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SUMMARY:Illuminating Antimatter: the ALPHA antihydrogen experiment at CERN
  - Prof. Jeffrey Hangst (Aarhus University)
DTSTART:20190205T150000Z
DTEND:20190205T160000Z
UID:TALK114790@talks.cam.ac.uk
CONTACT:William Fawcett
DESCRIPTION:Antimatter continues to intrigue scientists due to its apparen
 t absence in the universe.  In recent years\, antimatter has come under un
 precedented experimental scrutiny\, as we can now test the fundamental sym
 metries of Nature to high precision using this unique tool.  We have recen
 tly become able to study atoms of antihydrogen - the antimatter equivalent
  of hydrogen.  The question to be addressed is fundamental and profound: 
 “Do matter and antimatter obey the same laws of physics?”  The so-call
 ed Standard Model of fundamental particles and interactions requires that 
 hydrogen and antihydrogen have the same spectrum. I will discuss the lates
 t exciting developments in antihydrogen physics: observation of the first 
 laser-driven transition (1S-2S) in trapped antihydrogen [1\,2] observation
  of the antihydrogen hyperfine structure [3]\, and observation of the Lyma
 n-alpha transition [4]. Precise measurement of the frequency of the 1S-2S 
 transition could well be described as the ‘holy grail’ of physics with
  anti-atoms. To study antihydrogen\, it must first be produced\, then trap
 ped [5]\, and then held for long enough [6] to observe a transition - usin
 g very few anti-atoms.  I will discuss the techniques necessary to achieve
  the latest milestones\, and then consider the future of optical and micro
 wave spectroscopy\, as well as gravitational studies [7]\, with antihydrog
 en.\n\n1. Observation of the 1s-2s Transition in Trapped Antihydrogen\, M 
 Ahmadi et al.\, (ALPHA Collaboration) Nature 541\, 506–510 (2017).\n\n2 
 Characterization of the 1S-2S transition in antihydrogen\, M Ahmadi et al.
 \, (ALPHA Collaboration)\, Nature 557\, 71–75 (2018).\n\n3\, Observation
  of the hyperfine spectrum of antihydrogen\, M Ahmadi et al.\, (ALPHA Coll
 aboration) Nature 548\, 66–69 (2017).\n\n4. Observation of the 1S–2P L
 yman-α transition in antihydrogen\, M Ahmadi et al.\, (ALPHA Collaboratio
 n)\, Nature 561\, 211–215 (2018).\n\n5. Andresen\, G.B. et al.\, Trapped
  Antihydrogen\, Nature\, 468\, 673 (2010).\n\n6. Andresen\, G. B. et al. C
 onfinement of antihydrogen for 1\,000 seconds. Nature Physics 7\, 558 (201
 1).\n\n7. Amole\, C. et al.\, Description and first application of a new t
 echnique to measure the gravitational mass of antihydrogen\, Nature Commun
 ications DOI: 10.1038/ncomms2787 (2013).\n
LOCATION:Ryle Seminar Room (Rutherford 930) 
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