MIMAC MIcro-tpc MAtrix of Chambers A Large TPC for Directional Dark - - PowerPoint PPT Presentation

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MIMAC MIcro-tpc MAtrix of Chambers A Large TPC for Directional Dark - - PowerPoint PPT Presentation

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MIMAC MIcro-tpc MAtrix of Chambers A Large TPC for Directional Dark Matter detection Daniel Santos Laboratoire de Physique Subatomique et de Cosmologie (LPSC-Grenoble) (Universit Grenoble-Alpes -CNRS/IN2P3) MIMAC (MIcro-tpc MAtrix of

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SLIDE 1

MIMAC

MIcro-tpc MAtrix of Chambers

A Large TPC for Directional Dark Matter detection

Daniel Santos

Laboratoire de Physique Subatomique et de Cosmologie (LPSC-Grenoble) (Université Grenoble-Alpes -CNRS/IN2P3)

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SLIDE 2

MIMAC (MIcro-tpc MAtrix of Chambers )

LPSC (Grenoble) : D. Santos, F.Naraghi C.Couturier (post-doc), N. Sauzet

  • Technical Coordination, Gas circulation and detectors : O. Guillaudin
  • Electronics :
  • G. Bosson, J. Bouvier, J.L. Bouly,

L.Gallin-Martel, F. Rarbi

  • Data Acquisition:
  • T. Descombes
  • Mechanical Structure :
  • Ch. Fourel, J. Giraud
  • COMIMAC (quenching) :

J-F. Muraz IRFU (Saclay): P. Colas, E. Ferrer-Ribas, I. Giomataris CCPM (Marseille): J. Busto, D. Fouchez, C. Tao Tsinghua University (Beijing-China): C. Tao, I. Moric, Y. Tao XAO (Xinjiang-China): Chung-Lin Shan Neutron facility (AMANDE) : IRSN (Cadarache): T. Vinchon, B. Tampon (Ph. D.)

  • D. Santos (LPSC Grenoble)
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SLIDE 3

Directional detection: principle

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 4

Directional detection : principle

The signature, the only one (!), able to correlate the events in a detector to the galactic halo !!

  • D. Santos (LPSC Grenoble)

<Vrot> ~ 220 km/s Cygnus

DM-France, Paris, Dec 1st 2016

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SLIDE 5
  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

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SLIDE 6

l b XG YG ZG Solar System Galactic Center VWIMP VSS Solar System’s orbit Dark matter Halo = gaz of WIMPs

Galactic coordinates

Cygnus Constellation (l = 90°,b = 0°)

WIMP signal

After collision WIMP signal expected

  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

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SLIDE 7

c) Distribution spatiales des reculs

ZW XG YG ZG lW bW YW XW ϕR θR Recoil

  • Collision isotrope dans le CDM:

108 Events with ER = [5,50] keV

Map of recoils in galactic coordinates (HealPix)

  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

There are many “angles” for nuclear recoils…

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SLIDE 8

There are many angles to measure… A lot of information and important events to detect

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

19F recoils (Ekin= 1-110 keV)

Angular distribution in the laboratory (with respect to the neutron direction) Produced by neutrons of 565 keV Validated experimentally at Cadarache !!

19F recoils (Ekin= 1- 40 keV)

Angular distribution in the laboratory Produced by neutrons of 200 keV Geant4 simulations ( N. Sauzet, DS. (2016)) The same kind of distributions for C !!

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SLIDE 9

a) Simulation d’une mesure réaliste

Wimp recoils Background 100 WIMP evts + 100 Background evts

Méthode de vraisemblance

  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

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SLIDE 10

Proof of discovery: Signal pointing toward the Cygnus constellation Blind likelihood analysis in order to establish the galactic origin of the signal

Latitude galactique Longitude galactique

Signature angulaire

100 WIMP + 100 BKG

Strong correlation with the direction of the Constellation Cygnus even with a large background contamination

Phenomenology: Discovery

  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

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SLIDE 11

Mass – cross section Galactic Halo shape Dark Matter signature

8 parameters simultaneouly constrained by only one 3D experiment

Mass Cross section σx σy σz l b

Directional Detection : identification

  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

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SLIDE 12

Running in an Underground Laboratory

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SLIDE 13

MIMAC: Detection strategy

Evolution of the collected charges on the anode Scheme of a MIMAC µTPC

Measurement of the ionization energy: Charge integrator connected to the mesh coupled to a FADC sampled at 50 MHz

