# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (8): 109

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS •

### Spin polarization and production rate studies of surface muons in a novel solenoid capture system based on CSNS

Ran Xiao1,2, Yan-Fen Liu1,2,3, Xiao-Jie Ni1,2, Zi-Wen Pan1,2, Bang-Jiao Ye1,2

1. 1 State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
2 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
3 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
• Supported by:
Supported by the National Natural Science Foundation of China (No. 11527811).
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Ran Xiao, Yan-Fen Liu, Xiao-Jie Ni, Zi-Wen Pan, Bang-Jiao Ye. Spin polarization and production rate studies of surface muons in a novel solenoid capture system based on CSNS.Nuclear Science and Techniques, 2017, 28(8): 109
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Abstract:

A novel surface muon capture system with a large acceptance was proposed based on the China spallation neutron source (CSNS). This system was designed using a superconducting solenoid where a long graphite target was put inside it. Firstly, the spin polarization evolution was studied in a constant uniform magnetic field. As the magnetic field can interact with the spin of the surface muon, both the spin polarization and production rate of the surface muons collected by the new capture system were calculated by the G4beamline. Simulation results showed that the surface muons could still keep a high spin polarization (>90%) with different magnetic fields (0–10 T), and the larger magnetic field is, the more surface muons can be captured. Finally, the proton phase space, Courant–Snyder parameters, and intensities of surface muons of different beam fractions were given with magnetic fields of 0 and 5 T. The solenoid capture system can focus proton and surface muon beams and collect p_ and l_ particles. It can also provide an intense energetic positron source.