Puissance residuelle totale emise par les produits de fission thermique DE 235U

In this paper we present some new results concerning the β + γ residual power following the ²³⁵U thermal fission for cooling times going from 70 to 7 × 10⁴ s.

We give a brief description of the experimental technique and of the methods used to obtain the residual power from the measurements. Then we examine the different sources of errors. The residual power curves for three different irradiation times as well as a curve due to one fission (elementary fission curve) are given.

These experimental results are compared with other values coming from β and γ measurements and from theoretical calculations based on fission products systematics. For the considered cooling times the discrepancies between our experimental results and the theoretical calculations are less than 12% for cooling times <700 s and inside the experimental uncertainties for cooling times > 700 s.