Measurement of neutron yield by 62 MeV proton beam on a thick beryllium target

Osipenko, M.; Ripani, M.; Alba, R.; Ricco, G.; Schillaci, M.; Barbagallo, M.; Boccaccio, P.; Celentano, A.; Colonna, N.; Coséntino, L.; Zoppo, A. Del; Pietro, A. Di; Esposito, J.; Figuera, P.; Finocchiaro, P.; Kostyukov, A.; Maiolino, C.; Santonocito, D.; Scuderi, V.; Viberti, Carlo Maria

doi:10.1016/j.nima.2013.04.074

Cited by 18 publications

(14 citation statements)

References 23 publications

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“…The experimental measurements in ref. [29] which are not included in the ENDF/B-VII proton database, show a difference about a factor of two greater than the values obtained with the two simulation packages below 1-2 MeV. However simulation values are higher in the range 2-70 MeV, so overall we expect the experimental and simulated neutron yields values integrated over the entire energy range (1-70 MeV), to be similar.…”

Section: Validation Studiesmentioning

confidence: 67%

“…Differential neutron yields for several angles and various beam energies were measured in References [22]- [28]. New measurements of the neutron yield produced by a 62 MeV proton beam on a thick beryllium target were performed at Laboratori Nazionali del Sud (LNS) of INFN using the existing superconducting cyclotron [29]. A 62 MeV proton beam with an operating beam current of 30-50 pA was extracted from the cyclotron and transported through the beam transport system to the target.…”

Section: Validation Studiesmentioning

confidence: 99%

“…The ENDF VII database library for particle cross sections was released in December 2011 and therefore it does not contain the experimental results measured in Ref. [29] at the later date. However, at larger angles, there is a good agreement between these two, even for low energy neutrons (above 2 MeV).…”

Section: Validation Studiesmentioning

confidence: 99%

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Optimizing the ⁸Li yield for the IsoDAR Neutrino Experiment

Bungau

Alonso

Bartoszek³

et al. 2019

J. Inst.

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The IsoDAR sterile-neutrino search requires a very high intensity neutrino source. For IsoDAR, this high intensity is produced using the high neutron flux from a 60 MeV, 10 mA proton beam striking a beryllium target that floods a sleeve of highly-enriched Li-7. Through neutron capture the Li-7 is transmuted to Li-8, which beta-decays giving the desired high neutrino flux for very-short baseline neutrino experiments. The target can be placed very close to can existing large neutrino detector, which is typically located deep underground to reduce backgrounds. With such a setup, it is necessary to design a shielding enclosure for the target to prevent neutrons from causing unacceptable activation of the rock walls close to the target. Various materials have been studied including steel to thermalize the high energy neutrons and two new types of concrete developed by Jefferson Laboratory, one very light with shredded plastic aggregate, and the other one enriched with high quantities of boron. The shielding is asymmetrical, having a larger thickness towards the detector in order to suppress the neutron and gamma background in the neutrino detector. Simulation results for rock activation and for detector backgrounds are presented.

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Section: Validation Studiesmentioning

confidence: 67%

Section: Validation Studiesmentioning

confidence: 99%

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Optimizing the ⁸Li yield for the IsoDAR Neutrino Experiment

Bungau

Alonso

Bartoszek³

et al. 2019

J. Inst.

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“…As neutron source driving the core we assumed (p,n) reactions produced by 70 MeV protons fully absorbed by a Beryllium target, placed inside a 6 cm radius central axial beam pipe filled with helium gas as coolant. For a 1 mA proton current, the produced neutron intensity is about 8 10 14 neutrons/sec [5], however in the following all computed observables will be given per single source neutron. except for power distributions.…”

Section: The Modelmentioning

confidence: 99%

Influence of reflector materials and core coolant on the characteristics of accelerator driven systems

Panza

Osipenko

Ricco

et al. 2017

Annals of Nuclear Energy

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In this paper we simulated the behavior of a simple ADS model, based on MOX fuel embedded in solid lead, in terms of multiplication coefficient k ef f , thermal power and absolute neutron spectra. In the first part of the paper, we report on the results obtained when modifying the reflector surrounding the fission core, by replacing pure lead with a layered graphite/lead structure. We found that, by appropriately choosing position and thickness of the graphite and lead layers, it is possible to obtain a "hybrid" system where the neutron spectrum in the core still exhibits a fast character, while the spectrum in the graphite layer is considerably softer, becoming thermal in the most peripheral positions. In order to obtain such a modulation of the neutron spectra from the center of the system to the periphery, a careful choice of the materials has to be made in order to avoid large variations of the local power at the core boundary. However, the smoothness of the power distribution is obtained at the expense of lower values of k ef f and the total power of the system. In the second part of the paper, we explored the option of adopting light water as coolant, instead of the helium gas assumed in the initial design. We found that this produces an increase in k ef f and thermal power, without significantly perturbing the fast character of the system and without introducing spatial power excursions in any place within the core. The characteristics obtained may allow to design a system where fast, mixed and thermal spectra can be used to expand the use of the ADS as an irradiation facility.

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“…A dedicated measurement of the neutron yield from Beryllium at the similar energy of 62 MeV was performed by an INFN team at Laboratori Nazionali del Sud in Catania, Italy [22,24]. Figure 2 shows a vertical and horizontal section of the vessel containing the active core, with the convertor target situated approximately at the centre of the core and the inlet for the incident proton beam.…”

Section: Epj Web Of Conferencesmentioning

confidence: 99%