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Double Beta Decay

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Title: Double Beta Decay


1
Double Beta Decay
  • ?????????

2
1.Double Beta Decay???
  • 1-1.??
  • 1-2.Majorana???
  • 1-3.Double Beta Decay???
  • 1-4.Double Beta Decay????????

3
1-1.??
  • Neutrino-less?
  • Double Beta Decay???
  • ?????!

4
1-2.Majorana???
  • Majorana?? Dirac??
  • ????? ?? ???
  • ???????? ?????
  • Condition Condition
  • ???? ????
  • ???????????

5
1-3.DBD???
  • mode(Standard Model)
  • diagram

6
1-3.DBD???
  • Condition
  • 1??ß???????????????

Energy
??
N(A,Z-2)
DBD
N(A,Z)
7
1-3.DBD???
  • DBD???
  • 1.beta decay beta decay
  • 2.electron capture beta decay
  • 3. electron capture electron capture

8
1-3.DBD???
mode( Neutrino-less ) diagram
9
1-3.DBD???
  • Standard Model?????????
  • 1.?????????
  • ???????????
  • 2.?????????
  • ??????????

10
1-3.DBD???
  • Neutrino-less Double Beta Decay???
  • 1.Majorana??
  • 2.??????helicity????
  • Massive???????

11
1-4.Double beta decay????????
  • Majorana?????
  • ????????
  • ?????????????

12
2.????????????????????????????
  • 2-1.CdTe(????????)
  • 2-2.??????
  • 2-3.Coplanar grid technique
  • 2-4.Flash Analog Digital Converter
  • 2-5.????????
  • 2-6.???????????
  • 2-7.??????

13
2.????????????????????????????
  • ?????CdTe???

??????????????????(Q?)
Q????????????????????????
14
2-1.CdTe(????????)
????
  • ??????????????
  • ????????????????
  • ???????
  • ????????????
  • ???????????

?????
15
2-2.??????
??
???
  • ???

???
???
????????????????????????????????????????
????????????????????????????
????????????????????????????
16
2-3.Coplanar grid technique
????Grid
????Grid
????Grid
CdTe
?????
  • ??????????2??Grid???????????Grid??????????

17
???????????????????
??1
??????
e
-
??2
??????
CdTe
???
???
  • ??????????Grid?????

??2
Voltage
??1
Voltage
??????
??????
??
??
18
???????????????????
??1
??????
e
-
??2
??????
CdTe
???
???
??????????Grid?????
??2
Voltage
??1
Voltage
Voltage
-

??????
??????
??
??
??
????????????????????
???????????????????????????
19
???????
  • Cs(????)????????CdTe????????????????????

CH1(high bias)
CH2(low bias)
CH2-CH1
20
2-4.Flash Analog Digital Converter
??FADC?????
Voltage
???????ADC??
??
??????????????
21
2-4. Analog Digital Converter
??FADC?????
Voltage
FADC??
??
?????????????????
22
2-5.????????
a52.2665 b1.32146 c14.6032 ???9.04911
a43.3118 b1.35264 c14.5578 ???9.29151
Cs(????)?????????
a35.8562 b1.62626 c14.2246 ??? 11.43272
  • ????????

CH1????130V????????(b/c)???? c????????????
23
2-6.???????????
???
(511keV)
????????
(511keV)
????????????????
  • CdTe(??????)????????
  • 2??NaI??????????????

24
CdTe?4??NaI???
4????2??NaI?????????????? CdTe????????????? ??????
????
25
2-7.??????
26
????
  • 33??????????
  • 10?????????????

27
????
  • 10????neutrino-less double beta decay?
  • 0????

28
3.????(CdTe)
  • Grid tech????
  • hole?????????????
  • Grid Tech?????????(?????)!

29
3.????(CdTe)
  • ??????????
  • ?????????????????
  • But CdTe???????????????
  • ????????
  • ??????????
  • ????????
  • Bias?????

30
3.????(DBD)
  • Neutrino-less Double Beta Decay?????
  • ???33????
  • ???????????????

31
  • Thank you for your listening!
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