a university-based cyclotron laboratory for nuclear science
DESCRIPTION
A University-based cyclotron laboratory for nuclear science. Maxime Brodeur. Importance of low-E NP research . Goal : understand the atomic nucleus. Three main topics of studies in the low-energy domain:. Fundamental symmetries Nuclear astrophysics Nuclear structure. - PowerPoint PPT PresentationTRANSCRIPT
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I N S T I T U T E F O R S T R U C T U R E A N D N U C L E A R A S T R O P H Y S I C S
N U C L E A R S C I E N C E L A B O R A T O R Y
A University-based cyclotron laboratory for nuclear science
Maxime Brodeur
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I N S T I T U T E F O R S T R U C T U R E A N D N U C L E A R A S T R O P H Y S I C S
N U C L E A R S C I E N C E L A B O R A T O R YImportance of low-E NP research
ARUNA workshop – June 13, 2014
Goal: understand the atomic nucleus
• Fundamental symmetries• Nuclear astrophysics• Nuclear structure
By providing stable ion beams and some RIBs, ARUNA currently contributes in all subfields.
Three main topics of studies in the low-energy domain:
These beams are however of limited reach
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N U C L E A R S C I E N C E L A B O R A T O R YThe problem
ARUNA workshop – June 13, 2014
• CARIBU/ATLAS at ANL• NSCL
Main options to perform experiments with exotic beams in the USA:
Highly competitive large user facilities
• Beam request largely exceed available time
Proposed
Accepted
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N U C L E A R S C I E N C E L A B O R A T O R YSide-effects
Result: reduced experimental time
ARUNA workshop – June 13, 2014
• Experiments requiring time cannot be performed• Few measurements can be done yearly
The 2013 low-energy community meeting statement:
“The community is concerned about the lack of beam time at existing facility and its impact on the workforce development”
Propose to locally produce RIBs to address this need
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I N S T I T U T E F O R S T R U C T U R E A N D N U C L E A R A S T R O P H Y S I C S
N U C L E A R S C I E N C E L A B O R A T O R Y
Local RIB production• p-induced fission• p from 24 MeV commercial cyclotron• Ip ~ 500mA• H- machine; 2 simultaneous beams
ARUNA workshop – June 13, 2014
1.1 barn at 24 MeV
TR24 from ACSI
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N U C L E A R S C I E N C E L A B O R A T O R YPartnership
• Shared use of cyclotron with private partner• Production of medical radioisotopes (99mTc, …)
ARUNA workshop – June 13, 2014
• The cyclotron and building will be financed by Notre Dame and the medical isotope company.
• Operation of the cyclotron and operational costs (e.g. utilities) provided by the company
CyclotronNotre Dame Isotope
production
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I N S T I T U T E F O R S T R U C T U R E A N D N U C L E A R A S T R O P H Y S I C S
N U C L E A R S C I E N C E L A B O R A T O R YPartnership
• Day-time use for research (simultaneous also possible)• Lots of beam availability for nuclear experiments
ARUNA workshop – June 13, 2014
CyclotronNotre Dame Isotope
production
• Place where long-term and more challenging measurements can be done…
• … while measurements on exceptionally exotic nuclei would be done at FRIB
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N U C L E A R S C I E N C E L A B O R A T O R Y
Long-term, challenging measurements• m and Pn of exotic, relevant r-process nuclei
ARUNA workshop – June 13, 2014
Produced at low yield (<1 ion/h), requires long time (weeks) to perform the measurement
• abn of mirror transition to test the electroweak interaction
Challenging measurement requiring large statistics of long half-lived nuclei (t1/2 reaching 20 min.)
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N U C L E A R S C I E N C E L A B O R A T O R YRIB production method• IG-ISOL method• Universal • Well-established• Versatile
ARUNA workshop – June 13, 2014
• Fission (n-rich, r-process)• Fusion-evaporation (p-rich,
mirror transitions)
Can change targets for optimal production
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N U C L E A R S C I E N C E L A B O R A T O R YCalculated deliverable yields
ARUNA workshop – June 13, 2014
238U(p,f)
Ep = 30 MeV
Ip = 10 mA
• Comparable to CARIBU with 1 Ci 252Cf source
• Different yield distribution (complementary)
Figure from J. Aysto
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N U C L E A R S C I E N C E L A B O R A T O R YRIB separation
ARUNA workshop – June 13, 2014
24 MeV pfrom cyclotron
Fission product
24 MeV pfrom cyclotron
• Non-isobaric contamination removed by dipole magnet
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N U C L E A R S C I E N C E L A B O R A T O R YIsobaric purification
ARUNA workshop – June 13, 2014
24 MeV pfrom cyclotron
RFQ cooler and buncher
MR-TOF mass separator or spectrometer
• Isobaric contamination removed by a multi-reflection time-of-flight separator
• Can also be used for mass measurements
Bunches from RFQ
Pure bunches to Paul trap
Recall Yuan Mei’s talk
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N U C L E A R S C I E N C E L A B O R A T O R YExperimental possibilities
• b-delayed n-emission BR • abn of mirror transitions
ARUNA workshop – June 13, 2014
Ion trap measurements:
Co
24 MeV pfrom cyclotron
RFQ cooler and buncher
MR-TOF mass separator or spectrometer
Paul trap for Pn measurements
Could also measure t1/2, …open to suggestions
Or experiments with the protons themselves; e.g. STAR
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N U C L E A R S C I E N C E L A B O R A T O R Y
ARUNA workshop – June 13, 2014
70 Pn that CARIBU cannot produce
Which Pn can be done?
Total of 160 Pn
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N U C L E A R S C I E N C E L A B O R A T O R YApplied physics research opportunities
ARUNA workshop – June 13, 2014
• Some measurements also have applied physics interests
e.g. Pn values are important for:
• The design of next generation nuclear reactors
• Stockpile stewardship
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N U C L E A R S C I E N C E L A B O R A T O R YApplied physics research opportunities
• Medical radioisotopes research
ARUNA workshop – June 13, 2014
e.g. Alternate means to produce 99mTc
• Used in 80% of nucl. med. procedures• Generated from 99Mo decay, which is
produced by fission in reactors• In 2016: 2 reactors responsible to 2/3
world supply set to close
• Alternative: 100Mo(p,2n) reaction using cyclotrons• Issue: purity of 99mTc produced• Contamination production s calculation done at UND (Couder)• s measurements are underway (Couder)
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N U C L E A R S C I E N C E L A B O R A T O R YConclusion
• The new RIB facility will help the nuclear physics community with beam time shortage.
• This unique American IG-ISOL facility would provide a training opportunity in tomorrow’s scientific workforce
ARUNA workshop – June 13, 2014
• The cyclotron facility will allow various funding opportunities
• Like other ARUNA facilities, the unfair advantage of this facility over large user facilities is time.
• Allows to make long-term measurements that cannot be done at large facilities
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N U C L E A R S C I E N C E L A B O R A T O R Y
Backup slides
ARUNA workshop – June 13, 2014
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N U C L E A R S C I E N C E L A B O R A T O R Y
RIB cooling and bunching
ARUNA workshop – June 13, 2014
24 MeV pfrom cyclotron
RFQ cooler and buncher
Continuous beam
Cooled bunches
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N U C L E A R S C I E N C E L A B O R A T O R YPn measurements
ARUNA workshop – June 13, 2014
24 MeV pfrom cyclotron
RFQ cooler and buncher
MR-TOF mass separator or spectrometer
Paul trap for Pn measurements