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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
magnet
Neutron 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 cos
3
11)(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 StatusSetup 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 StatusSetup 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 StatusSetup StatusSetup Status
C. Accumulator and BuncherC. Accumulator and Buncher
EBIT - 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 StatusSetup 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