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Stellar neutron capture cross sections of $^{41}$K and $^{45}$Sc
/ Heil, M (Darmstadt, GSI) ; Plag, R (Darmstadt, GSI) ; Uberseder, E (Notre Dame U.) ; Bisterzo, S (INFN, Turin ; Turin Observ.) ; Käppeler, F (KIT, Karlsruhe) ; Mengoni, A (CERN) ; Pignatari, M (Hull U. ; Konkoly Observ.)
The neutron capture cross sections of light nuclei (A<56) are important for s-process scenarios since they act as neutron poisons. We report on measurements of the neutron capture cross sections of K41 and Sc45, which were performed at the Karlsruhe 3.7 MV Van de Graaff accelerator via the activation method in a quasistellar neutron spectrum corresponding to a thermal energy of kT=25 keV. [...]
2016 - 8 p.
- Published in : Phys. Rev. C 93 (2016) 055807
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2.
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Stellar neutron capture cross sections of Ne20,21,22
/ Heil, M (Darmstadt, GSI) ; Plag, R (Darmstadt, GSI) ; Uberseder, E (Notre Dame U.) ; Gallino, R (Turin U.) ; Bisterzo, S (Turin U. ; Turin Observ.) ; Juseviciute, A (Karlsruhe, Inst. Technol.) ; Käppeler, F (Karlsruhe, Inst. Technol.) ; Lederer, C (U. Edinburgh (main)) ; Mengoni, A (CERN) ; Pignatari, M (Basel U.)
The stellar (n,γ) cross sections of the Ne isotopes are important for a number of astrophysical quests, i.e., for the interpretation of abundance patterns in presolar material or with respect to the s-process neutron balance in red giant stars. This paper presents resonance studies of experimental data in the keV range, which had not been fully analyzed before. [...]
2014 - 11 p.
- Published in : Phys. Rev. C 90 (2014) 045804
- Published in : Phys. Rev. C 92 (2015) 019902
APS Open Access article: PDF;
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3.
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Neutron Studies for Dating the Universe
/ Kappeler, F (Karlsruhe, Forschungszentrum) ; Fujii, K (INFN, Trieste) ; Mengoni, A (IAEA, Vienna ; CERN) ; Heil, M (Darmstadt, GSI) ; Mosconi, M (Braunschweig, Phys. Tech. Bund.) ; Domingo-Pardo, C (Darmstadt, GSI ; Valencia U., IFIC)
/n_TOF Collaboration
The neutron capture cross sections of (186)Os and (187)Os are of key importance for defining the 8-process abundance of (187)Os at the formation of the solar system. This quantity can be used to determine the radiogenic abundance component of (187)Os from the decay of (187)Re (t(1/2) = 41.2 Gyr) and to infer the time-duration of the nucleosynthesis in our galaxy (Re/Os cosmochronometer). [...]
2011
- Published in : J. Korean Phys. Soc. 59 (2011) 2094-2099
In : International Conference on Nuclear Data for Science and Technology 2010, Jeju Island, Republic Of Korea, 26 - 30 Apr 2010, pp.2094-2099
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4.
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5.
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First measurements of the total and partial stellar neutron cross sections to the s-process branching-point $^{79}Se$
/ Dillmann, I ; Heil, M ; Käppeler, F ; Fästermann, T ; Korschinek, G ; Knie, K ; Poutivtsev, M ; Rugel, G ; Wallner, A ; Rauscher, T
2006
- Published in : PoS: NIC-IX (2006) , pp. 089
Published version from PoS: PDF;
In : 9th International Symposium on Nuclear Astrophysic: Nuclei in the Cosmos, CERN, Geneva, Switzerland, 25 - 30 Jun 2006, pp.089
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6.
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Neutron capture cross section of $^{90}$Zr : Bottleneck in the s-process reaction flow
/ n_TOF Collaboration
The neutron capture cross sections of the Zr isotopes have important implications in nuclear astrophysics and for reactor design. The small cross section of the neutron magic nucleus 90Zr, which accounts for more than 50% of natural zirconium represents one of the key isotopes for the stellar s-process, because it acts as a bottleneck in the neutron capture chain between the Fe seed and the heavier isotopes. [...]
2008
- Published in : Phys. Rev. C 77 (2008) 035802
APS Published version, local copy: PDF;
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8.
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Cross section measurement of $^{209}Bi(n,\gamma)^{210}Bi^{g}$ and s-process abundance predictions in low-mass AGB stars
/ Bisterzo, S ; Käppeler, F ; Gallino, R ; Heil, M ; Domingo-Pardo, C
2006
- Published in : PoS: NIC-IX (2006) , pp. 077
Published version from PoS: PDF;
In : 9th International Symposium on Nuclear Astrophysic: Nuclei in the Cosmos, CERN, Geneva, Switzerland, 25 - 30 Jun 2006, pp.077
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9.
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Measurement of the partial ($n,\gamma$) cross section to $^{176}Lu^{m}$ at s-process temperatures
/ Winckler, N ; Dababneh, S ; Heil, M ; Käppeler, F ; Bisterzo, S ; Gallino, R
2006
- Published in : PoS: NIC-IX (2006) , pp. 192
Published version from PoS: PDF;
In : 9th International Symposium on Nuclear Astrophysic: Nuclei in the Cosmos, CERN, Geneva, Switzerland, 25 - 30 Jun 2006, pp.192
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10.
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Accelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sections
/ Wallner, A (Australian Natl. U., Canberra ; Vienna U.) ; Bichler, M (Atominstitut) ; Buczak, K (Vienna U.) ; Dillmann, I (Karlsruhe, Forschungszentrum) ; Käppeler, F (Karlsruhe, Forschungszentrum) ; Karakas, A (Res. Sch. Astron. Astrophys., Weston Creek) ; Lederer, C (Vienna U.) ; Lugaro, M (Konkoly Observ.) ; Mair, K (Vienna U.) ; Mengoni, A (CERN) et al.
The technique of accelerator mass spectrometry (AMS), offering a complementary tool for sensitive studies of key reactions in nuclear astrophysics, was applied for measurements of the C13(n,γ)C14 and the N14(n,p)C14 cross sections, which act as a neutron poison in s-process nucleosynthesis. Solid samples were irradiated at Karlsruhe Institute of Technology with neutrons closely resembling a Maxwell-Boltzmann distribution for kT=25 keV, and also at higher energies between En=123 and 182 keV. [...]
2016 - 12 p.
- Published in : Phys. Rev. C 93 (2016) 045803
Fulltext: PDF;
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