fusion reactions in nuclear astrophysics: the …fusion reactions in nuclear astrophysics: the music...
TRANSCRIPT
Fusion reactions in nuclear astrophysics:The MUSIC approachThe MUSIC approach
Sergio AlmarazCalderonSergio AlmarazCalderonPhysics Division
Argonne National Laboratory2014 ATLAS USER'S MEETING
05/15/2014
Go to ”Insert (View) | Header and Footer" to add your organization, sponsor, meeting name here; then, click "Apply to All"2
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
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
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
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
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
Beam signalSum
Left
rightLeft
Right
Eventbyevent analysis
Fusion signal
Na
NeO
C
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
15C14C
15NTo
F (
a .u
.)
ΔEcath
(a.u.)
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
MUSIC performance with Radioactive ion beams
Results
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
What powers the ‘superbursts’?
What powers the ‘superbursts’?
S. AlmarazCalderon ATLAS user's meeting 05/15/2014
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
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