Nuclear Astrophysics at ISAC with DRAGON

大多数化学元素是通过一系列核反应和放射性衰变在恒星中产生的，特定同位素的丰度取决于形成和破坏速度之间的竞争。DRAGON设施测量辐射捕获反应的强度，这是发生爆炸性氢或氦燃烧的场所的关键步骤。我们最近测量了两个对Al-26的破坏和Ti-44的形成很重要的反应，这两种放射性核素的衰变已经在轨道伽玛射线望远镜中被探测到。我们将继续测量在核天体物理学中重要的俘获反应。感兴趣的恒星位置包括新星、x射线爆发和超新星，而恒星观测包括来自核衰变的伽马射线和陨石颗粒中的同位素丰度。TRIUMF/ISAC的强放射性光束和DRAGON的高灵敏度的结合是世界上任何其他设施无法比拟的。

Most chemical elements have been produced in stars through a chain of nuclear reactions and radioactive decays, the abundance of a given isotope depending upon competition between rates of formation and destruction. The DRAGON facility measures strengths of radiative capture reactions which are key steps in sites where explosive burning of hydrogen or helium takes place. We recently have measured two reactions which are important in destruction of Al-26 or formation of Ti-44, two radionuclides whose decay has been detected in orbiting gamma-ray telescopes. We will continue to measure capture reactions of importance in nuclear astrophysics. Stellar sites of interest include novae, x-ray bursts and supernovae, while stellar observables include gamma rays from nuclear decay and isotopic abundances in meteorite grains. The combination of intense radioactive beams at TRIUMF/ISAC and high sensitivity of DRAGON is unmatched by any other facility in the world.