Erratum: Ni 62 (n,γ) and Ni 63 (n,γ) cross sections measured at the n-TOF facility at CERN [Phys. Rev. C (2014) 89 (025810)]
(2015)
Journal Article
Tsinganis, A., Tassan-Got, L., Tarrío, D., Tain, J. L., Tagliente, G., Schmidt, S., Schillebeeckx, P., Lederer, C., Massimi, C., Berthoumieux, E., Colonna, N., Dressler, R., Guerrero, C., Gunsing, F., Käppeler, F., Kivel, N., Pignatari, M., Reifarth, R., Schumann, D., Wallner, A., …Sarmento, R. (2015). Erratum: Ni 62 (n,γ) and Ni 63 (n,γ) cross sections measured at the n-TOF facility at CERN [Phys. Rev. C (2014) 89 (025810)]. Physical Review C - Nuclear Physics, 92(1), Article 019903. https://doi.org/10.1103/physrevc.92.019903
All Outputs (115)
Galactic evolution of rapid neutron capture process abundances: The inhomogeneous approach (2015)
Journal Article
Wehmeyer, B., Pignatari, M., & Thielemann, F.-K. (2015). Galactic evolution of rapid neutron capture process abundances: The inhomogeneous approach. Monthly notices of the Royal Astronomical Society, 452(2), 1970-1981. https://doi.org/10.1093/mnras/stv1352For the origin of heavy r-process elements, different sources have been proposed, e.g., core-collapse supernovae or neutron star mergers. Old metal-poor stars carry the signature of the astrophysical source(s). Among the elements dominantly made by t... Read More about Galactic evolution of rapid neutron capture process abundances: The inhomogeneous approach.
The first direct measurement of ¹²C (¹²C,n) ²³Mg at stellar energies (2015)
Journal Article
Bucher, B., Tang, X. D., Fang, X., Heger, A., Alamaraz-Calderon, S., Alongi, A., Ayangeakaa, A. D., Beard, M., Best, A., Browne, J., Cahillane, C., Couder, M., deBoer, R. J., Kontos, A., Lamm, L., Li, Y. J., Long, A., Lu, W., Lyons, S., Notani, M., …Woosley, S. E. (2015). The first direct measurement of ¹²C (¹²C,n) ²³Mg at stellar energies. Physical review letters, 114(25), 251102. https://doi.org/10.1103/PhysRevLett.114.251102Neutrons produced by the carbon fusion reaction ¹²C(¹²C,n)²³Mg play an important role in stellar nucleosynthesis. However, past studies have shown large discrepancies between experimental data and theory, leading to an uncertain cross section extrapo... Read More about The first direct measurement of ¹²C (¹²C,n) ²³Mg at stellar energies.
Nucleosynthesis simulations for the production of the p-nuclei 92Mo and 94Mo in a Supernova type II model (2015)
Journal Article
Göbel, K., Glorius, J., Koloczek, A., Pignatari, M., Reifarth, R., Schach, R., & Sonnabend, K. (2015). Nucleosynthesis simulations for the production of the p-nuclei 92Mo and 94Mo in a Supernova type II model. EPJ Web of Conferences, 93, 03006. https://doi.org/10.1051/epjconf/20159303006We present a nucleosynthesis sensitivity study for the γ-process in a Supernova type II model within the NuGrid research platform. The simulations aimed at identifying the relevant local production and destruction rates for the p-nuclei of molybdenum... Read More about Nucleosynthesis simulations for the production of the p-nuclei 92Mo and 94Mo in a Supernova type II model.
Sulfur isotopic compositions of submicrometer SiC grains from the Murchison meteorite (2015)
Journal Article
Xu, Y., Zinner, E., Gallino, R., Heger, A., Pignatari, M., & Lin, Y. (2015). Sulfur isotopic compositions of submicrometer SiC grains from the Murchison meteorite. The Astrophysical journal, 799(2), 156. https://doi.org/10.1088/0004-637x/799/2/156We report C, Si, N, S, Mg-Al, and Ca-Ti isotopic compositions of presolar silicon carbide (SiC) grains from the SiC-rich KJE size fraction (0.5-0.8 μm) of the Murchison meteorite. One thousand one hundred thirteen SiC grains were identified based on... Read More about Sulfur isotopic compositions of submicrometer SiC grains from the Murchison meteorite.
Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: Evolution to the end of core helium burning (2015)
Journal Article
Jones, S., Hirschi, R., Pignatari, M., Heger, A., Georgy, C., Nishimura, N., Fryer, C., & Herwig, F. (2015). Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: Evolution to the end of core helium burning. Monthly notices of the Royal Astronomical Society, 447(4), 3115-3129. https://doi.org/10.1093/mnras/stu2657Massive stars are key sources of radiative, kinetic and chemical feedback in the Universe. Grids of massive star models computed by different groups each using their own codes, input physics choices and numerical approximations, however, lead to inco... Read More about Code dependencies of pre-supernova evolution and nucleosynthesis in massive stars: Evolution to the end of core helium burning.
New insights on Ba overabundance in open clusters : evidence for the intermediate neutron-capture process at play? (2014)
Journal Article
Mishenina, T., Pignatari, M., Carraro, G., Kovtyukh, V., Monaco, L., Korotin, S., Shereta, E., Yegorova, I., & Herwig, F. (2015). New insights on Ba overabundance in open clusters : evidence for the intermediate neutron-capture process at play?. Monthly notices of the Royal Astronomical Society, 446(4), 3651-3668. https://doi.org/10.1093/mnras/stu2337Recently, an increasing number of studies were devoted to measure the abundances of neutron-capture elements heavier than iron in stars belonging to Galactic Open Clusters (OCs). OCs span a sizeable range in metallicity (−0.6 ≤ [Fe/H] ≤ +0.4), and th... Read More about New insights on Ba overabundance in open clusters : evidence for the intermediate neutron-capture process at play?.
