Download PRESPEC – towards gamma-ray spectroscopy of exotic nuclei at FAIR

Overview
PRESPEC – towards gamma‐ray spectroscopy of exotic nuclei at FAIR
• Towards FAIR and the NuSTAR project
• The RISING campaigns at GSI: fast and decay
• The next stage: PRESPEC...
(a) Timelines and plans
(b) Proposed programme
AGATA at GSI
(c)
5/7/2009
FIDIPRO‐EFES ‐ Bentley
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FAIR: A European Fragmentation Facility 5/7/2009
FIDIPRO‐EFES ‐ Bentley
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Super FRS – At the Heart of the NuSTAR project...
Low-Energy Branch
Super-FRS
Primary target
to rings
Low-Energy Branch: Gamma-ray
spectroscopy with exotic fragments...
• HISPEC - High Resolution in-beam
Spectroscopy
• DESPEC - Decay Spectroscopy
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NuSTAR @ FAIR
NUclear STructure Astrophysics and Reactions
What are the limits for existence of nuclei?
Where are the proton and neutron drip lines situated? Where does the nuclear chart end?
How does the nuclear force depend on varying proton‐to‐neutron ratios?
What is the isospin dependence of the spin‐orbit force?
How does shell structure change far away from stability?
How to explain collective phenomena from individual motion?
What are the phases, relevant degrees of freedom, and symmetries
of the nuclear many‐body system?
How are complex nuclei built from their basic constituents?
What is the effective nucleon‐nucleon interaction?
How does QCD constrain its parameters?
Which are the nuclei relevant for astrophysical processes and what are their properties?
What is the origin of the heavy elements?
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RISING @ GSI...
History...
1998
2000
2002
2004
2006
2008
RISING
Stopped campaign
RISING
Fast campaign
VEGA
Isomer campaign
g-RISING
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Fast‐Beam RISING @ GSI...
Fragment Identification, Reaction and Spectroscopy
production
selection
spectroscopy
identification
reaction
identification
 detectors
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Calorimeter
Fast‐Beam RISING @ GSI...
Relativistic Coulomb excitation / fragmentation
112Sn
Coulomb
interaction
Prefragment
5/7/2009
→Au
excited
nucleus
Equilibrated
nucleus
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Fast‐Beam RISING @ GSI...
5/7/2009
105 Ge crystals
Energy resolution (FWHM): 1.24%
Total efficiency: 2.9%
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[for E = 1.3 MeV at 100 MeV/u]
Fast‐Beam RISING @ GSI...
Doppler shift
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FIDIPRO‐EFES ‐ Bentley
Doppler broadening
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Fast‐Beam RISING @ GSI...
RISING: Fast beam ‐ physics focus
Coulex in triaxial
nuclei 136Nd
Coulex in nuclei towards
100Sn
Spectroscopy of mirror nuclei
(A~50) via two-step
fragmentation
Pigmy resonance
in n-rich nuclei
Spectroscopy of 36Ca
via two-step fragmentation
5/7/2009
Coulex in n-rich Cr isotopes
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Convener: P. Reiter, University of Cologne
Fast‐Beam RISING example: B(E2) in 134Ce and 136Nd
750 MeV/u 152Sm
fragmented on
4g/cm2 Be target
Asymmetric Rotor model
‐rigid
‐soft
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Stopped‐Beam RISING @ GSI...
Fragment Identification, Implantation and Spectroscopy
production
selection
identification
implantation
spectroscopy
 detectors
5/7/2009
Catcher
FIDIPRO‐EFES ‐ Bentley
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Stopped‐Beam RISING @ GSI...
