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

M. Anastasiou,I. Wiedenhöver,J. C. Blackmon,L. T. Baby,D. D. Caussyn,A. A. Hood,E. Koshchiy,J. C. Lighthall,K. T. Macon,J. J. Parker, T. Rauscher,Nabin Rijal

arXiv (Cornell University)（2021）

Cited 0|Views6

Abstract

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 to separate the contribution of the

(α, 2 p)

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

Translated text

Key words

anasen,

^{18}

\alphap

^{21}

na,reaction,

^{18}

\alphap

^{21}

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【要点】：本文通过实验测量了$^{18}$Ne($\alpha,p$)$^{21}$Na反应的截面，揭示了激发态对总反应截面的贡献，并为理解在Type-I X射线爆发中的角色提供了新数据。

【方法】：研究利用ANASEN主动目标检测系统进行了实验，在质心系能量2.5至4 MeV范围内确定了反应截面。

【实验】：实验使用了ANASEN数据集，测量结果与时间逆反应的结果一致，但低于之前直接测量的数据，同时与间接方法和统计模型计算的结果进行了比较。

Measurement of the 18Ne(α,p)21Na reaction with ANASEN at Ec.m.= 2.5-4 MeV

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