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International collaboration CREMA - Charge Radius Experiments with Muonic Atoms General goals: Laser spectroscopy of muonic atoms Determination of the Lamb shift and assessment of the nuclear size and other nuclear properties. Coimbra,

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International collaboration CREMA - Charge Radius Experiments with Muonic Atoms

General goals:

  • Laser spectroscopy of muonic atoms
  • Determination of the Lamb shift and assessment of

the nuclear size and other nuclear properties.

Coimbra, May 15, 2014 1

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CREMA – Portuguese team

  • LIBPhys – Laboratory for Instrumentation,

Biomedical Engineering and Radiation Physics

  • LIBPhys-UC: 2 senior, 2 postdoc, 1 PhD student, 1

technician

  • LIBPhys-UNL: 1 senior, 1 postdoc, 1 PhD student
  • I3N, University of Aveiro
  • 1 senior researcher

Coimbra, May 15, 2014 2

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CREMA – Portuguese team

Name Role Degree Time % L.M.P . Fernandes Principal Investigator PhD 50 J.M.F. dos Santos Senior Investigator Aggregation 15 J.P. Santos Senior Investigator Aggregation 20 J.F.C.A. Veloso Senior Investigator Aggregation 15 C.M.B. Monteiro Postdoc Investigator PhD 20 F.D. Amaro Postdoc Investigator PhD 50 P . Amaro Postdoc Investigator PhD 40

  • J. Machado

PhD Student Master 40 A.L. Gouvêa PhD Student Master 100

Coimbra, May 15, 2014 3

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Team responsibilities

LIBPhys:

  • To use their expertize in radiation detectors to develop X-ray

detectors needed for the several experiments.

  • Contributing to other collaboration tasks, including slow

control, participation in scientific runs and data analysis.

I3N:

  • Participation in the scientific runs.

Coimbra, May 15, 2014 4

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PTDC/FIS/82006/2006 (81 720 €)

  • Characterization of avalanche photodiodes for application to the

muonic hydrogen and muonic helium Lamb shift experiments

PTDC/FIS/102110/2008 (150 000 €)

  • Muonic helium Lamb shift and precision tests of quantum

electrodynamics

PTDC/FIS-NUC/0843/2012 (194 880 €)

  • Participation in the international collaboration CREMA to measure

the muonic helium Lamb shift

Funding (FCT/COMPETE)

Coimbra, May 15, 2014 5

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Accomplished:

  • Muonic hydrogen Lamb shift experiment: the Portuguese team

was responsible for the detection system for 2 keV X-rays, made of 20 avalanche photodiodes.

  • Muonic helium Lamb shift experiment: the X-ray detection

system was optimized for 8 keV X-rays. New preamplifier system developed. Undergoing:

  • Muonic helium Lamb shift experiment: data analysis.
  • Preparation of the next experiment (muonic lithium). New

detectors needed for 18 keV X-rays.

Activities

Coimbra, May 15, 2014 6

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Main achievement: proton size

Coimbra, May 15, 2014 7

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  • 1. The size of the proton, R. Pohl et al., Nature 466 (2010) 213.
  • 2. The Lamb shift in muonic hydrogen, R. Pohl et al., Can. J.
  • Phys. 89 (2011) 37.
  • 3. Illuminating the proton radius conundrum: the μHe+ Lamb shift,
  • A. Antognini et al., Can. J. Phys. 89 (2011) 47.
  • 4. Is the proton radius a player in the redefinition of the

International System of Units?, F. Nez et al., Phil. Trans. R.

  • Soc. A 369 (2011) 4064.
  • 5. Proton Structure from the Measurement of 2S-2P Transition

Frequencies of Muonic Hydrogen, A. Antognini et al., Science 339 (2013) 417.

Publications

Coimbra, May 15, 2014 8

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  • 6. Laser spectroscopy of muonic hydrogen, R. Pohl et al., Ann.

Phys.-Berlin 525 (2013) 647.

  • 7. Lifetime and population of the 2S state in muonic hydrogen and

deuterium, M. Diepold et al., Phys. Rev. A 88 (2013) 042520.

  • 8. Reach-Through Avalanche Photodiodes in Soft X-ray detection,

A.L. Gouvea, A. Antognini, F. Kottmann, R. Pohl and L.M.P . Fernandes, IEEE Trans. Nucl. Sci. 61 (2014) 2419.

  • 9. Energy Resolution Contributions in Reach-Through Avalanche

Photodiodes, A.L. Gouvea and L.M.P. Fernandes, IEEE Trans.

  • Nucl. Sci. 61 (2014) 2667.
  • 10. Improved X-ray detection and particle identification with

avalanche photodiodes, M. Diepold et al., accepted for publication in Rev. Sci. Instrum. (2015).

Publications

Coimbra, May 15, 2014 9

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PhD Thesis:

  • Lamb shift in muonic helium: X-ray detection system, Andrêa

Leite Gouvêa, PhD in Physics Engineering (January 2015). Article in a Portuguese magazine:

  • “O enigma do raio do protão”, L.M.P. Fernandes, Gazeta da

Física 36 (2013) 2-5.

Other publications

Coimbra, May 15, 2014 10

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 RMD Avalanche Photodiodes for X-ray Detection in the Muonic

Hydrogen Lamb Shift Experiment, L.M.P. Fernandes, European Conference on X-ray Spectrometry, Figueira da Foz, Portugal, 20- 25 June 2010.

 Muonic hydrogen Lamb shift and proton size, 17th National

Conference of Physics, L.M.P. Fernandes, University of Trás-os- Montes e Alto Douro, Vila Real, Portugal, 1-3 September 2010.

 Energy Resolution Contributions in Reach-Through Avalanche

Photodiodes, L.M.P. Fernandes, 2012 IEEE Nuclear Science Symposium - Conference Record (2012) 415.

 Reach-through APDs for X-ray detection, A.L. Gouvea, 2012 IEEE

Nuclear Science Symposium - Conference Record (2012) 424.

Presentations

Coimbra, May 15, 2014 11

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  • Publication of the results of the muonic helium Lamb shift

experiment after the data analysis is complete.

  • Help to solve the proton radius puzzle.
  • R&D for the muonic lithium Lamb shift experiment: selection of

suitable detectors and respective amplifiers.

  • Setup of the experiment and scientific run.

Prospects for the near future

Coimbra, May 15, 2014 12