Quantum Three-Body Calculation of the Nonresonant Triple-α Reaction Rate at Low Temperatures
Quantum Three-Body Calculation of the Nonresonant Triple-α Reaction Rate at Low Temperatures
复制标题
低温非共振三α反应速率的量子三体计算
DOI：
10.1143/ptp.122.1055
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
M. Kamimura
中科院分区：
文献类型：
--
作者：
K. Ogata;Masataka Kan;M. Kamimura
通过直接求解三体薛定谔方程，重新计算了三α反应速率。用三体散射的连续离散耦合通道方法对共振过程和非共振过程进行了同样的处理。α-α非共振态的精确描述显著地抑制了前两个α-粒子和第三个α-粒子之间的库仑势垒。因此，在92.04 keV下的α-α非共振连续态，即8 Be的基态，在低温下的贡献明显大于以往的研究。我们表明，在nacar编译和许多其他研究中采用的Nomoto三体非共振捕获过程方法是精确量子三体模型计算的粗略近似。我们发现，在10.7 K时，三α反应速率比NACRE的速率提高了约20个数量级。学科索引：240,481
Triple-α reaction rate is re-evaluated by directly solving the three-body Schrodinger equation. The resonant and nonresonant processes are treated on the same footing using the continuum-discretized coupled-channels method for three-body scattering. An accurate de- scription of the α-α nonresonant states significantly quenches the Coulomb barrier between the first two α-particles and the third α-particle. Consequently, the α-α nonresonant contin- uum states below the resonance at 92.04 keV, i.e., the ground state of 8 Be, give a markedly larger contribution at low temperatures than that reported in previous studies. We show that Nomoto's method for three-body nonresonant capture processes, which is adopted in the NACRE compilation and many other studies, is a crude approximation of the accurate quantum three-body model calculation. We find an increase in triple-α reaction rate by about 20 orders of magnitude around 10 7 K compared with the rate of NACRE. Subject Index: 240, 481