Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Non-Baryonic Dark Matter:From the CMB and axial direct detection

Daniel SantosLaboratoire de Physique Subatomique et de Cosmologie

Grenoble

(CNRS/IN2P3-UJF-ENSPG)

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Angular Power Spectrum in Temperature WMAP (2006)

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

CDM modelCMB + Lyman-alpha + clusters + supernovae

Age : 13.7 Gyr

Composition :

Geometry : flat inflation (?)

0.93 ± 0.03ns

0.71 ± 0.04h

0.27 ± 0.04m

0.022 ± 0.001bh2

0.73 ± 0.04

1.02 ± 0.02tot

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Galactic Halo existence justifies local measurements

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Direct detection strategies

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

The lightest neutralino

lowest mass linear superposition of superpartners of the gauge and higgs bosons:

~ ~ ~ ~ ~

= a1B + a2W3 + a3H1 + a4H2

neutral, colorless, only weak interaction stable with R-parity conservation non-relativistic at decoupling CDM relic density can be compatible with cosmological observations

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

3He for axial detection of non-baryonic dark matter

spin 1/2 nucleus axial interaction with

high signal/noise ratio : energy range ~ 1-5 keV

sensitive to M (WIMP) > 6 GeV

neutron capture signature: n + 3He p + 3H + 764 keV

very low sensivity to -rays

no intrinsic X-rays

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Direct Detection of SUSY particlesElastic diffusion -quark :

• spin dependent (axial)

SD(AX) α SD(p) × A2

• spin independent (scalar)

SI(AX) α SI (p) × A4

For 3He and 19F : SD » SI

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Cross section 3He- and event rate in MIMAC-He3 (10kg)

• 0.02< Ωh2< 0.15• Accelerator constrains

Exclusion curve for background 10-3 kg-1jour-1

Neutralino mass (GeV/c2)

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Complementarity with scalar detection

SD and SI not correlated

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Ionization ratio simulation (SRIM)

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

R&D: MIMAC-He3: (MIcro-tpc MAtrix of Chambers

of Helium 3)

LPSC (Grenoble) : D. Santos, F. Mayet, R. Brissot

Coordinateur technique : O. Guillaudin

- Electronique : O. Bourrion, G. Bosson, J-P. Richer - Mécanique : Ch. Fourel, T. Cabanel - Source d’ions : T. Lamy, J-C. Curdy, , P. Sole

ILL (Grenoble) : P. Van Esch, B. Guerard, G. Manzin

Dapnia-Saclay : P. Colas, I. Giomataris

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

MIMAC-He3: (MIcroTPC MAtrix of Chambers of He 3)

spatial High temporal resolution energetic

recoil track projection energy threshold < 1 keV electron/recoil discrimination

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Range vs. EnergyHe3 recoils Electrons

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

a/b ratio = f (pressure)L~10 cm

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Time collection = f(pressure)

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Diffusion of primary electrons

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Source 3He, 4He, 1H ( LPSC-Grenoble)

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

MIMAC source spectrum at 14kV MIMAC source spectrum at 14kV

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Recoil energy distribution after a polypropilene foil of 0.44μg/cm2

for acceleration energies of 45 and 50 keV

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Time of flight measurement of the ion coming out of the MIMAC source at 50 kV

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Ionization measured in the range of a few keV (in 4He )

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Beijing, August 28th 2006 2nd Sino-French Workshop on the Dark UniverseDaniel Santos

Conclusions

• The nBDM search is an open problem• The axial interaction should be explored• 3He is a very interesting target• A matrix with different targets including 19F at

high pressure (2 bar ) is a natural possible extension

• The quenching factor measurement in 3He and 4He is inminent

• The collaboration is open to people interested !