|
FIZIKA B 17 (2008) 4, 463 - 480
 
TWO-STEP CASCADES OF THE 187W COMPOUND NUCLEUS g-DECAY
ANATOLY M. SUKHOVOJa, VALERY A. BONDARENKOb,
JAROSLAV HONZÁTKOc, VALERY A. KHITROVa and IVO TOMANDLc
aFrank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
bInstitute of Solid State Physics, University of Latvia, Riga, LV-1063, Latvia
cResearch Centrum, CZ-25068 Rez near Prague, Czech Republic
Received 30 April 2008; Accepted 15 October 2008
Online 4 March 2009
Two-step cascades from the 186W(n,2g)187W reaction have been studied in the g-g
coincidence experiment carried out in Rez. Their total intensity is evaluated
with respect to the final level of cascades at » 1.9 MeV. The processes of the cascade g-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.
PACS numbers: 25.40.LW, 27.70.+q
UDC 539.172.4
Keywords: 186W(n,2g)187W reaction, g-g coincidences,
|
