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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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First Direct Measurement of ^{22}Mg(α,p)^{25}Al and Implications for X-Ray Burst Model-Observation Comparisons.

J S Randhawa1,2, Y Ayyad1, W Mittig1,3

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.

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We directly measured the ^{22}Mg(α,p) nuclear reaction rate, crucial for understanding neutron star properties. Our findings indicate a significantly higher rate, suggesting less compact neutron stars in systems like GS1826-24.

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Area of Science:

  • Nuclear astrophysics
  • X-ray astronomy
  • Neutron star physics

Background:

  • Type-I X-ray bursts are vital for probing accreting neutron star properties.
  • Astrophysical models of these bursts depend on precise nuclear reaction rates.
  • The ^{22}Mg(α,p) reaction rate is a key uncertainty in current models.

Purpose of the Study:

  • To directly measure the ^{22}Mg(α,p) nuclear reaction rate.
  • To improve the accuracy of astrophysical models for Type-I X-ray bursts.
  • To refine constraints on neutron star properties.

Main Methods:

  • Utilized an Active Target Time Projection Chamber for direct reaction measurement.
  • Measured the cross-section of the ^{22}Mg(α,p) reaction.
  • Calculated the astrophysical reaction rate based on experimental data.

Main Results:

  • The first direct measurement of the ^{22}Mg(α,p) reaction rate was achieved.
  • The measured astrophysical reaction rate is orders of magnitude higher than previously estimated.
  • This new rate impacts the interpretation of observational data from X-ray bursts.

Conclusions:

  • The enhanced ^{22}Mg(α,p) reaction rate suggests a revision of neutron star models.
  • A higher reaction rate implies a less-compact neutron star for the source GS1826-24.
  • This work highlights the importance of direct nuclear measurements for astrophysical understanding.