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Radiative Width of the Hoyle State from γ-Ray Spectroscopy.

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Researchers measured the radiative branching ratio of the Hoyle state in carbon-12, yielding a radiative width 34% higher than previously adopted values. This finding impacts stellar evolution and nucleosynthesis models.

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Area of Science:

  • Nuclear Physics
  • Astrophysics
  • Quantum Mechanics

Background:

  • The Hoyle state in carbon-12 (¹²C) is crucial for understanding stellar nucleosynthesis, particularly the triple-alpha process.
  • Accurate determination of its properties, like radiative width, is essential for refining astrophysical models.

Purpose of the Study:

  • To precisely measure the radiative branching ratio of the Hoyle state in ¹²C.
  • To determine the radiative width of the Hoyle state using experimental data and existing values.
  • To assess the impact of the new radiative width on stellar evolution models.

Main Methods:

  • Excitation of the Hoyle state in ¹²C via the ¹²C(p,p') reaction at 10.7 MeV proton energy.
  • Measurement of cascading 3.21 and 4.44 MeV electric quadrupole transitions.
  • Analysis of proton-gamma-gamma triple coincidence data to determine the radiative branching ratio.

Main Results:

  • Observed cascading electric quadrupole transitions from the Hoyle state in ¹²C.
  • Obtained a radiative branching ratio Γ_{rad}/Γ = 6.2(6)×10⁻⁴.
  • Determined the radiative width of the Hoyle state as Γ_{rad} = 5.1(6)×10⁻³ eV, approximately 34% higher than previously accepted values.

Conclusions:

  • The experimentally determined radiative width of the Hoyle state is significantly higher than current estimates.
  • This revised value necessitates adjustments in models of stellar evolution and nucleosynthesis.
  • Further investigation into the Hoyle state's properties may refine our understanding of carbon production in stars.