scholarly journals Homestake result, sterile neutrinos, and low energy solar neutrino experiments

2004 ◽  
Vol 69 (11) ◽  
Author(s):  
P. C. de Holanda ◽  
A. Yu. Smirnov
Keyword(s):  
Solar Neutrino ◽  
Low Energy ◽  
Sterile Neutrinos ◽  
Neutrino Experiments

scholarly journals Combined Effect of NSI and SFP on Solar Electron Neutrino Oscillation

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Deniz Yilmaz
Keyword(s):  
Neutrino Oscillation ◽  
Solar Neutrino ◽  
Survival Probability ◽  
Low Energy ◽  
Electron Neutrino ◽  
Combined Effect ◽  
Neutrino Interaction ◽  
Dirac Particles ◽  
Electron Neutrinos ◽  
Neutrino Experiments

The combined effect of spin-flavor precession (SFP) and the nonstandard neutrino interaction (NSI) on the survival probability of solar electron neutrinos (assumed to be Dirac particles) is examined for various values ofϵ11,ϵ12, andμB. It is found that the neutrino survival probability curves affected by SFP and NSI effects individually for some values of the parameters (ϵ11,ϵ12, andμB) get close to the standard MSW curve when both effects are combined. Therefore, the combined effect of SFP and NSI needs to be taken into account when the solar electron neutrino data obtained by low energy solar neutrino experiments is investigated.

scholarly journals Identification of the cosmogenic $$^{11}$$C background in large volumes of liquid scintillators with Borexino

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
M. Agostini ◽  
K. Altenmüller ◽  
S. Appel ◽  
V. Atroshchenko ◽  
Z. Bagdasarian ◽  
...  
Keyword(s):  
Solar Neutrino ◽  
Time Correlation ◽  
Space Time ◽  
Low Energy ◽  
High Multiplicity ◽  
Data Sets ◽  
Novel Technique ◽  
Energy Neutrino ◽  
Time Correlations ◽  
Neutrino Experiments

AbstractCosmogenic radio-nuclei are an important source of background for low-energy neutrino experiments. In Borexino, cosmogenic $$^{11}$$ 11 C decays outnumber solar pep and CNO neutrino events by about ten to one. In order to extract the flux of these two neutrino species, a highly efficient identification of this background is mandatory. We present here the details of the most consolidated strategy, used throughout Borexino solar neutrino measurements. It hinges upon finding the space-time correlations between $$^{11}$$ 11 C decays, the preceding parent muons and the accompanying neutrons. This article describes the working principles and evaluates the performance of this Three-Fold Coincidence (TFC) technique in its two current implementations: a hard-cut and a likelihood-based approach. Both show stable performances throughout Borexino Phases II (2012–2016) and III (2016–2020) data sets, with a $$^{11}$$ 11 C tagging efficiency of $$\sim 90$$ ∼ 90  % and $$\sim $$ ∼  63–66 % of the exposure surviving the tagging. We present also a novel technique that targets specifically $$^{11}$$ 11 C produced in high-multiplicity during major spallation events. Such $$^{11}$$ 11 C appear as a burst of events, whose space-time correlation can be exploited. Burst identification can be combined with the TFC to obtain about the same tagging efficiency of $$\sim 90\%$$ ∼ 90 % but with a higher fraction of the exposure surviving, in the range of $$\sim $$ ∼  66–68 %.

scholarly journals Sterile neutrinos and future solar neutrino experiments

1994 ◽  
Vol 320 (3-4) ◽  
pp. 323-328 ◽  
Author(s):  
S.M. Bilenky ◽  
C. Giunti
Keyword(s):  
Solar Neutrino ◽  
Sterile Neutrinos ◽  
Neutrino Experiments

scholarly journals Challenge to anomalous phenomena in solar neutrino

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Y. H. Ahn
Keyword(s):  
Solar Neutrino ◽  
Transition Probability ◽  
Solar Neutrinos ◽  
Current Data ◽  
Sinusoidal Oscillation ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
Extended Theory ◽  
Matter Effect ◽  
Neutrino Experiments

Abstract We suggest a would-be solution to the solar neutrino tension why solar neutrinos appear to mix differently from reactor antineutrinos, in theoretical respect. To do that, based on an extended theory with light sterile neutrinos added we derive a general transition probability of neutrinos born with one flavor tuning into a different flavor. Three new mass-squared differences are augmented in the extended theory: $$ \Delta {m}_{\mathrm{ABL}}^2\lesssim \mathcal{O}\left({10}^{-11}\right) $$ Δ m ABL 2 ≲ O 10 − 11 eV2 optimized at astronomical-scale baseline (ABL) oscillation experiments and one $$ \Delta {m}_{\mathrm{SBL}}^2\lesssim \mathcal{O}(1) $$ Δ m SBL 2 ≲ O 1 eV2 optimized at reactor short-baseline (SBL) oscillation experiments. With a so-called composite matter effect that causes a neutrino flavor change via the effects of sinusoidal oscillation including the Mikheyev-Smirnov-Wolfenstein matter effect, we find that the value of ∆m2 measured from reactor antineutrino experiments can be fitted with that from the 8B solar neutrino experiments for roughly $$ \Delta {m}_1^2\lesssim {10}^{-13} $$ Δ m 1 2 ≲ 10 − 13 eV2 and $$ \Delta {m}_2^2\simeq \mathcal{O}\left({10}^{-11}\right) $$ Δ m 2 2 ≃ O 10 − 11 eV2. Nonetheless, we find that the current data (solar neutrino alone) is not precise enough to test the proposed scenario. Future precise measurements of 8B and pep solar neutrinos may confirm and/or improve the value of $$ \Delta {m}_2^2 $$ Δ m 2 2 .

A LIQUID ARGON OR XENON DETECTOR TO OBSERVE A NEUTRINO MAGNETIC MOMENT OF μν~10−11μB

1992 ◽  
Vol 07 (17) ◽  
pp. 4167-4173
Author(s):  
DAVID B. CLINE ◽  
WOOPYO HONG
Keyword(s):  
Magnetic Moment ◽  
Solar Neutrino ◽  
Liquid Argon ◽  
Current Situation ◽  
Low Energy ◽  
Electron Drift ◽  
Neutrino Magnetic Moment ◽  
Experimental Search ◽  
Energy Neutrino ◽  
Neutrino Experiments

We describe the current situation in the search for a finite magnetic moment. Solar neutrino experiments can be interpreted in terms of a neutrino magnetic moment of ~10−10−10−11μB. Other astrophysical constraints are very model-dependent. We then describe a technique to detect a magnetic moment using neutrinos from a reactor or low energy neutrino facility and a cryogenic electron drift detector with a mass in the range of 1–5 tons. Background estimates are also given for an experimental search. We estimate that a neutrino magnetic moment down to 4×10−11μB can be searched for with this technique. We consider both argon and xeuon to be suitable detector components.

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