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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1384
DTSTART:20090409T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260420T095533Z
LAST-MODIFIED:20090405T151224Z
LOCATION:4274 Chamberlin
SUMMARY:Simple Atom\, Extreme Nucleus: Laser Trapping and Probing of H
 elium-8\, NPAC (Nuclear/Particle/Astro/Cosmo) Forum\, Zheng-Tian Lu\, 
 Argonne National Laboratory an University of Chicagod
DESCRIPTION:Helium-8 (8He) is the most neutron-rich matter to have bee
 n synthesized on the Earth: it consists of two protons and six neutron
 s\, and remains stable for an average of 0.2 seconds. It is often view
 ed as a 4He core with four additional neutrons orbiting at a relativel
 y large distance\, forming a halo. Because of its intriguing propertie
 s\, 8He has the potential to reveal new aspects of the fundamental for
 ces among the constituent nucleons. We have recently succeeded in lase
 r trapping and cooling this exotic helium isotope\, and have performed
  precision laser spectroscopy on individual trapped atoms. Based on th
 e atomic frequency differences measured along the isotope chain 3He - 
 4He - 6He - 8He\, the nuclear charge radius of 8He has now been determ
 ined for the first time. Comparing this result with the values predict
 ed by a number of nuclear structure calculations\, we test theoretical
  understanding of the nuclear forces in the extremely neutron-rich env
 ironment. Moreover\, this method of capturing and probing atoms of rar
 e isotopes is also applied to experiments that test fundamental symmet
 ries and to applications of ultrasensitive trace analysis.
URL:https://www.physics.wisc.edu/events/?id=1384
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