High-energy gamma-rays accompanying the spontaneous fission of252Cf

Hotzel, A.; Thirolf, P. G.; Ender, C.; Schwalm, D.; Mutterer, M.; Singer, Péter; Klemens, M.; Theobald, J.P.; Hesse, Manfred; Gönnenwein, F.; Ploeg, H. van der

doi:10.1007/bf02769233

Cited by 23 publications

(36 citation statements)

References 9 publications

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“…5. These structures were also found in the PFGS for spontaneous fission of 252 Cf [16]. The origins of the hump structures in the present PFGS for the 235 U(n th , f ) reaction will be discussed in further publication.…”

Section: Resultssupporting

confidence: 56%

Measurement of high-energy prompt gamma-rays from neutron induced fission of U-235

Makii

Nishio²,

Hirose³

et al. 2017

EPJ Web Conf.

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Abstract.We have developed a new setup to measure prompt γ -rays from the 235 U(n th , f ) reaction. The setup consists of two multi-wire proportional counters (MWPCs) to detect the fission fragments, two LaBr 3 (Ce) scintillators to measure the γ -rays. The highly efficient setup was installed at the PF1B beam line of the Institut Laue Langevin (ILL). We have successfully measured the γ -ray spectrum up to about 20 MeV for the fist time in neutron-induced fission.

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Section: Resultssupporting

confidence: 56%

Measurement of high-energy prompt gamma-rays from neutron induced fission of U-235

Makii

Nishio²,

Hirose³

et al. 2017

EPJ Web Conf.

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“…In addition a shape change has been found for specific masses around the double magic mass A = 132 confirming results from Ref. [28]. More experiments are planned both at thermal and higher incident neutron energies.…”

Section: Discussionsupporting

confidence: 87%

“…Apart from the strongly changing structure at γ-ray energies below 1 MeV, a distinct shape change at mass splits with a heavy mass around or smaller than A = 132 is observed. A harder γ -ray spectrum was already observed in the 1990s [28] in an experiment with a 4π NaI-detector array and attributed to non-statistical γ -emission with E > 3.5 MeV from spherical fission fragments. The present data shows that the shape change starts already around 2.5 MeV.…”

Section: Methodsmentioning

confidence: 84%

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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“…Finally, the exclusive spectra can shed light on the quality of our calculations. In our current implementation, we reproduce qualitatively, but not quantitatively, trends observed in the exclusive experimental spectra stemming from specific initial fission fragments [50].…”

Section: Discussionmentioning

confidence: 81%

Properties of prompt-fissionγrays

et al. 2014

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In a Monte-Carlo Hauser-Feshbach statistical framework, we describe spectra, average multiplicities, average energy and multiplicity distributions of the prompt γ rays produced in the thermal neutron-induced fission of 235 U and 239 Pu, and the spontaneous fission of 252 Cf. Comparisons against recent experimental data show reasonable agreement in all cases investigated, after adjustment of the initial spin distribution in the fission fragments. In particular, when we include in the calculation the Doppler broadening we obtain a qualitatively good description of the measured low-energy spectra, where contributions from collective discrete transitions in specific fragments can be identified. At higher energies, both the calculated neutron and γ-ray spectra are softer than experimental data. The impact of selected model parameters on the prompt neutron and γ-ray spectra is analyzed. Finally, we present prompt γ spectrum and multiplicity distribution for the neutron-induced fission of 235 U for 5.5 MeV neutron incident energy, just below the threshold for second-chance fission.

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High-energy gamma-rays accompanying the spontaneous fission of252Cf

Cited by 23 publications

References 9 publications

Measurement of high-energy prompt gamma-rays from neutron induced fission of U-235

Measurement of high-energy prompt gamma-rays from neutron induced fission of U-235

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

Properties of prompt-fissionγrays

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