Limits on electron-neutrino oscillations from the GALLEX 51Cr source experiment

Bahcall, John N.; Krastev, P. I.; Lisi, E.

doi:10.1016/0370-2693(95)00111-w

Cited by 50 publications

(52 citation statements)

References 10 publications

(12 reference statements)

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“…Introduction.-Sterile neutrinos with masses in the range Δm 2 ¼ 0.1-10 eV 2 have been posited to explain anomalies in accelerator [1][2][3], reactor [4], and radioactive source [5] oscillation experiments. Several null results [6][7][8][9][10] restrict the available parameter space of the minimal 3 þ 1 model, which assumes mixing of the three active neutrinos with a single sterile neutrino, resulting in three light and one heavier mass state.…”

Section: H Y S I C a L R E V I E W L E T T E R S Week Ending 12 Augusmentioning

confidence: 99%

Searches for Sterile Neutrinos with the IceCube Detector

Aartsen¹,

Abraham²,

Ackermann³

et al. 2016

Phys. Rev. Lett.

240

350

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The IceCube neutrino telescope at the South Pole has measured the atmospheric muon neutrino spectrum as a function of zenith angle and energy in the approximate 320 GeV to 20 TeV range, to search for the oscillation signatures of light sterile neutrinos. No evidence for anomalous $\nu_\mu$ or $\bar{\nu}_\mu$ disappearance is observed in either of two independently developed analyses, each using one year of atmospheric neutrino data. New exclusion limits are placed on the parameter space of the 3+1 model, in which muon antineutrinos would experience a strong MSW-resonant oscillation. The exclusion limits extend to $\mathrm{sin}^2 2\theta_{24} \leq$ 0.02 at $\Delta m^2 \sim$ 0.3 $\mathrm{eV}^2$ at the 90\% confidence level. The allowed region from global analysis of appearance experiments, including LSND and MiniBooNE, is excluded at approximately the 99\% confidence level for the global best fit value of $|$U$_{e4}|^2$.Comment: 10 pages, 5 figure

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Section: H Y S I C a L R E V I E W L E T T E R S Week Ending 12 Augusmentioning

confidence: 99%

Searches for Sterile Neutrinos with the IceCube Detector

Aartsen¹,

Abraham²,

Ackermann³

et al. 2016

Phys. Rev. Lett.

240

350

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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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“…The mixing angles and mass-squared differences that describe these oscillations have been well measured [3], but the CP-violating phase value remains unknown. Nevertheless, there remain anomalies in accelerator [4][5][6], reactor [7], and radioactive source [8] experiments that do not fit this model well. These anomalies are often explained by introducing a new neutrino state, ν s , that does not participate in the Standard Model (SM) weak interactions, hence the name sterile neutrino.…”

Section: Introductionmentioning

confidence: 99%

Exploring a nonminimal sterile neutrino model involving decay at IceCube

et al. 2018

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We study the phenomenology of neutrino decay together with neutrino oscillations in the context of eV-scale sterile neutrinos. We review the formalism of visible neutrino decay in which one of the decay products is a neutrino that potentially can be observed. We apply the formalism developed for decay to the recent sterile neutrino search performed by IceCube with TeV neutrinos. We show that for a ν 4 lifetime τ 4 /m 4 ≲ 10 −16 eV −1 s, the interpretation of the high-energy IceCube analysis can be significantly changed.

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Limits on electron-neutrino oscillations from the GALLEX 51Cr source experiment

Cited by 50 publications

References 10 publications

Searches for Sterile Neutrinos with the IceCube Detector

Searches for Sterile Neutrinos with the IceCube Detector

Probing neutrino nature at Borexino detector with chromium neutrino source

Exploring a nonminimal sterile neutrino model involving decay at IceCube

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