Future facilities at PSI, the High-Intensity Muon Beams (HIMB) project

Lowest bound S-state energy of Coulombic three-body systems ($N^{Z+}\mu^-e^-$) consisting of a positively charged nucleus of charge number $Z$ ($N^{Z+}$), a negatively charged muon ($\mu^-$) and an electron ($e^-$), is investigated in the framework of few-body (i.e., two- and three-body) cluster model approach. For the three-body cluster model, we adopted the hyperspherical harmonics expansion (HHE) method. An approximated two-body model calculation is also performed for all the three-body systems considered here. A Yukawa-type screened Coulomb potential with an arbitrary screening parameter ($\lambda$) is chosen for the two-body subsystems of the three-body system. In the resulting Schr"{o}dinger equation (SE), the three-body relative wave function is expanded in the complete set of hyperspherical harmonics (HH). The use of the orthonormality of HH in the SE leads to a set of coupled differential equations (CDEs) which are solved numerically for a manageable basis size to get the energy (E). The pattern of convergence in energy relative to increasing basis size is also investigated. Results are compared with some of those found in the literature.

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Towards a high-intensity muon source

Cai,

He,

Liu

et al. 2024

Phys. Rev. Accel. Beams

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A high-intensity muon source driven by a continuous-wave superconducting linac holds the potential to significantly advance the intensity frontier of muon sources. Alongside advancements in accelerator technologies, breakthroughs in muon production target and collection schemes are essential. After a brief introduction to the development of the accelerator-driven system superconducting linac, a novel muon production target is proposed, utilizing a free-surface liquid lithium jet capable of handling the heat power generated by a proton beam with an energy of 600 MeV and a current of 5 mA. It is predicted by our simulation studies that the lithium target is more efficient in surface muon production compared to the rotating graphite target. The parameter space of the front end consisting of a lithium target and a large-aperture capture solenoid is explored, from the perspective of production efficiency, capture efficiency, and characteristics of the surface muon beam. Published by the American Physical Society 2024

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Future facilities at PSI, the High-Intensity Muon Beams (HIMB) project

Cited by 4 publications

References 13 publications

Bayesian tuning of the Compact Muon Beam Line for the Mu3e experiment

Bayesian tuning of the Compact Muon Beam Line for the Mu3e experiment

Few-body model approach to the lowest bound S-state of non-symmetric exotic atoms and ions

Towards a high-intensity muon source

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