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Title:

?????????????? ??p???????

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Title: REFER 0 Author: porco Last modified by: porco Created Date: 9/2/2005 6:51:53 AM Document presentation format: – PowerPoint PPT presentation

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Title: ?????????????? ??p???????


1
????????????????p???????
  • ??????????
  • ????

2
????
  • ??p????????(?135MeV)???????????
  • p0????????????????????????????
  • ??????????p0?????
  • ????????????????????p0????,???????????????????????
    ?

??p???(??? p0) ?? 0 ?? 135 MeV/c2 ??
8.710-17?
3
????
?
e-
?
150MeV??????
p0 ???
p0 ?2????
  • 150MeV??????????p0???
  • e- A ? e- A p0
  • ???????????????p0???????
  • p0 ???8.710-17???99?2????
  • p0 ???????????????????67.5MeV?2????

4
??
??(??)
??????????
1??? 33?? 9??? ??????????
?????
  • ????????VBL??????????????150MeV????????????p0?????
    ????
  • ???150MeV????????????
  • s(e-, N)0.070.04µb

  • ??????
  • ??
  • ?????
  • ???????????????????????????

5
???????
  • 33 9???4???
  • ??? 2?
  • ??????????
  • ??? 112cm ??
  • ??? 6?

??(??)
??
??(?)
????????????? ?12?????
6
????
?????
??
8mm??????
???2,3
??????
???1
???4
?????
800mm
  • ???????8mm???????
  • ?????????1,2,3??????????

?????1.3kHz????1.3105??????
7
?????
  • ???????
  • p0 ??????
  • p0 ????????????
  • p0 ??????????2????????
  • ????????????
  • ???????????
  • ???????
  • ???????????????

?
?
?
?
?6??
8
??????????????????
  • ????????????????????????
  • ????p0?????????????????

????
????
MeV
MeV
9
???????????2??????????? (??????150MeV)
?(??)?(??)
??
??
??
??
??
10
??????
??? 2, 3
??????
??? 1
??? 4
??????(???3???) ????????? ???????
???1
???2
???1
???2
???3
???4
???3
???4
11
?????? 2????????????
  • p0 ???????
  • 2?????2????????
  • ? 2?????????

?????????????????? ?????????????????
12
????????????????2??????????? (??????150MeV)
?(??)?(??)
??
??
??
??
??
13
p0 ?????
????? ????? p0(like)????
? ? ? 522 1
? ? ? 1171 2
? ? ? 1197 0
? ? ? 2177 3
? ? ? 1473 13
? ? ? 811 0
1693????? 3????
5658????? 16????
  • ????
  • ???p0???????????????

14
p0 ?????????
??????????? F (1.3290.139) 103 cm-2s-1
??????? N 9.441024 cm-2
???? eff 3.55 (??????????)
????? t 1.304 105 s
  • ????????? 0 ???
  • ????????????90?????2.44??

(???90)
15
??
  • 4?????????????????p0?????????????????????????
  • 150MeV??????????????????????????p0??????????0.043
    0.004µb(???90)????

16
???
17
p0 ?????
????? ????? p0(like)????
? ? ? 522 1
? ? ? 1171 2
? ? ? 1197 0
? ? ? 2177 3
? ? ? 1473 13
? ? ? 811 0
1171????? 2????
2008????? 0????
  • ????
  • ???p0????? 0.0340.025µb

18
(No Transcript)
19
  • GEANT4?????????????????????????????(4.0MeV???????)
    ?????????????????????????????????

20
PWO
??? PbWO4
PWO
  • ?????? Moliere??

??????? ????????? !!
20cm
21
??????????????
  • ???????
  • ???????(??????200MeV)

????
????
????
????
22
??????
  • ??????????????????????p???????,????????????????
  • ????????????p????????
  • 150MeV???????????
  • ???????????p??????
  • ????????????????????.
  • 150MeV??????????????????????

23
????????????
8/5
  • ??????
  • p0???2??????(??)
  • ? ??(150MeV)???????145MeV??????
  • ? p ?(gt145MeV) ? ?
  • ? ? ? p p0
  • ?p0 ? 2?
  • ??????????????????????????
  • ??????????
  • ????????145MeV?????????
  • 145MeV???????????????
  • p0???2?????????????
  • ??????????????????

24
???????????? ??????
  • ??????????
  • ??????0.1149.9MeV???????????7.110-20cm2
    ?????????(1.310-4cm)????
  • ?1149MeV??????????????4.910-20cm2
  • ???????????????????????????????
  • ?????145MeV?????????
  • ????????0.34?????????
  • ?? 0.1149.9MeV???????????
  • ????????????????????????
  • ????????????????????????????

????????????????????????????????
25
???????????? ??????
  • 145MeV???????????????
  • ????2cm????????(?150MeV)???????
  • ???????????????
  • ? absorption length(g/cm2)
  • t thickness (in mass/unit
    area)
  • ???????????

?? ?? g/cm3 thickness g/cm2 absorption length for 150MeV cm? ?? I / I0 ??? 1 - I / I0
C 2.27 4.54 65 0.93 0.07
Si 2.33 4.66 32 0.86 0.14
Fe 7.87 15.74 21 0.47 0.53
Sn 9.31 18.62 12 0.30 0.70
Pb 11.35 22.7 10 0.10 0.90
????? Absorption length ? Particle data book
????????????????
26
???????????? ??????
  • p0???2?????????????
  • ?????????????????????????2????????????????? x
    ??????????????? ???????
  • 2????????????? ????

27
???????????? ??????
????Particle Data Book ? Absorption length
?????? ?C, Si, Fe, Sn, Pb? ?5?????????
145MeV??????????????? p0???2?????????????
?????(??)
???
????REFER????????????????? ??????Sn or
Fe??????!
28
?????????????p0?????
?????????1.5103 cm-2 sec-1
??????
?? ?????????cm ????cm2 ??? ??????? p0??? ?/28h
C 2 21 0.068 0.14 6
???????????????????????????????????? ???????????p0
????????
?? ?????????cm ????cm2 ??? ??????? p0??? ?/28h
C 2 11 0.068 0.068 3
C 2 22 0.066 0.26 11
Sn 2 0.50.5 0.54 0.14 6
Sn 2 11 0.41 0.41 18
Sn 2 22 0.25 1.0 43
Pb 2 0.50.5 0.54 0.14 6
Pb 2 11 0.32 0.32 14
Pb 2 22 0.11 0.44 19
????????(28h)??p0???
?
xcm
29
?????????????p0?????
????????(28h)??p0??? (2arms detector)
????????(28h)??p0??? (4arms detector)
?
?
xcm
xcm
30
  • 4?????????PMT????????!????4???????????????????????
    ????????p0????????????????????????????????????????
    ???????????????????
  • ??????2cm?????????
  • TDC???????!
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