Progress of Low-energy Nuclear Astrophysics Studies Based on the 320 kV Platform at Lanzhou

HE Jianjun; XU Shiwei; MA Shaobo; HU Jun; ZHANG Liyong; HOU Suqing; YU Xiangqing; JIA Baolu

doi:10.11804/NuclPhysRev.34.03.403

For the hydrostatic stable burning in stars, the Gamow window is well below the Coulomb barriers for the charged-particle-induced nuclear reaction involved. Such nuclear reaction occurs through the quantum-mechanics tunneling effect, and its cross section drops rapidly approaching the Gamow window. An accelerator which can provide intense beam current is thus required to directly measure the reactions at low energies. An experimental setup for low-energy nuclear astrophysics studies has been recently established at a 320 kV high-voltage platform of the Institute of Modern Physics (IMP), Lanzhou, China. The driver machine of this platform is a very strong ECR ion source employing all-permanent magnets, which can typically supply up to about 100 eμA proton, alpha and many other heavy ions, and ultimately about 30 eμA currents can be achieved at the experimental terminal. The experimental setup includes a target chamber, and the charged-particle and γ-ray HPGe detectors. This work describes the setup established, characteristics of detectors, methodologies, and test results of several reactions with known cross sections. Furthermore, some important results published are shown briefly. We believe that the experimental technologies developed and experiences accumulated at this above-ground platform will be extremely helpful for the Jinping Underground Nuclear Astrophysics laboratory (JUNA) project in China.

Progress of Low-energy Nuclear Astrophysics Studies Based on the 320 kV Platform at Lanzhou

1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;

2. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;

3. University of Chinese Academy of Sciences, Beijing 100049, China

Funds: National Natural Science Foundation of China(11675229, 11490562); National Key Research and Development Plan(2016YFA0400503)

Received Date: 2016-10-01

Rev Recd Date: 2017-05-05

Publish Date: 2017-07-18

Key words:

Abstract: For the hydrostatic stable burning in stars, the Gamow window is well below the Coulomb barriers for the charged-particle-induced nuclear reaction involved. Such nuclear reaction occurs through the quantum-mechanics tunneling effect, and its cross section drops rapidly approaching the Gamow window. An accelerator which can provide intense beam current is thus required to directly measure the reactions at low energies. An experimental setup for low-energy nuclear astrophysics studies has been recently established at a 320 kV high-voltage platform of the Institute of Modern Physics (IMP), Lanzhou, China. The driver machine of this platform is a very strong ECR ion source employing all-permanent magnets, which can typically supply up to about 100 eμA proton, alpha and many other heavy ions, and ultimately about 30 eμA currents can be achieved at the experimental terminal. The experimental setup includes a target chamber, and the charged-particle and γ-ray HPGe detectors. This work describes the setup established, characteristics of detectors, methodologies, and test results of several reactions with known cross sections. Furthermore, some important results published are shown briefly. We believe that the experimental technologies developed and experiences accumulated at this above-ground platform will be extremely helpful for the Jinping Underground Nuclear Astrophysics laboratory (JUNA) project in China.

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Progress of Low-energy Nuclear Astrophysics Studies Based on the 320 kV Platform at Lanzhou

doi: 10.11804/NuclPhysRev.34.03.403

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