Development of a kinematically focused neutron source with the p(7Li,n)7Be inverse reaction

Lebois, M.; Wilson, J. N.; Halipre, P.; Leniau, B.; Matéa, I.; Oberstedt, Andreas; Oberstedt, S.; Verney, D.

doi:10.1016/j.nima.2013.07.061

Cited by 47 publications

(27 citation statements)

References 11 publications

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“…The recent installation of a kinematically focused neutron beam [43] enables the background-free investigation of prompt γ-ray emission in fast-neutron-induced fission on both fissile and non-fissile actinide isotopes.…”

Section: Renaissance Of Prompt Fission γ-Ray Measurementsmentioning

confidence: 99%

“…At LICORNE neutrons are produced in inverse kinematics with 16.5 MeV 7 Li impinging on a hydrogen-containing material [43] or on a H 2 -gas cell, which is already being implemented. The generated forward-directed neutrons have an energy between 0.5 and 4 MeV with a spectral shape similar to that of a typical fast-reactor spectrum.…”

Section: Neutron-induced Fission Onmentioning

confidence: 99%

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Future research program on prompt $\gamma$ -ray emission in nuclear fission

et al. 2015

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Abstract. In recent years the measurement of prompt fission γ-ray spectra (PFGS) has gained renewed interest, after about forty years since the first comprehensive studies of the reactions 235 U(n th , f), 239 Pu(n th , f) and 252 Cf(sf). The renaissance was initiated by requests for new values especially for γ-ray multiplicity and average total energy release per fission in neutron-induced fission of 235 U and 239 Pu. Both isotopes are considered the most important ones with respect to the modeling of innovative cores required for the Generation-IV reactors, the majority working with fast neutrons. During the last 5 years we have conducted a systematic study of spectral data for thermal-neutron-induced fission on 235 U and 241 Pu as well as for the spontaneous fission of 252 Cf with unprecedented accuracy. From the new data we conclude that those reactions do not considerably contribute to the observed heat excess and suspect other reactions playing a significant role. Possible contributions may originate from fast-neutron-induced reactions on 238 U, which is largely present in the fuel, or from γ-induced fission from neutron capture in the construction material. A first experiment campaign on prompt γ-ray emission from fast-neutron-induced fission on 235,238 U was successfully performed in order to test our assumptions. In the following we attempt to summarize, what has been done in the field to date, and to motivate future measurement campaigns exploiting dedicated neutron and photon beams as well as upcoming highly efficient detector assemblies.

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Section: Renaissance Of Prompt Fission γ-Ray Measurementsmentioning

confidence: 99%

Section: Neutron-induced Fission Onmentioning

confidence: 99%

Future research program on prompt $\gamma$ -ray emission in nuclear fission

et al. 2015

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“…The LICORNE neutron source [7,8] produces fast directional neutrons using the inverse reaction p( 7 Li,n) 7 Be. Intense 7 Li beams provided by the Tandem accelerator of the ALTO facility at the IPN Orsay impinge on a gaseous hydrogen target.…”

Section: Production Of Directional Neutrons In Inverse Kinematicsmentioning

confidence: 99%

Production and Study of Neutron-rich Nuclei Using the LICORNE Directional Neutron Source

Wilson¹,

Lebois²,

Qi³

et al. 2017

Acta Phys. Pol. B

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We have recently successfully demonstrated a new technique for production and study of many of the most exotic neutron-rich nuclei at moderate spins. LICORNE, a newly developed directional inverse-kinematic fast neutron source at the IPN Orsay, was coupled to the MINIBALL high resolution γ-ray spectrometer to study nuclei the furthest from stability using the 238 U(n, f ) reaction. This reaction and 232 Th(n, f ) are the most neutron-rich fission production mechanisms achievable and can be used to simultaneously populate hundreds of neutron-rich nuclei up to spins of ≈ 16 . High selectivity in the experiment was achieved via triple γ-ray coincidences and the use of a 400 ns period pulsed neutron beam, a technique which is unavailable to other population mechanisms such as 235 U(n th , f ) and 252 Cf(SF). The pulsing allows time correlations to be exploited to separate delayed γ rays from isomeric states in the hundreds of nuclei produced, which are then used to cleanly select a particular nucleus and its exotic binary partners. In the recent experiment, several physics cases are simultaneously addressed such as shape coexistence, the evolution of shell closures far from stability, and the spectroscopy of nuclei in the r-process path near N = 82. Preliminary physics results on anomalies in the 238 U(n, f ) fission yields and the structure of the 138 Te and 100 Sr nuclei will soon be published. A future project, ν-ball, to couple LICORNE with a hybrid escape-suppressed spectrometer to refine further the technique and achieve a large increase in the observational limit is discussed.

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“…An experiment was performed at the ALTO facility at the IPN Orsay, using the LICORNE neutron source [3]. Results from the experiment will provide important nuclear data for reactor physics, e.g.…”

Section: Introductionmentioning

confidence: 99%

Prompt fission gamma-ray emission spectral data for ²³⁹Pu(n,f) using fast directional neutrons from the LICORNE neutron source

Wilson

Lebois

et al. 2018

EPJ Web Conf.

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Abstract. Prompt fission gamma-ray spectra (PFGS) have been measured for the 239 Pu(n,f) reaction using fast neutrons atĒ n =1.81 MeV produced by the LICORNE directional neutron source. The setup makes use of LaBr 3 scintillation detectors and PARIS phoswich detectors to measure the emitted prompt fission gamma rays (PFG). The mean multiplicity, average total energy release per fission and average energy of photons are extracted from the unfolded PFGS. These new measurements provide complementary information to other recent work on thermal neutron induced fission of 239 Pu and spontaneous fission of 252 Cf.

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Development of a kinematically focused neutron source with the p(7Li,n)7Be inverse reaction

Cited by 47 publications

References 11 publications

Future research program on prompt $\gamma$ -ray emission in nuclear fission

Future research program on prompt $\gamma$ -ray emission in nuclear fission

Production and Study of Neutron-rich Nuclei Using the LICORNE Directional Neutron Source

Prompt fission gamma-ray emission spectral data for ²³⁹Pu(n,f) using fast directional neutrons from the LICORNE neutron source

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Development of a kinematically focused neutron source with the p(7Li,n)7Be inverse reaction

Cited by 47 publications

References 11 publications

Future research program on prompt $\gamma$ -ray emission in nuclear fission

Future research program on prompt $\gamma$ -ray emission in nuclear fission

Production and Study of Neutron-rich Nuclei Using the LICORNE Directional Neutron Source

Prompt fission gamma-ray emission spectral data for 239Pu(n,f) using fast directional neutrons from the LICORNE neutron source

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Product

Resources

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Prompt fission gamma-ray emission spectral data for ²³⁹Pu(n,f) using fast directional neutrons from the LICORNE neutron source