fusion reactions in nuclear astrophysics: the …fusion reactions in nuclear astrophysics: the music...
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Fusion reactions in nuclear astrophysics:The MUSIC approachThe MUSIC approach
Sergio AlmarazCalderonSergio AlmarazCalderonPhysics Division
Argonne National Laboratory2014 ATLAS USER'S MEETING
05/15/2014
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Carbon burning reactions in the starsCarbon burning in massive stars
Ignition phase of Type Ia supernovae
X-ray binariesNASA/CXC/PSU/L
University of Chicago Flash Center
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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H. Schatz
XRay Bursts and Superbursts
●H and He burning (rpprocess)H and He burning (rpprocess)
●Xray burst lightcurves ~ 10 sec – minutesXray burst lightcurves ~ 10 sec – minutes
Accreting neutron star
M ~ 1 – 2 M⊙R ~ 10 km
~ 10Ρ 14 g/cm3
Accretion rate ~ 0.5–50 kg/cm2/s of H or He
Normal burstNormal burst
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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What powers the ‘superbursts’?
Deep burning: Carbon fusion
Fusion of neutronrich light nuclei (C, O, Ne) 12C + 12C....24C + 24C
X.D. Tang et al., J. Phys.Conf. Ser. 381, 012120 (2012).
D.G. Yakovlev et al., Phys. Rev. C 82, 044609 (2010).
~ 3hrs
SuperburstsSuperbursts
H. Schatz
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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MUSICMUSICMUltiSampling Ionization Chamber
●Medium size high efficiency active target / gasfilled detector●Measurement of energy losses along a particle track ●Measurement of excitation function with a single beam energy
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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p(10B,10C)n
H2
10B, E~ 80 MeV ~ 100 pnA
Multiple
gas cells
Debunching
resonator rf sweeper
Superconducting solenoid
Radioactive beam production at ATLAS:InFlight techniqueInFlight technique 10C: 1H(10B,10C)n: 500/s
[11C: 2H(10B,11C)n]: 2000/s 12C 13C 14C 15C: 2H(14C,15C)p: 2000/s
ATLAS
10,12,13,14,15C + 12C experimental campaign
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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Beam signalSum
Left
rightLeft
Right
Eventbyevent analysis
Fusion signal
Na
NeO
C
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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15C14C
15NTo
F (
a .u
.)
ΔEcath
(a.u.)
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
MUSIC performance with Radioactive ion beams
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Results
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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S. AlmarazCalderon ATLAS user's meeting 05/15/2014
What powers the ‘superbursts’?
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What powers the ‘superbursts’?
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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Digital MUSICMeasure exit channels 12CH4 + 14,16,18,19,20O12CH4 + 20,21,22,23,24Ne20,22Ne + 20,21,22,23,24Ne208Pb + 20,21,22,23,24Ne…
Future work
We have performed the first measurements of the total fusion cross sections in the systems 10,14,15C + 12C using a new active targetdetector system.
In the energy region accessible with existing radioactive beams a good agreement between the experimental and theoretical cross sections is observed.
Summary
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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AknowledgementsAknowledgementsP. F. F. Carnelli, K. E. RehmP. F. F. Carnelli, K. E. Rehm,, M. Albers, M. Alcorta, M. Avila, B. Digiovine, H. Esbensen, D. Henderson, C. L. Jiang,1 J. Lai, O. Nusair, R. C. Pardo, M. Paul, D. SantiagoGonzalez, and C. Ugalde
Thank you!Thank you!
S. AlmarazCalderon ATLAS user's meeting 05/15/2014