jennifer fallis - erawast workshop ii - 2011 using beams of reclaimed 44 ti to explore the mechanism...
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Jennifer Fallis - ERAWAST Workshop II - 2011
Using beams of reclaimed 44Ti to explore the mechanism of core
collapse insupernovae
Jennifer Fallis
TRIUMF
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Jennifer Fallis - ERAWAST Workshop II - 2011
QuickTime™ and a decompressor
are needed to see this picture.
Road map
• 44Ti production in supernovae & importance of 44Ti(,p)47V
• Creating beams of 44Ti at TRIUMF
• Planned and other possible measurements:– 44Ti(,p) @ TUDA– 44Ti(,) @ DRAGON– 44Ti(p,) @ DRAGON(& EMMA?)
• Other TRIUMF interests
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Jennifer Fallis - ERAWAST Workshop II - 2011
• Supernovae explosions are incredibly complex and most observables are very general, resulting from the overall features of the explosion.
– Light curves - include all energy given off as photons. – Spectroscopy provides elemental abundances, but
only measures the total number of all isotopes of any given element.
– Observations of individual isotopes are particularly useful for comparing models to observations
• presolar grains -ray telescope observations
• Accurate models, however, need precise reaction rates to be sufficiently constrained.
Supernova observables
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Jennifer Fallis - ERAWAST Workshop II - 2011
44Ti production
In neutrino driven explosions:44Ti is synthesized in the -rich freeze out that occurs in
the shock-heated Si layer that lies just above the detonating core and so the amount ejected sensitively depends on location of the ‘mass cut’
– Material that ‘falls back’ is not available for detection
– 44Ti yield a sensitive diagnostic of the explosion mechanism
– Thus, VERY useful for models to make comparisons against
Timmes et al. (1996)
And p-rich freeze outMagkotsios et al. ApJ suppl, 191 (2010)
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Jennifer Fallis - ERAWAST Workshop II - 2011
Most important reactions determined from sensitivity
studiesMagkotsios et al.
(2010):The et al. (1998)
44Ti(,p)47V40Ca(,)44Ti45V(p,)46Cr
40Ca(,p)43Sc17F(,p)20Ne
21Na(,p)24Mg41Sc(p,)44Ti44Ti(p,)45V
57Ni(p,)58Cu43Sc(p,)44Ti
44Ti(,p)47V45V(p,)46Cr
40Ca(,)44Ti57Co(p,n)57Ni36Ar(,p)39K44Ti(,)48Cr12C(,)16O
57Ni(p,)58Cu58Cu(p,)59Zn36Ar(,)40Ca
44Ti(p,)45V57Co(p,)58Ni57Ni(n,)58Cu54Fe(,n)57Ni40Ca(,p)43Sc
Measured at TRIUMF with DRAGON
Letter of intentsubmitted, but this isa challenging beamto produce
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Jennifer Fallis - ERAWAST Workshop II - 2011
Experimental data for 44Ti(,p)
– 4 data points– Energies higher than
those required to study the reaction at astrophysically relevant temperatures
Only measurements are by Sonzogni et al. [PRL 84 (2000)] :
Upper limit of Gamow window at 3 GK
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Jennifer Fallis - ERAWAST Workshop II - 2011
Experimental data for 44Ti(,p)
– 4 data points– Energies higher than
those required to study the reaction at astrophysically relevant temperatures
– Found a rate 2x higher than the SMOKER rates.
Only measurements are by Sonzogni et al. [PRL 84 (2000)] :
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Jennifer Fallis - ERAWAST Workshop II - 2011
Experimental data for 44Ti(,p)
– 4 data points– Energies higher than
those required to study the reaction at astrophysically relevant temperatures
– Found a rate 2x higher than the SMOKER rates.
– Hoffman et al., [ApJ 715 (2010)] recalculated a rate from this data & find a rate consistent with NON-SMOKER within uncertainties
Only measurements are by Sonzogni et al. [PRL 84 (2000)] :
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Jennifer Fallis - ERAWAST Workshop II - 2011
How to measure 44Ti(,p)47V:
• 44Ti targets? Daniel Bemmerer’s talk this morning
• 44Ti beams?
