Maxime Brodeur

Report
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
A University-based cyclotron
laboratory for nuclear science
Maxime Brodeur
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
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
By providing stable ion beams and some RIBs, ARUNA
currently contributes in all subfields.
These beams are however of limited reach
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
The problem
Main options to perform experiments with exotic beams in the USA:
• CARIBU/ATLAS at ANL
• NSCL
Highly competitive
large user facilities
• Beam request largely exceed available time
Proposed
Accepted
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Side-effects
Result: reduced experimental time
• 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
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Local RIB production
•
•
•
•
p-induced fission
p from 24 MeV commercial cyclotron
Ip ~ 500mA
H- machine; 2 simultaneous beams
TR24 from ACSI
1.1 barn at
24 MeV
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Partnership
• Shared use of cyclotron with private partner
• Production of medical radioisotopes (99mTc, …)
Notre Dame
Cyclotron
Isotope
production
• 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
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Partnership
• Day-time use for research (simultaneous also possible)
• Lots of beam availability for nuclear experiments
Notre Dame
Cyclotron
Isotope
production
• Place where long-term and more challenging
measurements can be done…
• … while measurements on exceptionally exotic nuclei
would be done at FRIB
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Long-term, challenging measurements
• m and Pn of exotic, relevant r-process nuclei
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.)
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
RIB production method
•
•
•
•
IG-ISOL method
Universal
Well-established
Versatile
Can change targets for
optimal production
• Fission (n-rich, r-process)
• Fusion-evaporation (p-rich,
mirror transitions)
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Calculated deliverable yields
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
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
RIB separation
24 MeV p
from cyclotron
Fission
product
24 MeV p
from cyclotron
• Non-isobaric contamination removed by dipole magnet
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
24 MeV p
from cyclotron
Isobaric purification
RFQ cooler
and buncher
MR-TOF mass
separator or
spectrometer
• Isobaric contamination removed
by a multi-reflection time-offlight separator
• Can also be used for mass
measurements
Pure bunches
to Paul trap
Bunches
from RFQ
Recall Yuan Mei’s talk
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Experimental possibilities
24 MeV p
from cyclotron
Ion trap measurements:
RFQ cooler
and buncher
MR-TOF mass
separator or
spectrometer
Paul trap for Pn
measurements
• b-delayed n-emission BR
• abn of mirror transitions
Could also measure t1/2, …
open to suggestions
Or experiments with the
protons themselves; e.g.
STAR
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Which Pn can be done?
Total of 160 Pn
70 Pn that CARIBU
cannot produce
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Applied physics research opportunities
• Some measurements also have applied physics interests
e.g. Pn values are important for:
• The design of next generation
nuclear reactors
• Stockpile stewardship
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Applied physics research opportunities
• Medical radioisotopes research
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)
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Conclusion
• The cyclotron facility will allow various funding opportunities
• 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
• 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
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Backup slides
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
RIB cooling and bunching
24 MeV p
from cyclotron
RFQ cooler
and buncher
Cooled
bunches
Continuous
beam
ARUNA workshop – June 13, 2014
I NSTITUTE FOR S TRUCTURE AND N UCLEAR A STROPHYSICS
N UCLEAR S CIENCE LABORATORY
Pn measurements
MCP
trap
electrode
136Xe
RFQ cooler
and buncher
β-
137I
n
MCP
MR-TOF mass
separator or
spectrometer
Paul trap for Pn
measurements
ARUNA workshop – June 13, 2014
Plastic
137Xe
Plastic
24 MeV p
from cyclotron
ν

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