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232 Th fission fragment angular distribution (FFAD)

Fission fragment angular distributions and isotopic distributions L. Tassan-Got and n_TOF and SOFIA. 232 Th fission fragment angular distribution (FFAD). Detection of the 2 fission fragments Fission direction given by the positions of the 2 fragments.

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232 Th fission fragment angular distribution (FFAD)

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  1. Fission fragment angular distributionsand isotopic distributionsL. Tassan-Gotand n_TOFand SOFIA

  2. 232Th fission fragment angular distribution (FFAD) • Detection of the 2 fission fragments • Fission direction given by the positions of the 2 fragments • 9 Targets and 10 detectors tilted by 45° • 1x235U 1x238U 1x237Np 6x232Th

  3. Examples of angular distributions

  4. Rules of thumb for FFADs

  5. Fissilityeffect LowerfissilityhigherbarrierlowertemperaturelowerK0 lowerK’shigher positive anisotropy

  6. Anisotropy for p+Xat 40 MeV

  7. Systematics of linearmomentumtransfer At 40 MeV almost full momentumtransfer: in most of the cases the proton iscaptured by the target nucleus

  8. SOFIA experiment Fromcourtesy of J. Taieb, T. Corbinet, J. Fiona-Martin, E. Pellereau, A. Chatillon

  9. 238U Z1+Z2=92 selection

  10. Mass resolution

  11. Fission of 238U: mass yield

  12. Fission of 238U: charge yield • Even-oddeffect=10% (<E*>~14 MeV) vs Lohengrin=24% (<E*>=6 MeV) • Even-oddeffectdecreaseswith excitation energy

  13. Fission of 238U: isotopicyields for heavy fragment

  14. Fission of neutron deficientnuclei x K.H. Schmidt et al., Nucl. Phys. A665 (2000) 221

  15. Fission of neutron deficientnuclei

  16. Fission of neutron deficientnuclei

  17. Fission of neutron deficientnuclei

  18. Courtesy of Julie Fiona-Martin Energetics of Sn isotopes for fission of 235U <𝜈>=Nf- N1 - <N2>

  19. Fission of 238U: isotonicyield • Even-oddeffect=5% (<E*>~14 MeV) vs Lohengrin=5% (<E*>=6 MeV) • Evaporation ?

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