scholarly journals Using Helioseismic Data to Probe the Hydrogen Abundance in the Solar Core

1990 ◽  
Vol 121 ◽  
pp. 327-340 ◽  
Author(s):  
D. O. Gough ◽  
A. G. Kosovichev
Keyword(s):  
Solar Neutrino ◽  
Particle Physics ◽  
Sound Speed ◽  
Main Sequence ◽  
Neutrino Flux ◽  
Sequence Evolution ◽  
The Sun ◽  
Low Degree ◽  
The Standard Model ◽  
Solar Neutrino Flux

AbstractA procedure for inverting helioseismic data to determine the hydrogen abundance in the radiative interior of the sun is briefly described. Using Backus-Gilbert optimal averaging, the variation of sound speed, density and hydrogen abundance in the energy-generating core is estimated from low-degree p-mode frequencies. The result provides some evidence for there having been some redistribution of material during the sun’s main-sequence evolution. The inversion also suggests that the evolutionary age of the sun is perhaps some 10 per cent greater than the generally accepted value, and that the solar neutrino flux, based on standard nuclear and particle physics, is about 75 per cent of the standard-model value.

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.

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.

Solar neutrinos and solar oscillations

1994 ◽  
Vol 346 (1678) ◽  
pp. 37-49 ◽  
Keyword(s):  
Solar Neutrino ◽  
Particle Physics ◽  
Sound Speed ◽  
Solar Neutrinos ◽  
Diagnostic Information ◽  
The Sun ◽  
Solar Oscillations ◽  
Thermonuclear Reactions ◽  
Neutrino Production ◽  
Classical Models

For solar neutrino measurements to contribute directly to particle physics it is essential that we know the structure of the Sun. Only then can we be sure both of the conditions under which the neutrinos are produced and of the state of the material through which they must pass before arriving at the detectors on Earth. Solar oscillations play at least one, and possibly two important roles: firstly, as passive carriers of information about density and sound speed, they provide important diagnostic information which has been used to set quite stringent constraints on the structure of the Sun’s interior; secondly, as active participants in the dynamics of the solar core, it is not out of the question that they induce motion that influences substantially the rates of the various thermonuclear reactions that em it the neutrinos. The basic processes of seismic inference will be discussed briefly, followed by a summary of those inferences that have a bearing on neutrino production. Finally, some of the uncertainties in our understanding of the Sun’s interior will be aired, to restrain the temptation to accept too hastily the details of the simple hydrostatic classical models of 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.

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.

scholarly journals PARTICLE PHYSICS CONFRONTS THE SOLAR NEUTRINO PROBLEM

1992 ◽  
Vol 07 (22) ◽  
pp. 5387-5459 ◽  
Author(s):  
PALASH B. PAL
Keyword(s):  
Magnetic Moment ◽  
Time Variation ◽  
Solar Neutrino ◽  
Particle Physics ◽  
Magnetic Moments ◽  
Neutrino Flux ◽  
The Sun ◽  
Solar Neutrino Problem ◽  
The Earth ◽  
Near Future

This review has four parts. In Part I, we describe the reactions that produce neutrinos in the sun and the expected flux of those neutrinos on the earth. We then discuss the detection of these neutrinos, and how the results obtained differ from the theoretical expectations, leading to what is known as the solar neutrino problem. In Part II, we show how neutrino oscillations can provide a solution to the solar neutrino problem. This includes vacuum oscillations, as well as matter enhanced oscillations. In Part III, we discuss the possibility of time variation of the neutrino flux and how a magnetic moment of the neutrino can explain the phenomenon. We also discuss particle physics models which can give rise to the required values of magnetic moments. In Part IV, we present some concluding remarks and outlook for the near future.

Internal rotation of the Sun and the solar neutrino flux

Nature ◽  
1974 ◽  
Vol 248 (5445) ◽  
pp. 209-211 ◽  
Author(s):  
IAN W. ROXBURGH
Keyword(s):  
Internal Rotation ◽  
Solar Neutrino ◽  
Neutrino Flux ◽  
The Sun ◽  
Solar Neutrino Flux
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