Search for inelastic scattering of WIMP with CsI ( Tl )
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2th Korea-China joint worksh op 2007 Collaboration Meeting KIMS collaboration 2007. 11. 23 S. Ryu,
description
Search for inelastic scattering of WIMP with CsI ( Tl ). KIMS collaboration 2007. 11. 23 S. Ryu,. Introduction - Indirect Search. Rotation curve of Spiral Galaxies Cosmic microwave background COBE, BOOMERANG, WMAP Modern X-ray Search Gravitational Lensing. Collaboration Meeting. 60 o. - PowerPoint PPT Presentation
Transcript of Search for inelastic scattering of WIMP with CsI ( Tl )
2th Korea-China joint workshop 2007Collaboration Meeting
KIMS collaboration2007. 11. 23
S. Ryu,
2th Korea-China joint workshop 2007Collaboration Meeting
Rotation curve of Spiral Galaxies Cosmic microwave background
◦ COBE, BOOMERANG, WMAP Modern X-ray Search
◦ Gravitational Lensing
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ρχ= 0.3 GeV cm-3
from the rotation curve of Milky Way Galaxy
8 x 8 x 30 cm3, ~8 kg
30 km/s
220 km/s
60o
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1. Double signature = recoil + γ2. Threshold Energy (57.6 keV for 127I)3. Lower cross section, but no quenching effect
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Vg AgAg
χχχ
j jj
Elastic scattering of DM Elastic scattering of spin-coupled DM Inelastic scattering of spin-coupled DM
γ
A Z N EG Mult Eli JPli t_1/2 ELf JPl
127 53 74 57.61 M1+E2 57.608 7/2+
1.95ns 0 5/2+
127 53 74 116.2 744.71 9/2+
2.79ps 6.28.69 7/2+
127 53 74 145.252
E2 202.860
3/2+
0.387ns
57.608 7/2+
127 53 74 172.132
M1+E2 374.992
½+ 31ps 202.860
3/2+
127 53 74 202.860
M1+E2 202.860
3/2+
0.387ns
0.0 5/2+
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Low internal background Good Pulse Shape Discrimination (PSD) Quenching
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5
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(a) Beijing0501A(b) Beijing0501B(c) Shanghai040
6
Coincidence event rejection ~ 6cpd level (20keV - 100keV)
2th Korea-China joint workshop 2007Collaboration Meeting
241Am source used (59.54 keV, 26.34 keV)
ΔE = 5.07 at 59.54 keVΔE/E = 0.36/√E + 0.026
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ELEGANT V,
NaI(Tl) : 10 x 10 x 102.3 cm,
47kg17 crystals used
β from 210Pb, 46.5 keV γ of 210Bi
( )2876
55
44
33
2210
)(exp ppxp
xpxpxpxpxpp
−+
+++++
KIMS,
CsI(Tl) : 8 x 8 x 23 cm, 6.02 kg
1 crystal used
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KIMS0.79±0.74 cpd / kg ,
1.76 cpd / kg ( 90% C.L.)
ELEGANT V0.098 cpd / kg (90%
C.L.)
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2
2
1v
vv th
in −=σσ )( NMNgG AFin 1222 *μσ ≡
20
2)(2/3
20
1),( v
vv
E
E
ev
vvdv
dn+
−
⎟⎟⎠
⎞⎜⎜⎝
⎛=
π
Total Event Rate
EcvM
EMM
T
TWthr Δ−
Δ=
22
22max
Mass threshold :
11.9 GeV for 129Xe
18.2 GeV for 127I
€
R =ρ χMχ
NTσ in v f F2(q)
€
f =1
vv 1− (v thr
2 v 2)dn
dvv,vE( )
vth
vmax∫ dv
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Event for different WIMP mass
(a) 50GeV
(b) 100GeV
(c) 500GeV
∫= max
)min(
),()(v
v ERTinT
R RE
dvvvfv
EFM
MN
dE
dR 12
22μ
σρ
χ
χ
1. Edet = ER x f + E*,2. Energy Resolution
Quenching (f) : 0.2 ~ 0.05 (20 – 140 keV)
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a. KIMS experiment (2007): 1.76 cpd (90% C.L)
b. ELEGANT V experiment (1994): 9.8 x 10-2 cpd
c. DAMA 129Xe experiment (2000): 1.16 x 10-2 cpd
More data are ready to be analyzed :
SET4 (2122.9 kg day)+ SET6 (1728.6 kg day)+ SET8 (3096 kg day)+ SET9 (2322 kg day)= Total 9269.5 kg day
New installation ( 12 crystals)103.2 kg x 1 year ~ 37600 kg
day
Project Limit
DAMA Xe : 2530.2 kg
days
KIMS project: 9269 kg
days
KIMS Project : 37600 kg
days
Elegant V : 61390 kg
days
KIMS : 319.1 kg days
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CsI(Tl) Single Crystal (Shanghai0406, 6.02 kg) 319.1 kg day, 6 cpd level (20~100 keV) 0.79±0.74 cpd / kg, 1.76 cpd (90% C.L.) The limit can be improved by the analysis of the remaining
data.
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![Search for WIMP-129Xe inelastic scattering with particle ...€¦ · by the DAMA group in 1996 and 20 0 0 [10,11] . XMASS obtained a 90% Confidence Level (CL) upper limit on the](https://static.fdocuments.in/doc/165x107/5ead698620e31327d33a8af8/search-for-wimp-129xe-inelastic-scattering-with-particle-by-the-dama-group-in.jpg)
