Download presentation

Presentation is loading. Please wait.

Published byHannah Cole Modified over 4 years ago

1
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 Examining bounds states with FINUDA FINUDA COLLABORATION Stefano Piano

2
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 -Hypernuclei Present knowledge: Only one -hyp. bound state found: 4 He ( ) Pratically no data in heavier systems Possible explanations : a) [ A] B: previous expt.s were unable to detect B b) N N previous expt.s were unable to discriminate S/N c) no B bound system nothing to be seen ! FINUDA can detect the formation and decay of -hypernuclei in the (K - stop, ) reaction due to its tracking capabilities A -hyp. forms when a substitutes a N into a nucleus (S=-1) R.S. Hayano et al., Phys. Lett. B 231 (1989) 355 T. Nagae et al., Phys. Rev. Lett. 80 (1998) 1605 4 He

3
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 How to dig-out -hypernuclei with FINUDA K - stop + A B + prompt + N + N -hyp simulated event Reaction steps

4
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004

5
Silicon Vertex Detector PID Inner microstrip layer Outer microstrip layer

6
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 + prompt x - + prompt x p + prompt x - x p + prompt in coincidence with daughter particles + + prompt + prompt x - p K - stopped + 12 C 12 -Be + + prompt + p + n p + -

7
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 K - stopped + 12 C 12 -Be + + prompt + p + n p + - … due to 12 -Be ??? due to proton contamination predicted ~ 4-7 MeV (*) (*) E.Oset et al, Phys. Rep. 188(1990)79

8
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 M [ p -] = 1114 MeV/c 2 Topology of a -hyp event for 12 C - + prompt p K - vertex: + 176 MeV/c p 500 MeV/c - 158 MeV/c K - + 12 C 12 - Be + + prompt 12 - Be 12 Be + + n - + p

9
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - + prompt p Topology of a -hyp event for 12 C - + prompt p vertex 12 - Be vertex Front view Side view Central region

10
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 K - stopped + 12 C 12 -Be + + prompt + p + n p + - [ - p] invariant mass distribution; ( +, -, p) coincidence Invariant mass, MeV/c 2 Entries / 4 MeV/c 2 needs to be improved !!!

11
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - + prompt p + Topology of a -hyp event for 6 Li + + prompt - p vertex Central region front view

12
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - + p Topology of a -hyp event for 51 V - + prompt p vertex 49 - Sc vertex Central region side view

13
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 Summary FINUDA/DA NE a unique facility for -hyp studies Initial analysis yields positive expectations for bound B beyond A=4 Improve data analysis: –Better pattern recognition increases a statistics: x3 –Better definition of improves (conversion reaction) invariant mass –Further improve to p PID Strategy for future analysis: –tune-up analysis for the reference nucleus 12 C –go for 6,7 Li, 27 Al and 51 V –have a glance at 0/+ -hyps –get theorists involved

14
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 A first glance at 6 Li

15
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - + p + K - vertex: + 151 MeV/c p 271 MeV/c - 127 MeV/c K + vertex: + 236 MeV/c (p + - ) Inv. Mass = 1116 MeV/c 2 K - + 6 Li ( 5 He+ - ) + + ( 5 He+ - ) 3 H + + n +n Topology of a -hyp event for 6 Li

16
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - + p + K-K- K+K+ + + - p Topology of a -hyp event for 6 Li

17
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - + p + K-K- K+K+ + + - p Topology of a -hyp event for 6 Li

18
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 27 Al target: typical event - + p K - vertex: + 149 MeV/c p 156 MeV/c - 142 MeV/c (p + - ) Inv. Mass = 1117 MeV/c 2 K - + 27 Al ( 26 Mg+ - ) + + ( 26 Mg+ - ) 25 Na + + n

19
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 27 Al target: typical event - + p K+K+ K-K- - p +

20
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 51 V target: typical event - + p K - vertex: + 163 MeV/c p 248 MeV/c - 124 MeV/c (p + - ) Inv. Mass = 1110 MeV/c 2 K - + 51 V ( 50 Ti+ - ) + + ( 50 Ti+ - ) 49 Sc + + n

21
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 51 V target: typical event - + p K+K+ K-K- - p +

22
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 Sigma Hypernuclei in FINUDA K stopped + A B + prompt + N + N

23
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 Monte Carlo simulations of S -hypernuclei binding energies and width are taken from: E.Oset et al., Phys. Rept. 188 (1990) 79 bound nucleons have Fermi mom. S mom. distr. prob. dens. funct. final state particles tested for Pauli kinematics of f.s.p. feeds GEANT3 (geom., en. loss, trajectories) E.Oset, A.Ramos, I.Vidana, private communication 2p 1s tot

24
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 K stop + 12 C 2p 1s tot 2p 1s tot 2p 1s tot

25
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 Monte Carlo simulations of background reactions: p - -spectra K - n - p - K - p + - K - p - + - n - K - (NN) - N - n - K - n 0 - TOT

26
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 Monte Carlo simulations of background reactions: p - -spectra +,0 -hyp region

27
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 Monte Carlo simulations of background reactions: p + -spectra - -hyp region K - p - + K - p + - + n + K - (NN) + N + n + TOT

28
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - Hypernuclei at 1.1 T trigger: + 17% of K + K - tagging with: – + prompt, -, p – two vertices – : invariant mass Starting-line

29
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - Hypernuclei at 0.6 T trigger: + prompt Þ 56% of 12 - Be improved tagging better track and vertex fitting Finishing-line

30
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 - Hypernuclei in FINUDA at 0.6 T vertex region

31
Stefano Piano, FINUDA Collaboration – da ne 2004 - Frascati, 7 th – 11 th June 2004 +/o Hypernuclei in FINUDA trigger: - prompt tagging with: – - prompt, -, p – two vertices – : invariant mass background: o & quasi-free reactions

Similar presentations

OK

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.

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.

© 2018 SlidePlayer.com Inc.

All rights reserved.

By using this website, you agree with our use of **cookies** to functioning of the site. More info in our Privacy Policy and Google Privacy & Terms.

Ads by Google

Ppt on human chromosomes 13 Ppt on old age problems in india Training ppt on 5s Ppt on mapping space around us Ppt on power system stability examples Ppt on renewable energy source biomass Ppt on mechanical power transmission Ppt on 14 principles of management Ppt on aerobics exercises Ppt on global warming with pictures