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

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

3. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 3 “Home Run Experiments” What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere? Heavy Element Spectroscopy ~ 100 Sn “In-Beam” Coulomb Excitation of CARIBU Beams Inelastic Transfer with CARIBU (& stable) beams

4. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 4 Our Nuclear Domain From: Yu. Ogenessian, DUBNA

5. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 5 “Home Run Experiments” What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere? Heavy Element Spectroscopy ~ 100 Sn “In-Beam” Coulomb Excitation of CARIBU Beams Inelastic Transfer with CARIBU (& stable) beams

6. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 6 100 Sn 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-  efficiency  10% at 1.0 MeV 5% at 4.0 MeV

7. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 7 “Home Run Experiments” What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere? Heavy Element Spectroscopy ~ 100 Sn “In-Beam” Coulomb Excitation of CARIBU Beams Inelastic Transfer with CARIBU (& stable) beams

8. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 8 Coulomb Excitation of CARIBU Neutron Rich beams Two very exciting paths: CHICO Conventional Multi-Step Coulomb Excitation OR Unconventional “goundstate excitations only” E J

9. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 9

10. 10 How much beam do we need with Gammasphere? 14h at 6.10 9 pps! 1/25 1/250 1/2500 10 7 pps for 2 weeks 10 6 pps for 2 weeks 10 5 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 10 5 pps. For complete spectroscopy 10 6 -10 7 pps will be needed!

11. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 11 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.

12. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 12 “Home Run Experiments” What are the GRETINA-and-ATLAS unique experiments that CANNOT be done with Gammasphere? Heavy Element Spectroscopy ~ 100 Sn “In-Beam” Coulomb Excitation of CARIBU Beams Inelastic Transfer with CARIBU (& stable) beams

13. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 13 Multinucleon transfer with thick and thin targets. Deep-inelastic products Fission products Deep-inelastic products Fission products

14. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 14 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

15. GRETINA Science Opportunities, U. of Richmond VA, 14-15 th Oct 20007 15 Gammasphere