Precision measurements of the beta neutrino correlation in the WI Electrostatic Ion Trap { Fundamental Interactions with Atom and Ion Traps Conference 3 December 2012 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 2 Sergey Vaintraub
6 He beta decay 6 Li e- Electron daughter nucleus βν correlation Pure Gamow-Teller q ne Electron anti-neutrino New physics beyond the Standard Model’s V-A structure 3 Sergey Vaintraub
Setup scheme EIBT 30 o magnet Neutron generator Trap chamber 1 m 4 Sergey Vaintraub
6 He beta decay at EIBT Electrons detector e- Exit mirror Entrance mirror 6 Li++ MCP Electrons collected at position sensitive plastic scintillator 6 Li ions collected at MCP detectors Sergey Vaintraub 5
Cosqen ~ 1 Electrons detector e- n- Exit mirror MCP Entrance mirror 6 Li++ MCP e and n are in the same direction, hence momentum of recoiling 6 Li is maximum AND in the opposite direction. Some of 6 Li ions will miss MCP at its periphery Sergey Vaintraub 6
Cosqen ~ -1 Electrons detector e- Exit mirror Entrance mirror 6 Li++ MCP n- e and n are in opposite directions, hence momentum of recoiling 6 Li is small. Some of 6 Li ions will go though MCP hole Sergey Vaintraub 7
Losses Mechanisms Sergey Vaintraub 8
Statistical precision In order to go below 1% statistical precision one should 9 accumulate about one million coincidences Sergey Vaintraub
Present Setup
Setup Status Trap chamber DT-NG furnace EBIT Beam optics 300 magnet 7 m A. Neutron Generator D + T → n + 4 He En = 14. 2 Me. V, Production rate~1010 n/s Ordered from VNIIA (Russia). DT-NG
Setup Status Trap chamber DT-NG furnace EBIT Beam optics 300 magnet 7 m B. Furnace + Be. O target • • The 14 Me. V neutrons hit a hot (1500 K) Be. O target, as a result , 6 He nuclei are produced. Ordered from Heat. Wave (USA). (ETA - Winter 2011). Porous Be. O 80 mm x 2 mm discs delivered and stored 6 He
Setup Status Trap chamber DT-NG furnace EBIT Beam optics 300 magnet 7 m C. Accumulator and Buncher EBIT - DREBIT (Dresden, Germany) Neutral 6 He enter the EBIT, ionized, accumulated and bunched. Custom made for efficient 6 He injection
Setup Status Trap chamber DT-NG furnace EBIT Beam optics 7 m 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. 15 Sergey Vaintraub
Collaborations • Weizmann group Michael Hass Oded Heber Michael Rappaport Anukul Dhal Dirk Schwalm David Melnik Alexander Prygarin • Soreq (SARAF) group Thank you! Tsviki Hirsh Dan Berkovits Israel Mardor • MPIK group Klaus Blaum Andreas Wolf Sergey Vaintraub
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