Fast neutron spectroscopy from 1 MeV up to 15 MeV with Mimac-FastN, a mobile and directional fast neutron spectrometer

Sauzet, N.; Santos, D.; Guillaudin, O.; Bosson, G.; Bouvier, J.; Descombes, T.; Marton, M.; Muraz, J.F.

doi:10.1016/j.nima.2020.163799

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…In this section, the AMANDE facility makes use of the nuclear reaction 45 Sc (p, n) to produce neutron fields with kinetic energy of 8.12 ± 0.01 keV or 27.24 ± 0.05 keV [33] depending on the energy of the proton beam that activates one resonance or another. A MIMAC chamber specially designed for neutron spectroscopy, MIMAC-FastN [51], is placed in front of the 45 Sc target, at a distance of 33 cm, such that the proton beam is parallel to the Z-axis of the detector. A picture of the experimental setup is shown in figure 11.…”

Section: Methodsmentioning

confidence: 99%

“…In these conditions the BDT is not uniform: it accepts more recoils at large energy than low energy. This non-uniformity would introduce a bias on the angle reconstruction so we instead decide to implement a standard discrimination based on track observables, as in [51]. As an important drawback, this approach rejects fewer background events than the BDT but it accepts almost all recoil events.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Directionality and head-tail recognition in the keV-range with the MIMAC detector by deconvolution of the ionic signal

Beaufort

Guillaudin

Muraz

et al. 2022

J. Cosmol. Astropart. Phys.

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Directional detection is the only strategy for the unambiguous identification of galactic Dark Matter (DM) even in the presence of an irreducible background such as beyond the neutrino floor. This approach requires measuring the direction of a DM-induced nuclear recoil in the keV-range. To probe such low energies, directional detectors must operate at high gain where 3D track reconstruction can be distorted by the influence of the numerous ions produced in the avalanches. The article describes the interplay between electrons and ions during signal formation in a Micromegas. It introduces SimuMimac, a simulation tool dedicated to high gain detection that agrees with MIMAC measurements. This work proposes an analytical formula to deconvolve the ionic signal induced on the grid from any measurements, with no need for prior nor ad hoc parameter. This deconvolution is experimentally tested and validated, revealing the fine structure of the primary electrons cloud and consequently leading to head-tail recognition in the keV-range. Finally, the article presents how this deconvolution can be used for directionality by reconstructing the spectra of mono-energetic 27 keV and 8 keV neutrons with an angular resolution better than 15°. This novel approach for directionality appears as complementary to the standard one from 3D tracks reconstruction and offers redundancy for improving directional performances at high gain in the keV region.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Directionality and head-tail recognition in the keV-range with the MIMAC detector by deconvolution of the ionic signal

Beaufort

Guillaudin

Muraz

et al. 2022

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…In this section, the AMANDE facility makes use of the nuclear reaction 45 Sc (p, n) to produce neutron fields with kinetic energy of 8.12 ± 0.01 keV or 27.24 ± 0.05 keV [28] depending on the energy of the proton beam that activates one resonance or another. A MIMAC chamber specially designed for neutron spectroscopy, MIMAC-FastN [44], is placed in front of the 45 Sc target, at a distance of 33 cm, such that the proton beam is parallel to the Z-axis of the detector. A picture of the experimental setup is shown in Figure 11.…”

Section: Methodsmentioning

confidence: 99%

“…In these conditions the BDT is not uniform: it accepts more recoils at large energy than low energy. This non-uniformity would introduce a bias on the angle reconstruction so we instead decide to implement a standard discrimination based on track observables, as in [44]. As an important drawback, this approach rejects less background events than the BDT but it accept almost all recoil events.…”

Section: Methodsmentioning

confidence: 99%

Directionality and head-tail recognition in the keV-range with the MIMAC detector by deconvolution of the ionic signal

Beaufort,

Guillaudin,

Muraz

et al. 2021

Preprint

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Directional detection is the only admitted strategy for the unambiguous identification of galactic Dark Matter (DM) even in the presence of an irreducible background as beyond the neutrino floor. This approach requires to measure the direction of a DM-induced nuclear recoil in the keV-range. To probe such low energies, directional detectors must operate at high gain where 3D track reconstruction can be distorted by the influence of the numerous ions produced in the avalanches. We describe the interplay between electrons and ions during signal formation in a Micromegas. We introduce SimuMimac, a simulation tool dedicated to high gain detection that agrees with MIMAC measurements. We propose an analytical formula to deconvolve the ionic signal induced on the grid from any measurements, with no need of prior nor ad hoc parameter. We experimentally test and validate this deconvolution, revealing the fine structure of the primary electrons cloud and consequently leading to head-tail recognition in the keV-range. Finally, we present how this deconvolution can be used for directionality by reconstructing mono-energetic neutron spectra at 27 keV and 8 keV with an angular resolution better than 15 • . This novel approach for directionality appears as complementary to the standard one from 3D tracks reconstruction and offers redundancy for improving directional performances at high gain in the keV region.

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“…Neutron field. The purpose of these studies is spectral and flux characterization of the high flux epithermal neutron fields produced by the neutron source using a new directional spectrometer developed by the Laboratory of Subatomic Physics and Cosmology CNRS-IN2P3, Grenoble-Alpes University (France) [49] and by detectors, methods, and standards used by the Laboratory of Micro-Irradiation, Metrology, and Neutron Dosimetry, IRSN (Cadarache, France). This characterization has never been done for an epithermal neutron field.…”

mentioning

confidence: 99%

Neutron Source Based on Vacuum Insulated Tandem Accelerator and Lithium Target

Taskaev

Berendeev

Bikchurina

et al. 2021

Biology

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A compact accelerator-based neutron source has been proposed and created at the Budker Institute of Nuclear Physics in Novosibirsk, Russia. An original design tandem accelerator is used to provide a proton beam. The proton beam energy can be varied within a range of 0.6–2.3 MeV, keeping a high-energy stability of 0.1%. The beam current can also be varied in a wide range (from 0.3 mA to 10 mA) with high current stability (0.4%). In the device, neutron flux is generated as a result of the 7Li(p,n)7Be threshold reaction. A beam-shaping assembly is applied to convert this flux into a beam of epithermal neutrons with characteristics suitable for BNCT. A lot of scientific research has been carried out at the facility, including the study of blistering and its effect on the neutron yield. The BNCT technique is being tested in in vitro and in vivo studies, and the methods of dosimetry are being developed. It is planned to certify the neutron source next year and conduct clinical trials on it. The neutron source served as a prototype for a facility created for a clinic in Xiamen (China).

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Fast neutron spectroscopy from 1 MeV up to 15 MeV with Mimac-FastN, a mobile and directional fast neutron spectrometer

Cited by 5 publications

References 14 publications

Directionality and head-tail recognition in the keV-range with the MIMAC detector by deconvolution of the ionic signal

Directionality and head-tail recognition in the keV-range with the MIMAC detector by deconvolution of the ionic signal

Directionality and head-tail recognition in the keV-range with the MIMAC detector by deconvolution of the ionic signal

Neutron Source Based on Vacuum Insulated Tandem Accelerator and Lithium Target

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