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Single neutron transfer on 23Ne and its relevance for the pathway of nucleosynthesis in astrophysical X-ray bursts
Physics Letters B ( IF 4.3 ) Pub Date : 2022-08-02 , DOI: 10.1016/j.physletb.2022.137361
G. Lotay , J. Henderson , W.N. Catford , F.A. Ali , J. Berean , N. Bernier , S.S. Bhattacharjee , M. Bowry , R. Caballero-Folch , B. Davids , T.E. Drake , A.B. Garnsworthy , F. Ghazi Moradi , S.A. Gillespie , B. Greaves , G. Hackman , S. Hallam , D. Hymers , E. Kasanda , D. Levy , B.K. Luna , A. Mathews , Z. Meisel , M. Moukaddam , D. Muecher , B. Olaizola , N.A. Orr , H.P. Patel , M.M. Rajabali , Y. Saito , J. Smallcombe , M. Spencer , C.E. Svensson , K. Whitmore , M. Williams

We present new experimental measurements of resonance strengths in the astrophysical 23Al(p,γ)24Si reaction, constraining the pathway of nucleosynthesis beyond 22Mg in X-ray burster scenarios. Specifically, we have performed the first measurement of the (d,p) reaction using a radioactive beam of 23Ne to explore levels in 24Ne, the mirror analog of 24Si. Four strong single-particle states were observed and corresponding neutron spectroscopic factors were extracted with a precision of ∼20%. Using these spectroscopic factors, together with mirror state identifications, we have reduced uncertainties in the strength of the key = 0 resonance at Er = 157 keV, in the astrophysical 23Al(p,γ) reaction, by a factor of 4. Our results show that the 22Mg(p,γ)23Al(p,γ) pathway dominates over the competing 22Mg(α,p) reaction in all but the most energetic X-ray burster events (T>0.85 GK), significantly affecting energy production and the preservation of hydrogen fuel.



中文翻译:

23Ne 上的单中子转移及其与天体物理 X 射线爆发中核合成途径的相关性

我们提出了天体物理学23 Al(p,γ) 24 Si 反应,在 X 射线爆发情景中将核合成途径限制在22 Mg 之外。具体来说,我们已经对 (d,p) 反应使用23 Ne 的放射性束来探索24 Ne( 24 Si的镜像类似物)中的能级。观察到四种强单粒子状态,并以~20%的精度提取了相应的中子光谱因子。使用这些光谱因子以及镜像状态识别,我们减少了关键 = 0 共振强度的不确定性r= 157 keV,在天体物理学中23 Al(p,γ) 反应,增加了 4 倍。我们的结果表明,22 Mg(p,γ) 23铝(p,γ) 途径在竞争的22 Mg(α,p) 除了最有活力的 X 射线爆发事件之外的所有反应 (>0.85GK),显着影响能源生产和氢燃料的保存。

更新日期:2022-08-02
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