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Becquerel for Juniors

Veksler and Baldin Laboratory of High Energies. Becquerel for Juniors. Supervisors: Pavel Zarubin Tatiana Shchedrina. Participants: Cristina Ni ţă – University of Bucharest Elena Horj –“Babe ş -Bolyai ” University, Cluj-Napoca Codrin Andrei – University “Al. I. Cuza”, Ia ş i.

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Becquerel for Juniors

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  1. Veksler and Baldin Laboratory of High Energies Becquerel for Juniors Supervisors: Pavel Zarubin Tatiana Shchedrina Participants: Cristina Niţă – University of Bucharest Elena Horj –“Babeş-Bolyai ” University, Cluj-Napoca Codrin Andrei– University “Al. I. Cuza”, Iaşi

  2. Synchrophasotron facility The fragmentation of a large variety of light nuclei was investigated using theemulsions exposed to few A GeV nuclear beams at JINR Nuclotron. 1 - accelerator ring Synchrophasotron2 - accelerator ring Nuclotron3-7 - cryogenic supply system

  3. Method steps: ►Beam preparing ►Emulsion arising ►Microscope scanning ► Measurements & analysis ►Publishing

  4. Literary data of emulsion composition BR2

  5. Microscopes

  6. Using emulsionprocedure… 28Si, p = 200 GeV/c “white” star The photograph shows the interactions vertex and a jet of fragments within a narrow angular cone. big star The photograph shows the interaction vertex, a jet of fragments of projectile and target-nucleus fragments.

  7. The advantages with respect to low energy researches are the following: • projectile nucleus fragments are collimated mostly in a narrow forward cone limited by an angle 0.2/P0, where P0 is a primary nucleus momentum; this allows one to obtain 3D image of separated tracks in a single emulsion layer, • ionization losses of projectile fragments correspond to the minimum and practically don’t distort measurements, • the detection energy threshold for projectile fragments is absent, • a record spatial resolution of emulsion (0.5 micron) provides a record angular resolution; the excitation scale of a fragmenting system in the projectile rest frame is of the order of few MeV per fragmenting nucleon; in the case of the projectile nucleus fragmentation perfect angular measurements play the determinative role in the estimation of the excitation energy scale while their momentum per nucleon may be taken the same as for an incoming nucleus

  8. We are in the LHE

  9. In the end… … we would like to thank Pavel Zarubin and Tatiana Shchedrina for the special attention given to us and also to all the organizers for the great experience we had at Dubna Summer School

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