Byelikov A, Adachi T, Fujita H, Fujita K, Fujita Y, Hatanaka K, Heger A, Kalmykov Y, Kawase K, Langanke K, Martínez-Pinedo G, Nakanishi K, von Neumann-Cosel P, Neveling R, Richter A, Sakamoto N, Sakemi Y, Shevchenko A, Shimbara Y, Shimizu Y, Smit F D, Tameshige Y, Tamii A, Woosley S E, Yosoi M
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
Phys Rev Lett. 2007 Feb 23;98(8):082501. doi: 10.1103/PhysRevLett.98.082501.
The Gamow-Teller strength distributions below the particle threshold in 138La and 180Ta, deduced from high-resolution measurements of the (3He,t) reaction at 0 degrees, allow us to evaluate the role of charged-current reactions for the production of these extremely rare nuclides in neutrino-nucleosynthesis models. The analysis suggests that essentially all 138La in the Universe can be made that way. Neutrino nucleosynthesis also contributes significantly to the abundance of 180Ta but the magnitude depends on the unknown branching ratio for population of the long-lived isomer.
通过对0度下（³He，t）反应的高分辨率测量推导得出的¹³⁸La和¹⁸⁰Ta中粒子阈能以下的伽莫夫-特勒强度分布，使我们能够评估中微子核合成模型中带电粒子流反应在这些极其稀有的核素产生过程中的作用。分析表明，宇宙中基本上所有的¹³⁸La都可以通过这种方式产生。中微子核合成对¹⁸⁰Ta的丰度也有显著贡献，但其量级取决于长寿命异构体布居的未知分支比。