E~ 200 V/cm E~ 30 kV/cm

Drifting properties: V ≈ 20 µm/ns

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 14

The MIMAC project

A low pressure multi-chamber detector

  • Energy and 3D Track measurements
  • Matrix of chambers (correlation)
  • µTPC : Micromegas technology
  • CF4, CHF3, and 1H : σ(A) dependancy
  • Axial and scalar weak interaction
  • Directionnal detector

Strategy:

  • Directional direct detection
  • Energy (Ionization) AND 3D-Track of the recoil nuclei
  • Prove that the signal “comes from Cygnus ”

Bi-chamber module 2 x (10.8x 10.8x 25 cm3)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 15

MIMAC experiment

MIMAC Target:

  • Light WIMP mass
  • Axial coupling

MIMAC-bi-chamber module prototype

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SLIDE 16

3D Tracks: Drift velocity

  • New mixed gas MIMAC target : CF4 + x% CHF3 (x=30)

Magboltz Simulation

Too fast

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 17

Time [ns]

1000 2000

A [ADC-Channels]

1000 2000

τ

Energy

Time [ns]

1000 2000

[ADC-Channels/ns] dA dt

5 10 peak

µ σr σl Apeak

preamplifier signal + FADC: Energy 3D - track

MIMAC readout

Dedicated fast electronics (self-triggered) Based on the MIMAC chip (64 channels)

  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

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SLIDE 18

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

Ionization Quenching Factor Measurements at LPSC-Grenoble

19F ( 3 keV) in CF4 (50 mbar)

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SLIDE 19

Portable Quenching Facility (COMIMAC)

(Electrons and Nuclei of known energies)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

Electrons of 7 keV In a gas detector the IQF depends strongly on the quality of the gas. The IQF needs to be measured periodically (in-situ) in a long term run experiment.

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SLIDE 20

Ionization Quenching Factors

Simulations and Measurements (LPSC)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 21

0,000 ¡ 0,100 ¡ 0,200 ¡ 0,300 ¡ 0,400 ¡ 0,500 ¡ 0,600 ¡ 0,700 ¡ 0,800 ¡ 0,900 ¡ 0 ¡ 10 ¡ 20 ¡ 30 ¡ 40 ¡ 50 ¡ 60 ¡

Quenching ¡Factor ¡ Recoil ¡Energy ¡(keV) ¡

Ioniza9on ¡Quenching ¡Factor ¡for ¡Fluorine ¡ ¡ in ¡pure ¡CF4 ¡at ¡50 ¡mbar ¡ ¡ ¡

Fluorine ¡in ¡ CF4 ¡at ¡50 ¡ mbar ¡ He ¡in ¡He ¡+ ¡ 5% ¡C4H10 ¡at ¡ 350 ¡mbar ¡

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SLIDE 22

IQF in 4He + 5% isobutane for different pressures!!

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

10 20 30 40 50 10 20 30 40 50 60 70 80 Total kinetic Energy (keV) Quenching Factor (%)

Pressure : 350 mbar 700 mbar 1000 mbar 1300 mbar

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SLIDE 23

MIMAC validation with neutrons

Neutron monochromatic field: AMANDE facility at IRSN of Cadarache

– Neutrons with a well defined energy from resonances of 7Li by a (p,n) reaction

DM-France, Paris, Dec 1st 2016

ERecoil = 4 mnmR mn + mR

( )

2 Eneutron cos2θ

Protons beam

7Li target

MIMAC one chamber proto

Calibration:

55Fe (5.9 keV) and 109Cd (3.1 keV)

sources

  • D. Santos (LPSC Grenoble)
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SLIDE 24

Electron/recoil discrimination

Neutrons F , C, H, nuclear recoils Electrons

7Li (p,n (565 keV)) nuclear reaction

electron integrated rejection

Electron-recoil Discrimination

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SLIDE 25

Observables

22 observables built using the MIMAC readout…. and more … (Q. Riffard et al. arXiv: 1602.01738 (2016))

NR + e- Only e- NR + e- Only e-

With fast neutrons

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SLIDE 26

Neutron kinetic energy distribution

IDM2016, 7/21/16

Focusing on the “Fluorine Endpoint”:

  • ionization

energies above 50 keV

  • theta < 0.5

rad max ~ 550 keV

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SLIDE 27

Neutron kinetic energy distribution

IDM2016, 7/21/16

27

Method Neutron kinetic energy (mean ± 1σ) [keV] “Simple” = Joining barycenters of the extreme timeslices 542.8 ± 25.6 Fit of the centroids 541.3 ± 23.8 Fit of every (x,y,z) coincidence 545.8 ± 23.4 Principal Component Analysis 545.7 ± 23.5

/!\ Extrapolating the quenching factor above the measured range Focusing on the “Fluorine Endpoint”:

  • ionization

energies above 50 keV

  • theta < 0.2

rad max ~ 545 keV

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SLIDE 28

Theta distribution

IDM2016, 7/21/16

Theta_simple (radians)

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SLIDE 29

MIMAC (bi-chamber module)at Modane Underground Laboratory (France) since June 22nd 2012. Upgraded in June 2013, and in June 2014.

