impact of nuclear input on x-ray bursts
DESCRIPTION
Richard H. Cyburt Ryan Ferguson Zach Meisel Scott Warren Matthew Amthor Karl Smith Hendrik Schatz. Impact of Nuclear Input on X-ray bursts. Outline. Motivation nuclear physics in astrophysics X-ray bursts Astrophysics in nuclear physics Conclusions. Motivation. nova. - PowerPoint PPT PresentationTRANSCRIPT
SNP2008, Ohio University, July 8-11
Impact of Nuclear Input onX-ray bursts
Richard H. CyburtRyan FergusonZach MeiselScott WarrenMatthew AmthorKarl SmithHendrik Schatz
SNP2008, Ohio University, July 8-11
Outline
Motivation nuclear physics in astrophysics X-ray bursts Astrophysics in nuclear physics Conclusions
SNP2008, Ohio University, July 8-11
Motivation
Big Bang Nucleosynthesis
CR Nucleosynthesis
s-process
r-process
p-process
nova
supernova
x-ray bursts
stars
Origin of Elements!Explosion Light Curves!
SNP2008, Ohio University, July 8-11
A Closer Look
Nuclear Structure impacts nuclear astrophysics!
SNP2008, Ohio University, July 8-11
Let’s consider X-ray bursts
They’re explosions! They’re on neutron stars! They go off regularly! We can see ~1000s of them!
Sounds pretty cool, but… How easy are they to understand?
SNP2008, Ohio University, July 8-11
Type I X-ray bursts
Accreting H/He but not too fast
n.s. fairly old low B-field slow rotation
Thermonuclear runaway
SNP2008, Ohio University, July 8-11
rp-process
Helium burns to Carbon
rapid (p,)/(,p)/+ decays Up the N=Z line on nuclide chart
Peak brightness <A>~56
SNP2008, Ohio University, July 8-11
Movie
SNP2008, Ohio University, July 8-11
Nuclear input
Thermonuclear reaction rates Not well covered by expt. Relies heavily on theory Which relies on nuclide masses
weak decay rates Need & T dependent rates Good expt. g.s. coverage
Time lag incorporating new input
SNP2008, Ohio University, July 8-11
rp-process db summary
•expt based rates•thry based rates
SNP2008, Ohio University, July 8-11
New Theory Rates (p,)
Within a factor of 2
SNP2008, Ohio University, July 8-11
New Theory Rates (,p)
SNP2008, Ohio University, July 8-11
Impact of New Rates
SNP2008, Ohio University, July 8-11
Theory Rates
Rates are all Rauscher rates Small impact w/ Rauscher rates What about other models?
They need to be publically available!
SNP2008, Ohio University, July 8-11
JINA Reaclib Database
stores rxn rates in standard form
remembers old versions
Online interface easily accessible
Provides link of communication
SNP2008, Ohio University, July 8-11
www.nscl.msu.edu/~nero/db
SNP2008, Ohio University, July 8-11
Conclusions
Goal: nuke input not dom. uncertainty Use x-ray bursts to understand n.s. constrain exotic physics
Nuclear astro. gaining much ground new expt. facilities/techniques large computational efforts Theories ever-scrutinized