Status of the Soviet-American gallium experiment

1994 ◽  
Vol 346 (1678) ◽  
pp. 15-21
Keyword(s):  
Solar Neutrino ◽  
Neutrino Flux ◽  
Solar Model ◽  
Data Sets ◽  
The Sun ◽  
Standard Solar Model ◽  
Baksan Neutrino Observatory ◽  
A Value ◽  
Solar Neutrino Flux

A radiochemical 71 Ga- 71 Ge experiment to determine the primary flux of neutrinos from the Sun began measurements of the solar neutrino flux at the Baksan Neutrino Observatory in 1990. The number of 71 Ge atoms extracted from 30 tons of gallium in 1990 and from 57 tons of gallium in 1991 was measured in 12 runs during the period of January 1990 to December 1991. The combined 1990 and 1991 data-sets give a value of 58 + 17/ —24 (stat) ± 14 (syst) SNU. This is to be compared with 132 + 7/ —5 SNU predicted by the Standard Solar Model.

MEASUREMENT OF 8B SOLAR NEUTRINO FLUX AND ENERGY SPECTRUM AT SUPER-KAMIOKANDE

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 721-723
Author(s):  
GENE GUILLIAN
Keyword(s):  
Energy Spectrum ◽  
Electron Energy ◽  
Solar Neutrino ◽  
Neutrino Flux ◽  
Electron Energy Spectrum ◽  
Solar Model ◽  
Standard Solar Model ◽  
Spectrum Measurement ◽  
Solar Neutrino Flux ◽  
Night Flux

The latest Super-Kamiokande measurement of 8 B solar neutrino flux and recoil electron energy spectrum are presented. The highlights of our results are the day vs night flux asymmetry, which differs from zero at the 1.3 σ level, and the energy spectrum measurement, which shows no significant distortion compared to the BP98 standard solar model.

scholarly journals Report on the Homestake Chlorine Solar Neutrino Experiment

1990 ◽  
Vol 121 ◽  
pp. 171-177 ◽  
Author(s):  
R. Davis ◽  
K. Lande ◽  
C.K. Lee ◽  
B.T. Cleveland ◽  
J. Ullman
Keyword(s):  
Solar Neutrino ◽  
Capture Rate ◽  
Neutrino Flux ◽  
Solar Model ◽  
Neutrino Experiment ◽  
Standard Solar Model ◽  
Solar Neutrino Flux ◽  
Homestake Mine ◽  
Solar Neutrino Experiment

AbstractA report on the results obtained from the chlorine radiochemical solar neutrino experiment in the Homestake mine, Lead, SD. Over the period 1970-1988 a neutrino capture rate of 2.3 ± 0.3 SNU was observed. This rate is discussed in relation: to the theoretical standard solar model, the results from the Kamiokande II experiment, and variations in the solar neutrino flux.

scholarly journals Theoretical Review of Secular Instabilities in the Sun

1980 ◽  
Vol 5 ◽  
pp. 441-444
Author(s):  
M. Gabriel
Keyword(s):  
Inner Core ◽  
Neutrino Flux ◽  
Radial Oscillation ◽  
Solar Model ◽  
The Sun ◽  
Standard Solar Model ◽  
The Past ◽  
Low Order

In this review we discuss the problems raised by the discovery that the sun was, in the past, unstable towards non-radial oscillations.In 1972, Fowler (1972), in an attempt to explain the low-neutrino flux measured in Davis’ experiment (now 1.6 snu, while the standard solar model predicts 4.4 snu) suggested that the sun could have undergone, some 10 years ago, a change in structure because of sudden mixing of the inner core. During the same year Dilke and Gough (1972) suggested the sun is unstable to low-order gravity modes (g+ modes) of non-radial oscillation and that the mixing is triggered when the amplitude of the oscillation becomes large enough.

ON THE COHERENCE CONDITION FOR RESONANT SPIN-FLAVOR PRECESSION OF MAJORANA SOLAR NEUTRINOS

1992 ◽  
Vol 07 (06) ◽  
pp. 1309-1314
Author(s):  
RAUL HORVAT
Keyword(s):  
Solar Neutrino ◽  
Neutrino Flux ◽  
Majorana Neutrino ◽  
Solar Neutrinos ◽  
Sunspot Activity ◽  
The Sun ◽  
Solar Neutrino Problem ◽  
Mass Eigenstates ◽  
Flavor Changing ◽  
Solar Neutrino Flux

One of the most attractive solutions to the solar-neutrino problem (including an anticorrelation of the solar-neutrino flux with sunspot activity) incorporates a Majorana neutrino having a flavor-changing transition moment as large as (0.1–1)×10−10 Bohr magnetons. This solution is compatible with all known laboratory, astrophysical and cosmological bounds. Here we show the consistency of the solution with the coherence condition for effective-mass eigenstates inside the sun.

