Negative Muonium Ion Production With a C12A7 Electride Film

Otani, M.; Fukao, Y.; Futatsukawa, K.; Kawamura, N.; Matoba, S.; Mibe, T.; Miyake, Yasuhiro; Shimomura, K.; Yamazaki, T.; Hasegawa, K.; Kitamura, R.; Kondo, Yasuhiro; Morishita, T.; Iijima, T.; Inami, K.; Sue, Y.; Yotsuzuka, Mai; Iinuma, H.; Nakazawa, Yasuhiro; Ishida, K.; Saito, N.; Yasuda, Hiromasa

doi:10.1088/1742-6596/1350/1/012067

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…The demand for higher efficiency conversion has spurred the development of a radiofrequency linear accelerator Mu − generation method. Several experiments have been conducted in MLF at J-PARC [45,46]. In the experiments, the Mu − generation efficiency was measured using several targets: C12A7 electrode [47,48], Al foil, and SUS foil.…”

Section: Muon Coolingmentioning

confidence: 99%

Muon cooling and acceleration

Otani

2022

AAPPS Bull.

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Muons, which were discovered in the 1930s and first generated using an accelerator half a century after their discovery, are now widely used in several scientific fields such as particle physics and material science. Recent advancements in cooling techniques have reduced the phase-space volume of muon beams and driven the effort to realize muon acceleration, which has now been demonstrated for the first time. This paper reviews the current state of muon cooling and acceleration technologies.

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Section: Muon Coolingmentioning

confidence: 99%

Muon cooling and acceleration

Otani

2022

AAPPS Bull.

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First muon acceleration and muon linear accelerator for measuring the muon anomalous magnetic moment and electric dipole moment

Otani

2022

Progress of Theoretical and Experimental Physics

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Muon acceleration using a radio-frequency accelerator was recently demonstrated for the first time. Measurement of the muon anomalous magnetic moment and electric dipole moment at Japan Proton Accelerator Research Complex is the first experiment using accelerated muon beams, and construction will begin soon. The radio-frequency accelerator used in the experiment and the first muon acceleration are described in this paper.

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Charge Asymmetry of Muons Generated in a Muon Generator from Ultra-Dense Hydrogen D(0) and p(0)

Holmlid

2023

Particles

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Laser-induced nuclear reactions in ultra-dense hydrogen H(0) (review in Physica Scripta 2019) create mesons (kaons and pions). These mesons decay mainly to muons. The muons created are useful (patented source) for the muon-induced fusion process. The sign of the muons from the source depends on the initial baryons used. With D(0) (ultra-dense deuterium) the source produces mainly positive muons and with p(0) (ultra-dense protium) the source produces mainly negative muons. Negative muons are required for muon-induced fusion. This charge asymmetry was reported earlier, and has now been confirmed by experiments with a coil current transformer as the beam detector. The current coil detector would give no signal from the muons if charge symmetry existed. The charge asymmetry could indicate unknown processes, for example, caused by the different annihilation processes in D(0) and p(0). The conclusions of a new analysis of the results are presented here. Using D(0) in the muon source, the asymmetry is likely due to the capture of µ- in D atoms and D2 molecules. This leads to emission of excess µ+ from D(0). With p(0) in the muon source, the capture rate of µ- is lower than in D(0). The emitted number of µ+ will be decreased by the reaction between µ+ and the surrounding abundant electrons, forming neutral muonium particles. This effect decreases the amount of emitted µ+ for both p(0) and D(0), and it is proposed to be the main reason for a larger fraction of emitted µ- in the case of p(0). Thus, there is no dominant emission of negative muons which would violate charge conservation.

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Negative Muonium Ion Production With a C12A7 Electride Film

Cited by 3 publications

References 12 publications

Muon cooling and acceleration

Muon cooling and acceleration

First muon acceleration and muon linear accelerator for measuring the muon anomalous magnetic moment and electric dipole moment

Charge Asymmetry of Muons Generated in a Muon Generator from Ultra-Dense Hydrogen D(0) and p(0)

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