Conveners
8 Experiments in nuclear astrophysics II
- Yasuki Nagai (Osaka University)
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Fritz Bosch (GSI Darmstadt, Germany)27/06/2006, 17:00Experiments in nuclear astrophysicsInvitedIon storage rings and ion traps have provided for the first time the opportunity to investigate beta decay of highly charged atoms, i.e. with only a few or even none bound electrons. The impact of this new field of research for nuclear astrophysics and, in particular, for s-process nucleosynthesis in hot stellar plasmas is obvious. In this talk an overview is given on the activities in...Go to contribution page
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Joachim Goerres (University of Notre Dame and Joint Institute for Nuclear Astrophysics)27/06/2006, 17:30Experiments in nuclear astrophysicsInvitedAlpha-induced reactions play an important role in a variety of astrophysical environments. They provide the neutron sources for the main s-process which takes place in highly convective AGB stars and for the weak process during core Helium burning in massive stars. In addition, alpha induced reactions on 15O and 18Ne provide a break-out from the CNO cycle which is important for the...Go to contribution page
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Daniel Schuermann (Ruhr-Universitaet Bochum)27/06/2006, 18:00Experiments in nuclear astrophysicsOral contributionThe fusion of carbon and helium via $^{12}$C$(\alpha,\gamma)^{16}$O in the helium burning phase of red giant stars is generally accepted to be a key reaction of nuclear astrophysics. Although there exist several direct and indirect measurements, the cross section in the Gamow peak is still not known sufficiently well. A new measurement of the $^{12}$C$(\alpha,\gamma)^{16}$O reaction cross...Go to contribution page
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C. Matei (Ohio University, Athens, OH)27/06/2006, 18:15Experiments in nuclear astrophysicsOral contributionThe cascade through the 6.049-MeV J(pi)=0+ state 16O of has rarely been discussed as contributing to the 12C(a,g)16O cross section at low energies largely due to experimental difficulties in observing this transition. We report here first measurements of this transition in 12C(a,g)16O using the DRAGON recoil separator facility at TRIUMF. The experiment was performed in inverse kinematics...Go to contribution page
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Hisham Nassar (Hebrew University, Jerusalem, Israel 91904)27/06/2006, 18:30Experiments in nuclear astrophysicsOral contributionThe 44Ti(t1/2= 59 y) nuclide is considered an important signature of core-collapse supernova (SN) nucleosynthesis and has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A SN remnant. We investigated in the laboratory the major 44Ti production reaction, 40Ca(alpha,gamma)44Ti (Ecm ~0.6-1.2 MeV/u), by off-line counting of 44Ti nuclei using accelerator mass...Go to contribution page
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Christof Vockenhuber (TRIUMF, Vancouver, BC, Canada)27/06/2006, 18:45Experiments in nuclear astrophysicsOral contribution44Ti (60.0 yr half-life) is one of the few short-lived radionuclides which has been detected in space by gamma-ray astronomy and thus confirm ongoing nucleosynthesis. Since it is produced predominantly in supernovae during the alpha-rich freezeout, its measured abundance can be used to constrain supernova models. The 40Ca(alpha,gamma)44Ti reaction plays a key role in 44Ti production. It...Go to contribution page