On the investigation of the internal structure of the sun by means of neutrino radiation studies

1968 ◽  
Vol 46 (10) ◽  
pp. S491-S493
Author(s):  
V. A. Dergachov ◽  
G. E. Kocharov
Keyword(s):  
Energy Spectrum ◽  
Experimental Determination ◽  
Internal Structure ◽  
Solar Neutrino ◽  
Gravitational Constant ◽  
Neutrino Flux ◽  
The Sun ◽  
Neutrino Radiation ◽  
Solar Neutrino Flux

We consider the possibilities of investigating the internal structure of the sun using the energy spectrum and the intensity of its neutrino radiation. The experimental determination of the solar neutrino flux will permit us to obtain values for some parameters which are important for the theory of the internal structure of the sun (e.g. the time for evolution and the concentrations of various isotopes in the interior). It is also possible to decide whether or not the gravitational constant varies with time.

SOLAR MODELS: AN HISTORICAL OVERVIEW

2003 ◽  
Vol 18 (22) ◽  
pp. 3761-3776 ◽  
Author(s):  
JOHN N. BAHCALL
Keyword(s):  
Solar Neutrino ◽  
Neutrino Flux ◽  
New Physics ◽  
Solar Model ◽  
Historical Overview ◽  
Standard Solar Model ◽  
Solar Luminosity ◽  
Consensus View ◽  
Neutrino Fluxes ◽  
Neutrino Experiments

I will summarize in four slides the 40 years of development of the standard solar model that is used to predict solar neutrino fluxes and then describe the current uncertainties in the predictions. I will dispel the misconception that the p-p neutrino flux is determined by the solar luminosity and present a related formula that gives, in terms of the p-p and 7 Be neutrino fluxes, the ratio of the rates of the two primary ways of terminating the p-p fusion chain. I will also attempt to explain why it took so long, about three and a half decades, to reach a consensus view that new physics is being learned from solar neutrino experiments. Finally, I close with a personal confession and some personal remarks.

TIME VARIATIONS IN KAMIOKANDE SOLAR NEUTRINO DATA

1991 ◽  
Vol 06 (22) ◽  
pp. 2003-2007 ◽  
Author(s):  
PROBHAS RAYCHAUDHURI
Keyword(s):  
Solar Activity ◽  
Solar Neutrino ◽  
Statistical Significance ◽  
Neutrino Flux ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Neutrino Experiment ◽  
The Sun ◽  
Flux Data ◽  
Solar Neutrino Flux

Solar neutrino flux (Eν ≥ 7.5 MeV ) data from 1st January to April 1990 as measured in Kamiokande solar neutrino experiment have been analyzed statistically and have found that the solar neutrino data varies with the solar activity cycle with very high statistical significance (> 98% confidence level). Average solar neutrino flux data in the sunspot minimum range cannot be equal to twice the average solar neutrino flux data in the sunspot maximum range, which suggests that the neutrino flip through the magnetic field of the convection zone of the sun is not responsible for the solar neutrino flux variation. Thus the variation of solar neutrino flux with the solar activity cycle suggests that the solar activity cycle is due to the pulsating character of the nuclear energy generation inside the core of the sun.

SOLAR NEUTRINO FLUX AND SUNSPOT DATA

1988 ◽  
Vol 03 (14) ◽  
pp. 1319-1322 ◽  
Author(s):  
PROBHAS RAYCHAUDHURI
Keyword(s):  
Solar Neutrino ◽  
Nuclear Energy ◽  
Neutrino Flux ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
The Sun ◽  
Sunspot Maximum ◽  
The Core ◽  
Solar Neutrino Flux ◽  
Sunspot Data

It is shown that the sunspot data and the solar neutrino data anticorrelates except for the period of three years after the sunspot maximum. This suggests that the solar activity cycle is due to the pulsating character of the nuclear energy generation inside the core of the sun.

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