Precision measurements of gamma-ray energies up to 2 MeV using a 2 m curved-crystal monochromator

Abstract

Precision measurements of gamma-ray energies up to 2 MeV were performed using a 2m curved-crystal monochromator. Effectwe source activities of less than 40 mCur were used for the measurements of the transitions in the 2 MeV region. In the 150 keV region, effectxve source actwltles of less than 200 #Cur may be used. Measurements have been performed on the transitions of energies less than 2150 keV which follow the decay of In11~(54 mm), Mn 5n (2.6 h) and Sc 46 (85 d). In addition, results are presented which indicate that the reflection coefficient is approximately hnear with respect to wavelength for the second order reflection from the germanium ( 022) planes m the region of 6-90 m~_ (2000-135 keV). E I RADIOACTIVITY '~Sc, 56Mn, lX6In [from '~Sc, 55Mn, 1151n(n, 7)], I measured E~, I s Natural targets.

The level scheme of 171Tm

“…The curved-crystal spectrometer energy measurements reported in this paper were taken on The University of Michigan 2 m curved-crystal spectrometer utilizing the Ge(022) planes as diffraction planes. This spectrometer and the experimental techniques associated with it have been described previously [16][17][18]. Each curved-crystal spectrometer source was an Er203-epoxy mixture irradiated for approximately 24 h in The University of Michigan Ford Nuclear Reactor (thermal neutron flux ~ 3 × 1013 neutrons/see • cm2).…”

The decay of 160Tb to levels in 160Dy

“…The University of Michigan curved-crystal spectrometer and the experimental techniques associated with it have been described previously [24][25][26]. The curvedcrystal spectrometer source was a Tb203-epoxy mixture irradiated for a period of eight months in the University of Michigan Ford Nuclear Reactor (thermal neutron flux ~ 3 x 1013 neutrons/cm 2 • see).…”

Energy Levels ofFe56

“…6 where they are compared with the levels observed in the present work and in the 56 Mn decay. 2, 28 Recent inelastic-scattering experiments with protons, 29,30 neutrons, 31 and alpha particles 32 have yielded evidence for doublet levels at 3120 (3~~ or 4 + :l + ), 30,32 3450(1+:3+), 30 -32 and 3600[0+: (2)] 30,32 keV with spacings of 3, 3, and 6 keV, respectively. Neither of the levels at 3600 keV was observed in this work.…”