Date/Time: Thu Nov 14 2024 at 14:00<br/><br/>Location: Auditorium/Remote<br/><br/>Speaker: Michael Bishof (Argonne National Lab)<br/><br/>Title: Laser trapping trace radioactive isotopes: from uncovering the origin of ancient groundwater to testing the fundamental symmetries of nature.<br/><br/>Abstract: Laser cooling and trapping of neutral atoms depends on many repeated resonant interactions. Individually, these interactions have a small effect on the motion of the atom but collectively, they provide unprecedented precision for detecting and manipulating individual isotopes. At Argonne?s Trace Radioisotope Analysis CentER (TRACER), we employ Atom Trap Trace Analysis (ATTA), a technique that uses laser light to isolate and detect rare isotopes, to measure the isotopic abundance (I.A.) of extremely rare, long-lived isotopes of krypton (e.g. 81Kr, t1/2 = 229,000 y, I.A. = 10-12). In this talk, I will describe how we use the ATTA to determine the residence time of ancient groundwater, recent results from environmental samples, and our current efforts to further improve the ATTA technique.
Several aspects of ATTA have also been adapted to efficiently isolate, trap, and manipulate rare radium isotopes with unique sensitivity to beyond Standard Model (BSM) physics. Atoms containing nuclei with strong octupole deformation, such as 225Ra, are particularly sensitive to charge-parity violating interactions in the nuclear medium via measurements of the atomic electric dipole moment (EDM). Still, the radioactive decay and rarity of this isotope present a daunting challenge for precision measurements. I will describe our previous 225Ra EDM measurement and current efforts to improve measurement precision by three orders of magnitude.
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https://uvic.zoom.us/j/84812920596?pwd=6V8o5ig6gH3qs2uWDdSLgqkWFu968H.1
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Meeting ID: 848 1292 0596
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