Triple gamma ray directional correlation in ^1^5^4Gd

An experiment to measure the triple gamma ray directional correlation is described. One NaI(Tl) and two Ge(Li) detectors were employed under computer control. Total and accidental counts were accumulated simultaneously by use of two ADCs. The apparatus was used to study the 723-873-123 keV cascade f...
Ausführliche Beschreibung

An experiment to measure the triple gamma ray directional correlation is described. One NaI(Tl) and two Ge(Li) detectors were employed under computer control. Total and accidental counts were accumulated simultaneously by use of two ADCs. The apparatus was used to study the 723-873-123 keV cascade following the beta decay of ^1^5^4Eu. Procedures for determination of accidental coincidences, correction for finite detector solid angle, and correction for attenuation of the correlation due to the finite lifetime of an excited state differ from double correlation procedures. Double correlation studies were also made to confirm the consistency of the measurements and to determine the attenuation factors for the radioactive source employed here. Results that were both internally consistent and in accordance with prior studies of this decay were obtained, with δ(873) = -6.9 (+1.8, -3.4) on the basis of the triple correlation experiment; δ = -10.2+/-0.8 on the basis of supporting double correlation experiments. Ausführliche Beschreibung