[en] The information about the level density of ¹⁵⁶ Gd nucleus and strength functions of γ transitions extracted from two γ-cascade spectra of the ¹⁵⁵ Gd (n,2γ) ¹⁵⁶ Gd reaction is analyzed. The method of statistical simulation of γ-cascade intensity is applied for calculation of the main parameters of experimental spectra. The method is used to extract the information on the E1-radiative strength function of γ transitions and level density in the ¹⁵⁶ Gd nucleus. It is shown that at an excitation energy above 3 MeV the level density of ¹⁵⁶ Gd nucleus must decrease in comparison with that calculated within the Fermi gas model. Its is concluded that possible explanation of the observed effect is connected with the influence of pairing correlations on the level density in nuclei

[en] The method of increasing of resolution in coincidence spectra of different radiation is suggested. The new method is developed on the base of generalization of γγ-coincidence method with summing of energy of coincident quanta

[en] Short communication

[en] The information about the level density of ¹⁵⁶Gd nucleus and strength functions of γ-transitions is extracted from two γ-cascade spectra of the ¹⁵⁵Gd(n,γ)¹⁵⁶Gd reaction. It is shown that at an excitation energy above ∼3 MeV the level density of ¹⁵⁶Gd nucleus must decrease in comparison with that calculated within fermi-gas model. Possible explanation of the observed effect is connected with the influence of pairing correlations on the level density in nuclei. (author)

[en] The background structures remained in the differential spectra of two-quantum cascades after background subtraction by the method described in the preprint of the JINR P6-87-98 make difficult these spectra interpretation and reduce the SACP measurements energy interval. The idea of a two-step background subtraction is discussed. On the example of ¹⁷⁰Lu decay it was demonstrated that this new method of Compton background subtration results in full disappearance of these unwanted bachground structures. 3 refs.; 6 figs

[en] A method is proposed for seeking nonstatistical trends in the behavior of the radiative strength function of the primary γ transitions from the (n,γ) reaction. Existing data are used to analyze the correlations in the intensity of the primary transitions for the nuclei ¹⁷⁴Yb, ¹⁶⁸Er, and ¹⁷⁸Hf in the capture of thermal neutrons and in the capture of neutrons with an average energy E_n = 2 keV. The positive correlation coefficients found for ¹⁷⁴Yb and ¹⁶⁸Er are very strong evidence that the radiative strength functions for these nuclei differ significantly from the mean open-quotes statisticalclose quotes values. 20 refs., 6 figs., 1 tab

No abstract available

[en] There is a problem related to the choice of the level density input for Hauser-Feshbach model calculations. Modern computer codes have several options to choose from but it is not clear which of them has to be used in some particular cases. Availability of many options helps to describe existing experimental data but it creates problems when it comes to predictions. Traditionally, different level density systematics are based on experimental data from neutron resonance spacing which are available for a limited spin interval and one parity only. On the other hand reaction cross section calculations use the total level density. This can create large uncertainties when converting the neutron resonance spacing to the total level density that results in sizable uncertainties in cross section calculations. It is clear now that total level densities need to be studied experimentally in a systematic manner. Such information can be obtained only from spectra of compound nuclear reactions. The question is does level densities obtained from compound nuclear reactions keep the same regularities as level densities obtained from neutron resonances- Are they consistent- We measured level densities of ^59-64Ni isotopes from proton evaporation spectra of ^6,7Li induced reactions. Experimental data are presented. Conclusions of how level density depends on the neutron number and on the degree of proximity to the closed shell (⁵⁶Ni) are drawn. The level density parameters have been compared with parameters obtained from the analysis of neutron resonances and from model predictions

[en] The partial cross section for radiative neutron capture by ⁴⁸Ti nuclei was measured as a function of neutron energy. The method of neutron spectrometry used is based on the shift in the energy of the primary γ transition in response to a change in the energy of the captured neutron. The reaction ⁷Li(p, n)⁷Be was used as a neutron source. Protons were accelerated by a Van de Graaff electrostatic generator up to energies of 60 keV above the reaction threshold, which provided neutron energies in the range from 10 to 120 keV. The partial widths of some resonances were determined. The radiative strength functions of E1 and M1 transitions to the first excited state were calculated

[en] The cascade γ-decay of the ²⁰⁰Hg compound-state (J^π = 0^-) following thermal neutron capture was studied. In ²⁰⁰Hg, analogously to ¹⁹⁶Pt, the intensities of the two-step cascades to the 0⁺ final levels which most probably excite the 1⁺ intermediate levels exhibit the resonance character of the dependence on the excitation energy with a maximum at about 3.2 MeV. (author)