Precision Measurement of Orthopositronium Decay Rate Using SiO_2 Powder

Details Precision Measurement of Orthopositronium Decay Rate Using SiO_2 Powder Precision Measurement of Orthopositronium Decay Rate Using SiO_2 Powder

2003-08-10

arxiv.org/abs/hep-ex/0308030v1

Phys.Lett. B572 (2003) 117-126

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, 7 figures included. To be published in Physics Letters B

Scientific paper

The intrinsic decay rate of orthopositronium formed in ${\rm SiO_2}$ powder is measured using the direct $2\gamma$ correction method such that the time dependence of the pick-off annihilation rate is precisely determined using high energy-resolution germanium detectors. As a systematic test, two different types of ${\rm SiO_2}$ powder are used with consistent findings. The intrinsic decay rate of orthopositronium is found to be $7.0396\pm0.0012 (stat.)\pm0.0011 (sys.)\mu s^{-1}$, which is consistent with previous measurements using ${\rm SiO_2}$ powder with about twice the accuracy. Results agree well with a recent $O(\alpha^2)$ QED prediction, varying $3.8-5.6$ experimental standard deviations from other measurements.

Affiliated with

Also associated with

No associations

Rating

Precision Measurement of Orthopositronium Decay Rate Using SiO_2 Powder does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Precision Measurement of Orthopositronium Decay Rate Using SiO_2 Powder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Precision Measurement of Orthopositronium Decay Rate Using SiO_2 Powder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-518114