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Possibilities for AMS experiments at ATLAS

Possibilities for AMS experiments at ATLAS. Philippe Collon , University of Notre Dame. Present status of AMS experiments at ATLAS. A number of AMS experiments have been performed at ATLAS Environmental science ( 39 Ar, 81 Kr, …)

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Possibilities 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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