Measurement of Absolute Fission Rates

Grundl, J.A.; Gilliam, David M.; Dudey, N.D.; Popek, R.J.

doi:10.13182/nt75-a24366

Cited by 77 publications

(27 citation statements)

References 11 publications

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“…The efficiency of the chambers were determined using 252 Cf sources of known activity, in the same configuration as the reference foils. These measurements gave a fission detection efficiency for both halves of the chambers (up-and downstream) that was consistent with the value reported by NIST [8]. A fission detection efficiency of 98.5% is taken as the fission detection efficiency for the NIST chambers and we have likewise used the same value.…”

Section: Fission Chamberssupporting

confidence: 64%

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Energy dependence of fission product yields from ²³⁵U, ²³⁸U, and ²³⁹Pu with monoenergetic neutrons between thermal and 14.8 MeV

et al. 2017

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Abstract. Under a joint collaboration between TUNL-LANL-LLNL, a set of absolute fission product yield measurements has been performed. The energy dependence of a number of cumulative fission product yields (FPY) have been measured using quasi-monoenergetic neutron beams for three actinide targets, 235 U, 238 U and 239 Pu, between 0.5 and 14.8 MeV. The FPYs were measured by a combination of fission counting using specially designed dual-fission chambers and γ -ray counting. Each dual-fission chamber is a back-to-back ionization chamber encasing an activation target in the center with thin deposits of the same target isotope in each chamber. This method allows for the direct measurement of the total number of fissions in the activation target with no reference to the fission cross-section, thus reducing uncertainties. γ -ray counting of the activation target was performed on well-shielded HPGe detectors over a period of two months post irradiation to properly identify fission products. Reported are absolute cumulative fission product yields for incident neutron energies of 0.5, 1.37, 2.4, 3.6, 4.6, 5.5, 7.5, 8.9 and 14.8 MeV. Preliminary results from thermal irradiations at the MIT research reactor will also be presented and compared to present data and evaluations.

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Section: Fission Chamberssupporting

confidence: 64%

“…The chambers were adopted from the design developed by Gilliam et al at NIST [8]. The two individual FCs are mirror images of each other (as shown in Fig.…”

Section: Fission Chambersmentioning

confidence: 99%

Energy dependence of fission product yields from ²³⁵U, ²³⁸U, and ²³⁹Pu with monoenergetic neutrons between thermal and 14.8 MeV

et al. 2017

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“…[2,3] and they are briefly summarized here. The dual-fission chamber was adopted from the design developed by Gilliam et al at NIST [5]. However, several design changes were made to facilitate the insertion and removal of the activation target contained between the two individual fission chambers (FCs).…”

Section: Experimental Procedure Analysis and Resultsmentioning

confidence: 99%

Fission product yield measurements using monoenergetic photon beams

2017

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Abstract. Measurements of fission products yields (FPYs) are an important source of information on the fission process. During the past couple of years, a TUNL-LANL-LLNL collaboration has provided data on the FPYs from quasi monoenergetic neutron-induced fission on 235 U, 238 U, and 239 Pu and has revealed an unexpected energy dependence of both asymmetric fission fragments at energies below 4 MeV. This peculiar FPY energy dependence was more pronounced in neutron-induced fission of 239 Pu. In an effort to understand and compare the effect of the incoming probe on the FPY distribution, we have carried out monoenergetic photon-induced fission experiments on the same 235 U, 238 U, and 239 Pu targets. Monoenergetic photon beams of E γ = 13.0 MeV were provided by the HIγ S facility, the world's most intense γ -ray source. In order to determine the total number of fission events, a dual-fission chamber was used during the irradiation. These irradiated samples were counted at the TUNL's low-background γ -ray counting facility using high efficient HPGe detectors over a period of 10 weeks. Here we report on our first ever photofission product yield measurements obtained with monoenegetic photon beams. These results are compared with neutron-induced FPY data.

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“…8. The experimental reaction cross sections were taken from EXFOR and checked against original publications [19][20][21][22][23][24][25][26][27] (they were not corrected for modern monitors or decay data). Some experimental data are spectral indices, i.e.…”

Section: Validation In the Reference Reactor Facilitiesmentioning

confidence: 99%

“…Some experimental data are spectral indices, i.e. reaction rate ratios measured relative to 235 U(n,f) [21,22,24], 238 U(n,f) [24] and 197 Au(n, ) [25]. The energy-averaged cross sections were computed using IRDFF-1.03 and facility spectra available in IRDF-2002 or one recalculated for ISNF.…”

Section: Validation In the Reference Reactor Facilitiesmentioning

confidence: 99%

Validation of IRDFF in²⁵²Cf Standard and IRDF-2002 Reference Neutron Fields

Simakov

Capote

Greenwood

et al. 2016

EPJ Web of Conferences

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Abstract.The results of validation of the latest release of International Reactor Dosimetry and Fusion File, IRDFF-1.03, in the standard 252 Cf(s.f.) and reference 235 U(n th ,f) neutron benchmark fields are presented. The spectrum-averaged cross sections were shown to confirm IRDFF-1.03 in the 252 Cf standard spontaneous fission spectrum; that was not the case for the current recommended spectra for 235 U(n th ,f). IRDFF was also validated in the spectra of the research reactor facilities ISNF, Sigma-Sigma and YAYOI, which are available in the IRDF-2002 collection. The ISNF facility was re-simulated to remove unphysical oscillations in the spectrum. IRDFF-1.03 was shown to reproduce reasonably well the spectrum-averaged data measured in these fields except for the case of YAYOI.

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Measurement of Absolute Fission Rates

Cited by 77 publications

References 11 publications

Energy dependence of fission product yields from ²³⁵U, ²³⁸U, and ²³⁹Pu with monoenergetic neutrons between thermal and 14.8 MeV

Energy dependence of fission product yields from ²³⁵U, ²³⁸U, and ²³⁹Pu with monoenergetic neutrons between thermal and 14.8 MeV

Fission product yield measurements using monoenergetic photon beams

Validation of IRDFF in²⁵²Cf Standard and IRDF-2002 Reference Neutron Fields

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Measurement of Absolute Fission Rates

Cited by 77 publications

References 11 publications

Energy dependence of fission product yields from 235U, 238U, and 239Pu with monoenergetic neutrons between thermal and 14.8 MeV

Energy dependence of fission product yields from 235U, 238U, and 239Pu with monoenergetic neutrons between thermal and 14.8 MeV

Fission product yield measurements using monoenergetic photon beams

Validation of IRDFF in252Cf Standard and IRDF-2002 Reference Neutron Fields

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Energy dependence of fission product yields from ²³⁵U, ²³⁸U, and ²³⁹Pu with monoenergetic neutrons between thermal and 14.8 MeV

Energy dependence of fission product yields from ²³⁵U, ²³⁸U, and ²³⁹Pu with monoenergetic neutrons between thermal and 14.8 MeV

Validation of IRDFF in²⁵²Cf Standard and IRDF-2002 Reference Neutron Fields