Direct measurement of ^18F(α,p)^21Ne cross sections with ANASEN

Abstract

The ¹⁸F(α,p)²¹Ne reaction may impact Asymptotic Giant Branch nucleosynthesis and helium burning on accreting white dwarfs. This reaction has never been directly measured, and constraints from a previous time-inverse measurement leave large uncertainties in the reaction rate. We measured ¹⁸F(α,p)²¹Ne cross sections directly for the first time covering from 2 ≤ E_cm ≤ 4 MeV. Combining these results with previous work and comparisons to statistical model calculations results in a substantial improvement in uncertainties in the reaction rate. Cross sections were measured in inverse kinematics at TRIUMF-ISAC using a radioactive ¹⁸F beam and ANASEN with an extended ⁴He gas target. Protons were detected in arrays of silicon-strip detectors with the measured trajectories and energies allowing reconstruction of the center-of-mass energy and final state in ²¹Ne populated. We found the total cross section is in good agreement with statistical calculations, though population of the second excited state in ²¹Ne is greater than predicted. This direct measurement is combined with the previous time-inverse measurement and a new reaction rate is calculated for 0.1--3 GK. The uncertainties in the ¹⁸F(α,p)²¹Ne reaction rate have been reduced to a sufficient level to allow robust predictions from AGB models. The new recommended rate leads to a 45\% increase in ¹⁹F production compared to the previous rate.

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BibTeX RIS

BibTeX

@misc{davis2026direct,
  title = {{Direct measurement of $^18$F($α,p$)$^21$Ne cross sections with ANASEN}},
  author = {K. S. Davis and J. C. Blackmon and C. M. Deibel and G. L. Wilson and M. Alcorta and L. T. Baby and D. W. Bardayan and S. Carmichael and S. Chakraborty and C. Esparza and J. Glorius and A. I. Karakas and A. Lennarz and B. Kay and J. Henning and G. W. McCann and S. Pain and C. Ruiz and R. Russell and V. Sitaraman and B. Sudarsan and I. Tolstukhin and L. Wagner and I. Wiedenhöver},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.06286},
  eprint = {2609.06286},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.06286},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Direct measurement of ^18F(α,p)^21Ne cross sections with ANASEN
AU  - K. S. Davis
AU  - J. C. Blackmon
AU  - C. M. Deibel
AU  - G. L. Wilson
AU  - M. Alcorta
AU  - L. T. Baby
AU  - D. W. Bardayan
AU  - S. Carmichael
AU  - S. Chakraborty
AU  - C. Esparza
AU  - J. Glorius
AU  - A. I. Karakas
AU  - A. Lennarz
AU  - B. Kay
AU  - J. Henning
AU  - G. W. McCann
AU  - S. Pain
AU  - C. Ruiz
AU  - R. Russell
AU  - V. Sitaraman
AU  - B. Sudarsan
AU  - I. Tolstukhin
AU  - L. Wagner
AU  - I. Wiedenhöver
PY  - 2026
DA  - 2026/09/05
PB  - arXiv
DO  - 10.48550/arxiv.2609.06286
UR  - https://arxiv.org/abs/2609.06286
AB  - The ^18F(α,p)^21Ne reaction may impact Asymptotic Giant Branch nucleosynthesis and helium burning on accreting white dwarfs. This reaction has never been directly measured, and constraints from a previous time-inverse measurement leave large uncertainties in the reaction rate. We measured ^18F(α,p)^21Ne cross sections directly for the first time covering from 2 ≤ E_cm ≤ 4 MeV. Combining these results with previous work and comparisons to statistical model calculations results in a substantial improvement in uncertainties in the reaction rate. Cross sections were measured in inverse kinematics at TRIUMF-ISAC using a radioactive ^18F beam and ANASEN with an extended ^4He gas target. Protons were detected in arrays of silicon-strip detectors with the measured trajectories and energies allowing reconstruction of the center-of-mass energy and final state in ^21Ne populated. We found the total cross section is in good agreement with statistical calculations, though population of the second excited state in ^21Ne is greater than predicted. This direct measurement is combined with the previous time-inverse measurement and a new reaction rate is calculated for 0.1--3 GK. The uncertainties in the ^18F(α,p)^21Ne reaction rate have been reduced to a sufficient level to allow robust predictions from AGB models. The new recommended rate leads to a 45\% increase in ^19F production compared to the previous rate.
ER  -

Direct measurement of ¹⁸F(α,p)²¹Ne cross sections with ANASEN

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