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Future work Kamioka Kyoto We feel WIMP wind oh the earth NEWAGE ～ Direction Sensitive Direct Dark...
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Future work Kamioka Kyoto We feel WIMP wind oh the earth NEWAGE ～ Direction Sensitive Direct Dark Matter Search ～ Kyoto University Hironobu Nishimura [email protected] 1.Dark Matter μ -TPC micro Time Projection Chamber μ-PIC 2D gas detector 400μm pitch gas gain 10 3 ～ 10 4 30×30cm 100MHz readout system 3Direction Sensitive Direct Dark Matter Search DM WIMP γ γ nuclei 2. Direct Dark Matter Search NASA WMAP TEAM ４ . 3D-Tracking Detector for recoil nuclei ６ Operation in Kamioka mine DM→Nuclei Elastic scattering Large mass Low background High energy resolution Conventional method: using energ y spectrum Expected spectrum Expected scatter angle of recoil nuclei Forward events are 10 times larger than backward event Scatterd angle of nuclei cosγ Very strong evidence Schematic struc ture of μ-TPC Ex. Track of recoil nuclei scattered by neutron Low BG detector Larger volume lower pressure 2010 ～： With 1m 3 detectors NEWAGE will reach the frontier of the direct dark search and SUSY region. Mar 17-19, 2008 The Advances in Cosmic Ray Science T.Tanimori H.Kubo K.Miuchi S.Kabuki A.Takada K.Hattori K.Ueno S.Kurosawa T.Ida S.Iwaki Simulation with neutron background in Kamioka m ine No characteristic The evidence of DM is a difference between blue and red spectrum. WIMPS NORTH EAST WEST A track of the d irection of WIM Ps wind 12 ： 00 0 ： 00 6 ： 00 18 ： 00 E Promising candidate of da rk matter as an elementary particle • WIMP (neutralino) • Axion DAMA : signal region other: Upper limit DAMA CDMSⅡ XENON10 Related motion of WIM Ps and the solar sy stem Map of Kamioka mi ne Blue ： Surface （ 2006 ） Red ： Underground （ 2007 ） ５ .Direction Sensitive DM Search on Surface Surface run in the laboratory of Kyoto university Nov 1-27, 2006 0.15kg ・ days N 35.03 E 135.783 Gas: CF 4 0.2atm Energy spectle less environmental background Kamioka mine 2700 w.e. depth Jan. 2007 Operation Start!! Efficie ncy Lab-B PLB 654 （ 2007 ） 58 PLB 578 （ 2004 ） 241 Energy spectrum Super Kamiokande Background decrease to 40% of surface run. TPC ５０ｃｍ Readout modul e The first result of the direction-sensitive with a gas detector in the world •3D tracks with the resolution of sum-mm •Energy resolution of 40% @5MeV •Particle discrimination by dE/dx → γ-ray rejection power < 10 -4 Abstract: NEWAGE is a project of direction sensitive direct dark matter search. We are developing and operating a direction sensitive detector based on μ-TPC. We report on the performance of our detector and its first result. Cosγdistribution WIMPs are seemed to move with random directions. 1m 3 detecor Expected efficiency PRL 99, 091301 (2007) Dark Matter search Direct search : To detect inte raction between DM and nuclei on the earth Indirect search : To detect γ, antiproton, e+ and so on produced b y DM pair creation in the galaxy. Observation For sky Tokyo Observation In undergroun Relay on the annual modulation Few % of the total events. Not enough. 10 0 10 1 10 2 M wimp [GeV/ c 2 ] To detect WIMPs wind on th e earth WIMPs wind: relative motio n between WIMPs and solar system Recoil nuclei scattered fo rward Color: The distribution of directions of recoil nuclei Purple line: Expected tracks of the direction of the WIMP wind Flat response of the direction distribution →Background dominant NaI,Cs I Si,Ge LXe,LA r
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Transcript of Future work Kamioka Kyoto We feel WIMP wind oh the earth NEWAGE ～ Direction Sensitive Direct Dark...
