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INTENSE TWO-STEP CASCADES AND
FIZIKA B 15 (2006) 4, 189-206
 
INTENSE TWO-STEP CASCADES AND g-DECAY SCHEME OF
THE 118Sn COMPOUND NUCLEUS
JAROSLAV HONZÁTKOa, VALERY A. KHITROVb, CVETAN
PANTELEEVb, ANATOLY M. SUKHOVOJb and IVO TOMANDLa
aNuclear Physics Institute, CZ-25068 Rez near Prague, Czech Republic
bFrank Laboratory of Neutron Physics, Joint Institute for Nuclear
Research,
141980 Dubna, Russia
Received 10 February 2005; Revised manuscript received 5 December 2006
Accepted 13 December 2006 Online 23 February 2007
Transition energies and intensities of 453 two-step cascades following
thermal neutron capture in 117Sn have been measured. The data allowed
us to considerably extend previous decay scheme of the 118Sn nucleus
and to achieve more precise results. Autocorrelation analysis of the excitation
spectrum of intermediate levels of the most intense cascades allowed us to
determine most probable period of their regularity. Besides, analysis showed the
impossibility to reproduce quantitatively the total cascade intensities taking
into account only excitations of the fermion type. The results lead to the
conclusion that the excitations of vibrational type considerably influence the
cascade
g-decay process in 118Sn almost up to the
neutron separation energy Sn.
PACS numbers: 25.40.LW, 27.60.+j
UDC 539.172.4
Keywords: thermal neutron capture in 117Sn, two-step cascades,
decay scheme of 118Sn nucleus
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