  • working at 50 mbar

(CF4+28% CHF3 + 2% C4H10)

  • in a permanent circulating mode
  • Remote controlled

and commanded

  • Calibration control twice per week

Many thanks to LSM staff

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 30

500 600

ADC Channel

100 200 300 400

Energy [keV]

2 4 6 8 10 12 14

Cd Cr Fe Cu Cu

Detector calibration (not at the maximum gain!)

Date

02/07/13 31/08/13 31/10/13

a [keV/ADC-Channel]

0.005 0.01 0.015

  • Ch. 1
  • Ch. 2

Calibration: (once a week)

X-ray generator producing fluorescence photons from Cd, Fe, Cu foils. Threshold ~ 1 keV

Circulation system:

Excelent Gain stability in time

10 12

Eioni [keV]

2 4 6 8

Count

100 200 300 400 500 Cd Cr Fe Cu Cu

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 31

An alpha particle crossing the detector

(as an illustration of the MIMAC observables)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

X-Y (anode) X-Z(t) Y-Z(t)

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SLIDE 32

A “recoil event” ( ~ 34 keVee)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 33

A “recoil” event (~ 40 keVee)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 34

An Electron event (18 keV)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 35

Radon progeny recoil signatures

222Rn chain:

  • 4 -decays

Electron event (background)

  • 4 -decays
  • particle emission:

Daughter nucleus recoil (surface event):

Saturation

222Rn

(3.8 days)

218Po

(3.1 min)

214Pb

(26.8 min)

214Bi

(19.8 min)

214Po

(0.2 ms)

210Pb

(22 years)

210Bi

(5.01 days)

210Po

(138 days)

206Pb

(stable)

Simulation (SRIM)

Radon Progeny

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SLIDE 36
  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

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SLIDE 37

RPR: « In coincidence » events

Chamber coincidences:

3D tracks from nuclear recoil

  • f radon progeny detection
  • Ch. 1
  • Ch. 2

218Po 214

Pb

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 38

Nuclear recoil spectra

First measurement of 3D nuclear-recoil tracks coming from radon progeny

MIMAC detection strategy validation

Mesure:{

Electron/recoil discrimination

First detection of 3D tracks of Rn progeny

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SLIDE 39

Mean Projected Diffusion as RPR event position identification

RPR events occur at different positions in the detector…

Anode C a t h

  • d

e Mean Projected Diffusion:

« Anode » event

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SLIDE 40

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

Simulation of 19F recoils diffusion observable (MDP)

  • f 10, 20 and 30 keV kinetic energies in the MIMAC

detector

Energy [keV]

5 10 15 20 25 30

MPD

1 2 3 4 5 6

  • 1

10 1 10

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SLIDE 41

Cathode Signal to place the 3D-track

  • The cathode signal is produced by the primary electrons. It

is produced before the anode signal produced by the avalanche.

(C. Couturier,Q. Riffard, N. Sauzet et al. in preparation ) Measurement in a MIMAC chamber of an alpha passing through the active volume parallel to the cathode at 10 cm distance.

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SLIDE 42

MIMAC-Cathode Signal measurements

(C. Couturier, Q. Riffard, N. Sauzet et al. 2016)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

Distance from grid [mm] 50 100 150 200 250 s] µ t [ ∆ 5 10 15 20 25 30 35 40

/ ndf

2

χ 7.701 / 10

retard

T 0.5266 ± 23.72

drift

v 1.139 ± 21.32 / ndf

2

χ 7.701 / 10

retard

T 0.5266 ± 23.72

drift

v 1.139 ± 21.32

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SLIDE 43

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

First controlled Fluorine tracks, using COMIMAC

For more info on COMIMAC: (Muraz et al. NIM A, 2016)

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SLIDE 44
  • D. Santos (LPSC Grenoble)

COMIMAC: first measurements on controlled tracks of Fluorine

25 keV (kinetic) Fluorine à ~ 9 keVee ionization

X [stripe #]

120 122 124 126 128 130 132 134 136

Y [stripe #]

120 122 124 126 128 130 132 134 136

hAnode

Entries 320 Mean x 128.8 Mean y 129.2 RMS x 1.625 RMS y 1.486

2 4 6 8 10 12 hAnode

Entries 320 Mean x 128.8 Mean y 129.2 RMS x 1.625 RMS y 1.486

Anode projection

Time [timeslice #]

