哈尔滨工程大学 RIBLL合作组会议@兰州 2013.08 宋玉收 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.

Presentation on theme: "哈尔滨工程大学 RIBLL合作组会议@兰州 2013.08 宋玉收 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."— Presentation transcript:

1 哈尔滨工程大学 RIBLL合作组会议@兰州 2013.08 宋玉收
14Be 库仑破裂实验准备 哈尔滨工程大学 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 库仑破裂应用 M. Labiche et. al, prl

4 14Be库仑破裂研究现状 S2n (exp.) and Rrms (exp.) → 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 2n S2n
12Be+n+n Inelastic scattering Dissociation S2n 14Be

8 The inelastic scattering of 14Be on Pb target

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10 The breakup of excited 14Be

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12 12Be kinematic information 2n kinematic information

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

15 Position distribution
M. Labiche et. al, prl mg/cm2 ~500 m

16 r Z

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19 Spectrum Setting

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21 Target thickness M. Labiche et. al, prl86.600.2001： 0.503 mm
beam profile energy smearing (8MeV, ~1.6%) Incident direction Target thickness (mm) Ion telescope resolution Neutron wall resolution & threshold N Y 0.5 1.0 1.5 1.8

22 Influence on PID 12Be Time of Flight 14Be

23 Pb Target 0.5mm

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25 incident TOF TOF&E-E 12Be 600,000 55911 54898 14Be 15,000,000 6441 1366 According to EMD cross section: (1)The purity of 12Be with the PID cut is %=54898/( ) (2)12Be loss rate because of E-E Cut is ignorable

26 Pb Target 1mm Particle Identification becomes more difficult

27 Pb Target 1.5mm

28 Pb Target 1.8mm

29 14Be 14Be* 12Be+n+n S2n

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

31 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. 26.0/hour*100hour=2600

32 Summary M. Labiche et. Al (prl ) 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;

33 谢谢！