Hyperfine spectroscopy of muonic hydrogen and the PSI Lamb shift experiment

Adamczak, A.; Bakalov, D.; Stoychev, L.; Vacchi, A.

doi:10.1016/j.nimb.2012.04.001

Cited by 35 publications

(49 citation statements)

References 30 publications

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“…The laser excitation of the ortho S = 1 hyperfine sub-level of the ground state of the muonic hydrogen atom from the para S = 0 sub-level (where S = S p + S µ is the total spin of the muonic hydrogen atom µ − p) is an ambitious project of the FAMU collaboration [1]: the measurement of the resonance transition frequency will provide top-accuracy data on the Zemach radius of the proton [2]. This is a very weak M1 magnetic dipole transition with probability of only 2 × 10 −5 (E/J)(S /m 2 ) −1 (T/ • K) −1/2 for laser pulse energy E, laser beam cross section S and target temperature T [3], for which an optical multi-pass cavities needs to be used to enhance the probability of laser-stimulated transitions to a reasonable level.…”

Section: Introductionmentioning

confidence: 99%

Toward the measurement of the hyperfine structure of muonic hydrogen in the FAMU experiment: Multi-pass cavity optimization for experiments with pulsed sources.

Bakalov

Stoilov

2018

EPJ Web of Conferences

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We consider a simplified model of the optical multi-pass cavity that is being currently developed by the FAMU collaboration for the measurement of the hyperfine splitting in the ground state of muonic hydrogen and of the Zemach radius of the proton. The model is focused on the time distribution of the events of laser-stimulated hyperfine transitions in the muonuc atom and may be helpful in the preliminary design of the FAMU experimental set-up and, more generally, in the optimization of multi-pass optical cavities for experiments with pulsed lasers. *

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Section: Introductionmentioning

confidence: 99%

Toward the measurement of the hyperfine structure of muonic hydrogen in the FAMU experiment: Multi-pass cavity optimization for experiments with pulsed sources.

Bakalov

Stoilov

2018

EPJ Web of Conferences

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“…The beam comes from the left. Visible are the 1 mm pitch beam hodoscope (1), the Ce:LaBr 3 crystals with photomultiplier (PMT) readout (2), arranged in a crown of 8 elements and the cryogenic target (3). The HPGe detectors are not drawn in this view.…”

Section: The Famu Experimental Setupmentioning

confidence: 99%

“…The FAMU proposal [1,2] aims to a new high precision measurement of muonic Hydrogen spectroscopy. In this experiment, incident low momentum muons from pulsed muon source are stopped in a Hydrogen gas mixture at appropriate temperature and pressure to form muonic Hydrogen atoms µp.…”

Section: Introductionmentioning

confidence: 99%

The FAMU experiment at RIKEN-RAL to study the muon transfer rate from hydrogen to other gases

et al. 2018

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A: The aim of the FAMU (Fisica degli Atomi Muonici) experiment is to realize the first measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen ∆E h f s 1S , by using the RIKEN-RAL intense pulsed muon beam and a high-energy mid-infrared tunable laser. This requires a detailed study of the muon transfer mechanism at different temperatures and hence at different epithermal states of the muonic system. The experimental setup involves a cryogenic pressurized gas target and a detection system based on silicon photomultipliers-fiber beam hodoscopes and high purity Germanium detectors and Cerium doped Lanthanium Bromide crystals, for X-rays detection at energies around 100 keV.Simulation, construction and detector performances of the FAMU apparatus at RAL are reported in this paper.

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“…Therefore, a high pulse energy is of necessity for the HFS transition compared to the Lamb shift case. The transition probability P obeys an equation P = 2 × 10 −5 E/S/ √ T where E is the laser pulse energy, S is the cross-section of the laser beam, and T is the temperature [11]. The reflection mirrors multiply the transition probability by the number of laser light reflection N. The experimental design parameters are E = 20 mJ, S = 4 cm 2 , T = 20 K and N = 2000.…”

Section: Laser Systemmentioning

confidence: 99%

Precision laser spectroscopy of the ground state hyperfine splitting in muonic hydrogen

Kanda

2018

Proceedings of the 19th International Workshop on Neutrinos From Accelerators NUFACT2017 — PoS(NuFact2017)

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The proton is a fundamental constituent of the matter. However, it has a complicated internal structure which is difficult to be fully understood. The internal structure of the proton is described by the electronic and magnetic form factors. The charge radius of the proton is defined by these form factors and has been determined experimentally. In recent years, a significant discrepancy between independent measurements of the proton charge radius was reported. This conflict is known as "proton radius puzzle". Even though various interpretations have been proposed, no definitive solution to the problem has been found yet. In order to shed some light on the puzzle, we proposed a new experiment to determine the proton Zemach radius which is defined as a convolution of the charge distribution with the magnetic moment distribution. The proton Zemach radius can be derived from the hyperfine splitting (HFS) in the muonic hydrogen atom. We aim to perform a laser spectroscopy of the muonic hydrogen HFS with the relative uncertainty of 1 ppm and obtain the proton Zemach radius with 1% precision.

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Hyperfine spectroscopy of muonic hydrogen and the PSI Lamb shift experiment

Cited by 35 publications

References 30 publications

Toward the measurement of the hyperfine structure of muonic hydrogen in the FAMU experiment: Multi-pass cavity optimization for experiments with pulsed sources.

Toward the measurement of the hyperfine structure of muonic hydrogen in the FAMU experiment: Multi-pass cavity optimization for experiments with pulsed sources.

The FAMU experiment at RIKEN-RAL to study the muon transfer rate from hydrogen to other gases

Precision laser spectroscopy of the ground state hyperfine splitting in muonic hydrogen

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