Rare Isotope Accelerator Facilities of North America. 18 th Winter Workshop on Nuclear Dynamics Nassau, Bahamas January 23, 2002. J. Nolen, ANL. Three regimes of nuclear physics. The Limits of Nuclear Stability. Heavy Elements. Fission Limit?. Known Nuclei. Proton Drip Line.
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18th Winter Workshop on Nuclear Dynamics
January 23, 2002
J. Nolen, ANL
Neutron Drip Line?
A1900 fragment separator
l=2 4411 mb
Theo. 53 mb
l=0 167 mb
Theo. 12 mb
V. Maddalena et al., Phys. Rev. C 63 (2001) 024613
9Be(12Be,11Be*) at 78 MeV/u with γ-ray coincidences.
Navin et al. accepted PRL 2000
Experiments can be performed with as low as 0.1 ions/s with beam energies of 50-150 MeV/u
Standard Model of
September, 2001 ATLAS
Reaction: 12C(7Li, 6He)13N
7Li beam @ 20 pnA,
6He atoms extracted at 3 ´ 105 /s
Lu, Rehm, et al.,
requires a precision
beam for implantation
in a thin Si detetector
400 kW beam power
M. Harrison, Chair, et al. : Report to NSAC Jan. 2001
N / Z
J. Dobaczewski and W. Nazarewicz
Phil. Trans. R. Soc. Lond. A 356, 2007 (1998)
RIA .01/s limit
Sn = 100 keV
HF-Skyrme interaction tuned for ground state properties
B.A. Brown, Phys. Rev. C 58 (1998) 220
New tools offer new opportunities and clever experimenters will take advantage of them.
·High power CW SC Linac Driver (1.4 GV, 400 kW)
Advdanced ECR Ion Source
Accelerate 2 charge states of U from ECR
All beams: protons-uranium
Superconducting over extended velocity range: 0.2 – 900 MeV/u
Multiple-charge-state acceleration after strippers
Adapted design to use both SNS cryomodules
RF switching to multiple targets
·Large acceptance fragment separators
1) “Range Bunching” + Fast gas catcher for ISOL
2) High resolution and high purity for in-flight
·High power density ISOL and fragmentation targets
Liquid lithium as target for fragmentation and cooling for n-generator
·Efficient post-acceleration from 1+ ion sources
·Next-generation instrumentation for research with rare isotopes
Uranium Acceleration Scheme
10 MeV/u85 MeV/u 400 MeV/u
Calculated multiple charge state acceleration in the high E section:
q = 69-73
q = 87-90
Calculated multiple charge state injection:
Two independent radioactive beam and one stable beam experiment can be run concurrently.
Santa Fe, March 26-30, 2001
Recommendation:The Rare Isotope Accelerator (RIA) is our highest priority for major new construction. RIA will be the world-leading facility for research in nuclear structure and nuclear astrophysics.
R&D: Seven labs in the U.S. are participating in R&D for the RIA project. MSU & ANL are working together to develop a cost-effective technical plan. Both institutions would like to be the site of RIA.
Optimistic time line for RIA
DOE Critical Decision 0 in 2002, followed by 3 years of design and 4 years of construction. Operation in 2010.