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)
?(??)?(??)
??
??
??
??
??
13p0 ?????
????? ????? p0(like)????
? ? ? 522 1
? ? ? 1171 2
? ? ? 1197 0
? ? ? 2177 3
? ? ? 1473 13
? ? ? 811 0
1693????? 3????
5658????? 16????
- ????
- ???p0???????????????
14p0 ?????????
??????????? 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???
17p0 ?????
????? ????? 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???????)
?????????????????????????????????
20PWO
??? PbWO4
PWO
??????? ????????? !!
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???????!