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Radiative Capture on Nuclear Isomers: Direct Measurement of the ^{26m}Al(p,γ)^{27}Si Reaction.

G Lotay1, A Lennarz2,3, C Ruiz2,4

  • 1Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.

Physical Review Letters
|February 11, 2022
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Summary
This summary is machine-generated.

This study measured the ^{26m}Al(p,γ)^{27}Si reaction using a radioactive beam, revealing a key resonance that dominates astrophysical reaction rates. This provides crucial insights into the destruction of isomeric ^{26}Al in cosmic environments.

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Area of Science:

  • Nuclear astrophysics
  • Experimental nuclear physics

Background:

  • Isomeric nuclei, such as ^{26m}Al, play a significant role in stellar nucleosynthesis.
  • Understanding proton capture reactions on excited states is crucial for accurate astrophysical models.
  • Previous measurements of the ^{26m}Al(p,γ)^{27}Si reaction have been limited, leaving uncertainties in nuclear astrophysics.

Purpose of the Study:

  • To perform the first direct measurement of an astrophysical reaction using a radioactive beam of isomeric nuclei.
  • To precisely determine the strength of the 447-keV resonance in the ^{26m}Al(p,γ)^{27}Si reaction.
  • To resolve long-standing issues in nuclear astrophysics concerning reactions on excited quantum levels.

Main Methods:

  • Utilized a radioactive beam of isomeric nuclei for the measurement.
  • Focused on the ^{26m}Al(p,γ)^{27}Si reaction, specifically targeting the 447-keV resonance.
  • Measured the strength of the resonance to be 432_{-226}^{+146} meV.

Main Results:

  • The key 447-keV resonance in the ^{26m}Al(p,γ)^{27}Si reaction was directly measured.
  • This resonance was found to dominate the thermally averaged reaction rate between 0.3 and 2.5 GK.
  • The measurement provides critical data for understanding the destruction of isomeric ^{26}Al.

Conclusions:

  • This work represents a significant advancement in measuring proton capture reactions on excited nuclear states.
  • The findings offer unique insights into the behavior of isomeric ^{26}Al in astrophysical plasmas.
  • Resolves a critical issue in nuclear astrophysics by providing precise experimental data.