ATLAS Research projects (DOE milestone NS8)

1
ATLAS Research projects(DOE milestone NS8)

• W. Loveland
• Oregon State University

2
Heavy element survival probabilities
3
?n/?f Direct Neutron Counting

• Use technique of cross bombardments
• 26Mg 248Cm ?274Hs (E49)?273Hs(E39.5)?
• 25Mg 248Cm ?273Hs (E39.5)?
• Measure ?pre and ((?n)/(?tot)) for first chance
  fission using the Harding-Farley method.

4
Study of deep inelastic collisions using very
n-rich projectiles

• Systems to study
• 5A MeV 94Rb 92Mo
• 5A MeV 94Rb 58Ni
• Physics
• Is the process responsible for N/Z equilibration
  a collective mode of high frequency or a
  stochastic random walk relaxation?
• (The exchange model would predict a weak
  dependence of the width of the fragment charge
  distributions upon the disequilibrium involved in
  the initial N/Z ratio while the collective model
  would predict a strong correlation between the
  average final width of the projectile charge
  distribution as a function of the initial charge
  dis-equilibration.)
• Advantages of RIBs
• . The use of such beams extends the range of N/Z
  ratios available for study, and reduces the
  probability of charged particle emission in the
  collisions

5
Atomic Properties of the heaviest elements

• Experiment
• Form a beam of charged EVR recoils
• Neutralize the recoils to form a neutral beam
• Pass neutral beam through an inhomogenous
  magnetic field.
• Detect neutral atoms and their deflection by
  decay
• Physics
• Direct measurement of atomic properties