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Advanced Nuclear Experiments with GRETINA and ATLAS

Discover the unique experiments beyond Gammasphere with GRETINA and ATLAS for heavy element spectroscopy and more. Understand the advantages, mass selection, and efficiency they offer in nuclear studies. Unveil the Gretina advantage for singles studies and beam requirements.

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Advanced Nuclear Experiments with GRETINA and ATLAS

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  1. GRETINA ATLAS GAMMASPHERE GRETINA at ATLAS C.J. (Kim) Lister ATLAS Users Workshop 8-9th October 2009

  2. GRETINA at ATLAS C.J. (Kim) Lister Richmond Workshop on optimizing GRETINA Science 14-15th October 2007

  3. “Home Run Experiments” What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere? Heavy Element Spectroscopy ~ 100Sn “In-Beam” Coulomb Excitation of CARIBU Beams Inelastic Transfer with CARIBU (& stable) beams

  4. Our Nuclear Domain From: Yu. Ogenessian, DUBNA

  5. “Home Run Experiments” What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere? Heavy Element Spectroscopy ~ 100Sn “In-Beam” Coulomb Excitation of CARIBU Beams Inelastic Transfer with CARIBU (& stable) beams

  6. 100Sn Region “In-Beam” MUST have Mass Selection MUST have super-selective trigger. Advantages: Count rate, Compact geometry favors FMA trigger, Efficiency for high energy gamma rays, Excellent Doppler Correction. • Simulated single-g efficiency  10% at 1.0 MeV 5% at 4.0 MeV

  7. “Home Run Experiments” What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere? Heavy Element Spectroscopy ~ 100Sn “In-Beam” Coulomb Excitation of CARIBU Beams Inelastic Transfer with CARIBU (& stable) beams

  8. Coulomb Excitation of CARIBU Neutron Rich beams Two very exciting paths: CHICO Conventional Multi-Step Coulomb Excitation OR Unconventional “goundstate excitations only” J E

  9. How much beam do we need with Gammasphere? 14h at 6.109 pps! 1/25 107 pps for 2 weeks 1/250 106 pps for 2 weeks To identify excited 2+ state (beyond the 2+1) in vibrational nucleus (B(E2)~1Wu) with Gammasphere for 2 weeks beam time we need 105pps. For complete spectroscopy 106-107 pps will be needed! 1/2500 105 pps for 2 weeks

  10. The Gretina Advantage This kind of experiment is a “singles” study. Rates will be low with CARIBU beams, so rate is not an issue.(Though probably needing an active beam detector) BUT Recoil velocity is well defined in direction, but large (~7%) Gammasphere does not Doppler correct well, as gamma angle is not well defined, so lines are many 10’s keV broad …. sharpening them back to ~5keV will be equivalent (in sensitivity) to 10 times more beam.

  11. “Home Run Experiments” What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere? Heavy Element Spectroscopy ~ 100Sn “In-Beam” Coulomb Excitation of CARIBU Beams Inelastic Transfer with CARIBU (& stable) beams

  12. Fission products Deep-inelastic products Fission products Deep-inelastic products Multinucleon transfer with thick and thin targets.

  13. Inelastic Transfer Is a dirty business….. Lots of exotic nuclei can be made by multi-neutron transfer....especially starting with CARIBU beam GRETINA counting at 50,000Hz is needed to improve on Gammasphere stable-beam transfer studies

  14. Gammasphere

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