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FIZIKA B 9 (2000) 4, 147-168
 
A SEARCH FOR THE g-DECAY OF THE 168Er
COMPOUND NUCLEUS IN THE (n,2g) REACTION
EVGENY P. GRIGORIEVa, VALERY. A. KHITROVb,
ANATOLY. M. SUKHOVOJb and ELLA V. VASILIEVAb
aResearch Institute of Physics, St.-Peterburg State
University, Russia
bFrank Laboratory of Neutron Physics, Joint Institute for
Nuclear Research,
141980 Dubna, Russia
Received 28 May 1999; revised manuscript received 27 June 2000
Accepted 4 September 2000
The information derived from the spectra of two-step g-cascades
proceeding between the compound state of 168Er and its low-lying (Ef
< 1.1 MeV) levels is analysed. The data on the most intensive cascades resolved
experimentally were used to verify and make more precise the already known decay scheme of
this nucleus and to extend it to higher excitation energies. The degree of its
completeness was estimated numerically for a decay scheme of 91 levels with Eex
< 3.14 MeV. Total intensities of all cascades (including those unresolved
experimentally which form continuous parts of the experimental spectra) were used for
testing the models which attempt to explain and describe the cascade g-decay
process in the excitation energy diapason up to the neutron binding energy Bn.
PACS numbers: 25.40.LW, 27.70.+q
UDC 539.172.4
Keywords: 168Er compound state, two-step g-cascades,
low-lying (Ef < 1.1 MeV) levels, total intensities
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