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Advancements and Opportunities for AMS Experiments at ATLAS

This presentation by Philippe Collon from the University of Notre Dame highlights the current status and potential advancements for Accelerator Mass Spectrometry (AMS) experiments at ATLAS. It covers key applications such as environmental science, stellar nucleosynthesis, and WIMP dark matter detection. The discussion includes the necessity for improvements in isobaric separation, overall system stability, and high transmission rates. Future upgrades of the ATLAS facility are anticipated to enhance sensitivity, allow for the detection of radionuclides, and provide exciting prospects for groundbreaking research.

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Advancements and Opportunities for AMS Experiments at ATLAS

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  1. Possibilities for AMS experiments at ATLAS Philippe Collon, University of Notre Dame

  2. Present status of AMS experiments at ATLAS • A number of AMS experiments have been performed at ATLAS • Environmental science (39Ar, 81Kr, …) • Stellar nucleosynthesis (59Ni, 62Ni(n,g)63Ni, 146Sm, 182Hf,…) • WIMP dark matter detector development (39Ar) • AMS relies on a number of factors • Good isobaric separation • Stability of the entire system • High overall transmission

  3. 146Nd 146Sm FN TANDEM INJECTOR GFM Spectrograph ECR-II ATLAS LINAC ECR-I PII BOOSTER LINAC 146Sm t1/2 measurement using AMS 146Sm-146Nd separation 146Sm22+/146Nd22+ 840 MeV 146Sm/147Sm ~ 10-12 Detection of live 146Sm in meteorites may also be an interesting capability

  4. Gas Filled Magnet (GFM) Spectrograph Position-Sensitive Parallel-Grid Avalanche Counter PGAC Ionization Chamber DE1-DE5 146Sm 146Nd Blocking Shield Target Chamber Gas-Filled Magnet† 10 Torr N2 80Kr Beam Faraday Cup 152Sm23+

  5. High sensitivity 59Ni AMS using full stripping 59Ni-59Co separation ECR: 59Ni16+ (~3%) 630 MeV 1mg/cm2 C stripper foil 10% fully stripped Natural production of 59Ni (t1/2= 76 kyr) occurs by interaction of cosmic-ray particles with matter. This production is signficant only in extraterrestrial matter and concentrations of the order of 59Ni/Ni = 10-11 – 10-12 have been measured in iron meteorites by AMS

  6. List of commonly classified p-nuclides Stellar production rates can be studied using the inverse (a, g) reactions followed by AMS counting of produced nuclei

  7. Short-lived cosmogenic radionuclides

  8. AMS possibilities with the upgraded facility • A number of the radionuclides can be detected using smaller accelerators however a large number of very exciting nuclides will “benefit” from an ATLAS upgrade • Higher beam currents • Reduce count times (less stability requirements) • Allow access to lower reaction cross sections • Improve sensitivity • Higher beam energies ( improved isobaric separation) • Improved separation for gas-filled magnet techniques • Higher full-stripping probabilities

  9. 182Hf as an supernova indicator 182Hf is a r-process radionuclides with a rapid s-process component in massive stars. During supervovae events it can be injected into the interstellar medium t1/2 = 9x109 years Its signal should be detectable in geological material: Needs separation from 182W

  10. Possible needs for upcoming AMS experiments at ATLAS • Possibility of “clean” ion sources with the development of plasma chamber liner (Quartz) and/or the development of a dedicated quartz lined ECR source • Development of a new detector that can accommodate higher count rates • Improved continuous beam monitoring (both for transmission and primary beam intensity) • Further development of calibrated beam attenuation (tested during recent 146Sm experiments) • …..

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