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The Inverse Kinematics Resonance Elastic Scattering Reaction of 10,11,12 Be+p

The Inverse Kinematics Resonance Elastic Scattering Reaction of 10,11,12 Be+p. Liu Yingdu(刘应都) PHD candidate Advisor：Wang Hongwei, Ma Yugang 2013.01.10 Shanghai Institute of Applied Physics(SINAP), CAS. Outline. Motivation; The Experiment Introduction;

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The Inverse Kinematics Resonance Elastic Scattering Reaction of 10,11,12 Be+p

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  1. The Inverse Kinematics Resonance Elastic Scattering Reaction of 10,11,12Be+p Liu Yingdu(刘应都) PHD candidate Advisor：Wang Hongwei, Ma Yugang 2013.01.10 Shanghai Institute of Applied Physics(SINAP), CAS

  2. Outline Motivation; The Experiment Introduction; Data Analysis and the Preliminary Result;

  3. Motivation The study of exotic light nuclei far from the stability is a major issue in recent nuclear physics experiments, because it can provide us more important information about the nuclear structure and inter-action, increasing our understanding on the behavior of nuclear matter at the extreme neutron to proton ratios. The interesting nuclei 10Be,11Be and 12Be resonance elastic scattering reaction

  4. The energy structure and width of 11B determination still exists debate; H.T.Fortune, Phys. Rev. C 74,034328 (2006); F.C.Barker, Phys. Rev. C 76,027602 (2007); Taken from :http://www.tunl.duke.edu/nucldata

  5. Measurement of Excitation function 10Be+p→11B(11Be) Simulation by R-matrix depends on these data • No experimental result has been reported in 10Be+p resonance elastic scattering reaction • Energy level data come from TUNL and capture reaction

  6. Measurement of Excitation function 11Be+p→12B(12Be) According to R-Matrix calculation，for first resonance state，if its spin-parity is 2+（excited state energy is 14.82MeV），the orbit angular momentum number is L=2，the single particle energy level width is 5.7keV，the calculated resonant state is a very sharp peak, and second will be flat peak at L=0，J=0+. Until now , No resonance elastic scattering data have been reported. Only two energy levels exist above 14MeV, and their spin-parities are still not clear

  7. Measurement of Excitation function 12Be+p→13B(13Be) 13Be is an unbound neutron emitter, theoretical predict it has a very low S wave（Jπ=1/2+） or P wave（Jπ=1/2-）ground state. But untill now, its energy level ,spin-parity are not confirmed in experiment.

  8. Thick Target Inverse Kinematics Method (TTIK) is a powfull tool for studying unstable neutron-riched nulei (developed by K.P.Artemov et al. in 1990,Sov.J.Nucl.Phys.52,480(1990) ) Experimental Method Low-Z recoil Heavy Ion Beam Low-Z recoil The 10Be(p,10Be)p is an inverse kinematical resonant elastical reaction using the TTIK method!!!

  9. Parameters of RIBLL1 Experiment Introduction Wedge Al 3060um Homogeneous C1 -Slit  10 mm 10,11Be 7.2MeV/u TOF start C9H10 50um HIRFL 18O8+ 59.62MeV/u，200enA Target Be 4616um • 2012 RIBLL1 10Be+p main parameters ： • 主束能量：18o, 59.62MeV/u • 初级靶 ：9Be, 4616um； • 降能片 ：Al, 3060um ； • 次级束 : 10Be,~7.2MeV/u； • 次级靶 : CH2, 41.85mg/cm2 C2- Slit  15 mm

  10. Experiment Introduction Setup of Experiment 10Be+p

  11. Some pictures Beam

  12. Position Sensitive silicon detector→ position calibration PPAC calibration

  13. Data Analysis Include : 1）PID befor target 2）PID after target 3）Subtract of Carbon background 4）Energy loss correction in PE target 10Be Beam Tunning Figure1: ∆E-ToF scattering plot Figure2: PID of experiment and TOF cut，10Be purity ~92%

  14. Include : 1）PID befor target 2）PID after target 3）Subtract of Carbon bkg 4）Energy loss correction in PE target 12Be Beam Tunning • No enough time for 12Be in this beam time. • Can't be selected by simple TOF cut, thin silicon ΔE detector must be used. • At the same time, big Accelerator question, Beam Stop. Silicon detector Dead. • Give up • Test Result: 100Count/s for 12Be beam, purity about 60%. 15C 14C 14B 13B 12B 12Be 11Li 11B 11Be 9Li 10Be 8He 8Li 7Li 6Li 6He 4He

  15. Data Analysis of 10Be • Include : 1）PID befor target 2）PID after target 3）Subtract of Carbon bkg 4）Energy loss correction in PE target Compare with GEANT4 Simulation. Red Point: Geant4； Brown point: Experimental data . Compare with Lise++ calculation Red point: Lise++； Brown point: experimental data

  16. Data Analysis • Include : 1）PID befor target 2）PID after target 3）Subtract of Carbon bkg 4）Energy loss correction in PE target protons come from： (a) 10Be + H (b) 10Be + C and other material around (c) other particles + C and material around deduction method：10Be+C exp. ; deducted per energy bin. the relationship of energy bins and mass thickness Carbon Background spectrum

  17. Data Analysis-Underconstruction proton energy loss in PE target correction • Include : 1）PID befor target 2）PID after target 3）Subtract of Carbon bkg 4）Energy loss correction in PE target detector Ep proton elastic, ∆Ep (CH2)n Figure: ∆Ep-Ep relationship (not the final result )

  18. Data Analysis Ene Loss cal：Gean4 & Lise++、difference < 5%

  19. Data Analysis---Scattering angle 1. Beam direction were determined by the PPACs 2. Recoil protons direction was determined by the Position Sensitive Silicon Detectors '

  20. Data Analysis-Ecm Preliminary result More work need to do....

  21. Thank you! 请多指教!!

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