zn70 at 14.1 and 14.8 MeV are presented along with possible evidence for the existence of excited states of Zn70 at 1.95\ub10.1 MeV and at 2.3\ub10.1 MeV. Evidence for a reduced response of the detector to the Zn recoil atoms is discussed.Peer reviewed: YesNRC publication: Ye

Radiative width of the 6+ level in 20Ne at 8.78\u2002MeV

The radiative width of the 6+ resonance at E\u3b1\u2002=\u20025.06\u2002MeV in the 16O(\u3b1, \u3b3)20Ne reaction has been measured to be \u3c9\u3b3\u2002=\u20021.30\u2002\ub1\u20020.20\u2002eV corresponding to a transition strength of 20\u2002\ub1\u20023\u2002W.u. for the 6+ to 4+ transition in 20Ne. Comparison is made to rotational and shell model predictions.Peer reviewed: YesNRC publication: Ye