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The WITCH experiment: campaign 2006 and perspectives

Discover the advancements in the Weak Interaction Trap for Charged Particles experiment conducted in 2006 and explore future possibilities in particle physics. The experiment aims to probe the V-A interaction in the Standard Model through the study of weak interactions of β-decay. The paper outlines the experiment's setup, current status, 2006 results, and potential future directions, including improved accuracy and expansion of the physics program. The team welcomes new suggestions and collaborations to enhance their research. The study showcases the first observed recoil ion spectrum, reflecting a significant improvement in the experiment's efficiency. Join us in the exploration of weak interactions and the search for heavy neutrinos in this innovative research endeavor.

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The WITCH experiment: campaign 2006 and perspectives

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  1. The WITCH experiment: campaign 2006 and perspectives Valentin Kozlovon behalf of the WITCH team: S. Coeck 1), M. Herbane 1), V. Kozlov 1), N. Severijns 1), M. Tandecki 1), M. Beck 2), P. Friedag 2), P. Delahaye 3), A. Herlert 3), F. Wenander 3), D. Záckouký 4)1) IKS K.U.Leuven, 2) IKP Uni Muenster, 3) CERN, 4) NPI ASCR (Prague) ISOLDE Workshop, 12-14 February 2007 Weak Interaction Trap for CHarged particles

  2. Outline Experiment / Setup Present status Results of 2006 Future possibilities Conclusion Weak Interaction Trap for CHarged particles

  3. ? ? Standard Model: V-A interaction Primary goal Weak Interactions of -decay: (S) (V) (T) (A) (P) 95% C.L. 1) N. Severijns, M. Beck, O. Naviliat-Cuncic, Rev. Mod. Phys. 78 (2006) Weak Interaction Trap for CHarged particles

  4. b+ ne Vector 1 b+ Scalar 0.8 Vector 0.6 0.4 ne 0.2 Scalar 200 500 400 100 300 0 Recoil energy (eV) Physics principle -angular correlation: = Weak Interaction Trap for CHarged particles

  5. Einzellens Post acceleration Energy analysis by retardation B [T] Uret [V] 90 bender Experimental set-up Weak Interaction Trap for CHarged particles

  6. Efficiencies Weak Interaction Trap for CHarged particles

  7. November’06 124In: On/Off Weak Interaction Trap for CHarged particles

  8. Preliminary! 1+: 0.1, 2+: 0.74, 3+: 0.12, 80% 124mIn + 20% 124gIn Trap load: 1e+5 ions November’06: 124In recoil spectrum 124gIn: Rend= 196 eV 124mIn: Rend= 83 eV Tmeas(eff.) = 500 cycles x 2.3 s or 1150 s Weak Interaction Trap for CHarged particles

  9.  offline measurement 60Co activity = 11kBq Tmeas(eff.) = 10000 cycles x 2.3 s or 2.3e+4 s Weak Interaction Trap for CHarged particles

  10.  offline measurement 90Sr activity ~ 40kBq Tmeas(eff.) = 700 cycles x 2.3 s or 1610 s Weak Interaction Trap for CHarged particles

  11. Retardation is OFF Retardation is ON QDC channel (a.u.) QDC channel (a.u.) Pulse-height-distributions (PHD) Courtesy of M.Beck Weak Interaction Trap for CHarged particles

  12. Cooler trap Decay trap He-inlet to be changed by scintillator Pumping diaphragm • To have normalization between different trap loads • To have start signal for TOF measurement • To evaluate b-background on the main detector on-line • …? In-trap b-detector Weak Interaction Trap for CHarged particles

  13. More physics • Tensor interactions • F/GT mixing ratio • EC/b+ ratio • Charge state distribution • Search for heavy neutrinos(kinks in the recoil spectrum) • Precise b-spectrum shape measurement • …? Weak Interaction Trap for CHarged particles

  14. Conclusion • Primary goal is to probe the Standard Model for Scalar admixture • WITCH set-up is operational • Efficiency of the set-up was improved by factor of 200 • First recoil ion spectrum is observed! • Plan 2007: improve the accuracy of measurement • We are looking to extend our physics program and are open for any interesting suggestions! Weak Interaction Trap for CHarged particles

  15. 124In isotope data • 124gIn: http://ie.lbl.gov/toi/nuclide.asp?iZA=490124 • 124mIn: http://ie.lbl.gov/toi/nuclide.asp?iZA=490424 Weak Interaction Trap for CHarged particles

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