Abstract:The reaction v (d, 2n) e+ has been observed using antineutrinos from a powerful fission reactor. The ineasured crosssection G = 3.0 1. 1.5 x 10-4.5 cnf/fission ve is consistent with exp expectations, a. 2.4 4 0.•4 x 10-45 cin2/fission 5,e, based on theory the two cornpone,it neutrino theory and elementary considerations regarding the structure of the deuteron. .-Supported in part by the.United States Atomic Energy Comrnission
“…Accordingly, the attainable accuracies in both channels are limited only by the uncertainties of the high energy part of φ(ν e ), which is about 5%. These uncertainties are better than the experimental errors [36] achieved at present.…”
Section: Neutrino Interactions On Nucleimentioning
confidence: 54%
“…The charged-and neutral-current interactions on deuteron have been experimentally measured [36], while neutral-current excitations have been studied theoretically [37]. Theν e N charged-current interactions have also been discussed in connection to the detection of low energyν e from the Earth [38].…”
Section: Neutrino Interactions On Nucleimentioning
The low energy part of the reactor neutrino spectra has not been measured experimentally. Its uncertainties limit the sensitivities in certain reactor neutrino experiments. This article discusses the origin of these uncertainties and examines their effects on the measurements of neutrino interactions with electrons and nuclei. The discrepancies between previous results and the Standard Model expectations can be explained by the under-estimation of the reactor neutrino spectra at low energies. To optimize the experimental sensitivities, measurements forν e -e cross-sections should focus on events with large (>1.5 MeV) recoil energy while those for neutrino magnetic moment searches should emphasize on events <100 keV. The merits and attainable accuracies for neutrino-electron scattering experiments using artificial neutrino sources are discussed.
“…Accordingly, the attainable accuracies in both channels are limited only by the uncertainties of the high energy part of φ(ν e ), which is about 5%. These uncertainties are better than the experimental errors [36] achieved at present.…”
Section: Neutrino Interactions On Nucleimentioning
confidence: 54%
“…The charged-and neutral-current interactions on deuteron have been experimentally measured [36], while neutral-current excitations have been studied theoretically [37]. Theν e N charged-current interactions have also been discussed in connection to the detection of low energyν e from the Earth [38].…”
Section: Neutrino Interactions On Nucleimentioning
The low energy part of the reactor neutrino spectra has not been measured experimentally. Its uncertainties limit the sensitivities in certain reactor neutrino experiments. This article discusses the origin of these uncertainties and examines their effects on the measurements of neutrino interactions with electrons and nuclei. The discrepancies between previous results and the Standard Model expectations can be explained by the under-estimation of the reactor neutrino spectra at low energies. To optimize the experimental sensitivities, measurements forν e -e cross-sections should focus on events with large (>1.5 MeV) recoil energy while those for neutrino magnetic moment searches should emphasize on events <100 keV. The merits and attainable accuracies for neutrino-electron scattering experiments using artificial neutrino sources are discussed.
“…Subsequently, there were several generations of oscillation experiments with reactor neutrinos that relied on this interaction. In addition, neutrino-induced charged-current processes were observed through the disintegration of the deuteron with reactorν e [15] and in the SNO experiment for solar ν e [16]. For heavy nuclei, charged-current interactions were observed only in solar ν e through radiochemical experiments on 35 Cl [18] and 71 Ga [19].…”
The 73 Ge * (1/2 − ) metastable state decays with a very characteristic signature which allows it to be tagged event-by-event. Studies were performed using data taken with a high-purity germanium detector in a low-background laboratory near a nuclear power reactor core where theν e -flux was 6.4 × 10 12 cm −2 s −1 . The measured average and equilibrium production rates of 73 Ge * (1/2 − ) were (8.7 ± 0.4) and (6.7 ± 0.3) kg −1 day −1 , respectively. The production channels were studied and identified. By studying the difference in the production of 73 Ge * (1/2 − ) between the reactor ON and OFF spectra, limiting sensitivities in the range of ∼ 10 −42 − 10 −43 cm 2 for the cross sections of neutrino-induced nuclear transitions were derived. The dominant background are due to β − decays of cosmic-ray induced 73 Ga. The prospects of enhancing the sensitivities at underground locations are discussed.
“…The interactions CC : νe + d → e + + n + n and NC : νe + d → νe + p + n have been observed [9], and calculated [10,11]. Improved measurements will be of interest, especially since the NC reaction is the detection channel adopted by the forthcoming SNO experiment [12] for solar neutrino detection.…”
Section: Neutrino Charged and Neutral Currents On Deuteronmentioning
A Collaboration comprising Taiwan and mainland Chinese scientists has been built up since 1996 to pursue a experimental program in neutrino and astro-particle physics in Taiwan. A pilot experiment to be performed at the Nuclear Power Station II in Taiwan is now under intense preparation. It will make use of a 600 kg CsI(Tl) crystal calorimeter to study various neutrino interactions. The feasibility of performing a long baseline reactor neutrino experiment will also be investigated. The conceptual design and the physics to be addressed by the pilot experiment are presented.
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