Observation of Fine Structure in Nuclear Level Densities andγ-Ray Strength Functions

Level density andγstrength function in162Dyfrom inelastic3Schiller1, Guttormsen2, Melby3 et al. 2000Phys. Rev. CSelf Cite183141View full textAdd to dashboardCite

“…By comparing the present data, which were obtained from the 162 Dy( 3 He, 3 He'γ) 162 Dy reaction, to previous data [22,8], which were obtained from the 163 Dy( 3 He,αγ) 162 Dy reaction, we can test if the basic assumption of our analysis method is fulfilled.…”

“…However since data are very sparse and the absolute normalization of γ strength function data is very uncertain, we give the γ energy dependent factor in arbitrary units. [5,22,7] using approximate extraction methods, and in [8] in the present form, data from the first reaction are shown here for the first time. Figure 6 shows the relative level densities, which are calculated by dividing the extracted level densities by an exponential C exp(E/T ) with T = 580 keV and C = 10 MeV −1 in our case.…”

“…The F function from the 163 Dy( 3 He,αγ) 162 Dy reaction was already published in [22] using an approximate extraction method, however the data were reanalyzed using the exact extraction method of Ref. [6] and are in the present form, as well as data from the 162 Dy( 3 He, 3 He'γ) 162 Dy reaction, published for the first time in this work.…”

γ-ray cascade transitions in112Cd and114Cd following resonance capture of epithermal neutrons

“…The combined SLO and KMF (SLO-KMF) model can be written analytically for E γ in MeV as: Figure 11 shows a graphical representation of Eq. (9). A comparison of gated spectra simulated with the SLO-KMF model and measured from capture levels with J = 0 and 1 in 114 Cd is shown in Fig.…”

“…An important question is to what extent structures observed in photon-scattering experiments, such as "scissors mode" and "pygmy" dipole resonances, influence the γ-ray cascade transitions from particle-induced reactions. It has been observed in neutron-capture [8] and 3 He-scattering [9,10] experiments that the low-energy M 1 excitations in deformed nuclei (the scissors mode resonance) known previously from photon-and electron-scattering experiments [11] are needed to reproduce the γ-ray cascades correctly. The pygmy dipole resonance (PDR) is an E1 excitation mode superimposed on the GDR tail at energies below or around S n .…”