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Study of  7 Be relativistic fragmentation in nuclear track emulsion

Study of  7 Be relativistic fragmentation in nuclear track emulsion. Denis Artemenkov, VBLHE, JINR ( for the BECQUEREL collaboration ). BECQUEREL at the JINR Nuclotron is devoted systematic exploration of clustering features of light stable and radioactive nuclei.

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Study of  7 Be relativistic fragmentation in nuclear track emulsion

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  1. Study of 7Be relativistic fragmentation in nuclear track emulsion Denis Artemenkov, VBLHE, JINR (for the BECQUEREL collaboration)

  2. BECQUEREL at the JINR Nuclotron is devoted systematic exploration of clustering features of light stable and radioactive nuclei. The fragmentation of a large variety of light nuclei was investigated using the emulsions exposed to few A GeV nuclear beams at JINR Nuclotron. A nuclear track emulsion is used to explore the fragmentation of the relativistic nuclei.

  3. Study of  relativistic7Be fragmentation in nuclear track emulsion in JINR 12C7Be (in mixed beam of 12N+10C+7Be at 1.2 A GeV) 2006 7Li7Be (charge exchange, at 1.2 A GeV) 2004 Table 1. Charge composition of the fragments in events with Q=4

  4. Ion Physics Electromagnetic Dissociation • Electromagnetic dissociation is liberation of nucleons or nuclear fragments as a result of electromagnetic field by exchange of virtual photons, rather than the strong nuclear force • It is important for relativistic nuclear-nuclear interaction, especially where the proton number of the nucleus is large • G4EMDissociation model and cross section are an implementation of the NUCFRG2 (NASA TP 3533) physics and treats this electromagnetic dissociation (ED). 5

  5. Data modeling of 7Be EM dissociation at 1.2 A GeV G4EMDissociation G4EMDissociationCrossSection Started: 3000 of 7Be nuclei at 1.2 A GeV Produced: 7 events of 7Be6Be+n; 6Be Atomic Mass: 6.0197258  0.0000059 amu Excess Mass: 18374.465  5.468 keV Binding Energy: 26924.058  5.468 keV Spin: 0+ Half life: 92 keV (5.010-6 fs) Mode of decay: 2 Proton to He-4 Decay energy: 1.372 MeV http://atom.kaeri.re.kr

  6. H 7Be He H p 6Be ? 4He 7Be p n n 7BeHe+2H 7Be6Be+n4He+21H+n

  7. 6Ве 5Li 12C7Be (in mixed beam of 12N+10C+7Be at 1.2 A GeV), 2006

  8. He 7Be 7Be2He 7Li7Be (charge exchange, at 1.2 A GeV) 2004

  9. 7Li7Be (charge exchange, at 1.2 A GeV) 2004 12C7Be (in mixed beam of 12N+10C+7Be at 1.2 A GeV) 2006

  10. Mean free path λinel λexp=14,2 ±0,2 cm (our experiment)

  11. Summary • The possibilities of nuclear track emulsion for study of fragmentation of relativistic light nuclei is shown. • The production of unstable 6Be in electromagnetic interactions of 7Be with emulsions nuclei is discussed. • The most probable channels for 7Be fragmentation are overviewed. Thank you for your attention!

  12. http://becquerel.jinr.ru/

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