Precision measurements of the beta
neutrino correlation in the WI
Electrostatic Ion Trap
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Sergey Vaintraub
Where to search for beyond SM Physics?
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
Sergey Vaintraub
6He
beta decay
6Li
e- Electron
daughter nucleus
βν correlation
Pure Gamow-Teller
q
ne Electron
anti-neutrino
New physics beyond the Standard Model’s
V-A structure

Sergey Vaintraub
Setup scheme
EIBT
30o
magnet
Neutron
generator
Trap
chamber
1m
Sergey Vaintraub
6He
beta decay at EIBT
Electrons detector
e-
Exit mirror
Entrance mirror
6Li++
MCP
MCP
Electrons collected at position sensitive plastic scintillator
6Li ions collected at MCP detectors
Sergey Vaintraub
Electrons detector
e- n -
Exit mirror
MCP
Entrance mirror
6Li++
MCP
 e and n are in the same direction, hence momentum of
recoiling 6Li is maximum AND in the opposite direction.
Some of 6Li ions will miss MCP at its periphery
Sergey Vaintraub
Electrons detector
e-
Exit mirror
Entrance mirror
6Li++
MCP

n-
MCP
e and n are in opposite directions, hence momentum of
recoiling 6Li is small.
Some of 6Li ions will go though MCP hole
Sergey Vaintraub
Losses Mechanisms
 1 pe

dWSM ( He)  1 
cos qen 
 3 Ee

6
Sergey Vaintraub
Statistical precision
 In order to go below 1% statistical precision one should
accumulate about one million coincidences
Sergey Vaintraub
Present Setup
Setup Status
Trap
chamber
DT-NG furnace EBIT
Beam optics
300
magnet
7m
A. Neutron Generator

D + T → n + 4He En = 14.2 MeV,

Production rate~1010 n/s
Ordered from VNIIA (Russia).

DT-NG
Setup Status
Trap
chamber
DT-NG furnace EBIT
Beam optics
300
magnet
7m
B. 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
Setup Status
Trap
chamber
DT-NG furnace EBIT
Beam optics
300
magnet
7m
C. Accumulator and Buncher



EBIT - DREBIT (Dresden, Germany)
Neutral 6He enter the EBIT, ionized,
accumulated and bunched.
Custom made for efficient 6He
injection
Setup Status
Trap
chamber
DT-NG furnace EBIT
Beam optics
7m
D. Trap Chamber



Stable isotopes trapping
Detectors:
 MCP’s
 Plastic Scintillator with
multiple photomultipliers
Electronics – ADC, TDC,…
300
magnet
Summary
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.
Sergey Vaintraub
Collaborations
•
Weizmann group
Michael Hass
Oded Heber
Michael Rappaport
Anukul Dhal
Dirk Schwalm
David Melnik
Alexander Prygarin
• Soreq (SARAF) group
Tsviki Hirsh
Dan Berkovits
Israel Mardor
• MPIK group
Klaus Blaum
Andreas Wolf
Sergey Vaintraub