Probability of delayed neutron emission from halogens

Delayed neutron emission probabilities of gallium, bromine, rubidium, indium, antimony, iodine, and cesium precursors

“…For 87Br and 88Br our results agree within limits of error with published /',-values. For 89Br we find a P,-value about twice the value reported by Aron et al [12]. It agrees well with more recent determinations, however.…”

β -delayed neutron emission studies of I137,138 and CsCzeszumska1, Scielzo2, Caldwell3 et al. 2020Phys. Rev. C6020View full textAdd to dashboardCite

“…In each case, the results agree well with the values recommended by the IAEA which are an evaluated world average of the previous measurements. The results for 138 I are of particular interest as the most recent measurements [18,21] indicated the P n is a factor of two larger than the results obtained from earlier measurements [22,23]. As a result, the IAEA evaluation had been based solely on the two most recent results, leading them to warn this standard should be used with caution.…”

“…For the decay of 138 I, however, the most recent measurements yielded branching ratios of 5.56( 22)% [18] and 5.32(20)% [21], respectively, which are a factor of two larger than the measurements performed prior to 1978 [22,23]. Additional results, especially from a measurement technique with a different set of systematic effects, were therefore desired to shed light on this discrepancy.…”

Delayed neutron emission probabilities of the precursors89,90,91Br and139,140,141I

“…The P.-values obtained are presented in Table 1 and compared to values reported in the literature [5][6][7][8] (P,-values based on estimated fission yields are omitted). The relative importance of systematic errors is also given and includes the uncertainty in the /3efficiency (5 ~), the uncertainty in the neutron counting efficiency arising from the error of the calibration procedure (3 %), and from that of the average neutron energy.…”