Corrections of Prompt-neutron Emission in Fission-fragment Experiments

Al-Adili, Ali; Hambsch, F.‐J.; Pomp, Stephan; Oberstedt, S.

doi:10.1016/j.phpro.2013.06.019

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…The total fragment excitation energy is shared among the intrinsic excitation, nuclear deformation and collective excitation energies [40]. The prompt emission is assumed to be from fully-accelerated fragments.…”

Section: Resultsmentioning

confidence: 99%

Correlations of neutron multiplicity andγ-ray multiplicity with fragment mass and total kinetic energy in spontaneous fission ofCf252

Wang

Zhu

et al. 2016

Phys. Rev. C

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The dependence of correlations of neutron multiplicity ν and gamma-ray multiplicity Mγ in spontaneous fission of 252 Cf on fragment mass A* and total kinetic energy TKE has been investigated employing the ratio of M γ /ν and the form of Mγ(ν). We show for the first time that Mγ and ν have a complex correlation for heavy fragment masses, while there is a positive dependence of Mγ(ν) for light fragment masses and for near-symmetric mass splits. The ratio Mγ/ν exhibits strong shell effects for the neutron magic number N = 50 and near the doubly magic number shell closure at Z = 50 and N = 82. The gamma-ray multiplicity Mγ has a maximum for TKE = 165-170 MeV. Above 170 MeV Mγ(TKE) is approximately linear, while it deviates significantly from a linear dependence at lower TKE. The correlation between the average neutron and gamma-ray multiplicities can be partly reproduced by model calculations.

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Section: Resultsmentioning

confidence: 99%

Correlations of neutron multiplicity andγ-ray multiplicity with fragment mass and total kinetic energy in spontaneous fission ofCf252

Wang

Zhu

et al. 2016

Phys. Rev. C

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“…[7]. The neutron multiplicity of 234 U was obtained as the average of 233 U and 235 U [13]. In addition to the mass dependence, the neutron multiplicity is dependent on the TKE.…”

Section: Fragment-mass Determinationmentioning

confidence: 99%

Analysis of prompt fission neutrons in²³⁵U(n_th,f) and fission fragment distributions for the thermal neutron induced fission of²³⁴U

Al-Adili

Tarrío

Hambsch

et al. 2016

EPJ Web of Conferences

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Abstract. This paper presents the ongoing analysis of two fission experiments. Both projects are part of the collaboration between the nuclear reactions group at Uppsala and the JRC-IRMM. The first experiment deals with the prompt fission neutron multiplicity in the thermal neutron induced fission of 235 U(n,f). The second, on the fission fragment properties in the thermal fission of 234 U(n,f). The prompt fission neutron multiplicity has been measured at the JRC-IRMM using two liquid scintillators in coincidence with an ionization chamber. The first experimental campaign focused on 235 U(n th ,f) whereas a second experimental campaign is foreseen later for the same reaction at 5.5 MeV. The goal is to investigate how the so-called sawtooth shape changes as a function of fragment mass and excitation energy. Some harsh experimental conditions were experienced due to the large radiation background. The solution to this will be discussed along with preliminary results. In addition, the analysis of thermal neutron induced fission of 234 U(n,f) will be discussed. Currently analysis of data is ongoing, originally taken at the ILL reactor. The experiment is of particular interest since no measurement exist of the mass and energy distributions for this system at thermal energies. One main problem encountered during analysis was the huge background of 235 U(n th ,f). Despite the negligible isotopic traces in the sample, the cross section difference is enormous. Solution to this parasitic background will be highlighted.

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Corrections of Prompt-neutron Emission in Fission-fragment Experiments

Cited by 2 publications

References 18 publications

Correlations of neutron multiplicity andγ-ray multiplicity with fragment mass and total kinetic energy in spontaneous fission ofCf252

Correlations of neutron multiplicity andγ-ray multiplicity with fragment mass and total kinetic energy in spontaneous fission ofCf252

Analysis of prompt fission neutrons in²³⁵U(n_th,f) and fission fragment distributions for the thermal neutron induced fission of²³⁴U

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Corrections of Prompt-neutron Emission in Fission-fragment Experiments

Cited by 2 publications

References 18 publications

Correlations of neutron multiplicity andγ-ray multiplicity with fragment mass and total kinetic energy in spontaneous fission ofCf252

Correlations of neutron multiplicity andγ-ray multiplicity with fragment mass and total kinetic energy in spontaneous fission ofCf252

Analysis of prompt fission neutrons in235U(nth,f) and fission fragment distributions for the thermal neutron induced fission of234U

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Analysis of prompt fission neutrons in²³⁵U(n_th,f) and fission fragment distributions for the thermal neutron induced fission of²³⁴U