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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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slide1
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
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
(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
Fission barriers - Experimental information

Relative uncertainty: >10-2

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

fission barriers
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
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
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
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
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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