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Super-FRS the Next-Generation Facility for Physics with Exotic - - PowerPoint PPT Presentation
Super-FRS the Next-Generation Facility for Physics with Exotic - - PowerPoint PPT Presentation
Super-FRS the Next-Generation Facility for Physics with Exotic Nuclei Hans Geissel Polish-German Meeting, Warsaw, November 24, 2003 Introduction The Superconducting FRagment Separator The Experimental Branches Polish Contributions
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Polish Collaborations in Nuclear Structure Research at GSI
At the UNILAC (SHIP, Online Separator) Theory and experimental groups for super-heavy element research, spectroscopy of fusion products near the proton dripline and gamma spectroscopy (Coulomb excitation). At the SIS18 (FRS, LAND-ALADIN, ESR) From MUSIC to the discovery of 2p radioactivity Mass measurements Halo and skin nuclei Gamma spectroscopy (RISING) At the Super-FRS Low-Energy Branch: Spectroscopy (α, β, γ, p, 2p, ...) Ring Branch: Stored isomeric beams
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Physics with Exotic Nuclei
rp-Process, Novae and X-ray Bursts r-Process and Supernovae Test of the Standard Model CKM-Matrix Parity Violation and Time Reversal in Atoms Superheavy Elements Fundamental Symmetries and Interactions Nuclear Astrophysics Structure & Dynamics
- f Exotic Nuclei
Sp=0 Sn=0
Halo, Skin, Molecule Nuclei New Shells New Shapes New Decay Mode 2 p-Emission Applications
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High Energies RIB → Discovery of the Proton Halo
- W. Schwab et al.,
Z.Phys. A350 (1995) 283
1500 MeV/u
halo nucleon
target halo system
core
nucleus
- H. Lenske,
- Prog. Part. Nucl. Phys. 46 (2001)
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Limitations of the Present Facility
Low primary beam intensity (e.g. 108
238U ions /s)
Low transmission for projectile fission fragments (4-10%) Low transmission for fragments to the experimental areas (cave B,C) and into the storage ring ESR (a few %) Limited maximum magnetic rigidity @ FRS: for U-like fragments @ ESR: cooler performance and magnets @ALADIN, to deflect break-up fragments
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Solutions→ SIS-100/300, Super-FRS, CR, NESR
SIS-100/300 238U ions 1012 / s Large Acceptance Superconducting FRagment Separator (Super-FRS) Ion-optical Parameters: CR, NESR
1500 R Tm 20 Bρ % 2.5 p ∆p mrad 20 φ mrad, 40 φ mrad mm π 40 ε ε
ion max y x y x
= = ± = ± = ± = = =
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Comparison of FRS and Super-FRS
FRS Super-FRS
Degrader Degrader 1 Degrader 2
- H. Geissel et al. NIM B 204 (2003) 71
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The Super-FRS is ideal for Studies of r-Process Nuclei
K.-H. Schmidt
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The International Accelerator Facility for Beams of Ions and Antiprotons
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The Super-FRS and its Branches
see talk by Magda Górska
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The Super-FRS and its Branches
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Reactions with Relativistic Radioactive Beams
Experiments in the High Energy Branch of the Super-FRS
- T. Aumann, H. Emling, B. Jonson
Physics Goals single-particle occupancies, spectral functions, correlations, clusters, resonances beyond the drip lines single-particle occupancies, astrophysical reactions (S factor), soft coherent modes, giant resonance strength, B(E2) Gamov-Teller strength, spin-dipole resonance, neutron skins shell structure, dynamical properties reaction mechanism, applications (waste transmutation, ...) γ-ray spectroscopy, isospin-dependence in multifragmentation Experiments knockout and quasi-free scattering electromagnetic excitation charge-exchange reactions fission spallation fragmentation
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The High Energy Experimental Setup
High-resolution momentum measurement Large-acceptance measurements
Fragments Neutrons Protons Neutrons Exotic beam from Super-FRS γ rays
Bρ = mγ v / Z
- T. Aumann
Reactions with Relativistic Radioactive Beams R3B
A versatile setup for kinematical complete measurements
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The Super-FRS and its Branches
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Predictive Power of Mass Models
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New Isospin Dependence of Pairing
- 2. Pairing-Gap energy, deduced from 5-point binding difference
( )
2 5
) 2 , ( ) 1 , ( 4 ) , ( 6 ) 1 , ( 4 ) 2 , ( 8 1 ) , ( c N Z m N Z m N Z m N Z N Z m N Z
n
⋅ − + − − + + − + = ∆
( )
2 5
) , 2 ( ) , 1 ( 4 ) , ( 6 ) , 1 ( 4 ) , 2 ( 8 1 ) , ( c N Z m N Z m N Z m N Z N Z m N Z
p
⋅ − + − − + + − + = ∆
- Yu. Litvinov
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Lifetime Measurements of Short-lived Nuclei Applying Stochastic and Electronic Cooling
- D. Boutin
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207 81+
Tl
207 81+
Pb
207m 8 1+
Tl
207m 8 1+
Tl
207 81+
Tl
207 81+
Pb
207m 8 1+
Tl
207 81+
Tl
207 81+
Pb
207 81+
Tl
207 81+
Pb
207 81+
Tl
207 81+
Pb
207m 8 1+
Tl
1
026 . 328 .
−
± = s
lab
λ
s T T
lab lab
12 . 48 . 1 2 ln
2 / 1 2 / 1
± = = = λ γ γ
4305 . 1 = γ
Observation of the Short-Lived Isomer 207mTl with Stochastic Cooling
- D. Boutin, F. Nolden
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Advantage and Opportunities
- f eA Experiments
PRL 85 (2000) 2913
- H. Simon, H. Weick
Coincidence with recoils
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International Collaborations at the Super-FRS
NUSTAR, 73 Council Members, 23 Countries Super-FRS: D(JLU), F(GANIL), JPN(Riken), USA(ANL, MSU), Low-Energy Branch: B, D, E, PL, SF, UK, High-Energy Branch: D, E, NL, S, (R3B) Ring Branch: D, JPN, NL, PL, S, USA
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Summary
Studies of exotic atoms and exotic nuclei will contribute significantly to the basic knowledge of matter. Precision experiments with stored exotic nuclei open up a new field for nuclear structure physics and astro- physics. The next–generation facility will present unique conditions for research and education. There are many technical challenges inviting especially also the next-generation scientists.
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Electron Scattering
eA collider Conventional
- Point like particle
- Pure electromagnetic probe
⇒ formfactors F(q)
- F(q) transition formfactors
⇒ high selectivity to certain multipolarities
- Unstable nuclei
- Large recoil velocities
⇒ full identification (Z,A)
- Kinematics
⇒ 4π - geometry, small angles complete kinematics
- Bare ions
⇒ no atomic background
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Layout of the CR Lattice
Lattice designed by A. Dolinskii
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Layout of the NESR Lattice
Tasks In-ring-experiments at
- Gas-jet-target
- Electron target
- Electron ring
Deceleration to energies < 100 MeV/u
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