INTENSE TWO-STEP CASCADES AND

FIZIKA B 15 (2006)  4, 189-206

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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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