Nuclear Astrophysics at TRIUMF-ISAC: Stellar Burning Reaction Studies with DRAGON and TUDA

TRUMF-ISAC 的核天体物理学：使用 DRAGON 和 TUDA 研究恒星燃烧反应

• 批准号: SAPPJ-2016-00029
• 负责人: Ruiz, Chris
• 金额: $ 12.75万
• 依托单位: TRIUMF
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=663917
• 关键词: Nuclear; Astrophysics; TRIUMF; ISAC; Stellar

It is presently accepted that most of the chemical elements heavier than boron were produced in stars through nuclear reactions involving stable and radioactive nuclei and radioactive decays. Astrophysical models of the various stages of stellar evolution (e.g. quiescent burning, or explosive processes as seen in novae and supernovae) that contribute to this nucleosynthesis have recently become more advanced, enabling good predictions of astronomical observables. Examples of these are isotopic abundances frozen into dust grains that make up our solar system, gamma-ray fluxes from synthesized long-lived radionuclides, optical or x-ray luminosity etc. These quantities can be compared with astronomical observations, including those from orbiting gamma ray observatories or laboratory measurements on meteoric grains. This comparison is a powerful tool in the field of astrophysics and cosmology, giving us the most direct imaging technique of the nuclear processes inside stars and their explosions. In order to improve the models, and therefore advance our understanding of these powerful and mysterious stellar events, a precise knowledge of the nuclear reactions involved in energy generation and nucleosynthesis is required. ******The Nuclear Astrophysics program at TRIUMF-ISAC addresses these issues by making direct and indirect measurements of astrophysically important nuclear reactions with radioactive and stable accelerated ion beams. This is primarily done at the well-known DRAGON recoil separator facility, and at the TUDA charged particle array facility. In addition, the program participants engage in state-of-the art stellar model studies (using MESA-NuGrid) and ab-initio nuclear theory calculations.******Our proposal will request funding for the continued operation and development of the DRAGON program, including the hiring of 3 Post-Doctoral Research Associates, the existence of which has been the foundation of DRAGON's past success. We also request continuation of training of highly-qualified personnel such as Graduate Students, to make the cutting-edge measurements for the astrophysics cases mentioned above. We will also request one Post-Doctoral Research Associate for the TUDA program. Postdocs will also work using the DSL and SHARC facilities, performing complimentary research in a comprehensive nuclear astrophysics program. ********

目前可以接受的是，大多数化学元素比硼重的大多数是通过涉及稳定和放射性核和放射性衰变的核反应在恒星中产生的。恒星进化的各个阶段的天体物理模型（例如，在Novae和Supernovae中看到的静态燃烧或爆炸性过程）最近变得更加先进，为天文学可观察物的良好预测提供了良好的预测。这些例子是将我们的太阳能系统构成的粉尘颗粒，伽马射线的伽马射线通量，合成长寿命的放射性核素，光学或X射线亮度等。这些数量可以与天文学观察（包括从旋转γ射线观测器或实验室测量的天文学观察）进行比较。这种比较是天体物理学和宇宙学领域的强大工具，为我们提供了恒星内部核过程及其爆炸的最直接成像技术。为了改善模型，因此可以提高我们对这些强大而神秘的恒星事件的理解，需要对能量产生和核合成涉及的核反应的精确知识。 ****** triumf-ISAC的核天体物理学计划通过通过放射性和稳定的加速离子束对天体物理上重要的核反应进行直接和间接的测量来解决这些问题。这主要是在著名的Dragon Racoil分离器设施和TUDA带电的粒子阵列设施上完成的。此外，计划参与者从事最先进的恒星模型研究（使用Mesa-Nugrid）和Ab-Initio核理论计算。******我们的建议将为龙计划的持续运营和开发提供资金，包括雇用3个博士后研究协会，这是龙已经过去成功的基础。我们还要求继续对高度合格的人员（例如研究生）进行培训，以对上述天体物理学案例进行尖端测量。我们还将要求一位TUDA计划的博士后研究助理。 PostDocs还将使用DSL和Sharc设施进行工作，并在全面的核天体物理学计划中进行免费研究。 ********