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Status of the fission setup at ELISe

Status of the fission setup at ELISe. Aleksandra Keli ć for Fission@ELISe collaboration. CEA DAM – GSI Darmstadt – CEA DEN IPNL – IPNO – CENBG – Univ. Santiago de Compostela. Why studying fission?. - Applications Astrophysics (r-process nucleosynthesis)

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Status of the fission setup at ELISe

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  1. Status of the fission setup at ELISe Aleksandra Kelić for Fission@ELISe collaboration CEA DAM – GSI Darmstadt – CEA DEN IPNL – IPNO – CENBG – Univ. Santiago de Compostela

  2. Why studying fission? • - Applications • Astrophysics (r-process nucleosynthesis) • Energy production in nuclear power plants • RIB production • Spallation sources • ... • - Basic research • Dissipation in a superfluid Fermionic system • Nuclear structure effects at large deformations • Viscosity of nuclear matter • ...

  3. (Some) Experimental difficulties • - Restricted choice of systems • Available targets  stable or long-lived nuclei • Reaction products  limited N/Z range in heavy-ion fusion • - Physical limits on resolution • Z and A resolution difficult at low energies • Scattering in target/detector at low energies (tails in A/TKE • distribution) • - Technical limits on correlations • No experimental information available on AandZ of both fission • fragments simultaneously

  4. Fission barriers - Experimental information Relative uncertainty: >10-2 Available data on fission barriers, Z ≥ 80 (RIPL-2 library)

  5. Neutron-induced fission rates for U isotopes Panov et al., NPA 747 (2005) Fission barriers Limited experimental information on the height of the fission barrier Kelić and Schmidt, PLB 643 (2006)

  6. What do wee need? New experimental setup dedicated to studying fission • Fission fragment yields (Z1, A1, Z2, A2) • Branching ratio (Gf/Gtot) • Particle production - As a function of the excitation energy  ELISe and R3B setups

  7. Fission at ELISe Super FRS : Chosen secondary beam: 232-238Np 230-238U 228-237Pa 225-235Th 223-230Ac Advantages: Precise determination of the excitation energy by measuring the energy of the scattered electrons No energy and angle straggling in the target No contribution from nuclear induced reactions

  8. Fission setup at ELISe n& En u1& u2 Z1& Z2 (Br)1 & (Br)2  A1 & A2 Difficulty:the central trajectory must be free from material

  9. Status 1.Position detectors: MWPC (IPN Orsay) Dx (FWHM) = 0.5 mm, Dy(FWHM) = 2 mm 2. Time of flight detectors: Stripped scintillator (CEA/DAM) Dt (FWHM) = 50 ps 3. Ionisation chamber: Multisampling IC (GSI) DZ (FWHM) = 0.4 4. Neutron wall: Based on the LAND design (CEA/DAM)

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