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De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Very preliminary results of Non Mesonic Weak Decays in FINUDA De Mori Francesca.

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Presentation on theme: "De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Very preliminary results of Non Mesonic Weak Decays in FINUDA De Mori Francesca."— Presentation transcript:

1 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Very preliminary results of Non Mesonic Weak Decays in FINUDA De Mori Francesca for the FINUDA Collaboration

2 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Outlook:  NMWD in hypernuclei  NMWD in FINUDA  Proton single nucleon spectra of various targets  Rare Decays of  Conclusions and prospects

3 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Non Mesonic Weak Decays In nuclear medium :  N  NN  NN  nNN (15%) Dominant in medium-heavy hypernuclei( A  12 ) Unique opportunity to study the four-baryons weak interaction

4 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 2 6 Li 1 7 Li 3 12 C 1 27 Al 1 51 V 5 cm OSIM ISIM TOF Target Beam pipe FINUDA allows in primis the measurement of emitted nucleon spectra from :

5 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Event selection of NMWD protons  Selected positive tracks from K - vertex with specific energy loss in the band of proton  Presence of pion track from K - vertex required with pion momentum corresponding to the production of the hypernucleus in the bound region

6 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 12 C target 7 Li target 51 V target 27 Al target Preliminary not acceptance-corrected -1.8 { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/13/4197093/slides/slide_6.jpg", "name": "De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 12 C target 7 Li target 51 V target 27 Al target Preliminary not acceptance-corrected -1.8

7 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Rare Decays of 4  He is unstable Pd~570 MeV/c Pt~510 MeV/c exploiting 6 Li target Some three-four body decay channels Possible 2-body decays of 4  He with charged particles

8 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Deuteron pair of rare decays selection ( 4  He d+d):  Looking for positive tracks from K - vertex  Looking for dE/dx over the proton band  Looking for a pair of tracks of this kind back to back with momentum greater than 400 MeV/c

9 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 PID (dE/dx in vertex silicon detectors) Momentum(MeV/c) dE/dx(OSIM)

10 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Angle between pairs of tracks P>400MeV/c sel.deuterons

11 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 First observation of 4  He d-d rare decay ten deuteron pairs observed

12 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Evento fujoka 2 d d

13 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 d d

14 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 d d 

15 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Conclusions & prospects  First very preliminary results of NMWD in FINUDA: single proton spectra from all 5 different targets  Clear evidence of rare non mesonic decay of 4  He never observed before  needed neutron identification: we are working on it  needed improved backtracking: we are working on it  needed better mass identification for back-tracking for deuteron momenta better reconstruction:we are working on it we are on the way to increase the number of good events

16 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 Contribute to the proton spectrum of the background reaction:

17 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004

18 De Mori Francesca,Turin University and INFN DAFNE04 Frascati, June 8 2004 O.Hashimoto et al. Phys.Rev.Lett.88:042503,2002 KEK-PS E307


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