LAST HOPE for an astrophysical solution to the solar neutrino problem

Berezinsky, V.; Fiorentini, G.; Lissia, M.

doi:10.1016/0370-2693(95)01241-9

Cited by 39 publications

(23 citation statements)

References 22 publications

(55 reference statements)

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“…With either of these theoretical cross sections, R is consistent with 1.0, which implies that the extraction efficiency of 71 Ge atoms produced in Ga by the neutrinos from 51 Cr is the same as that of natural Ge carrier.…”

supporting

confidence: 65%

“…An experiment using a 517 kCi 51 Cr neutrino source [20,21] began in late December of 1994 and continued until May 1995. We refer to all data after January 1995 as SAGE III, with a special designation of SAGE III.1 for solar neutrino extractions during the Cr experiment.…”

Section: B Extraction Historymentioning

confidence: 99%

“…The most direct experiment of this type involved the irradiation of Ga with the 747-keV neutrinos from an artificial source of 51 Cr [20,21]. Eight exposures of 13 tons of Ga were made to a 517 kCi 51 Cr source.…”

mentioning

confidence: 99%

“…Eight exposures of 13 tons of Ga were made to a 517 kCi 51 Cr source. The 71 Ge atoms were extracted by our usual chemical procedure and their number determined by counting.…”

mentioning

confidence: 99%

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Measurement of the solar neutrino capture rate with gallium metal

Abdurashitov¹,

Гаврин²,

Girin³

et al. 1999

Phys. Rev. C

503

182

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supporting

confidence: 65%

Section: B Extraction Historymentioning

confidence: 99%

mentioning

confidence: 99%

“…Eight exposures of 13 tons of Ga were made to a 517 kCi 51 Cr source. The 71 Ge atoms were extracted by our usual chemical procedure and their number determined by counting.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Measurement of the solar neutrino capture rate with gallium metal

Abdurashitov¹,

Гаврин²,

Girin³

et al. 1999

Phys. Rev. C

503

182

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“…The probability of this result being obtained from a physically-realizable set of fluxes (i.e. with the 7 Be + CNO flux being nonnegative) is less than 2%, and quantifies directly, for example, the "last hope" suggested by Berezinsky et al [27].…”

Section: +022mentioning

confidence: 99%

Probability of a Solution to the Solar Neutrino Problem within the Minimal Standard Model

Heeger

Robertson

1996

Phys. Rev. Lett.

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Tests, independent of any solar model, can be made of whether solar neutrino experiments are consistent with the minimal Standard Model (stable, massless neutrinos). If the experimental uncertainties are correctly estimated and the sun is generating energy by light-element fusion in quasi-static equilibrium, the probability of a standard-physics solution is less than 2%. Even when the luminosity constraint is abandoned, the probability is not more than 4%. The sensitivity of the conclusions to input parameters is explored. . The spectral shape of each individual component, whether line or continuum, is determined by laboratory measurement and/or electroweak theory. Its relative intensity, on the other hand, depends delicately on astrophysical models of the sun. The fact that these models predicted to within a factor of two the intensity of a 0.01% branch ( 8 B) that varies as the 25th power [2] of the central temperature of the sun must be regarded as a stunning achievement and a clear indication of the basic correctness of our understanding of how the sun and other stars function.Nonetheless, the lack of perfect agreement raised speculation about possible exotic origins, such as neutrino oscillations. At first, the model dependence of the 8 B flux calculation made such speculations interesting but not compelling. Now, however, steadily improving data from 4 independent experiments are available. The Homestake Cl-Ar experiment [3] Because the three types of experiment have different energy thresholds, a coarse neutrino spectroscopy of the sun has been made. The least model-dependent questions that can be asked are,Is it possible to describe the neutrino spectrum with any combination of the known sources in hydrogen-burning?Is the total neutrino flux consistent with the solar luminosity?Many have considered model-independent analyses [9-17]; in particular, Hata et al. [13] showed the data to be inconsistent with hydrogen burning and the luminosity constraint without new physics. To this body of analysis we add (a) a test of consistency free of the luminosity constraint, (b) a test for inconsistency of the data with the total solar luminosity, (c) the probabilities that the existing data would be obtained from true values in the physical regime in the absence of new physics, and (d) the dependence of the conclusions on the neutrino cross sections.The spectral shape and endpoint of the neutrino data from Kamiokande show that 8 B neutrinos are emitted from the sun and that hep neutrinos are, as expected, negligible. The pep reaction rate we take to be a fixed fraction, f pep = 0.23(2)%, of the pp rate, [18,19] (while in principle model-dependent, f pep is one of the most reliably determined model parameters, depending chiefly on the electron density and only weakly on temperature and on nuclear wavefunctions [1]). The 7 Be and CNO fluxes play a qualitatively interchangeable role in the existing experiments -the Cl-Ar and Ga experiments are sensitive to both and Kamiokande to neither. As a result, it is possible to ...

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Experimental Results on Neutrino Masses and Lepton Mixing

Brünner

1997

Fortschr. Phys.

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The experimental status of measurements of neutrino masses and lepton avour mixing is summarised. Limits of mass and mixing parameters obtained by dierent experimental techniques are given and the possibilities and limits of the dierent methods are discussed. Future projects are presented and their ability to verify existing results or to explore further regions of the mass and mixing parameter space is discussed.

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LAST HOPE for an astrophysical solution to the solar neutrino problem

Cited by 39 publications

References 22 publications

Measurement of the solar neutrino capture rate with gallium metal

Measurement of the solar neutrino capture rate with gallium metal

Probability of a Solution to the Solar Neutrino Problem within the Minimal Standard Model

Experimental Results on Neutrino Masses and Lepton Mixing

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