New approach to determining radiative capture reaction rates at astrophysical energies

New approach to determining radiative capture reaction rates at astrophysical energies
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确定天体物理能量辐射捕获反应速率的新方法

DOI:
10.1103/physrevc.100.025804
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发表时间:
2019
期刊:
影响因子:
3.1
通讯作者:
R. Milner
R. Milner
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
I. Friščić;T. Donnelly;R. Milner

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辐射俘获反应在恒星核合成中起着至关重要的作用,但已被证明具有挑战性的实验确定。特别是,$^{12}$C$(\alpha,\gamma)^{16}$O反应的测量速率的大不确定性(100%)是任何恒星演化模型中最大的不确定性来源。随着新型强流能量回收直线加速器(ERLs)和高密度气体靶的发展,使用详细天平测量接近阈值的$^{16}$O$(e,e^\prime \alpha)^{12}$C反应开辟了一种新的方法来确定$^{12}$C$(\alpha,\gamma)^{16}$O反应速率,其精度显著提高($<20%)。我们提出的形式主义与光和电衰变反应,并考虑设计一个最佳的实验,以提供更高的精度。一旦新的ERLs上线,应该进行实验来验证我们提出的新方法。这种新方法对天体物理中的辐射俘获反应具有广泛的适用性。
Radiative capture reactions play a crucial role in stellar nucleosynthesis but have proved challenging to determine experimentally. In particular, the large uncertainty ($\sim$100%) in the measured rate of the $^{12}$C$(\alpha,\gamma)^{16}$O reaction is the largest source of uncertainty in any stellar evolution model. With development of new high current energy-recovery linear accelerators (ERLs) and high density gas targets, measurement of the $^{16}$O$(e,e^\prime \alpha)^{12}$C reaction close to threshold using detailed balance opens up a new approach to determine the $^{12}$C$(\alpha,\gamma)^{16}$O reaction rate with significantly increased precision ($<$20%). We present the formalism to relate photo- and electro-disintegration reactions and consider the design of an optimal experiment to deliver increased precision. Once the new ERLs come online, an experiment to validate the new approach we propose should be carried out. This new approach has broad applicability to radiative capture reactions in astrophysics.
DOI: 10.1103/revmodphys.89.035007
发表时间: 2017-09-07
影响因子: 44.1
作者:
deboer, R. J.;Gorres, J.;Uberseder, E.
通讯作者: Uberseder, E.
DOI: 10.1103/physrevd.95.122002
发表时间: 2017
期刊: Physical Review D
影响因子: 5
作者:
Deaconu C
通讯作者: Deaconu C