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14Be 库仑破裂实验准备

14Be 库仑破裂实验准备. 哈尔滨工程大学 RIBLL 合作组会议 @ 兰州 2013.08 宋玉收. 内容提要. 背景 事件产生与探测器建模 靶厚与 PID 讨论 实验事件预估 总结. 库仑破裂研究丰中子核. M. Labiche et. al, prl86.600.2001. 库仑破裂应用. R rms (exp.) →. S 2n (exp.) and. 14Be 库仑破裂研究现状 实验数据有限，存在矛盾 数据与 11Li 、 6He 不同. S 2n =0.9MeV. S 2n =1.34MeV. 库仑破裂优势

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14Be 库仑破裂实验准备

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  1. 14Be 库仑破裂实验准备 哈尔滨工程大学 RIBLL合作组会议@兰州 2013.08 宋玉收

  2. 内容提要 • 背景 • 事件产生与探测器建模 • 靶厚与PID讨论 • 实验事件预估 • 总结

  3. 库仑破裂研究丰中子核 M. Labiche et. al, prl86.600.2001 • 库仑破裂应用

  4. Rrms (exp.) → S2n (exp.) and • 14Be库仑破裂研究现状 • 实验数据有限，存在矛盾 • 数据与11Li、6He不同 S2n=0.9MeV S2n=1.34MeV

  5. 库仑破裂优势 • 针对滴线核束流弱，截面大； • 外围碰撞，产物前向运动，可以前向角布置探测器； 实验装置示意图

  6. Nuclear reaction in G4 • G4 nuclear reaction models • Binary Cascade • Abrasion & Ablation • QMD • EMD • Not feasible for our problem

  7. Kinematics Pb Inelastic scattering Dissociation 14Be 14Be* 12Be 14Be* 2n S2n 12Be+n+n 14Be

  8. The inelastic scattering of 14Be on Pb target

  9. The breakup of excited 14Be

  10. 12Be kinematic information 2n kinematic information

  11. 14Be before EMD • Reaction position • Momentum direction • Kinetic energy P z

  12. Position distribution M. Labiche et. al, prl86.600.2001 570mg/cm2 ~500 m

  13. r Z

  14. Spectrum Setting

  15. Target thickness M. Labiche et. al, prl86.600.2001： 0.503 mm

  16. Influence on PID 12Be Time of Flight 14Be

  17. Pb Target 0.5mm

  18. According to EMD cross section: (1)The purity of 12Be with the PID cut is 80%=54898/(54898+13660) (2)12Be loss rate because of E-E Cut is ignorable

  19. Pb Target 1mm Particle Identification becomes more difficult

  20. Pb Target 1.5mm

  21. Pb Target 1.8mm

  22. S2n 14Be* 12Be+n+n 14Be

  23. PRELIMINARY Red: spectrum set Black: spectrum reconstructed Pb Target 0.5mm Red: spectrum set Black: spectrum reconstructed Pb Target 1mm

  24. 26.0/hour*100hour=2600 20Ne（80AMeV, 100enA） 200enA 的18O 作为入射初级束，3500um 的9Be 作为初级靶，降能器为2000um 的Al，分离提纯后的14Be，能量为35AMeV，能量展宽约8MeV（~1.6%），流强约为20 pps.

  25. Summary • M. Labiche et. Al (prl86.600.2001) chose the target with a thickness of 570mg/cm2 ~500 m; • According to our simulation 1mm is still a feasible thickness; • Thicker target will crack the reconstructed spectrum; • To be done: • Real three-body kinematic calculation; • Create GEANT4 Physics process to handle EMD reaction of 14Be on Pb target; • Considering optical process of neutron wall and CsI; • Considering neutron wall in more detail;

  26. 谢谢！

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