• On-line production using the ISOL technique followed by immediate acceleration
• Off-line production using an enriched source of 44Ti, available through the ERAWAST program in the TRIUMF off-line ion source
difficult to produce and extract
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Jennifer Fallis - ERAWAST Workshop II - 2011
The plan for 44Ti beams off-line:
• ISAC-I accelerator limited to A/q =6.
• Use of a stipping foil can provide beams of ions up to A=30
• For beams above A=30 high charge states are needed from the source.
• Supernanogan ECR source can provide these high charge states
• Beam up to A=150 from the off-line source can now be accelerated.
Supernanogan
SUPERNANOGAN
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Jennifer Fallis - ERAWAST Workshop II - 2011
44Ti (,p) Requirements
• Previous 44Ti(,p) experiment: 105 pps• A TUDA measurement 1 MeV lower in energy requires
~1012 total ions on target
• With ~1016 atoms available we would require:
0.01% combined source and accelerator efficiency
• More 44Ti and better efficiencies would allow for measurements at even lower energies.
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Jennifer Fallis - ERAWAST Workshop II - 2011
The plan for 44Ti beams off-line:
Source efficiencies depend on the method of acquiring material:
– Gas leak
– Sputter source
– Oven
Supernanogan
SUPERNANOGAN
1 - 10% efficiency
0.01 - 0.1% efficiency
… depends on chemical properties of material 0.1% - 1% ?
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Jennifer Fallis - ERAWAST Workshop II - 2011
The plan for 44Ti beams off-line
• 44Ti can be provided in the form of TiF4
• TiF4 sublimates at 284C
• Lessons from recent 33S beam:– Melting point 115C / Boiling point 445C– Didn’t even have to turn on oven to get a
good vapour pressure!
• There is a good chance of getting up to 1% efficiency out of source when using TiF4.
… But this needs testing…
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Jennifer Fallis - ERAWAST Workshop II - 2011
Efficiency tests - Done
Ti wire sputter test:
• Wire produced ~2.7- 3.6x109 pps 48Ti7+ at the source cup
• Ran for 5 days• 48Ti is 73.72% of natural abundance• No measured difference in Ti wire weight
after the test (0.1mg scale)
Minimum sputter efficiency was 0.017%
Good enough… but not great
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Jennifer Fallis - ERAWAST Workshop II - 2011
Efficiency tests - planned
• The Problems: – putting a small enough sample in the
Supernanogan to use it up in the time available for beam development
– Knowing how much material was in the sample
• The Solution: using a small amount of a low concentration solution of TiF4 in water.
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Jennifer Fallis - ERAWAST Workshop II - 2011
Efficiency tests - planned
• The Problems: – putting a small enough sample in the
Supernanogan to use it up in the time available for beam development
– Knowing how much material was in the sample
• The Solution: using a small amount of a low concentration solution of TiF4 in water.
–An oven for TiF4 tests has been ordered
–TiF4 needs to be acquired
–Hope to run in winter shutdown (late Dec. - early Apr.)
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Jennifer Fallis - ERAWAST Workshop II - 2011
SAFETY
- 44Ti is radioactive, t1/2 = 60 y
- No other long lived radioactive isotope ever used in OLIS
+ 14C experiment also has “stage 1” approval
(joining forces)
+ 44Ti beam was produced from an ECR source at Argonne National Lab.
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Jennifer Fallis - ERAWAST Workshop II - 2011
TRIUMF - ISAC I and II
TUDA 2
ISAC I: 150 keV/u - 1.9 MeV/u
ISAC II: up to 16 MeV/u
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Jennifer Fallis - ERAWAST Workshop II - 2011
The experiments: 44Ti(,p) at TUDA
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Jennifer Fallis - ERAWAST Workshop II - 2011
The experiments: 44Ti(,p) at TUDA
~200 keV
Up to 200 Torr of He
p
44Ti beam
47V and 44Ti stopped in exit window
∆E E
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Jennifer Fallis - ERAWAST Workshop II - 2011
The experiments: 44Ti(,p) at TUDA
10140.53
46514
219545
# 12 hour shiftsEvents/dayCross-section (mb)EC.M. (MeV)
With 106 pps beams
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Jennifer Fallis - ERAWAST Workshop II - 2011
So, we have a 44Ti beamwhat else can we do with it…
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Jennifer Fallis - ERAWAST Workshop II - 2011
44Ti production destruction
Magkotsios et al. (2010):
The et al.
