Abstract
Delayed neutrons (DN) play an important role in nuclear reactor physics. In- novative critical reactor studies bring to light the need of new DN yields data. For the Th fuel cycle, according to the OECD recommendation, DN of the 232 Th is needed with an accuracy of 5%. In the literature, significant discrepancies were observed for energies be- low 4 MeV and data are dispersed around 14 MeV. Therefore, a programme has been un- dertaken by CEA in order to measure DN yields from 232 Th with incident neutron energies from 2 to 16 MeV. In this paper, the experimental setup will be described and preliminary results obtained at the PTB Ion Accelerator Facility of Braun- schweig for incident neutron beam energies of 2, 3, 4, 6, 7, 10 and 16 MeV will be pre- sented.
Highlights
Delayed neutrons (DN) play an important role in nuclear reactor physics
Delayed neutrons (DN) emitted after fission are of prime interest for several topics
With the development of reactors of new generation and/or new fuels, additional requirements appear in determining DN yields or to measure more accurately existing data
Summary
Delayed neutrons (DN) emitted after fission are of prime interest for several topics Among others, they allow the control of a nuclear reactor. Inside the recent ISTC project, results obtained between 3 and 5 MeV seem to indicate a quasi constant yield in this energy region which deviates from the energy dependence predicted by Yoshida et al [1]. These observations have motivated physicists of CEA (Commissariat al’energie atomique et aux energies alternatives) to undertake an experimental program for measurements of DN yields of 232Th for the incident neutron energy range from 2 MeV up to 16 MeV.
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