“…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.…”
The delayed neutron emission probability (P,) has been measured for 79 -83Ga ' 87 -89Br ' 92-96Rb ' 127-1321n ' 134, 135Sb ' 137-139i, and a,l -145Cs by means of sources produced at the OSIRIS isotope separator at Studsvik. The half-life determinations of 127,129,132in have been improved.Radioactivity 79-83Ga, 87-89Br ' 92-96Rb ' t27-13eln ' 134-135Sb ' 137-1391 and 141-145Cs ; measured delayed neutrons and //-activity; deduced delayed neutron emission probabilities and half-lives.
“…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.…”
The delayed neutron emission probability (P,) has been measured for 79 -83Ga ' 87 -89Br ' 92-96Rb ' 127-1321n ' 134, 135Sb ' 137-139i, and a,l -145Cs by means of sources produced at the OSIRIS isotope separator at Studsvik. The half-life determinations of 127,129,132in have been improved.Radioactivity 79-83Ga, 87-89Br ' 92-96Rb ' t27-13eln ' 134-135Sb ' 137-1391 and 141-145Cs ; measured delayed neutrons and //-activity; deduced delayed neutron emission probabilities and half-lives.
“…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.…”
Section: Discussion Of the Pn Resultsmentioning
confidence: 98%
“…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.…”
A detailed study of the β-delayed neutron emission properties of 137,138 I and 144,145 Cs has been performed by confining ions in the Beta-decay Paul Trap. The daughter ions following β decay emerge from the trapped-ion cloud with negligible scattering allowing reconstruction of the recoilion energy from the time-of-flight. From this information, the neutron-emission branching ratios and neutron-energy spectra were deduced. The results for the 137 I and 144,145 Cs decays are in agreement with previous results performed using direct neutron-detection techniques. In the case of 138 I, a branching ratio of 6.18(50)% is obtained, yielding a value consistent with the more recent results which are a factor of two larger than measurements made prior to 1978.
“…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.…”
The delayed neutron emission probabilities of 89'9~ and 139, 140,1411 have been measured. The ions A1Br + and AII+ are formed in the OSIRIS integrated target-ion source giving improved conditions for study of the most neutron-rich isotopes of iodine and bromine. The half-life determinations of 9~ 139I and 141I have been improved.Radioactivity s9 -91Br and 139-141i; measured delayed neutrons and /3-activity; deduced delayed neutron emission probabilities and half-lives
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