(1998)44Ti(,p)47V 44Ti(,)48Cr - 44Ti(p,)45V
Rates used NON-SMOKER
SMOKER
Radiativecapture
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Jennifer Fallis - ERAWAST Workshop II - 2011
QuickTime™ and a decompressor
are needed to see this picture.
~20 keV/u
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Jennifer Fallis - ERAWAST Workshop II - 2011
Charge state booster(SNi foil, 100nm thick)
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Jennifer Fallis - ERAWAST Workshop II - 2011
Raw suppression for p-capture 108 - 1010
Up to 1015 with +H.I. coincidence
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Jennifer Fallis - ERAWAST Workshop II - 2011
Current experimental data for 44Ti(,)
(Yes, that’s really all there is…)
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Jennifer Fallis - ERAWAST Workshop II - 2011
Changes between SMOKER and NON-SMOKER codes:
result of suppression of (,) reactions on self conjugate nuclei
due to isospin selection rules
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Jennifer Fallis - ERAWAST Workshop II - 2011
44Ti (,) Requirements
• Expected yields for 44Ti(,): – 8.7x10-12 at high E limit of Gamow window (6.2 Mev)– 1.0x10-14 nearing lower limit of Gamow window (3.6
MeV)
• Yields down to 3x10-16 were measured at DRAGON during the 40Ca(,)44Ti measurement.
• For beams of 108 pps, at 6.2 Mev, we expect ~0.6 counts/hr at the end detector.
• Count rates of 0.5 counts/hr were measured in the 33S(p,) run
• We will be limited by time, which is -1 beam intensity
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Jennifer Fallis - ERAWAST Workshop II - 2011
• for 108 pps – 6.2 MeV: ~0.6 counts/hr at the end detector.
• for 109 pps– 6.2 MeV: ~6 counts/hr– 4.9 MeV (middle of Gamow window) : ~0.4
counts/hr
• For 1010 pps– 3.6 MeV: ~0.14 counts/hr
44Ti (,) Requirements
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Jennifer Fallis - ERAWAST Workshop II - 2011
Current experimental data for 44Ti(p,)
(… I’m sensing a trend …)
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Jennifer Fallis - ERAWAST Workshop II - 2011
NON-SMOKER cross sections for 44Ti(p,)
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Jennifer Fallis - ERAWAST Workshop II - 2011
ISAC-I beam energies: 150 keV/u - 1.9 MeV/u
44Ti(,): (for upper limit of Gamow window at 3 GK)
Eres = 6.2 MeV
Ebeam = 1.69 MeV/u
44Ti(p,): (for upper limit of Gamow window at 3 GK)
Eres = 3.4 MeV
Ebeam = 1.76 MeV/u
This is close to the limit of Ebeam to DRAGON, to measure radiative capture rates for higher temperaturs (up to 4.5 GK) …
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Jennifer Fallis - ERAWAST Workshop II - 2011
EMMA (ElectroMagnetic Mass Analyser)?
CH2 target PGAC, IC, Si detector, etc…
But not yet assembled or commissioned
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Jennifer Fallis - ERAWAST Workshop II - 2011
Summary of The Plan
• Test the efficiency of TiF4 from Supernanogan
• Acquire safety approval
• Run 44Ti(,p)47V at TUDA
• Guided by TUDA results, confirm or deny the NON-SMOKER rate for 44Ti(,)48Cr at DRAGON
• … Meanwhile, spend more time looking into the possibility of measuring 44Ti(p,)45V at both DRAGON and EMMA
Feasible on a ~1 yr time scale
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Jennifer Fallis - ERAWAST Workshop II - 2011
TRIUMF: J. Fallis, C. Ruiz, D. HutcheonU. Edinburgh: A. St.J. Murphy, G. Lotay, P. J. Woods,
M. Aliotta, T. Davinson, D. Mountford, G. Lotay, A. Shotter
U. York: B. R. Fulton, A. M. Laird, M. Taggart, S. Fox, C. A. Diget, M. Bently, J. Brown, P. Adsley
SFU: J. M. D’Auria UNBC: A. HusseinCSM: U. Greife, U. HagerMcMaster: A. A. Chen, J. Chen, D. Irvine, K. SetoodehniaTU-Munich: S. Bishop, A. Parikh, C. VockenhuberANL: J. Clark, C. Deibel
Collaborators
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Jennifer Fallis - ERAWAST Workshop II - 2011