5/7/2009
105 Ge crystals, 3 rings
Energy resolution (FWHM): 0.2%
Total efficiency: ≈15 % [at E = 1.3 MeV]
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digital signal processing, time stamped data
RISING: Stopped beam - physics focus
T1/2 = 10.4 s
g-factors of light Pb
isotopes
High spin
population in rare
earth nuclei
Structure south of
208Pb
Structure of N126
+/EC decay of
100Sn
Shape coexistance in 190W
Structure
around N=Z
Collectivity of n-rich Ta, W
np pairing
82Nb 86Tc
g-factors below 132Sn
np pairing
62Ge 62Ga
5/7/2009
Spin population
mechansim
Isospin symmetry
of Tz=-1 nuclei
42Ti ... 54Ni
Structure
FIDIPRO‐EFES ‐ Bentley
around 110Zr
shell quenching in 130Cd
r process abundances
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54Ni spectroscopy at RISING
D.Rudolph et al, Phys. Rev. C78 (Rap. Comm) (2008) 021301
Delayed Gamma‐rays after implantation
550 MeV/u 58Ni fragmented on 1g/cm2 Be target
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54Ni spectroscopy at RISING
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PRL 97 (2006) 152501
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D.Rudolph et al, Phys. Rev. C78 (Rap. Comm.) 2008 021301
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The J=2 Anomaly
D.Rudolph et al, Phys. Rev. C78 (2008) 021301(R)
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Towards NuSTAR (@ GSI)
Physics with Fragmentation Beams
Present
2014
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Towards HISPEC/DESPEC– Instrumentation development AIDA
TDR submitted
LYCCA
TDR accepted,
production starts
4 Neutron Array
development on-going
AGATA
TDR ready,
Demonstrator being
assembled,
5/7/2009
First exp. at LNL in 2009
Plunger
Device operational,
adaptation ongoing
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PRESPEC Phase 1 – 2010‐2012
Fast Beam Campaign First –
IMPROVEMENTS...
production
primary
intensity
selection
identification
rate capability
spectroscopy
 tracking
reaction
granularity /
active target
identification
ToF
 detectors
5/7/2009
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Calorimeter
LYCCA‐0 – Fragment identication and tracking
5/7/2009
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AGATA – The ultimate gamma‐ray detector...
AGATA-demonstrator
Simulations of AGATA at PRESPEC
Possible
(probable) operation of 8-10 triple clusters
C. Domingo‐Pardo, GSI
in 2011-12 at GSI
AGATA increases
-sensitivity by FACTOR of
~10 over Rising
Provides -ray tracking capability for PRESPEC
5/7/2009
FIDIPRO‐EFES ‐ Bentley
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RISING to PRESPEC to NuSTAR@FAIR
Time‐Line
2009
2010
2011
2012
2013
2014
Super-FRS Commis. at FAIR
2008
RISING Decay
active stopper
PRESPEC
LYCCA-0 Commis.
PRESPEC In
beam
AGATA Demon.
PRESPEC
Decay
neutrons,
g-factor,...
FIDIPRO‐EFES ‐ Bentley
5/7/2009
HISPEC/DESPEC instrumentation commissioning
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PRESPEC Phase 1 – 2010‐2012
History:
Oct.2008:
Workshop in Daresbury defines physics scope and set-up
Jan .2009:
16 proposals submitted to G-PAC
Mar. 2009
GSI management provisionally agrees to host AGATA in
2011/12 (resources and beam time planning starts)
Time plan:
June 2009:
experiments
Some proposals selected as possible Pre-AGATA
Oct.2009:
Proposals resubmitted to G-PAC
2010:
Perform PRESPEC up-front experiments without AGATA
Physics workshop – open call for proposals
Proposal submission and G-PAC evaluation
2011/12:
Installation and operation of PRESPEC/AGATA
5/7/2009
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8 Clusters
Hole (11.5 cm) beam-pipe 11 cm
E,o = 1 MeV
Emission source @  = 0.50
AGATA@GSI
Efficiency = 10 %
Resolution = 7 keV (FWHM)
RISING
Efficiency = 3 %
Resolution = 20 keV (FWHM)
About one order of magnitude improvement in sensitivity!
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