Experimental arguments in favor of refining model ideas of the cascade gamma decay of a compound state of a complex nucleus

Autor:	Li Chol, V. A. Khitrov, A. M. Sukhovoj
Rok vydání:	2005
Předmět:	Physics Nuclear physics Nuclear and High Energy Physics Dipole Phase transition Cascade Phonon Quantum mechanics Excited state Quasiparticle Radiative transfer Gamma ray Atomic and Molecular Physics and Optics
Zdroj:	Physics of Atomic Nuclei. 68:1510-1524
ISSN:	1562-692X 1063-7788
DOI:	10.1134/1.2053334
Popis:	An analysis of the entire body of data on the intensities of two-step gamma cascades studied in thermal-neutron capture for more than 50 nuclei from the range 27 ≤ A ≤ 199 suggests that such processes should be described in terms of model concepts that are much more involved than those currently adopted by experimentalists. According to the results of this analysis, models of relevant parameters, such as the density of excited levels and radiative strength functions for dipole gamma transitions, should take into account more explicitly the coexistence and interaction of quasiparticle and phonon interactions. A direct inclusion of the idea that a second-order phase transition occurs and affects not only level densities but also radiative strength functions for dipole transitions may prove to be necessary. These conclusions concern primarily the excitation-energy region below a value of about 0.5Bn.
Databáze:	OpenAIRE
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