The astrophysically important <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mn>3</mn></mrow><mrow><mo>+</mo></mrow></msup></mrow></math> state in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>18</mn></mrow></msup></mrow><mi mathvariant="normal">Ne</mi></math> and the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>17</mn></mrow></msup></mrow><mi mathvariant="normal">F</mi><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mrow><msup><mrow><mo>)</mo></mrow><mrow><mn>18</mn></mrow></msup></mrow><mi mathvariant="normal">Ne</mi></math> stellar rate

D. W. Bardayan; J. C. Blackmon; C. R. Brune; A. E. Champagne; A. A. Chen; J. M. Cox; T. Davinson; V. Y. Hansper; M. A. Hofstee; B. A. Johnson; R. L. Kozub; Z. Ma; P. D. Parker; D. E. Pierce; M. T. Rabban; A. C. Shotter; M. S. Smith; K. B. Swartz; D. W. Visser; P. J. Woods

doi:10.1103/PhysRevC.62.055804

The astrophysically important $3^{+}$ state in $^{18} Ne$ and the $^{17} F (p, γ)^{18} Ne$ stellar rate

D. W. Bardayan, J. C. Blackmon, C. R. Brune, A. E. Champagne, A. A. Chen, J. M. Cox, T. Davinson, V. Y. Hansper, M. A. Hofstee, B. A. Johnson, R. L. Kozub, Z. Ma, P. D. Parker, D. E. Pierce, M. T. Rabban, A. C. Shotter, M. S. Smith, K. B. Swartz, D. W. Visser, and P. J. Woods

Phys. Rev. C 62, 055804 – Published 19 October 2000

Abstract

Knowledge of the $^{17} F (p, γ)^{18} Ne$ reaction rate is important for understanding stellar explosions, but it was uncertain because the properties of an expected but previously unobserved $3^{+}$ state in $^{18} Ne$ were not known. This state would provide a strong s-wave resonance for the $^{17} F + p$ system and, depending on its excitation energy, could dominate the stellar reaction rate at temperatures above 0.2 GK. We have observed this missing $3^{+}$ state by measuring the $^{1} H (^{17} F {, p)}^{17} F$ excitation function with a radioactive $^{17} F$ beam at the ORNL Holifield Radioactive Ion Beam Facility (HRIBF). We find that the state lies at a center-of-mass energy of $E_{r} = 599.8 \pm {1.5}_{stat} \pm {2.0}_{sys}$ keV ${(E}_{x} = 4523.7 \pm 2.9 keV)$ and has a width of $Γ = 18 \pm 2_{stat} \pm 1_{sys} keV .$ The measured properties of the resonance are only consistent with a $J^{π} {= 3}^{+}$ assignment.

Received 19 June 2000

DOI:https://doi.org/10.1103/PhysRevC.62.055804

Authors & Affiliations

D. W. Bardayan^1,2,*, J. C. Blackmon¹, C. R. Brune³, A. E. Champagne³, A. A. Chen², J. M. Cox⁴, T. Davinson⁵, V. Y. Hansper^1,3,†, M. A. Hofstee⁶, B. A. Johnson⁴, R. L. Kozub⁴, Z. Ma^1,7,8, P. D. Parker², D. E. Pierce¹, M. T. Rabban¹, A. C. Shotter⁵, M. S. Smith¹, K. B. Swartz², D. W. Visser², and P. J. Woods⁵

¹Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
²A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8124
³Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599
⁴Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505
⁵Department of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
⁶Department of Physics, Colorado School of Mines, Golden, Colorado 80401
⁷Chinese Institute for Atomic Energy, Beijing 102413, People’s Republic of China
⁸Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831

^*Present address: Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599.
^†Present address: Institute of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark.

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Vol. 62, Iss. 5 — November 2000

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