Representation of radiative strength functions within a practical model of cascade gamma decay
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CLEI Theory
Representation of Radiative Strength Functions within a Practical Model of Cascade Gamma Decay D. C. Vu1), 2)* , A. M. Sukhovoj1)** , L. V. Мitsyna1)*** , Sh. Zeinalov1)**** , N. Jovancevic3)***** , D. Knezevic3)****** , M. Krmar3)******* , and A. Dragic4)******** Received June 14, 2016; in final form, August 24, 2016
Abstract—A practical model developed at the Joint Institute for Nuclear Research (JINR, Dubna) in order to describe the cascade gamma decay of neutron resonances makes it possible to determine simultaneously, from an approximation of the intensities of two-step cascades, parameters of nuclear level densities and partial widths with respect to the emission of nuclear-reaction products. The number of the phenomenological ideas used is minimized in the model version considered in the present study. An analysis of new results confirms what was obtained earlier for the dependence of dynamics of the interaction of fermion and boson nuclear states on the nuclear shape. From the ratio of the level densities for excitations of the vibrational and quasiparticle types, it also follows that this interaction manifests itself in the region around the neutron binding energy and is probably different in nuclei that have different parities of nucleons. DOI: 10.1134/S1063778817020260
INTRODUCTION At any excitation energy, parameters of the cascade gamma decay of an arbitrary high-lying nuclear level are determined exclusively by the level density ρ and the partial widths Γ with respect to electric and magnetic dipole transitions. The intensity of cascades that involve purely quadrupole transitions is negligible at nuclear-excitation energies above several MeV units. For either parity, the spins of levels that are excited by primary transitions lie in the range of 2 ΔJ 4. Investigation of the gamma-decay process is of interest, first of all, for studying the dynamics of interaction of fermion and boson states 1)
Joint Institute for Nuclear Research, ul. Joliot-Curie 6, Dubna, Moscow oblast, 141980 Russia. 2) Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi, Viet Nam. 3) Department of Physics, Faculty of Sciences, University of ´ 3, 21000 Novi Sad, Novi Sad, Trg Dositeja Obradovica Republic of Serbia. 4) Institute of Physics Belgrade, Pregrevica 118, 11080 Zemun, Republic of Serbia. * E-mail: [email protected] ** E-mail: [email protected] *** E-mail: [email protected] **** E-mail: [email protected] ***** E-mail: [email protected] ****** E-mail: [email protected] ******* E-mail: [email protected] ******** E-mail: [email protected]
of nuclear matter. Reliable information on the subject is also necessary for more precisely describing the fission process. According to [1], the distribution of the energy between excited fission fragments depends on their level densities. However, the level densities calculated on the basis of existing models [2] deviate strongly from the most recent experimental data [3]. The reason behind this discrepancy ma
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