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Coincidence measurement of heavy ion and protons with SAMURAI

This presentation discusses the measurement of coincidence events between heavy ions and protons using the SAMURAI setup. The focus is on invariant mass spectroscopy and determining momentum in coincidence. The experiment aims to study nuclear astrophysics processes such as rp-process and p-process, with examples including 56Ni(p,g)57Cu and 100Sn(p,g)101Sb reactions. The development of detectors, including Si detectors and new CSAs, is discussed. The schedule and budget status are also mentioned, with plans for the first experiment in 2013.

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Coincidence measurement of heavy ion and protons with SAMURAI

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  1. Coincidence measurement of heavy ion and protons with SAMURAI Y. Togano, K. Yoneda RIKEN Nishina Center

  2. Invariant mass spectroscopy of proton-rich nuclei AZ (A+1)(Z+1)* (A+1)(Z+1) p AZ + p Incident beam A+1Z+1 target AZ and proton @ beam velocity Determine momentum in coincidence  Invariant Mass M  Excitation Energy

  3. HI-proton coincidence expsin early phase Nuclear Astrophysics rp-process, p-process 56Ni(p,g)57Cu, 64Ge(p,g)65As, 68Se(2p,g)70Kr, 100Sn(p,g)101Sb, … Presentation tomorrowby Trache, Iwasa, and Togano 2p decay 17Ne, 20Mg, 22Si,…

  4. For the first experiment Large Acceptance Mode high resolution mode PI, momentum of Heavy ion PI, momentum of proton(s) Larger geometrical acceptancewith weaker magnetic field (~half 3T) Beam go through the hole at the york  smaller geometrical acceptance

  5. Setup using SAMURAI • Heavy Ion • DC + plastic (+ IC) • Proton • 2 DC + plastic • For the invariant mass • Opening angle of H.I. – p • Si detector before the magnet • Several mrad order • Strip Si detector Pb target

  6. GLAST Si • Single sided strip Si detector • Size: 89.5 x 89.5 x 0.3 mm3 • Number of strips: 384  128 • Strip pitch: 0.228 mm  0.684 mm • Full depletion voltage: 90~95 V

  7. PCB design and bonding pattern for Si detector C1 C1 C1 C1 C1 C1 C1 C1 C1 C1 Outer dimensions = 146 mm × 146 mm Connectors made by KEL (USL0040L) for ultrafine coaxial cable 0.4 mm pitch Capacitors to suppress cross talk through rear side < 1 / 10^4 = 0.01% C1 1 3 R1 R1 5 6 stip1 Si 89.5 mm × 89.5mm Stip2 Stip3 : : : enlarged view stip383 stip384 Symmetric layout with upper side Will be ready in May

  8. RIKEN Dual Gain C.S.P. • New ASIC type C.S.A. • Capacitive division: 1input  2outputs • High gain side circuit with saturation suppressor • Prototype have been tested Next presentation RIKEN DGCSP Saturation suppressor Inside of vacuum HINP16C Air Chigh S.A. high gain -A Clow S.A. low gain -A

  9. Result: Dynamic range for dual channel CSAs pulser 560 pF SA-HG ADC-H-H CSA SA-LG ADC-H-L Dynamic range ~ 10^4 10 times wider than that is obtained for the single channel usage CSA 56 pF SA-LG ADC-L-L 104 103 102 ADC-H-H 101 ADC-H-L ADC-L-L 56 pc 5.8 fc 100 10-3 10-2 10-1 100 101 102 Definition of lower limit = 4s

  10. Other option Output • C.S.A. with sqrt compression • 1input  1output • Size of C.S.A. is large Ein [MeV] Inside of vacuum HINP16C Sqrt compression Air CSA -A S.A.

  11. Schedule & budget status • Assuming we have experiments from 2013 • Bonding of GLAST Si to PCB board: ~May 2011 • Dual Gain CSP: Mass production in 2011 or 2012 • With Kakenhi ? • New preamp prepared later ? • With Kakenhi ? • 2p setup sometime later ? • Electronics for DC must be modified

  12. Summary • The detectors for the coincidence measurement of heavy ion and protons with SAMURAI is under development. • Fabrication of PCBs for Si detectors and the bonding will be finished by May 2011. • Development of new CSAs • Dual Gain C.S.P.: achieve dynamic range of ~104 • CSA with sqrt compressor: proto type have been fabricated • First experiment  2013

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