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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Instrument for precision long-term β-decay rate measurements.

M J Ware1, S D Bergeson1, J E Ellsworth1

  • 1Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA.

The Review of Scientific Instruments
|August 3, 2015
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Summary
This summary is machine-generated.

This study details a precision setup for measuring beta-decay rates, crucial for testing annual variation claims. The controlled environment minimizes external influences, ensuring accurate radioactive decay rate data.

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Area of Science:

  • Nuclear Physics
  • Experimental Physics

Background:

  • Precision measurements of radioactive decay rates are essential for fundamental physics research.
  • Recent claims suggest small annual variations in decay rates, necessitating highly stable experimental conditions.

Purpose of the Study:

  • To describe a novel experimental setup for precise relative beta-decay rate measurements.
  • To evaluate the impact of environmental factors on decay rate measurements.
  • To provide data for testing hypotheses of annual variations in nuclear decay rates.

Main Methods:

  • Utilized automated sample changers with high spatial precision for positioning radioactive samples.
  • Employed Geiger-Müller (GM) tubes and NaI scintillators as detector sets.
  • Housed the apparatus in a sealed chamber with controlled pressure, humidity, and temperature to mitigate environmental variations.

Main Results:

  • Achieved low statistical uncertainties: few times 0.01% per day for GM detectors and ~0.01% per hour for NaI detectors.
  • Demonstrated that uncontrolled atmospheric pressure variations can induce a 0.1% annual signal in GM detector count rates.
  • Showed that NaI scintillator detector count rates are not discernibly influenced by natural pressure or plausible temperature variations.

Conclusions:

  • The developed experimental setup provides high precision for beta-decay rate measurements.
  • Environmental stabilization is critical for detecting subtle variations in decay rates, particularly for GM detectors.
  • NaI scintillators offer superior stability against common environmental fluctuations compared to GM tubes.