Production of a 62 PBq 51Cr low energy neutrino source for GALLEX

Cribier, M.; Gösset, L.; Lamare, P.; Languillat, J.-C.; Perrin, Paul B.; Renard, Michel; Rich, J.; Soirat, J.P.; Spiro, M.; Stolarczyk, Th.; Tao, C.; Vignaud, D.; Bévilacqua, A.; Caperan, F.; Dupont, Graham; Gorry, J.; Hampel, W.; Heusser, G.; Kirsten, T.; Pernicka, Ernst; Schlosser, C.; Sann, M.; Ammon, R. von; Henrich, Ε.; Altmann, M.; Mößbauer, R. L.; Bellotti, E.; Cattadori, C.; Fiorini, E.; Latorre, S.; Balata, M.; Franciotti, D.; Lembo, L. J.; Bacci, C.; Belli, P.; Boger, J.; Hahn, R. L.; Hartmann, F.; Chu, Y. Y.; Prusakov, V.N.; Tikhomirov, A. V.

doi:10.1016/0168-9002(96)00464-0

Cited by 41 publications

(20 citation statements)

References 24 publications

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“…We take as reference the irradiation performed in 1994 to produce the 1.7 MCi source of GALLEX [19,24]. This source was obtained by neutron activation of the full sample of 36 kg of Cr, in the form of ∼1 mm 3 metal chips, with a total number of 50 Cr nuclei amounting to 1.6 × 10 26 .…”

Section: Activation Of the Cr Samplementioning

confidence: 99%

“…In GALLEX, despite the special care taken in all the chemical processing stages, impurities with (n,γ) cross section in the barn range were activated during irradiation, producing radionuclides with lifetime of several days. In particular, the 1.3-1.5 MeV γ emitter 110m Ag (T 1/2 = 150 d) was found with an activity of 4 GBq [32], while other long-lived emitters such as 46 Sc (1.2 MeV), 60 Co (1.1-1.3 MeV) and 124 Sb (2 MeV) were found with an activity smaller than 0.5 GBq [24]. Assuming the same activation factor of GALLEX, an activity around 12 GBq is expected from a 5 MCi source.…”

Section: Activation Of the Cr Samplementioning

confidence: 99%

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Coherent elastic nuclear scattering of $$^{51}$$Cr neutrinos

et al. 2019

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Searches for new physics in the coherent elastic neutrino-nucleus scattering require a precise knowledge of the neutrino flux and energy spectrum. In this paper we investigate the feasibility and the performances of an experiment based on a 51 Cr source, whose neutrino spectrum is known and whose activity can be heat-monitored at few permil level. With a 5 MCi source placed at ∼ 25 cm from the detector, under an exposure of two 51 Cr half-lives (55.4 days), we evaluate 3900 (900) counts on a 2 dm 3 target of germanium (sapphire) featuring an energy threshold of 8 (20) eV. To further increase the exposure, multiple activations of the same source could be possible.

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Section: Activation Of the Cr Samplementioning

confidence: 99%

Section: Activation Of the Cr Samplementioning

confidence: 99%

Coherent elastic nuclear scattering of $$^{51}$$Cr neutrinos

et al. 2019

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“…The two measurements in GALLEX experiment [29] have been performed with 51 Cr radioactive sources. In each case the radioactive source can be approximated by a homogeneous sphere of radius r GALLEX s ≈ 0.4 m. The source was placed in a center of the vessel which for our purposes can be approximate as a sphere of radius r GALLEX ≈ 2.5 m, the radius of the central part with source is r GALLEX c ≈ 0.45 m. To describe the expected ratio of the signals with sterile neutrino and without sterile neutrino one can use the same formula (3) with the same values of E i and f i , as those adopted for the SAGE with 51 Cr source, and r 1 = r GALLEX c , r 2 = r GALLEX .…”

Section: Gallium Anomalymentioning

confidence: 99%

BEST sensitivity to O(1) eV sterile neutrino

Barinov¹,

Гаврин²,

Gorbunov

et al. 2016

Phys. Rev. D

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Numerous anomalous results in neutrino oscillation experiments can be attributed to interference of ∼ 1 eV sterile neutrino. The specially designed to fully explore the Gallium anomaly Baksan Experiment on Sterile Transitions (BEST) starts next year. We investigate the sensitivity of BEST in searches for sterile neutrino mixed with electron neutrino. Then, performing the combined analysis of all the Gallium experiments (SAGE, GALLEX, BEST) we find the regions in model parameter space (sterile neutrino mass and mixing angle), which will be excluded if BEST agrees with no sterile neutrino hypothesis. For the opposite case, if BEST observes the signal as it follows from the sterile neutrino explanation of the Gallium (SAGE and GALLEX) anomaly, we show how BEST will improve upon the present estimates of the model parameters.

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“…144 Cs-144 Pr, 106 Ru- 106 Rh, 90 Sr- 90 Y, 42 Ar-42 K) [10,11]. The 51 Cr sources (∼66 PBq, ∼18.5 PBq) as the dichromatic ν e emitters with energies of 430 keV (10 %) and 750 keV (90 %), and a mean life time (τ 40 days) have already been utilised to calibrate GALLEX and SAGE experiments [12][13][14][15][16], where a deficit in the rate of ν interactions has been found [17,18]. The 37 Ar source (∼14.8 PBq) has also been used by SAGE [19].…”

Section: Introductionmentioning

confidence: 99%

Probing neutrino nature at Borexino detector with chromium neutrino source

Sobków

Błaut

2016

Eur. Phys. J. C

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In this paper, we indicate a possibility of utilizing the intense chromium source (∼370 PBq) in probing the neutrino nature in low energy neutrino experiments with the ultra-low threshold and background real-time Borexino detector located near the source (∼8 m). We analyse the elastic scattering of electron neutrinos (Dirac or Majorana, respectively) on the unpolarised electrons in the relativistic neutrino limit. We assume that the incoming neutrino beam is the superposition of left-right chiral states produced by the chromium source. Left chiral neutrinos may be detected by the standard V − A and non-standard scalar S L , pseudoscalar P L , tensor T L interactions, while right chiral ones partake only in the exotic V + A and S R , P R , T R interactions. Our model-independent study is carried out for the flavour (current) neutrino eigenstates. We compute the expected event number for the standard V − A interaction of the left chiral neutrinos using the current experimental values of standard couplings and in the case of left-right chiral superposition. We show that the significant decrement in the event number due to the interference terms between the standard and exotic interactions for the Majorana neutrinos may appear. We also demonstrate how the presence of the exotic couplings affects the energy spectrum of outgoing electrons, both for the Dirac and Majorana cases. The 90 % C.L. sensitivity contours in the planes of corresponding exotic couplings are found. The presence of interferences in the Majorana case gives the stronger constraints than for the Dirac neutrinos, even if the neutrino source is placed outside the detector.

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Production of a 62 PBq 51Cr low energy neutrino source for GALLEX

Cited by 41 publications

References 24 publications

Coherent elastic nuclear scattering of $$^{51}$$Cr neutrinos

Coherent elastic nuclear scattering of $$^{51}$$Cr neutrinos

BEST sensitivity to O(1) eV sterile neutrino

Probing neutrino nature at Borexino detector with chromium neutrino source

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