FIZIKA B 12 (2003)  4, 299 - 309

TWO-STEP CASCADES FOLLOWING THERMAL NEUTRON CAPTURE IN ²⁷Al

JAROSLAV HONZÁTKO^a, VALERY A. KHITROV^b, ANATOLY M. SUKHOVOJ^b and IVO TOMANDL^a

^aNuclear Physics Institute, CZ-25068 Řež near Prague, Czech Republic
^bFrank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia

Received 20 March 2003; revised manuscript received 11 December 2003
Accepted 15 December 2003   Online 19 April 2004

Cascades of two successive g-transitions following thermal neutron capture in ²⁷Al have been studied. From g-g coincidences accumulated in the experiment, 13 intensity distributions of two-step cascades terminating at low-lying levels of ²⁸Al have been determined. From these spectra, the energies of g-transitions and intensities of 249 cascades populating 123 intermediate levels were derived. Energy dependence of intensity summed over the 0.5 MeV energy intervals for the cascades to two lower levels has also been determined.

PACS numbers: 25.40.LW, 27.30.+t
UDC 539.172.4

Keywords: thermal neutron capture in ²⁷Al, g-g cascade coincidences, 123 intermediate levels of ²⁸Al, energy dependence of intensity

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