Production of spin-oriented unstable nuclei via the projectile-fragmentation reaction
Transfer Reactions on Unstable Nuclei for Nuclear Science ... · ProtonProtonEnergy Angular‐Angle...
Transcript of Transfer Reactions on Unstable Nuclei for Nuclear Science ... · ProtonProtonEnergy Angular‐Angle...
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Transfer Reactions on Unstable Nuclei for Nuclear Science Nuclear Science ApplicationsD. W. Bardayan (ORNL), y ( ),
M. S. Smith(ORNL),
J. A. Cizewski(Rutgers),
S. D. Pain(ORNL)
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Motivation
• Fully realize nucleon transfer reactions for diagnosing the physics of high-temperature thermonuclear burning.
Internal Confinement Fusion at NIF showing capsule of doped Be for diagnostics• Provide an empirical foundation for indirect determinations of
neutron fluxes in extreme thermonuclear environments including
– internal confinement fusion capsules, p ,– nuclear devices, – nuclear reactor fuel rods, – and even exploding stars.
• The determination of such fluxes can give invaluable clues to the mechanisms of these extreme events that are so important for the energy independence and security of our Nation.
Reaction network of Y isotopes needed for nuclear device diagnostics
Nation.
• Need to understand structure and reactions on radioactive neutron-rich nuclei.
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Astrophysical reactions
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Project included 3 components to greatly improve ability to study single-nucleon (d,p) reactions in inverse kinematics.inverse kinematics.
(1) A large area barrel array of (2) A fast forward‐angle ionization chamber for(1) A large area barrel array of silicon strip detectors (SuperORRUBA).
(2) A fast forward angle ionization chamber for timing and identification of beam like recoils.
(3) A b b h t d l d (~1 idth) b t HRIBF
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(3) A beam buncher to produce pulsed (~1 ns width) beams at HRIBF.
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Proton Angular DistributionProton Energy‐Angle Systematics
Requirements of Requirements of the Oak Ridge Rutgers University Barrel Array (ORRUBA)the Oak Ridge Rutgers University Barrel Array (ORRUBA)
20
g
25 • High Solid Angular Coverage
132Sn(d,p) @ 4.5 MeV/A
Proton Energy Angle Systematics
15
20
g g g
• Good energy and angular resolution
• Large dynamic range
15
ield
gy (M
eV)
15
10Yi
10
Energ
55
000 60 90 120 150 180
Laboratory Angle (deg)30
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Oak Ridge Rutgers University Oak Ridge Rutgers University
Barrel Array (ORRUBA)Barrel Array (ORRUBA)• ORRUBA gives ~80% coverage over the range 47°→132°
• 2 rings – < 90°: 12 telescopes (1000m R + 65m NR)g
– > 90°: 12 detectors (500m R)
• 324 channels total (288 front side, 36 back side)
• HI beam
• Deuterated plastic targets
(C,C)
(d,p)(d,d)
(p,p)
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ORRUBA Detector DesignORRUBA Detector Design
4 strip resistive8 strip non‐resistive4 strip resistive detectors
8 strip non resistive detectors
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Multiple Disadvantages of Charge DivisionMultiple Disadvantages of Charge Division
Position‐dependent gainsEnergy‐dependent lengthsand high thresholds
C Uncertain energy and position calibrations Must float detectors in space by
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C – Uncertain energy and position calibrations – Must float detectors in space by several millimeters to match observed data kinematics
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SUPER ORRUBASUPER ORRUBA
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First Prototype Tests arrived Fall 2010
30‐keV separated 244Cm lines244Cm lines.
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244Cm source imaged in alpha particles
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Mechanical Design by Surrey GradStudent Stephen Hardy (March 2011)
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Construction April‐May 2011
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900 Channels Fed into single Rack of Electronics
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ASICs (Washingon U. Collaboration)Implemented at ORNL by T. Ahn (U. Tenn.), R. L. Varner(ORNL) and M. Matos (LSU)
Conventional Setup New Setup
Shaping Amplifier + OR Logic Unit Shaping Amplifier + OR Logic Unit + + Gate&DelayGate&Delay Generator(GDG) + Generator(GDG) + ADCs + VME I/FADCs + VME I/F
Shaping Amplifier + OR Logic Unit Shaping Amplifier + OR Logic Unit + + Gate&DelayGate&Delay Generator(GDG) + Generator(GDG) + ADCs + VME I/FADCs + VME I/F
ASICs Array + Motherboard + ASICs Array + Motherboard + XLM + VME I/FXLM + VME I/F
ASICs Array + Motherboard + ASICs Array + Motherboard + XLM + VME I/FXLM + VME I/F
Shaping Amplifier OR Logic UnitASICs + Motherboard
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GDG ADCs + VME I/FECL/Nim Converter
+ Power SupplyXLM + VME I/F
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2H(80Ge,p)81Ge Run – April 2011
C
80Ge
CD
H
CD2
C D
H
Energy
Energy
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ORRUBA SuperORRUBA
Comparison of elastic scattering results
nergy
nergy
EnE
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Position Position
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2H(130Te,p)131Te – July 2011
SuperORRUBA – July 2011 ORRUBA – August 2006p y
Energy
Energy
Position Position
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Project (2) – Fast Ionization Counter
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Fast Ion Counter design based on TEGIC used at RIKEN
K. Kimura et al., Nucl. Instr. and Meth. A538(2005)608
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50 kHz 200 kHz 300 kHz
First Beam Tests done with 10Be/10B beam – July 2010
50 kHz 200 kHz 300 kHz
E 1
10Be10B
pile up
E
10B beam, Ebeam = 60 MeV 10B/10Be cocktail beamE1+E2
Mixed 76Ge/76Se beam at 500 kHz, 310 MeV.March 2011
E 1
Se
Ge
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E1+E2
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Project (3) – Nanosecond Beam Buncher
•Particle identification of detected charged particles can be determined via time of flight.
•(d,p) proton – 1.8 ns•Elastically scattered protons – 5.8 ns•Elastically scattered deuterons – 8 1 ns•Elastically scattered deuterons – 8.1 ns
•Beam bunches ~ 1 ns would provide enough resolution to resolve these groups.
Simulations have been performed with sinusoidal pvarying fields.
Achieved bunches of 0.4 ns width with 53% efficiency at awidth with 53% efficiency at a focal length of 5 m from the buncher for a 132Sn beam.
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Budget
Budgeted (3 years) Spent (1.75 years)
Labor (S D Pain $ 870 K $ 385 KLabor (S. D. Pain, D. W. Bardayan, M. S. Smith)
$ 870 K $ 385 K
Postdocs $ 250 K $ 66 KPostdocs $ 250 K $ 66 K
SuperORRUBA $ 494 K $ 441 K
Ionization Counter $ 80 K $ 47 K
B B h $ 150 K $ 31 KBeam Buncher $ 150 K $ 31 K
Subcontract – Jolie Cizewski
$ 56 K $ 7 K
$ $Total $ 1900 K $ 977 K (51% spent)
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Participants
• D. W. Bardayan, K. Y. Chae, B. H. Moazen, S. D. Pain, M. S. Smith (ORNL)• J. C. Blackmon, L. Linhardt, M. Matos (LSU)• A. Ayres, T. Ahn, K. Schmitt (U. Tenn.)• J. A. Cizewski, S. Strauss (Rutgers)J. A. Cizewski, S. Strauss (Rutgers)• S. Hardy (U. Surrey)
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