Maxime Brodeur Importance of lowE 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 ID: 254634
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Slide1
A University-based cyclotron laboratory for nuclear science
Maxime BrodeurSlide2
Importance of low-E NP research
ARUNA workshop – June 13, 2014
Goal
: understand the
atomic
nucleus
Fundamental symmetriesNuclear astrophysicsNuclear 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 reachSlide3
The 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
AcceptedSlide4
Side-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 needSlide5
Local RIB production
p-induced
fission
p
from 24 MeV commercial cyclotronI
p ~ 500mAH- machine; 2 simultaneous beamsARUNA workshop – June 13, 2014
1.1 barn at 24 MeV
TR24 from ACSISlide6
Partnership
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
Cyclotron
Notre Dame
Isotope productionSlide7
Partnership
Day-time use for research (simultaneous also possible)
Lots of beam availability for nuclear experiments
ARUNA workshop – June 13, 2014
Cyclotron
Notre Dame
Isotope production
Place
where long-term and more challenging measurements can be
done…
… while
measurements on exceptionally exotic nuclei would be done at FRIBSlide8
Long-term, challenging measurements
m and
P
n
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
a
bn
of mirror transition to test the electroweak interaction
Challenging measurement requiring large statistics of
long
half-lived nuclei (t
1/2
reaching 20 min.)Slide9
RIB 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 productionSlide10
Calculated deliverable yields
ARUNA workshop – June 13, 2014
238
U(
p,f
)
E
p
= 30 MeV
I
p
= 10
m
A
Comparable to CARIBU with 1
Ci
252
Cf
source
Different yield distribution (complementary)
Figure from J.
AystoSlide11
RIB separation
ARUNA workshop – June 13, 2014
24 MeV p
f
rom cyclotron
Fission product
24 MeV p
from cyclotron
Non-isobaric contamination removed by dipole magnetSlide12
Isobaric
purification
ARUNA workshop – June 13, 2014
24 MeV p
f
rom cyclotron
RFQ cooler and
buncher
MR-TOF mass separator or spectrometer
I
sobaric 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 talkSlide13
Experimental possibilities
b
-delayed n-emission BR
a
bn
of mirror transitions ARUNA workshop – June 13, 2014
Ion trap measurements:
Co
24 MeV p
f
rom cyclotron
RFQ cooler and
buncher
MR-TOF mass separator or spectrometer
Paul trap for
P
n
measurements
Could also measure t
1/2
, …
open to suggestions
Or experiments with the protons themselves; e.g. STARSlide14
ARUNA workshop – June 13, 2014
70
P
n
that CARIBU cannot produce
Which P
n can be done?
Total of 160 PnSlide15
Applied physics research opportunities
ARUNA workshop – June 13, 2014
Some measurements also have applied physics interests
e
.g.
P
n
values are important for:
The design
of
next generation nuclear
reactors
Stockpile
stewardshipSlide16
Applied physics research opportunities
Medical radioisotopes research
ARUNA workshop – June 13, 2014
e
.g. Alternate means to produce
99m
Tc
Used in 80% of
nucl
. med. procedures
Generated from
99
Mo decay, which is produced by fission in reactors
In 2016: 2 reactors responsible to 2/3 world supply set to close
Alternative:
100
Mo(p,2n) reaction using
cyclotrons
Issue: purity of
99m
Tc produced
Contamination production
s
calculation done at UND (
Couder
)
s
measurements are underway (Couder)Slide17
Conclusion
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 facilitiesSlide18
Backup slidesARUNA workshop – June 13, 2014Slide19
RIB cooling and bunching
ARUNA workshop – June 13, 2014
24 MeV p
f
rom cyclotron
RFQ cooler and
buncher
Continuous beam
Cooled bunchesSlide20
Pn measurements
ARUNA workshop – June 13, 2014
24 MeV p
f
rom cyclotron
RFQ cooler and
buncher
MR-TOF mass separator or spectrometer
Paul trap for
P
n
measurements