Cascade γ Decay of the 187W Compound State

Experimental estimates on radiative strength function of low-energy ?-quanta following even-odd heavy nuclei decay

“…It may be, for instance, the dependence of the partial widths on the structure of the levels connected by these transitions. This dependence was clearly observed, for example, in [19,20,34].…”

“…Measurements of two-step y-ray cascades following thermal neutron capture, which were carried out in Dubna over the last ten years, have yielded some additional information on the intensities of primary ?-transitions in a relatively wide range of excitation energies [9][10][11][12][13][14][15][16][17][18][19][20][21][22], including the region above 3 MeV [14]. By now there have been accumulated data on 15 nuclei, mainly in the region of rare-earth nuclei (i. e. the region of the 4 S-maximum neutron strength function).…”

Dipole photon strength functions from neutron induced reactions

“…6. Total γ-ray spectra: experiment -solid lines, calculations -dashed ones During last two decades a lot of new information for primary dipole PSF was obtained via studying of two step gamma cascades (TSCs) by Sukhovoi (Dubna) [3,4] and Bečář (Prague) [5,6] groups. These relatively "simple" experiments need very cumbersome and sophisticated analysis for extraction of phenomenological PSFs .The results of both groups obtained in framework of different data analysis methods are different too.…”

“…In many cases it is possible to study gamma-decay of individual excited (compound) induced reaction (n,γ) provides very detailed information on photon strength functions (PSF) with E γ nuclear states with known Jπ values leading to final states with very limited range of Jπ quantum numbers. In addition study of two-step (n, γα)-reaction [1,2] and (n, γγ)-decay [3][4][5][6] gives unique possibility to extract the information on PSF for γ-transitions between excited nuclear states important for verification of theoretical models and many practical applications. During last decade very useful the results on the sum of mainly dipole PSF were obtained with aid of two step reactions ( where and are quasi-particle-phonon basic functions, the principal and small components respectively.…”

Main parameters of the 118Sn compound-state cascade γ-decay

“…1) is extracted [2] from the mass of γ − γ coincidences by means of the sum coincidence method. It contains some number of pairs of narrow enough [3] full-energy peaks corresponding to intense two-step cascades and a "noise line" with zero mean value formed by a number of low-intense cascades.…”