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Abstract

From the factorial moments of the probability distribution of neutron signal multiplets in signal and randomly triggered time intervals interpretation models are derived and tested for the assay of Pu containing fuel with fast neutron multiplication. Two different cases are considered. In the first model the spontaneous fission neutron emission rate of an unknown sample is determined relative to a well characterized standard. With the second model an absolute calibration of the Pu sample is performed knowing the instrumental parameters. The first model uses the measurement data of the autocorrelator called shift register or the factorial moments of neutron signal multiplets of order 0 and 1 for the signal triggered intervals and those of order 1 and 2 for the randomly triggered intervals of a signal multiplet analyser. The absolute calibration requires of both moment types the 3 moments of lowest order. In both interpretation models the effect of fast neutron multiplication is taken into account for a test sample based on the superreaction concept. These superevents are described by the probability that a neutron generates an induced fission event and nuclear data in form of the effective neutron multiplets emitted per spontaneous and induced fissions. Both models are used to determine the spontaneous fission rate from measured data. The achieved results are confronted with other interpretation models.

Additional information

Authors: HAGE W JRC ISPRA ESTAB. (ITALY) CIFARELLI D M UNIVERSITA L. BOCCONI, ISTITUTO DI METODI QUANTITATIVI, MILANO (ITALY) , JRC ISPRA ESTAB. (ITALY);UNIVERSITA L. BOCCONI, ISTITUTO DI METODI QUANTITATIVI, MILANO (ITALY)
Bibliographic Reference: INMM 25TH ANNUAL MEETING, ALBUQUERQUE (USA), JULY 22-25, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31957 ORA
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