Measurement of the <math><mrow><mmultiscripts><mi>Ne</mi><mprescripts/><none/><mn>18</mn></mmultiscripts><mo>(</mo><mi>α</mi><mo>,</mo><mi>p</mi><mo>)</mo><mmultiscripts><mi>Na</mi><mprescripts/><none/><mn>21</mn></mmultiscripts></mrow></math> reaction with the ANASEN active-target detector system at <math><mrow><msub><mi>E</mi><mrow><mi mathvariant="normal">c</mi><mo>.</mo><mi mathvariant="normal">m</mi><mo>.</mo></mrow></msub><mo>=</mo><mn>2.5</mn><mo>–</mo><mn>4</mn></mrow></math> MeV - INSPIRE

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Measurement of the ${}^{18}{Ne} (α, p) {}^{21}{Na}$ reaction with the ANASEN active-target detector system at $E_{c . m .} = 2.5 - 4$ MeV

Jul 23, 2021

11 pages

Published in:

Phys.Rev.C 105 (2022) 5, 055806

Published: May 19, 2022

e-Print:

2107.11498 [nucl-ex]

DOI:

10.1103/PhysRevC.105.055806 (publication)

View in:

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Abstract: (APS)

The

{}^{18}{Ne} (α, p) {}^{21}{Na}

reaction plays a significant role in Type-I X-ray bursts. It is a major path in the breakout from the hot-CNO cycles to the synthesis of heavier elements in the

α p

- and

r p

-processes. An experiment to determine the cross section of this reaction was performed with the ANASEN active-target detector system, determining the cross section at energies between 2.5 and 4 MeV in the center-of-mass frame. The measured cross sections for reactions populating the ground state in

{}^{21}{Na}

are consistent with results obtained from the time-inverse reaction, but significantly lower than the previously published experimental data of direct measurements. The total cross sections are also compared with those derived from indirect methods and statistical-model calculations. This experiment establishes a new experimental data set on the excitation function of the

{}^{18}{Ne} (α, p) {}^{21}{Na}

reaction, revealing the significance of the excited states' contributions to the total reaction cross section and allowing us to separate the contribution of the

(α, 2 p)

reaction. The impact of the measured cross section on thermal reaction rates is discussed.

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