Status of the fission setup at ELISe
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Status of the fission setup at ELISe. Aleksandra Keli ć for [email protected] 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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Status of the fission setup at ELISe

Aleksandra Kelić

for [email protected] collaboration

CEA DAM – GSI Darmstadt – CEA DEN

IPNL – IPNO – CENBG – Univ. Santiago de Compostela


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

    • ...


  • (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


    Fission barriers - Experimental information

    Relative uncertainty: >10-2

    Available data on fission barriers, Z ≥ 80 (RIPL-2 library)


    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)


    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


    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


    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


    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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