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.

Can photoionization effects explain the solar-neutrino problem?

1995 ◽  
Vol 73 (1-2) ◽  
pp. 53-58
Author(s):  
J. G. Hykawy
Keyword(s):  
Solar Neutrino ◽  
Initial Conditions ◽  
Neutrino Flux ◽  
New Physics ◽  
Solar Neutrino Problem ◽  
Solar Neutrino Flux ◽  
Accretion Model ◽  
Neutrino Fluxes ◽  
Neutrino Experiments ◽  
Good Agreement

In a simple accretion model of the Sun, the inclusion of photoionizationlike phenomena leads to a set of initial conditions for solar burning that mimic a combination of the classic low-Z and high-Y models. When such initial conditions are used as input to the standard SunEV code, the predicted neutrino fluxes are in good agreement with those presently being observed in the Kamiokande, SAGE and GALLEX experiments. No new physics is required. It is possible that the combination of a low-Z and high-Y model, which is able to explain the solar neutrino deficit, might also provide good agreement with the presently observed helioseismic data. If data from the planned next generation of solar-neutrino experiments (e.g., SNO, SuperKamiokande) shows that the Mikheyer–Smirnov–Wolfenstein effect is not the solution to the solar-neutrino problem, experiments measuring the low-energy solar neutrino flux might show that a low-Z, high-Y combination model is valid.

RECENT SOLAR NEUTRINO OBSERVATIONS AND RESONANT NEUTRINO MIXING

1991 ◽  
Vol 06 (01) ◽  
pp. 15-20 ◽  
Author(s):  
T. K. KUO ◽  
JAMES PANTALEONE
Keyword(s):  
Solar Neutrino ◽  
Neutrino Oscillations ◽  
Large Angle ◽  
Solar Model ◽  
Neutrino Mixing ◽  
Standard Solar Model ◽  
Solar Neutrino Problem ◽  
Neutrino Experiments ◽  
Good Agreement

The results of recent data from the 37 Cl , Kamiokande-II (K-II) and 71 Ga solar neutrino experiments are quantitatively analyzed. The results suggest that non-standard neutrino properties, instead of a non-standard solar model, are the correct explanation for the "solar neutrino problem." Assuming resonant neutrino oscillations, it is found that the "non-adiabatic" and "large angle" solutions are in quite good agreement with the data. The implications of these solutions for forthcoming solar neutrino experiments are discussed.

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.

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.

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.

scholarly journals Volcanology and new geophysics: reality and prospects for example Yellowstone volcano

2019 ◽  
pp. 25-35
Author(s):  
O. B. Khavroshkin ◽  
S. A. Fedotov ◽  
V. V. Tsyplakov ◽  
A. N. Boiko
Keyword(s):  
Solar System ◽  
Detailed Analysis ◽  
Volcanic Activity ◽  
Solar Neutrino ◽  
Strong Influence ◽  
Open Systems ◽  
Neutrino Flux ◽  
Solar Neutrino Flux ◽  
New Geophysics ◽  
Neutrino Fluxes

The dynamic portrait of Yellowstone volcano activity in the form of detailed analysis of key parameters and in real time is presented. Some preliminary findings show that active volcanoes are energetically open systems with a strong influence of the external astrophysical component, primarily solar muon and neutrino fluxes. This should be taken into account when predicting their activity. The astrophysical component of activity may be one of the main mechanisms synchronizing the state of supervolcanoes. The astrophysical component of volcanic activity can exist in other volcanoes of the terrestrial planets of the Solar system, which also experience the synchronizing effects of the solar neutrino flux, that is, the planets of the Solar system can be found to have common rhythms of volcanic activity.

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.

scholarly journals Investigating Sterile Neutrino Flux in the Solar Neutrino Data

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Ankush ◽  
Rishu Verma ◽  
Gazal Sharma ◽  
B. C. Chauhan
Keyword(s):  
Solar Neutrino ◽  
Particle Physics ◽  
Sterile Neutrino ◽  
Neutrino Flux ◽  
Solar Neutrinos ◽  
Neutrino Energy ◽  
Fourth Degree ◽  
Solar Neutrino Flux ◽  
Neutrino Experiments ◽  
Solar Phase

There are compelling evidences for the existence of a fourth degree of freedom of neutrinos, i.e., sterile neutrino. In the recent studies the role of sterile component of neutrinos has been found to be crucial, not only in particle physics, but also in astrophysics and cosmology. This has been proposed to be one of the potential candidates of dark matter. In this work we investigate the updated solar neutrino data available from all the relevant experiments including Borexino and KamLAND solar phase in a model independent way and obtain bounds on the sterile neutrino component present in the solar neutrino flux. The mystery of the missing neutrinos is further deepening as subsequent experiments are coming up with their results. The energy spectrum of solar neutrinos, as predicted by Standard Solar Models (SSM), is seen by neutrino experiments at different parts as they are sensitive to various neutrino energy ranges. It is interesting to note that more than 98% of the calculated standard model solar neutrino flux lies below 1 MeV. Therefore, the study of low energy neutrinos can give us better understanding and the possibility of knowing about the presence of antineutrino and sterile neutrino components in solar neutrino flux. As such, this work becomes interesting as we include the data from medium energy (~1 MeV) experiments, i.e., Borexino and KamLAND solar phase. In our study we retrieve the bounds existing in literature and rather provide more stringent limits on sterile neutrino (νs) flux available in solar neutrino data.

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