4 6 8 10 12 14 16 18 20 22

X [stripe #]

120 122 124 126 128 130 132 134 136

hZX

Entries 320 Mean x 14.43 Mean y 128.8 RMS x 3.057 RMS y 1.623

1 2 3 4 5 6 hZX

Entries 320 Mean x 14.43 Mean y 128.8 RMS x 3.057 RMS y 1.623

X/Time projection

Time [timeslice #]

4 6 8 10 12 14 16 18 20 22

Y [stripe #]

120 122 124 126 128 130 132 134 136

hZY

Entries 320 Mean x 14.35 Mean y 129.2 RMS x 3.014 RMS y 1.486

1 2 3 4 5 6 hZY

Entries 320 Mean x 14.35 Mean y 129.2 RMS x 3.014 RMS y 1.486

Y/Time projection

6 mm 2.5 mm 2.5 mm 2.5 mm

DM-France, Paris, Dec 1st 2016

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SLIDE 45

# timeslices 2 4 6 8 10 12 14 16 18 20 22 24 Count 500 1000 1500 2000 2500 3000 3500 hTimeslice Entries 12227 Mean 10.04 RMS 3.962

hTimeslice

COMIMAC: first controlled tracks of 19F

8 keV kinetic à 2 keVee

12 timeslices * 20 ns/timeslices * 23.5 µm/ns = 5.8 mm 8 timeslices * 20 ns/timeslices * 23.5 µm/ns = 3.8 mm

  • C. Couturier, I. Moric, Y. Tao et al. (in preparation)

25 keV kinetic à 9 keVee

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 46

COMIMAC: first measurements on controlled tracks of Fluorine

Couturier et al. (in preparation)

Ionization energy (keV) 1 2 3 4 5 6 7 8 9 Angular resolution (deg) 12 14 16 18 20 22 24 26 28

  • Track

length

  • Angular resolution

Ionization energy (keV) 1 2 3 4 5 6 7 8 9 Track length (mm) 1 2 3 4 5 6

PRELIMINARY PRELIMINARY

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 47
  • Emulsion

layers

target = C (low masses), Ar, Br, Kr (high masses)

Directional detection:

comparison of strategies

  • Anisotropic

crystals

target = O (low masses), Zn, W (high masses)

  • Low pressure

TPCs

target = F

X [stripe #] 120 122 124 126 128 130 132 134 136 Y [stripe #] 120 122 124 126 128 130 132 134 136 hAnode Entries 320 Mean x 128.8 Mean y 129.2 RMS x 1.625 RMS y 1.486 2 4 6 8 10 12 hAnode Entries 320 Mean x 128.8 Mean y 129.2 RMS x 1.625 RMS y 1.486

Anode projection

Time [timeslice #] 4 6 8 10 12 14 16 18 20 22 X [stripe #] 120 122 124 126 128 130 132 134 136 hZX Entries 320 Mean x 14.43 Mean y 128.8 RMS x 3.057 RMS y 1.623 1 2 3 4 5 6 hZX Entries 320 Mean x 14.43 Mean y 128.8 RMS x 3.057 RMS y 1.623

X/Time projection

Time [timeslice #] 4 6 8 10 12 14 16 18 20 22 Y [stripe #] 120 122 124 126 128 130 132 134 136 hZY Entries 320 Mean x 14.35 Mean y 129.2 RMS x 3.014 RMS y 1.486 1 2 3 4 5 6 hZY Entries 320 Mean x 14.35 Mean y 129.2 RMS x 3.014 RMS y 1.486

Y/Time projection

No tracks ; only statistical distributions (!) D'Ambrosio et al. 2014 Capella et al. 2013

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
slide-48
SLIDE 48
  • Emulsion

layers

Directional detection: comparison of strategies

  • Anisotropic

crystals

  • Low pressure

TPCs

~1 mm (105 times longuer !!) ~10 nm

(SRIM simulations)

~100 nm

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 49

SRIM simulations…

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 50

SRIM simulation of O (20 keV) in ZnO4W

showing the secondary recoils

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 51

C (22 keV) in emulsion (SRIM simulation)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

In emulsions and solids the transverse development is in general greater than the longitudinal !!

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SLIDE 52

Directional detection: Directionality ‘D’

For more information on the comparison: Couturier et al. (JCAP 2016) Initial direction of the recoil ​ 𝜄 ↓𝑗 Direction at collision i collision i

Directionality D (preservation of the direction)

Crystal Emulsion TPC DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
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SLIDE 53

MIMAC – 1m3 = 16 bi-chamber modules (2x 35x35x26 cm3)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

i) New technology anode 35cmx35cm ii) Stretched thin (12 um) grid at 512um. iii) New electronic board (1920 channels) iv) Only one big chamber New 20cmx20cm pixellized anode (1024 channels)

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SLIDE 54

New 35 x 35 cm2 low background detector design

(1920 channels) (O. Guillaudin et al. 2016)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

! !

