Energy levels in Ge74 from the reaction Ge73 (n, γ) Ge74

Abstract

The level structure of Ge 74 has been investigated at the Karlsruhe research reactor using thermal neutron capture in ae 73. Neutrons were monochromized by Bragg reflection from a lead single crystal. The target was Gd 3 enriched to 86.1%. Precision measurements of the capture gamma-ray spectrum have been performed over the whole energy range by means of a 4 cm2X 0.5 cm lithium-drifted germanium detector. 148 gamma transitions have been observed. Considerable aid in analysis of the level structure is provided by double and triple coincidence measurements with 4"~ • 5" NaI(T1) detectors. Data were processed using the Karlsruhe Multiple Input Data Acquisition System (MIDAS). A level scheme of Gd 4 is proposed involving 38 excited states in the energy range from 0 to 4400 keV. The neutron binding energy of Ge 74 is determined to be 10202+ 10 keV.

A Study of the Reaction 73Ge(n, γ)74Ge

“…Magruder et al [20] Weitkamp et al [19] 290 f 2 Weitkamp et al [19] 1 1 0 1 2 1 1 1 0 6 k l 1 1 3 2 1 1 1 1 5 1 t 3 1 2 0 4 1 I [16]. This yields a ratio of reduced transiti0n:probabilities B(E2; 2: -2:)/B(E2; 2: -0+)=53.…”

The spin of the 2,198 keV level in74Ge and multipole mixing ratios of gamma transitions in the decay of74As

“…From decay considerations it is assigned as a 4 + and then it is considered as the third member of the two-phonon triplet. With respect to the 1,697 keV level, Chung et al [7] in their (n, y) work assigned it as a 2 + or 3 +. This level * Fellow of the Consejo Nacional de Investigaciones Cientificas y Y6cnicas, Argentina.…”

“…Data on these levels have also been taken in (n, 7) [7], (p, p') [8], (t, p) [9] and Coulomb excitation studies [10][11][12]. From the results of these experiments the level scheme of 74Ge populated by the decay of 74As shown in Fig.…”