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Precision measurements of the beta Precision measurements of the beta neutrino correlation in the WI neutrino correlation in the WI

Electrostatic Ion TrapElectrostatic Ion Trap

Sergey Vaintraub

Where to search for beyond SM Physics?

Sergey Vaintraub

Brute force (“Swifter, Higher, Stronger”):•Go higher in energy/luminosity• LHC/Tevatron/ILC

Finesse:•High precision experiments•Detect the effect of beyond SM on low energy observables•For example βν correlation measurements

6Li daughter nucleus e- Electron

eElectron anti-neutrino

New physics beyond the Standard Model’s V-A structure

Pure Gamow-Teller

6He beta decay

Sergey Vaintraub

βν correlation

Trap chamber

30o

magnetNeutron generator

EIBT

1 m

Setup scheme

Sergey Vaintraub

Electrons detector

MCP MCP

Entrance mirrorExit mirror

Electrons collected at position sensitive plastic scintillator6Li ions collected at MCP detectors

6Li+

+

e-

6He beta decay at EIBT

Sergey Vaintraub

Electrons detector

MCP MCP

Entrance mirrorExit mirror

Some of 6Li ions will miss MCP at its periphery

6Li+

+

e- -

e and are in the same direction, hence momentum of recoiling 6Li is maximum AND in the opposite direction.

Sergey Vaintraub

Electrons detector

MCP MCP

Entrance mirrorExit mirror

Some of 6Li ions will go though MCP hole

6Li+

+

e-

-

e and are in opposite directions, hence momentum of recoiling 6Li is small.

Sergey Vaintraub

Losses Mechanisms

Sergey Vaintraub

e

e

eSM E

pHedW cos311)(6

Statistical precision

In order to go below 1% statistical precision one should accumulate about one million coincidences Sergey Vaintraub

Present SetupPresent Setup

DT-NGfurnace 300

magnet

EBIT Beam optics

7 m

Trap chamber

Setup StatusSetup Status

A. Neutron GeneratorA. Neutron Generator

DT-NG

D + T → n + 4He   En = 14.2 MeV, Production rate~1010 n/s Ordered from VNIIA (Russia).

DT-NGfurnace 300

magnet

EBIT Beam optics

7 m

Trap chamber

Setup StatusSetup Status

B. Furnace + BeO targetB. Furnace + BeO target

• The 14 MeV neutrons hit a hot (1500K) BeO target, as a result , 6He nuclei are produced.

• Ordered from HeatWave (USA). (ETA - Winter 2011).Porous BeO 80 mm x 2 mm discs delivered and stored

6He

DT-NGfurnace 300

magnet

EBIT Beam optics

7 m

Trap chamber

Setup StatusSetup Status

C. Accumulator and BuncherC. Accumulator and BuncherEBIT - DREBIT (Dresden,

Germany)Neutral 6He enter the EBIT,

ionized, accumulated and bunched.

Custom made for efficient 6He injection

DT-NGfurnace 300

magnet

EBIT Beam optics

7 m

Trap chamber

Setup StatusSetup Status

D. Trap ChamberD. Trap Chamber Stable isotopes trapping Detectors:

MCP’s Plastic Scintillator with

multiple photomultipliers

Electronics – ADC, TDC,…

Summary

Sergey Vaintraub

Present setup offers significant advantages over other schemes:

• Large solid angle for recoils and electrons.

• Field-free inner region.

• Full reconstruction of the e-ν angle.

• Ease-of-operation and portability. • Complementary to other methods (different systematic errors)

• “Continuous” operation (no “beam time”…)

• Easily adapted for other radioactive species.

Collaborations• Weizmann group

Michael HassOded HeberMichael RappaportAnukul DhalDirk SchwalmDavid MelnikAlexander Prygarin

• Soreq (SARAF) group Tsviki HirshDan BerkovitsIsrael Mardor

• MPIK groupKlaus BlaumAndreas Wolf

Sergey Vaintraub