Electron scattering - towards Hofstadter's experiments for exotic nuclei
Electron scattering - towards Hofstadter's experiments for exotic nuclei
Electron scattering - towards Hofstadter's experiments for exotic nuclei
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2electron <strong>scattering</strong><strong>for</strong>nuclear-structure studies
elastic <strong>scattering</strong> and charge <strong>for</strong>m factorspin-0 <strong>nuclei</strong>L =0virtualphotonJ 0 + L = J 0no transverse F(q) contributesdσdΩ =(dσ dΩ ) Mott|F c (q)| 2F c (q) =ρ ( r)e −iq·r dr
Thanks to Rocky Mountain PBS Volunteers <strong>for</strong> Work at Charity FairRocky Mountain PBS thanks volunteers Dee Dukeheart, Jill Maxwell and Katie Harman, whohave represented us at our first-ever Combined Federal Campaign (CFC) charity fairs! InOctober, Dee, Jill and Katie manned in<strong>for</strong>mation booths at Denver-area federal agency offices,in<strong>for</strong>ming local federal employees on the impact we have in the Colorado community and handingout Rocky Mountain PBS goodies. We're excited to see the results of these ladies' work in April,when Rocky Mountain PBS will receive the first gifts from federal employees through the CFC.Welcome Andy Starcevich—Newest Volunteer Board MemberAndy was appointed by President Sharon Lipsey to be the new IT Chairperson (In<strong>for</strong>mationTechnology) at the September board meeting. The motion was ratified by the board. He will bethe Volgistics Chairman and database coordinator <strong>for</strong> Rocky Mountain PBS volunteers.Andy began volunteering <strong>for</strong> Rocky Mountain PBS in 1976 in the Pick Up and Pay area <strong>for</strong>Auction. As the Auction continued, he and his wife, Linda, over time became chairmen of theScribes, Runners, and Phone Bank areas. The last years of Auction, Andy was asked to be theWarehouse Coordinator which he ran successfully. He and Linda have also assisted withmembership pledge drives.Thank you Andy <strong>for</strong> accepting this important position <strong>for</strong> Rocky Mountain PBS!170 MILLION AMERICANS - UpdateAndy & Linda StarcevichThank you <strong>for</strong> being on the front line in the fight to save funding <strong>for</strong> publicbroadcasting. Your work continues to make a tremendous difference!When we asked you to respond to a new threat in Congress two weeks ago, you sent18,000 e-mails to Congress within just 4 days. You demanded that Congress opposethe dire proposals contained in the draft House Labor, Health and Human ServicesAppropriations bill released by Subcommittee Chairman Denny Rehberg. This draftbudget would: eliminate the two year advance funding <strong>for</strong> local public broadcastingstations – making it much easier to eliminate all public broadcasting funding in futurebudgets.Eliminate the two year advance funding <strong>for</strong> local public broadcasting stations –making it much easier to eliminate all public broadcasting funding in futurebudgets.
Cross Section <strong>for</strong> Elastic Scattering dσ/dΩ (cm 2 ) Momentum transfer q (MeV/c)
electron <strong>scattering</strong> <strong>for</strong> <strong>exotic</strong> <strong>nuclei</strong>σ(electron <strong>scattering</strong>) is not so large1st generation : elastic <strong>scattering</strong> => ρc(r)challenges : higher luminosity withsmall number of <strong>exotic</strong> <strong>nuclei</strong>1. further from the stability line2. accessible to smaller cross section (beyond elastic)GSI todayFuture facilitySIS 100/300UNILACFRSSIS 18ESRHESRSuper FRSeRI collider @ FAIRRESRCRNESRSCRIT @ RIBF
eyond elastic (charge) <strong>scattering</strong>charge elastic : protonL > 10 27 /cm 2 /sinelastic : transition densitymag. elastic : neutronL > 10 28 /cm 2 /sM15/2 +M3M5L > 10 30 /cm 2 /squasi-elastic : momentum density, S-factor(e,e’p)L > 10 29 /cm 2 /sS-factor|e-scatt ~ 0.6
4SCRIT R&D
Feasibility studies of the SCRIT scheme at KSR (Kyoto)1. externally injected ions are really trapped ?2. achievable luminosity and required ions numbers3. dynamical behavior of the trapped ions SCRIT prototype
Nions~10 6 ttrapping~50 msPRL 100 (2008) 164801PRL 102 (2009) 10250110 3 0 30 60 90L*dσ/dΩ((cm -2 s -1 )*(cm 2 sr -1 ))10 210 110 010 -110 -210 -3 133 CsScattering Angle (deg.)
≥# of ions required <strong>for</strong> L=10 27 /cm 2 /s : ~10 6 /s or lessR&D starts soon (middle of December)ef<strong>for</strong>ts to further reduce required # of ionsslow RI beams <strong>for</strong> SCRITISOL electronspectrometer 1. ISOL (~1kW)γ (or e) + UCx10 11 fission/s ( 132 Sn 10 9 /s)2. SLOWRI / BigRIPS (in future)150MeV microtron
conclusions● first electron <strong>scattering</strong> experimentusing the SCRIT scheme developed <strong>for</strong> rare-produced short-lived <strong>nuclei</strong>10 26 /cm 2 /s with 10 6 ions and Ie=80 mA (50 ms trap)● electron <strong>scattering</strong> facility completed150 - 700 MeV300-500 mAa few hours beam lifetime120 MeV80 mA100 s beam lifetimeKSR● construction of ISOL and electron spectrometer will starts soon● the first e+RI collision will take place at RIBF in 2013
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