Evidence for the stochastic aspect of prompt<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>emission in spontaneous fission

Chyzh, A.; Wu, C. Y.; Kwan, E.; Henderson, R. A.; Gostic, J. M.; Bredeweg, T. A.; Haight, R. C.; Hayes-Sterbenz, Anna Catherine; Jändel, M.; O’Donnell, J. M.; Ullmann, J. L.

doi:10.1103/physrevc.85.021601

Cited by 55 publications

(104 citation statements)

References 10 publications

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“…The PPAC's entrance and exit windows are 13 µm thick Kapton foils. A similar PPAC design was used in several previous experiments conducted with DANCE including a 252 Cf spontaneous fission measurement [54] and the recent 242 Pu neutroncapture cross section measurement [51]. The PPAC was operated with ≈4 Torr of isobutane stabilized by a gashandling system, and it was biased up to ≈400 V. The typical pulse height for fission events is several hundred mV.…”

Section: Methodsmentioning

confidence: 99%

Measurement of theAm242mneutron-induced reaction cross sections

Buckner

Henderson

et al. 2017

Phys. Rev. C

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The neutron-induced reaction cross sections of 242m Am were measured at the Los Alamos Neutron Science Center using the Detector for Advanced Neutron-Capture Experiments array along with a compact parallel-plate avalanche counter for fission-fragment detection. A new neutron-capture cross section was determined, and the absolute scale was set according to a concurrent measurement of the well-known 242m Am(n,f) cross section. The (n,γ) cross section was measured from thermal to an incident energy of 1 eV at which point the data quality was limited by the reaction yield in the laboratory. Our new 242m Am fission cross section was normalized to ENDF/B-VII.1 to set the absolute scale, and it agreed well with the (n,f) cross section reported by Browne et al. from thermal energy to 1 keV. The average absolute capture-to-fission ratio was determined from thermal to En = 0.1 eV, and it was found to be 26(4)% as opposed to the ratio of 19% from the ENDF/B-VII.1 evaluation.

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Section: Methodsmentioning

confidence: 99%

Measurement of theAm242mneutron-induced reaction cross sections

Buckner

Henderson

et al. 2017

Phys. Rev. C

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“…Figure 13. Prompt fission γ-ray spectrum from the spontaneous fission from 252Cf [24] compared to the historical data of Verbinski et al [25] and recent measurements at LANL [26] (full black line). In Fig.…”

Section: Methodsmentioning

confidence: 99%

“…In Fig. 13 an example of the PFGS of 252 Cf(sf) is given and compared to the historical measurements of Verbinski et al [25] as well as to measurements using the DANCE detector at Los Alamos National Laboratory (LANL) [26] and the ENDF/B-VII evaluation. Compared to the literature data a more complex structure especially in the low γ-ray energy part is observed as given in the insert of Fig.…”

Section: Methodsmentioning

confidence: 99%

Fission cross-sections, prompt fission neutron and γ-ray emission in request for nuclear applications

Hambsch

Salvador-Castiñeira

Oberstedt

et al. 2016

EPJ Web of Conferences

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Abstract. In recent years JRC-IRMM has been investigating fission cross-sections of 240,242 Pu in the fast-neutron energy range relevant for innovative reactor systems and requested in the High Priority Request List (HPRL) of the OECD/Nuclear Energy Agency (NEA). In addition to that, prompt neutron multiplicities are being investigated for the major isotopes 235 U, 239 Pu in the neutron-resonance region using a newly developed scintillation detector array (SCINTIA) and an innovative modification of the Frisch-grid ionisation chamber for fission-fragment detection. These data are highly relevant for improved neutron data evaluation and requested by the OECD/Working Party on Evaluation Cooperation (WPEC). Thirdly, also prompt fission γ-ray emission is investigated using highly efficient lanthanide-halide detectors with superior timing resolution. Again, those data are requested in the HPRL for major actinides to solve open questions on an under-prediction of decay heat in nuclear reactors. The information on prompt fission neutron and γ-ray emission is crucial for benchmarking nuclear models to study the de-excitation process of neutron-rich fission fragments. Information on γ-ray emission probabilities is also useful in decommissioning exercises on damaged nuclear power plants like Fukushima Daiichi to which JRC-IRMM is contributing. The results on the 240,242 Pu fission cross section, 235 U prompt neutron multiplicity in the resonance region and correlations with fission fragments and prompt γ-ray emission for several isotopes will be presented and put into perspective.

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“…A series of measurements of the prompt J rays in the neutron-induced fission of 235 U and 239,241 Pu, and the spontaneous fission of 252 Cf has been carried out recently using DANCE in coincidence with the detection of fission fragments by a compact parallel-plate avalanche counters (PPAC) [13]. The results on the measured and unfolded fission prompt J-ray energy and multiplicity distributions for those isotopes have been published [12,14]. An independent analysis of the same data for 239 Pu, by assuming a general parameterized correlation between E J and M J , was presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Several unique features exhibited by DANCE are particularly attractive for those measurements, such as the nearly J-ray energy independence for the detection efficiency, the multiplicity response, and the peak-to-total ratio, all of which are described in detail in Refs. [10][11][12]. For example, it enables one to measure the total J-ray energy as a function of multiplicity.…”

Section: Introductionmentioning

confidence: 99%

Total promptγ-ray emission in fission

Chyzh

Kwan

et al. 2016

EPJ Web of Conferences

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Abstract. The total prompt J-ray energy distributions for the neutron-induced fission of 235 U, 239,241 Pu at incident neutron energy of 0.025 eV -100 keV, and the spontaneous fission of 252 Cf were measured using the Detector for Advanced Neutron Capture Experiments (DANCE) array in coincidence with the detection of fission fragments by a parallel-plate avalanche counter. DANCE is a highly segmented, highly efficient 4S J-ray calorimeter. Corrections were made to the measured distribution by unfolding the two-dimension spectrum of total J-ray energy vs multiplicity using a simulated DANCE response matrix. The mean values of the total prompt Jray energy, determined from the unfolded distributions, are ~ 20% higher than those derived from measurements using single J-ray detector for all the fissile nuclei studied. This raises serious concern on the validity of the mean total prompt J-ray energy obtained from the product of mean values for both prompt J-ray energy and multiplicity.

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Evidence for the stochastic aspect of promptγemission in spontaneous fission

Cited by 55 publications

References 10 publications

Measurement of theAm242mneutron-induced reaction cross sections

Measurement of theAm242mneutron-induced reaction cross sections

Fission cross-sections, prompt fission neutron and γ-ray emission in request for nuclear applications

Total promptγ-ray emission in fission

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