Measurement of neutrino source activity in the experiment BEST by calorimetric method

Гаврин, В. Н.; Ибрагимова, Т. В.; Kozlova, J.; Тарасов, В.А.; Veretenkin, E. P.; Zvir, A. I.

doi:10.1088/1748-0221/16/04/p04012

Cited by 12 publications

(9 citation statements)

References 7 publications

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“…A full description of the source and the calorimetric measurements of its intensity can be found in Refs. [23,24]. The 51 Cr isotope emits ν e 's at four energies; 747 keV (81.63%), 427 keV (8.95%), 752 keV (8.49%) and 432 keV (0.93%).…”

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confidence: 99%

Results from the Baksan Experiment on Sterile Transitions (BEST)

Barinov,

Cleveland,

Danshin

et al. 2021

Preprint

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The Baksan Experiment on Sterile Transitions (BEST) was designed to investigate the deficit of electron neutrinos, νe, observed in previous gallium-based radiochemical measurements with highintensity neutrino sources, commonly referred to as the gallium anomaly, which could be interpreted as evidence for oscillations between νe and sterile neutrino (νs) states. A 3.414-MCi 51 Cr νe source was placed at the center of two nested Ga volumes and measurements were made of the production of 71 Ge through the charged current reaction, 71 Ga(νe,e − ) 71 Ge, at two average distances. The measured production rates for the inner and the outer targets respectively are (54.9 +2.5 −2.4 (stat) ± 1.4(syst)) and (55.6 +2.7 −2.6 (stat) ± 1.4(syst)) atoms of 71 Ge/d. The ratio (R) of the measured rate of 71 Ge production at each distance to the expected rate from the known cross section and experimental efficiencies are Rin = 0.791 ± 0.05 and Rout = 0.766 ± 0.05. The ratio of the outer to the inner result is 0.97±0.07, which is consistent with unity within uncertainty. The rates at each distance were found to be similar, but 20-24% lower than expected, thus reaffirming the anomaly. These results are consistent with νe → νs oscillations with a relatively large ∆m 2 (>1 eV 2 ) and mixing sin 2 2θ (≈0.4).

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confidence: 99%

Results from the Baksan Experiment on Sterile Transitions (BEST)

Barinov,

Cleveland,

Danshin

et al. 2021

Preprint

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“…Compared with section 2, the fitter has an extra fit parameter due to the neutrino flux uncertainty from 51 Cr. In the following analysis, we assume the uncertainty of neutrino flux from 51 Cr is 1% [35,36,38]. Other parameters are consistent with the standard case in section 2 as shown in table 3.…”

Section: Sensitivitymentioning

confidence: 90%

“…In this study we explore the possibility of carrying νMM measurement at Jinping neutrino experiment through solar neutrinos. Besides, we also consider the physics study of deloying a MCi-scale electron-capture neutrino source, 51 Cr [33][34][35][36][37][38], which is a commonly used source in scientific study and can release sub-MeV neutrinos, as proposed by references [39,40].…”

Section: Jhep08(2021)068mentioning

confidence: 99%

“…According to the BEST experiment [38], we assume a 3 MCi 51 Cr source [40] can be placed at two possible locations: outside with 1 meter away from the edge of the fiducial volume or inside at the center of detector. Figure 5 shows the cartoon sketch of the proposed source positions.…”

Section: Cr Neutrino Signalsmentioning

confidence: 99%

“…The status of parameters in Minuit. The constraint of 51 Cr comes from the independent measurements by calorimeter technique in [35,36,38]. Gallium experiments constrain the flux of pp neutrinos with about 5%.…”

Section: Sensitivitymentioning

confidence: 99%

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Probing neutrino magnetic moment at the Jinping neutrino experiment

Yue

Liao

Ling

2021

J. High Energ. Phys.

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Neutrino magnetic moment (νMM) is an important property of massive neutrinos. The recent anomalous excess at few keV electronic recoils observed by the XENON1T collaboration might indicate a ∼ 2.2 × 10−11μB effective neutrino magnetic moment ($$ {\mu}_{\nu}^{\mathrm{eff}} $$ μ ν eff ) from solar neutrinos. Therefore, it is essential to carry out the νMM searches at a different experiment to confirm or exclude such a hypothesis. We study the feasibility of doing νMM measurement with 4 kton fiducial mass at Jinping neutrino experiment (Jinping) using electron recoil data from both natural and artificial neutrino sources. The sensitivity of $$ {\mu}_{\nu}^{\mathrm{eff}} $$ μ ν eff can reach < 1.2 × 10−11μB at 90% C.L. with 10-year data taking of solar neutrinos. Besides the abundance of the intrinsic low energy background 14C and 85Kr in the liquid scintillator, we find the sensitivity to νMM is highly correlated with the systematic uncertainties of pp and 85Kr. Reducing systematic uncertainties (pp and 85Kr) and the intrinsic background (14C and 85Kr) can help to improve sensitivities below these levels and reach the region of astrophysical interest. With a 3 mega-Curie (MCi) artificial neutrino source 51Cr installed at Jinping neutrino detector for 55 days, it could give us a sensitivity to the electron neutrino magnetic moment ($$ {\mu}_{\nu_e} $$ μ ν e ) with < 1.1 × 10−11μB at 90% C.L. . With the combination of those two measurements, the flavor structure of the neutrino magnetic moment can be also probed at Jinping.

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Towards resolving the gallium anomaly

Brdar

Gehrlein

2023

J. High Energ. Phys.

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A series of experiments studying neutrinos from intense radioactive sources have reported a deficit in the measured event rate which, in combination, has reached a statistical significance of ∼ 5σ. In this paper, we explore avenues for explaining this anomaly, both within the Standard Model and beyond. First, we discuss possible biases in the predicted cross section for the detection reaction νe + 71Ga → e− + 71Ge, which could arise from mismeasurement of the inverse process, 71Ge decay, or from the presence of as yet unknown low-lying excited states of 71Ga. The latter would imply that not all 71Ge decays go to the ground state of 71Ga, so the extraction of the ground state-to-ground state matrix element relevant for neutrino capture on gallium would be incorrect. Second, we scrutinize the measurement of the source intensity in gallium experiments, and we point out that a ∼ 2% error in the branching ratios for 51Cr decay would be enough to explain the anomaly. Third, we investigate the calibration of the radiochemical germanium extraction efficiency as a possible origin of anomaly. Finally, we outline several new explanations beyond the Standard Model, including scenarios with sterile neutrinos coupled to fuzzy dark matter or to dark energy, as well as a model with decaying sterile neutrinos. We critically assess the viability of these scenarios, and others that have been proposed, in a summary table.

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Measurement of neutrino source activity in the experiment BEST by calorimetric method

Cited by 12 publications

References 7 publications

Results from the Baksan Experiment on Sterile Transitions (BEST)

Results from the Baksan Experiment on Sterile Transitions (BEST)

Probing neutrino magnetic moment at the Jinping neutrino experiment

Towards resolving the gallium anomaly

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