In: Canadian Journal of Physics, 2007, vol. 85, no. 5, p. 469-478
The Lamb-shift experiment in muonic hydrogen (μ⁻ p) aims to measure the energy difference between the 2SF=11/2-2PF=23/2 atomic levels to a precision of 30 ppm. This would allow the r.m.s. proton charge radius rp to be deduced to a precision of 10⁻³ and open a way to check bound-state quantum electrodynamics (QED) to...
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In: Journal of Instrumentation, 2007, vol. 2, no. 08, p. P08005
The present manuscript reviews our R+D studies on the application of large area avalanche photodiodes (LAAPDs) to the detection of X-rays and vacuum ultraviolet (VUV) light. The operational characteristics of LAAPDs manufactured by Advanced Photonix Inc. were investigated for X-ray detection at room temperature. The optimum energy resolution obtained in four LAAPDs investigated was found to be in...
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In: Physical Review A, 2007, vol. 75, p. 040501(R)
Metastable 2S muonic-hydrogen atoms undergo collisional 2S quenching, with rates which depend strongly on whether the µp kinetic energy is above or below the 2S -P energy threshold. Above threshold, collisional 2S -P excitation followed by fast radiative 2P -S deexcitation is allowed. The corresponding short-lived...
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In: Optics Communications, 2005, vol. 253 (4-6), p. 362-374
Laser spectroscopy of the 2S-Lamb shift in muonic hydrogen (μ−p) is being performed at the Paul Scherrer Institute, Switzerland, to determine the root-mean-square (rms) proton charge radius with 10−3 precision. A multistage laser system has been developed which provides 0.2 mJ pulse energy tunable at 6 μm wavelength. An excimer pumped dye laser is used to drive a...
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In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005, vol. 540, p. 169-179
An experiment measuring the 2S Lamb shift in muonic hydrogen (μ-p) was performed at the Paul Scherrer Institute, Switzerland. It required small and compact detectors for 1.9 keV X-rays (2P–1S transition) with an energy resolution around 25% at 2 keV, a time resolution better than 100 ns, a large solid angle coverage, and insensitivity to a 5 T magnetic field. We chose Large Area Avalanche...
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