Left: Top view of the new detector design using kapton and plexiglass instead of PCB. Right: Bottom view, showing the ASICs distribution to minimize the length of the connections.

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SLIDE 55

New low background MIMAC detector prototype (10cmx10cm, 512 channels)(11/2016)

(O.Guillaudin et al. (2016))

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
slide-56
SLIDE 56

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

30 kg.yr, 90% CL lower limits

Exclusion limits

A: 5 keV (threshold) no background 3D track with head-tail angular resolution 20o B: 20 keV background= 10evt/kg yr angular resolution 50o 3D with no head-tail

slide-57
SLIDE 57

Exclusion curves for MIMAC (1 and 50 m3)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
slide-58
SLIDE 58

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

WIMP Light Mass window MIMAC- NEWS complementarity

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SLIDE 59

i) A new directional detector of nuclear recoils at low energies has been developed giving a lot of flexibility on targets, pressure, energy range… ii) Ionization quenching factor measurements have been determined experimentally and they can be checked in-situ. iii) Phenomenology studies performed by the MIMAC team show the impact of this kind of detector. iv) MIMAC bi-chamber module has been installed at Modane Underground Laboratory in June 2012. An upgraded versions in June 2013 and June 2014 and it shows an excellent gain stability. v) For the first time the 3D nuclear recoil tracks from Rn progeny have been observed. vi) New degrees of freedom are available to discriminate electrons from nuclear recoils to improve the DM search for. vii) Angular resolution and directional studies of 3D tracks are now possible with COMIMAC. viii) The 1 m3 will be the validation of a new generation of a large DM high definition detector including directionality (a needed signature for DM discovery)

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)

Conclusions

slide-60
SLIDE 60

CYGNUS 2017- International Workshop Jinping (CHINA) – June 13th- 15th 2017

slide-61
SLIDE 61

Discovery at 3σ With BKG (300) Without BKG à Even with a large number of background events, discovery is still possible à Only low number of WIMP events are required at low masses à A discovery (>3σ @90%CL) with BKG is possible down to 10-3-10-4 pb

Estimation of the discovery potential

MIMAC characteristics

  • 10 kg CF4
  • DAQ : 3 years
  • Recoil energy range [5, 50] keV

MIMAC Phenomenology: Discovery

MSSM NMSSM

  • D. Albornoz-Vasquez et al., PRD 85

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
slide-62
SLIDE 62

Directional Dark Matter: discovery/exclusion

  • discovery (5σ)

Up to 10-4 pb

0 WIMP, 300 bkg

  • exclusion

Up to 10-6 pb

100 WIMP, 100 bkg

Simulated data

  • 30 kg.year CF4
  • Recoil energy [5, 50] keV
  • Angular resolution : 15°

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
slide-63
SLIDE 63

Détection directe : contenus en spin

19F : contenu en spin selon

les auteurs

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
slide-64
SLIDE 64

TPC directional detectors

DRIFT MIMAC NEWAGE DMTPC Boulby Modane Kamioka SNOLAB Gas mix 73%CS2 +25%CF4 +2%O2 70%CF4 +28%CHF3 +2%C4H10 CF4 CF4 Current volume 800 L 6 L 37 L 1000 L Drift ion, 50 cm e−, 25 cm e−, 41 cm e−, 27 cm Threshold (keVee) 20 1 50 20 Readout Multi-Wire Proportional Counters Micromegas micro-pixel chamber +GEM CCD Adapted from Mayet et al. [arXiv:1602.03781]

DM-France, Paris, Dec 1st 2016

  • D. Santos (LPSC Grenoble)
slide-65
SLIDE 65

At the galaxy cluster scale…

Non-baryonic matter is 6 times more important than baryonic one…

(1E0657-558) Z= 0.296 Total mass profiles Baryonic Matter

  • D. Santos (LPSC Grenoble)

DM-France, Paris, Dec 1st 2016

slide-66
SLIDE 66

Détection directe : principes

Détection directe : mesure de l’énergie déposée lors de la diffusion élastique WIMP-noyau

  • énergie typique : 1-100 keV
  • Taux d’événements très faible

Noyau cible

détecteur basse énergie

En tenant compte de la distribution de vitesse f(v), du facteur de forme F(q) :

nucléaire Astro SUSY ou Autres…