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Thomson's e/m Experiment

In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
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Related Experiment Video

Updated: Jul 12, 2026

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
11:38

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment

Published on: December 3, 2019

Solar neutrinos: proposal for a new test.

M S Freedman, C M Stevens, E P Horwitz

    Science (New York, N.Y.)
    |September 17, 1976
    PubMed
    Summary

    The predicted flux of solar neutrinos remains undetected, challenging nuclear fusion theories. Detecting low-energy neutrinos via lead-205 in thallium minerals offers a new experimental approach.

    Area of Science:

    • Astrophysics
    • Nuclear Physics
    • Geochemistry

    Background:

    • The flux of solar neutrinos reaching Earth is not yet detected.
    • This lack of detection challenges established theories of solar energy production via nuclear fusion.
    • A significant low-energy component of the solar neutrino flux is hypothesized.

    Purpose of the Study:

    • To propose a novel method for detecting the elusive low-energy solar neutrino flux.
    • To address the discrepancy between theoretical predictions and experimental observations of solar neutrinos.
    • To solicit expert comments on a proposed detection technique.

    Main Methods:

    • Utilizing mass-spectrometric assay for detection.
    • Analyzing the induced concentration of lead-205 (a long-lived isotope).

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    Scattering And Absorption of Light in Planetary Regoliths

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  • Employing ancient thallium minerals as the detection medium.

    • Main Results:

    • The proposed method targets the detection of lead-205, an isotope induced by low-energy solar neutrinos.
    • The concentration of lead-205 is expected to be minute (1.6 x 10^7 years half-life).
    • Successful detection would validate the existence of the predicted solar neutrino flux.

    Conclusions:

    • The detection of lead-205 in thallium minerals presents a viable, albeit challenging, pathway to confirm solar neutrino flux.
    • This experimental approach could resolve current inconsistencies in solar fusion models.
    • Interdisciplinary collaboration is crucial for advancing this research.