Conveners
8 Experiments in nuclear astrophysics II
- Yasuki Nagai (Osaka University)
Fritz Bosch
(GSI Darmstadt, Germany)
27/06/2006, 17:00
Experiments in nuclear astrophysics
Invited
Ion 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...
Joachim Goerres
(University of Notre Dame and Joint Institute for Nuclear Astrophysics)
27/06/2006, 17:30
Experiments in nuclear astrophysics
Invited
Alpha-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...
Daniel Schuermann
(Ruhr-Universitaet Bochum)
27/06/2006, 18:00
Experiments in nuclear astrophysics
Oral contribution
The 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...
C. Matei
(Ohio University, Athens, OH)
27/06/2006, 18:15
Experiments in nuclear astrophysics
Oral contribution
The 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...
Hisham Nassar
(Hebrew University, Jerusalem, Israel 91904)
27/06/2006, 18:30
Experiments in nuclear astrophysics
Oral contribution
The 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...
Christof Vockenhuber
(TRIUMF, Vancouver, BC, Canada)
27/06/2006, 18:45
Experiments in nuclear astrophysics
Oral contribution
44Ti (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...
