Original scientific paper
Two-step cascades of the 187W compound nucleus γ-decay
Anatoly M. Sukhovoj
; Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
Valery A. Bondarenko
; Institute of Solid State Physics, University of Latvia, Riga, LV-1063, Latvia
Jaroslav Honzátko
; Research Centrum, CZ-25068 Rez near Prague, Czech Republic
Valery A. Khitrov
; Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
Ivo Tomandl
; Research Centrum, CZ-25068 Rez near Prague, Czech Republic
Abstract
Two-step cascades from the 186W(n,2γ) 187W reaction have been studied in the γ−γ coincidence experiment carried out in Reˇz. Their total intensity is evaluated with ˇ respect to the final level of cascades at ≈ 1.9 MeV. The processes of the cascade γ-decay of this nucleus, like of all nuclei previously studied in analogous experiments, can not be described without taking into account the influence of nuclear structure at energies lower than at least a half of the neutron-binding energy. The decay scheme of 187W, including 386 cascades, is determined up to the excitation energy ∼ 3 MeV. It contains data about 196 excited levels of this nucleus with the most probable spins 1/2 and 3/2. As in the earlier studied nuclei, the population of the intermediate levels by the most intense cascades may indicate a harmonic character of the states involved.
Keywords
186W(n; 2γ) 187W reaction; γ − γ coincidences
Hrčak ID:
304912
URI
Publication date:
2.11.2008.
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