Measured and simulated 
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 prompt neutron-photon competition

Marcath, Matthew J.; Haight, R. C.; Vogt, R.; Devlin, M.; Talou, P.; Stetcu, I.; Randrup, J.; Schuster, P.; Clarke, Shaun D.; Pozzi, Sara A.

doi:10.1103/physrevc.97.044622

Cited by 22 publications

(20 citation statements)

References 49 publications

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“…Because the experimental setup for this analysis was described in detail in Ref. [23], we only briefly summarize the parts of the setup relevant for this analysis here. The Chi-Nu array consists of 54 EJ309 liquid scintillator detectors mounted at 15 o intervals along six arcs to form a hemispherical distribution of detectors.…”

Section: Measurement Setup and Methodsmentioning

confidence: 99%

“…The measurement offers improved angle resolution, excellent timing resolution, and enhanced background suppression compared to previous work [4,22]. A previous paper by the authors investigated correlations between the prompt neutron and photon multiplicities [23]. This work includes the first com-parison of correlated neutron energy characteristics for 252 Cf spontaneous fission, including a new observable: the average energy of neutrons detected in coincidence with emitted neutrons at a given energy as a function of the angle between them.…”

Section: Introductionmentioning

confidence: 99%

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High resolution measurement of tagged two-neutron energy and angle correlations in Cf252 (sf)

et al. 2019

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Background: Spontaneous fission events emit prompt neutrons correlated with one another in emission angle and energy. Purpose: We explore the relationship in energy and angle between correlated prompt neutrons emitted from 252 Cf spontaneous fission. Methods: Measurements with the Chi-Nu array provide experimental data for coincident neutrons tagged with a fission chamber signal with 10 o angular resolution and 1 ns timing resolution for time-of-flight energy calculations. The experimental results are compared to simulations produced by the fission event generators CGMF, FREYA, and MCNPX-POLIMI IPOL(1)=1. Results: We find that the measurements and the simulations all exhibit anisotropic neutron emission, though differences exist between fission event generators. Conclusions: This work shows that the dependence of detected neutron energy on the energy of a neutron detected in coincidence, although weak, is non-negligible,indicating that there may be correlations in energy between two neutrons emitted in the same fission event.

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Section: Measurement Setup and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High resolution measurement of tagged two-neutron energy and angle correlations in Cf252 (sf)

et al. 2019

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“…Furthermore, PFGs can deposit energy far away from where they are emitted, creating potential heating challenges in nuclear reactors [4]. Therefore, experiments measuring PFG characteristics for new fissioning systems and energy regions have been conducted [8][9][10], and progress has been made in accurate modeling PFG emission [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Excitation energy dependence of prompt fission γ -ray emission from Pu241*

et al. 2021

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Prompt fission γ rays (PFGs) resulting from the 240 Pu(d,pf) reaction have been measured as a function of fissioning nucleus excitation energy E x at the Oslo Cyclotron Laboratory. We study the average total PFG multiplicity per fission, the average total PFG energy released per fission, and the average PFG energy. No significant changes in these characteristics are observed over the range 5.75 < E x < 8.25 MeV. The physical implications of this result are discussed. The experimental results are compared to simulations conducted using the computational fission model FREYA. We find that FREYA reproduces the experimental PFG characteristics within 8% deviation across the E x range studied. Previous excitation energy-dependent PFG measurements conducted below the second-chance fission threshold have large uncertainties, but are generally in agreement with our results within a 2σ confidence interval. However, both a published parametrization of the PFG energy dependence and the most recent PFG evaluation included in ENDF/B-VIII.0 were found to poorly describe the PFG excitation-energy dependence observed in this and previous experiments.

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“…In addition, many experimental setups are designed to detect either neutrons [2,3] or γ rays [4] or fission fragments [5][6][7][8] but rarely to measure correlated data [3,16]. When validating a model for correlated observables, it is often necessary to rely on separate measurements from different facilities and experimental setups.…”

mentioning

confidence: 99%

“…The emission of prompt neutrons and γ rays from fission fragments strongly depends on the excitation energy available in each fragment. The average number of neutrons, or multiplicity, decreases with increasing kinetic energy of the two fission fragments [9][10][11], while correlations between prompt neutron and γ multiplicities remain the subject of disagreement [12][13][14][15][16]. In this paper, * Electronic address: lovell@lanl.gov we propose a novel method to exploit energy correlations between the prompt γ rays emitted in fission and the total kinetic energy (TKE) of the fission fragments in order to extract the multiplicity distribution of the prompt fission neutrons, P (ν).…”

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confidence: 99%

Prompt neutron multiplicity distributions inferred from γ -ray and fission fragment energy measurements

et al. 2019

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We propose a novel method to extract the prompt neutron multiplicity distribution, P (ν), in fission reactions based on correlations between prompt neutrons, γ rays, and fragment kinetic energy arising from energy conservation. In this approach, only event-by-event measurements of the total γ-ray energy released as a function of the total kinetic energy (TKE) of the fission fragments are performed, and no neutron detection is required. Using the CGMF fission event generator, we illustrate the method and explore the accuracy of extracting the neutron multiplicity distribution when taking into account the energy resolution and calibration of the TKE measurement. We find that a TKE resolution of under 2 MeV produces reasonably accurate results.

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Measured and simulated Cf(sf)252 prompt neutron-photon competition

Cited by 22 publications

References 49 publications

High resolution measurement of tagged two-neutron energy and angle correlations in Cf252 (sf)

High resolution measurement of tagged two-neutron energy and angle correlations in Cf252 (sf)

Excitation energy dependence of prompt fission γ -ray emission from Pu241*

Prompt neutron multiplicity distributions inferred from γ -ray and fission fragment energy measurements

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