Future workKamioka
Kyoto
We feel WIMP wind oh the earth
NEWAGE～ Direction Sensitive Direct Dark Matter Search ～
Kyoto University Hironobu Nishimura [email protected]
1.Dark Matter
μ -TPC micro Time Projection Chamber
μ-PIC 2D gas detector 400μm pitch gas gain 103 ～ 104 30×30cm
100MHz readout system
3Direction Sensitive Direct Dark Matter Search
DM WIMP γ γ
nuclei
2. Direct Dark Matter Search
NASA WMAP TEAM
４ . 3D-Tracking Detector for recoil nuclei
６ Operation in Kamioka mine
DM→Nuclei Elastic scatteringLarge massLow backgroundHigh energy resolution
Conventional method: using energy spectrum
Expected spectrum
Expected scatter angle of recoil nuclei
Forward events are 10 times larger than backward event
Scatterd angle of nuclei cosγ
Very strong evidence
Schematic structure of μ-TPC
Ex. Track of recoil nuclei scattered by neutron
Low BG detectorLarger volumelower pressure2010 ～：With 1m3 detectors NEWAGE
will reach the frontier of the direct dark search and SUSY region.
Mar 17-19, 2008The Advances in Cosmic Ray Science
T.Tanimori H.Kubo K.Miuchi S.Kabuki A.Takada K.Hattori K.Ueno S.Kurosawa T.Ida S.Iwaki
Simulation with neutron background in Kamioka mine
No characteristic The evidence of DM is a difference between blue and red spectrum.
WIMPS
NORTH
EASTWEST
A track of the direction of WIMPs wind
12 ：00
0 ： 006 ： 00
18 ：00
E
Promising candidate of dark matteras an elementary particle
• WIMP (neutralino)• Axion
DAMA : signal region other: Upper limit
DAMA
CDMSⅡ
XENON10
Related motion of WIMPs and the solar system
Map of Kamioka mine
Blue ： Surface （ 2006 ）Red ：Underground （ 2007 ）
５ .Direction Sensitive DM Search
on Surface
Surface run in the laboratory of Kyoto university Nov 1-27, 2006 0.15kg ・ days N 35.03 E 135.783 Gas: CF4 0.2atm
Energy spectle
less environmental backgroundKamioka mine 2700 w.e. depthJan. 2007 Operation Start!!
Efficiency
Lab-B
PLB 654 （ 2007 ） 58
PLB 578 （ 2004 ） 241
Energy spectrum
Super Kamiokande
Background decrease to 40% of surface run.
TPC
５０ｃｍ
Readout module
The first result of the direction-sensitive with a gas detector in the world
•3D tracks with the resolution of sum-mm•Energy resolution of 40% @5MeV•Particle discrimination by dE/dx
→ γ-ray rejection power < 10-4
Abstract: NEWAGE is a project of direction sensitive direct dark matter search. We are developing and operating a direction sensitive detector based on μ-TPC. We report on the performance of our detector and its first result.
Cosγdistribution
WIMPs are seemed to move with random directions.
1m3 detecor
Expected efficiency
PRL 99, 091301 (2007)
Dark Matter search Direct search : To detect interaction between DM and nuclei on the earth
Indirect search : To detect γ, antiproton, e+ and so on produced by DM pair creation in the galaxy.
ObservationFor sky
Tokyo
Observation In underground
Relay on the annual modulationFew % of the total events.Not enough.
100 101 102
Mwimp [GeV/c2]
To detect WIMPs wind on the earthWIMPs wind: relative motion between WIMPs and solar systemRecoil nuclei scattered forward
Color: The distribution of directions of recoil nuclei
Purple line: Expected tracks of the direction of the WIMP wind
Flat response of the direction distribution →Background dominant
NaI,CsISi,GeLXe,LAr
