Ar中の（α,n）反応について

α,n
3 B02
2015.5.18*
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@
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α,n
α
*
*
*
*
*
α,n
*
α,n
α
*
*
Xe
*
Kr
Ar
Ne
He
U
α
4.2~7.7MeV
α,n
ﬂux
•  Ar* *Xe*
*
Ar
Xe* *Ar*
6
*
Xe
1
U
Th
1ppm
Ar Xe
ﬂux 0.1MeV
1g
[1]
*
[1]*EvaluaIon*of*(α,n)*induced*neutrons*as*a*background*for*dark*maUer*experiments*
******hUp://www.sciencedirect.com/science/arIcle/pii/S016890020900833X
PTFE*:*C*(Z=6),*F*(Z=9)*
copper*:*Cu*(Z=29)
XENON100*
arXiv:1306.2303
α,n
! PTFE*
! Copper*
*neutron*producIon *
*SF*
*SF*
*
*
GEANT4α,n
Ar
*ﬂux*
NR
*LAr*
*Fiducial*
30cm
*
LAr*
Fiducial
*
10000
*
NR
100cm
30cm
LAr
50cm
GEANT4*
• 
• 
U
1ppm
Ar 1g
(α,n)
Geant4
*
*
ndﬂux[1]
*
NR
*NR*
1317/10000* **
Fiducial
*NR*
*
!  live*Ime*:*1month*
!  238U
*:*8.36ppb*
α
*
*
NR*
*
~*150*
*
•  α,n
•  GEANT4*
•  NR*
*
*
*
*
• 
α,n
*
•  NR*
*
–  α
–  mulIple*scaUer*
–  U
– 
*ANKOK*
*SOURCESd4C*
*
*veto*
*
**
*

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