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Exploring Uncharted Nuclear Regions via Deep-Inelastic Reactions

Discover new regions of the nuclear chart with deep-inelastic reactions at ATLAS Users Meeting. Topics include nuclear shell structure, r-process, and neutron-rich nuclei production. Learn about advanced collection and measurement techniques.

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Exploring Uncharted Nuclear Regions via Deep-Inelastic Reactions

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  1. N=126 factory Guy Savard Scientific Director of ATLAS Argonne National Laboratory & University of Chicago ATLAS Users Meeting ANL, May 15-16, 2014

  2. Accessing new regions: deep-inelastic reactions to reach the far north-east of the nuclear chart 238U 208Pb The Science: • nuclear shell structure at the extremes • r-process: second abundance peak, fission recycling and termination • fission barriers of neutron-rich nuclei and symmetry energy • connection of hot-fusion SHE island and mainland • Unusual GT vs 1st forbidden beta decay ratios ATLAS Users Meeting Guy Savard, Argonne National Laboratory May 15-16, 2014 2

  3. 238U 1 GeV/u 238U + 1H Armbruster et al. • difficult to reach via fragmentation • cannot be reached via fusion • unique physics, critical to the r-process, which is wide open for a facility able to reach there, even in the FRIB era ATLAS Users Meeting Guy Savard, Argonne National Laboratory May 15-16, 2014 3

  4. Producing neutron-rich N=126 nuclei Production using deep-inelastic reaction: e.g.: 136Xe at 9 MeV/u and 5 pmA on a 10 mg/cm2198Pt rotating target All of these isotopes, except for 204Pt, are unknown … no mass, lifetime or decay properties known Extracted beam: ~ 15% of production Calculated using GRAZING (http://personalpages.to.infn.it/~nanni/grazing) ATLAS Users Meeting Guy Savard, Argonne National Laboratory May 15-16, 2014 4

  5. Collecting the N=126 recoils Deep inelastic reactions used in the past to produced n-rich isotopes, the products identified in complex setups (Mayer 1985, Corradi 1999, …), but no system has so far been able to collect them efficiently. But the cross-section are high and with high primary beam intensity and efficient collection efficiency sizable yield in unexplored n-rich regions are reachable Proposed collection system capitalizes on High primary beam intensity High -intensity gas catcher technology Feed low-energy systems: mass measurements, decay spectroscopy, … target-like recoils beam dump extracted recoils to selection stage 136Xe rotating 198Pt target ATLAS Users Meeting Guy Savard, Argonne National Laboratory May 15-16, 2014 5

  6. The CPT-II apparatus and low-energy stations for deep-inelastic reaction products Decay Station • Designed to push back space charge limit • RFQ ion guide now operating in DC mode to avoid space charge build up • Rough mass separation by in-flight mass separator before isobar separator • Rest of system essentially the same • Can operate at up to 5-50 pmA while still providing required selection before precision Penning trap • Deep inelastic reactions down to ~0.01 mb … around 198Hf on N=126 line Mass separator (DM/M ~ 1/1000) G. Savard May 3-5 2010 ATLAS Operation’s Review

  7. Status • Main components are being constructed • Production system will be installed in experimental area III in early 2015 • CPT moved to this area later in 2015 to start mass measurement program in this region • Low-energy beamline to deliver these beams to various experiments to be stationed temporarily in area III to follow ATLAS Users Meeting Guy Savard, Argonne National Laboratory May 15-16, 2014

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