Study of the 7.285-MeV Level in Lead-208 Using a Rotor Technique

Further Study of Nuclear Resonant Scattering Using Neutron-Capture Gamma Rays

“…The transition rates are 13% and 3%, respectively. 11 The ratio (4.3:1) of these two intensities in W 183 agrees fairly well with the ratios (5.9:1 and 3.4:1) for the corresponding transitions in Hf 179 and Hf 181 , respectively. The energy separation between the §~~ and f-levels in the (510) band of W 183 is 46 keV, which is close to the (44±3)-keV separation in Hf 179 and the (47±3)keV separation in Hf 181 .…”

“…11 However, these methods are only applicable to resonances having a separation of less than 15-20 eV between the gamma line and the level energy, and because of the good statistics required, such measurements have only been carried out for the relatively few cases where a very large scattered intensity is available. Four cases have been reported in the literature 2 ' 4,12,13 and the results do not permit any general conclusions to be drawn on the levelwidth distribution.…”

Resonance Fluorescence of Excited Nuclear Levels in the Energy Range 5-11 MEV

“…In addition the rotating target and double scattering methods were also used. Figure 7 shows the variation of the inten sity as a fu nction of the scatterer velocity, fo und by Arad et al (21 ), which permitted an independent determination of S. Figure 8 shows the variation of the intensity of the double-scattered beam with the angle of the primary scat tered 'Y line, obtained by Kapadia et al (23). The values of f o and 6 given in There are two values of 0, 4.8 and 5.0 eV, which are outside the 95% con fi dence intervals around the mean values, and one value of r, .…”

“…This resonance has been studied by several investigators (20)(21)(22)(23)33,39,(44)(45)(46) using various methods to determine the level parameters, and permits , SA -Self-absorption measurements.…”

Testing the lattice modes of NaCN by nuclear resonance photon scattering

“…For an infinitely thin 15 N sample, the scattering cross section σ r is given by the overlap integral between the Doppler broadened shapes of the incident γ line (described by a Gaussian) and the nuclear level (represented by a ψ function) [15,16]; it depends strongly on the effective temperatures T s , and T r (figure 1), through their Doppler widths. At 10 K and 295 K, the Doppler widths of the 6324 keV nuclear level are r1 = 12.2 eV and r2 = 14.8 eV (see figure 1), while that of the Cr γ source is s = 8.0 eV (corresponding to a temperature T ∼ 171 • C where T s = 467 K).…”