Publications (23)
Stellar (n,gamma) cross sections of p-process isotopes PartI: 102Pd, 120Te, 130,132Ba,and 156Dy
I. Dillmann, C. Domingo-Pardo, M. Heil +5
We have investigated the (n,gamma) cross sections of p-process isotopes with the activation technique. The measurements were carried out at the Karlsruhe Van de Graaff accelerator…
The s-Process in Low Metallicity Stars. II. Interpretation of High-Resolution Spectroscopic Observations with AGB models
S. Bisterzo, R. Gallino, O. Straniero +2
High-resolution spectroscopic observations of a hundred metal-poor Carbon and s-rich stars (CEMP-s) collected from the literature are compared with the theoretical nucleosynthesis…
Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures
C. Arlandini, F. Kaeppeler, K. Wisshak +4
The recently improved information on the stellar (n,gamma) cross sections of neutron-magic nuclei at N = 82, and in particular of 142Nd, turned out to represent a sensitive test fo…
s-Process in Low Metallicity Stars. III. Individual analysis of CEMP-s and CEMP-s/r with AGB models
S. Bisterzo, R. Gallino, O. Straniero +2
We provide an individual analysis of 94 carbon enhanced metal-poor stars showing an s-process enrichment (CEMP-s) collected from the literature. The s-process enhancement observed…
Neutron capture measurements at a RIA-type facility
R. Reifarth, R. C. Haight, M. Heil +2
Neutron capture cross sections of unstable isotopes are important for neutron induced nucleosynthesis as well as for technological applications. The Rare Isotope Accelerator (RIA)…
s-process nucleosynthesis of 142^Nd: crisis of the classical model
C. Arlandini, F. Kaeppeler, K. Wisshak +4
The recently improved information on the stellar neutron capture cross sections of neutron magic nuclei at N = 82, and in particular for 142^Nd, turned out to represent a sensitive…
AGB yields and Galactic Chemical Evolution: last updated
S. Bisterzo, C. Travaglio, M. Wiescher +7
We study the s-process abundances at the epoch of the Solar-system formation as the outcome of nucleosynthesis occurring in AGB stars of various masses and metallicities. The calcu…
Neutron Capture Cross Sections for the Weak s Process
M. Heil, A. Juseviciute, F. Kaeppeler +3
In past decades a lot of progress has been made towards understanding the main s-process component that takes place in thermally pulsing Asymptotic Giant Branch (AGB) stars. During…
GEANT simulations of neutron capture experiments with a 4p BaF2 detector
M. Heil, R. Reifarth, F. Kaeppeler +8
The goal of this research project is to give quantitative information useful for the design of a g-ray detector to investigate neutron capture (n, g) reactions on radioactive nucle…
s-Process in Low Metallicity Stars. I. Theoretical Predictions
S. Bisterzo, R. Gallino, O. Straniero +2
A large sample of carbon enhanced metal-poor stars enriched in s-process elements (CEMP-s) have been observed in the Galactic halo. These stars of low mass (M ~ 0.9 Msun) are locat…
The s-process branching at 185W
K. Sonnabend, P. Mohr, K. Vogt +6
The neutron capture cross section of the unstable nucleus 185W has been derived from experimental photoactivation data of the inverse reaction 186W(gamma,n)185W. The new result of…
128Xe and 130Xe: Testing He-shell burning in AGB stars
R. Reifarth, F. Kaeppeler, F. Voss +4
The s-process branching at 128I has been investigated on the basis of new, precise experimental (n,g) cross sections for the s-only isotopes 128Xe and 130Xe. This branching is uniq…
The 7Be(n,alpha)4He reaction and the Cosmological Lithium Problem: measurement of the cross section in a wide energy range at n_TOF (CERN)
M. Barbagallo, A. Musumarra, L. Cosentino +12
The energy-dependent cross section of the 7Be(n,alpha)4He reaction, of interest for the so-called Cosmological Lithium Problem in Big Bang Nucleosynthesis, has been measured for th…
Sensitivity of p-Process Nucleosynthesis to Nuclear Reaction Rates in a 25 Solar Mass Supernova Model
W. Rapp, J. Goerres, M. Wiescher +2
The astrophysical p process, which is responsible for the origin of the proton rich stable nuclei heavier than iron, was investigated using a full nuclear reaction network for a ty…
Survival of Nature's Rarest Isotope 180Ta under Stellar Conditions
P. Mohr, F. Kaeppeler, R. Gallino
The nucleosynthesis of nature's rarest isotope 180Ta depends sensitively on the temperature of the astrophysical environment because of depopulation of the long-living isomeric sta…
The stellar (n,gamma) cross section of 62Ni
H. Nassar, M. Paul, I. Ahmad +23
The 62Ni(n,gamma)63Ni(t_1/2=100+-2 yrs) reaction plays an important role in the control of the flow path of the slow neutron-capture (s-) nucleosynthesis process. We have measured…
Opportunities for Nuclear Astrophysics at FRANZ
R. Reifarth, L. P. Chau, M. Heil +6
The "Frankfurter Neutronenquelle am Stern-Gerlach-Zentrum" (FRANZ), which is currently under development, will be the strongest neutron source in the astrophysically interesting en…
The 14C(n,g) cross section between 10 keV and 1 MeV
R. Reifarth, M. Heil, C. Forssen +14
The neutron capture cross section of 14C is of relevance for several nucleosynthesis scenarios such as inhomogeneous Big Bang models, neutron induced CNO cycles, and neutrino drive…
Impact of Nuclear Reaction Uncertainties on AGB Nucleosynthesis Models
S. Bisterzo, R. Gallino, F. Kaeppeler +2
Asymptotic giant branch (AGB) stars with low initial mass (1 - 3 Msun) are responsible for the production of neutron-capture elements through the main s-process (main slow neutron…
Cross section measurements of Gd(n,) induced by thermal and epithermal neutrons
M. Mastromarco, A. Manna, O. Aberle +121
Neutron capture measurements on Gd and Gd were performed using the time-of-flight technique at the n\_TOF facility at CERN. Four samples in form of self-sustaining…
Experimental setup and procedure for the measurement of the 7Be(n,α)α reaction at n_TOF
L. Cosentino, A. Musumarra, M. Barbagallo +129
The newly built second experimental area EAR2 of the n_TOF spallation neutron source at CERN allows to perform (n, charged particles) experiments on short-lived highly radioactive…
CEMP-s and CEMP-s/r stars: last update
S. Bisterzo, R. Gallino, O. Straniero +3
We provide an updated discussion of the sample of CEMP-s and CEMP-s/r stars collected from the literature. Observations are compared with the theoretical nucleosynthesis models of…
Constraining the S factor of 15N(p,g)16O at Astrophysical Energies
P. J. LeBlanc, G. Imbriani, J. Goerres +44
The 15N(p,g)16O reaction represents a break out reaction linking the first and second cycle of the CNO cycles redistributing the carbon and nitrogen abundances into the oxygen rang…