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.

The Kamiokande Solar Neutrino Experiment

1990 ◽  
Vol 121 ◽  
pp. 179-186 ◽  
Author(s):  
K. S. Hirata ◽  
T. Kajita ◽  
T. Kifune ◽  
K. Kihara ◽  
M. Nakahata ◽  
...  
Keyword(s):  
Solar Neutrino ◽  
Background Level ◽  
Solar Neutrinos ◽  
Solar Model ◽  
Neutrino Experiment ◽  
Standard Solar Model ◽  
Measured Flux ◽  
Analysis Methods ◽  
Time Period ◽  
Solar Neutrino Experiment

AbstractThe observation of 8B solar Neutrinos in the Kamiokande-II detector is presented. Based on 450 days of data in the time period of January 1987 through May 1988, the measured flux obtained with Ee ≥ 9.3 MeV was 0.46 ± 0.13 (stat) ± 0.08 (sys) of the value predicted by the standard solar model. The detector and analysis methods were improved since June 1988 and the background level has been decreased by a factor of about three since then.

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.

A STATISTICAL ANALYSIS OF THE CHLORINE SOLAR NEUTRINO EXPERIMENT

1991 ◽  
Vol 06 (13) ◽  
pp. 2347-2360 ◽  
Author(s):  
HIROSHI NUNOKAWA ◽  
HISAKAZU MINAKATA
Keyword(s):  
Statistical Analysis ◽  
Solar Neutrino ◽  
Statistical Significance ◽  
Neutrino Flux ◽  
Sunspot Activity ◽  
Neutrino Experiment ◽  
Present Stage ◽  
Solar Neutrino Flux ◽  
New Type ◽  
Solar Neutrino Experiment

A detailed analysis is performed so as to reveal the statistical significance of the possible anticorrelation between the solar neutrino flux, measured by the 37 Cl experiment, and the sunspot activity. We find that the new data added since 1986 do contribute to improving the significance of the anticorrelation. However, we also observe that the statistical significance depends upon the treatment of errors rather sensitively. Therefore, we conclude that the anticorrelation is not definitively established at the present stage of the experiment. We also point out the possibility of a new type of correlation.

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.

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.

IMPLICATIONS OF THE RECENT SOLAR NEUTRINO EXPERIMENT FOR PARTICLE PHYSICS

1991 ◽  
Vol 06 (08) ◽  
pp. 645-657 ◽  
Author(s):  
M. FUKUGITA ◽  
T. YANAGIDA
Keyword(s):  
Time Variation ◽  
Solar Neutrino ◽  
Particle Physics ◽  
Neutrino Flux ◽  
The Other ◽  
Data Sets ◽  
Neutrino Experiment ◽  
Physics Model ◽  
Neutrino Experiments ◽  
Solar Neutrino Experiment

Physical implications of the results of recent solar neutrino experiments from the Homestake, Kamioka and Baksan Laboratories are discussed. We argue that the results from Homestake and Kamioka, if the two data sets are combined, strongly suggest some unusual neutrino properties rather than the modification of astrophysical models of the sun. If the time variation of neutrino captures, as observed at Homestake, is a statistical fluke, the neutrino conversion in matter proposed by Mikheyev and Smirnov among several possibilities yields the most attractive explanation for the neutrino flux deficit. We remark that the solution includes the possibility predicted by simple SO(10) models and it is tested by the gallium experiment. If the time variation at Homestake is true, on the other hand, one must explain why such an effect is not seen at Kamiokande. We stress that it is still possible to make a particle physics model which explains the two apparently contradictory observations.

TIME VARIATION OF SOLAR NEUTRINO FLUX

1993 ◽  
Vol 08 (21) ◽  
pp. 1961-1968 ◽  
Author(s):  
PROBHAS RAYCHAUDHURI
Keyword(s):  
Solar Activity ◽  
Solar Neutrino ◽  
Neutrino Flux ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Neutrino Experiment ◽  
Sunspot Maximum ◽  
Solar Neutrino Flux ◽  
Activity Cycles ◽  
Neutrino Experiments

Considering the solar neutrino data during the period from June, 1989 to April, 1992 within first sunspot maximum (it coincides with the maximum of the sunspot (Wolf numbers) and second sunspot maximum (usually appears 2–3 years after the first sunspot maximum) from the four solar neutrino experiments (37 Cl radiochemical, SAGE I & II, Gallex, Kamiokande II & III) we see that the average solar neutrino flux is much higher at the second sunspot maximum (May, 1991 to April, 1992) than at the first sunspot maximum (June, 1989 to April, 1991). This type of observation is already observed in the previous two solar activity cycles in 37 Cl solar neutrino experiment. It has been known for many years that first sunspot maximum and second sunspot maximum are essential features of the solar activity cycle. The above observation suggests that the solar neutrino flux data from the solar neutrino experiments appear to be varying with the solar activity cycle which suggests that the solar activity cycle is due to the pulsating character of the nuclear energy generation inside the core of the Sun.

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.

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