Stellar neutron capture cross sections of ²⁰ ²¹ ²²Ne (2014)
Journal Article
Heil, M., Plag, R., Uberseder, E., Gallino, R., Bisterzo, S., Juseviciute, A., Käppeler, F., Lederer, C., Mengoni, A., & Pignatari, M. (2014). Stellar neutron capture cross sections of ²⁰ ²¹ ²²Ne. Physical Review C, 90(4), 045804-1-045804-11. https://doi.org/10.1103/PhysRevC.90.045804The 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... Read More about Stellar neutron capture cross sections of ²⁰ ²¹ ²²Ne.
High-resolution abundance analysis of red giants in the globular cluster NGC 6522 (2014)
Journal Article
Barbuy, B., Chiappini, C., Cantelli, E., Depagne, E., Pignatari, M., Hirschi, R., Cescutti, G., Ortolani, S., Hill, V., Zoccali, M., Minniti, D., Trevisan, M., Bica, E., & Gómez, A. (2014). High-resolution abundance analysis of red giants in the globular cluster NGC 6522. Astronomy and Astrophysics, 570, A76. https://doi.org/10.1051/0004-6361/201424311© 2014 ESO. Context. The [Sr/Ba] and [Y/Ba] scatter observed in some galactic halo stars that are very metal-poor and in a few individual stars of the oldest known Milky Way globular cluster NGC 6522 have been interpreted as evidence of early enrich... Read More about High-resolution abundance analysis of red giants in the globular cluster NGC 6522.
Measurement of the MACS of 159Tb(n, γ) at kT=30 keV by Activation (2014)
Journal Article
Praena, J., Mastinu, P., Pignatari, M., Quesada, J., Capote, R., & Morilla, Y. (2014). Measurement of the MACS of 159Tb(n, γ) at kT=30 keV by Activation. Nuclear data sheets, 120, 205-207. https://doi.org/10.1016/j.nds.2014.07.047The measurement of the Maxwellian-Averaged Cross-Section (MACS) of the 159 Tb(n, γ) reaction at kT=30 keV by the activation technique is presented. An innovative method for the generation of Maxwellian neutron spectra at kT=30 keV is used. An experim... Read More about Measurement of the MACS of 159Tb(n, γ) at kT=30 keV by Activation.
Neutron Capture Reactions on Fe and Ni Isotopes for the Astrophysical s-process (2014)
Journal Article
Lederer, C., Giubrone, G., Massimi, C., Žugec, P., Barbagallo, M., Colonna, N., Domingo-Pardo, C., Guerrero, C., Gunsing, F., Käppeler, F., Tain, J., Altstadt, S., Andrzejewski, J., Audouin, L., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., …Schumann, D. (2014). Neutron Capture Reactions on Fe and Ni Isotopes for the Astrophysical s-process. Nuclear data sheets, 120, 201-204. https://doi.org/10.1016/j.nds.2014.07.046Neutron capture cross sections in the keV neutron energy region are the key nuclear physics input to study the astrophysical slow neutron capture process. In the past years, a series of neutron capture cross section measurements has been performed at... Read More about Neutron Capture Reactions on Fe and Ni Isotopes for the Astrophysical s-process.
MESA and NuGrid simulations of classical novae: CO and ONe nova nucleosynthesis (2014)
Journal Article
Denissenkov, P. A., Truran, J. W., Pignatari, M., Trappitsch, R., Ritter, C., Herwig, F., Battino, U., Setoodehnia, K., & Paxton, B. (2014). MESA and NuGrid simulations of classical novae: CO and ONe nova nucleosynthesis. Monthly notices of the Royal Astronomical Society, 442(3), 2058-2074. https://doi.org/10.1093/mnras/stu1000Classical novae are the result of thermonuclear flashes of hydrogen accreted by CO or ONe white dwarfs, leading eventually to the dynamic ejection of the surface layers. These are observationally known to be enriched in heavy elements, such as C, O a... Read More about MESA and NuGrid simulations of classical novae: CO and ONe nova nucleosynthesis.
Measurement of the 241Am and the 243Am Neutron Capture Cross Sections at the n_TOF Facility at CERN (2014)
Journal Article
Riego, A., Reifarth, R., Rauscher, T., Sarmento, R., Rubbia, C., Roman, F., Schumann, D., Schmidt, S., Schillebeeckx, P., Wallner, A., Vlastou, R., Vlachoudis, V., Vermeulen, M., Versaci, R., Ventura, A., Vaz, P., Variale, V., Vannini, G., Valenta, S., Tsinganis, A., …Schumann, D. (2014). Measurement of the 241Am and the 243Am Neutron Capture Cross Sections at the n_TOF Facility at CERN. Nuclear data sheets, 119, 65-68. https://doi.org/10.1016/j.nds.2014.08.020The capture cross sections of 241 Am and 243 Am were measured at the n TOF facility at CERN in the epithermal energy range with a BaF 2 Total Absorption Calorimeter. A preliminary analysis of the 241 Am and a complete analysis of the 243 Am measureme... Read More about Measurement of the 241Am and the 243Am Neutron Capture Cross Sections at the n_TOF Facility at CERN.
Measurement of the neutron capture cross section of the c235U with the CERN n_TOF total absorption calorimeter and a fission tagging based on micromegas detectors (2014)
Journal Article
Žugec, P., Wright, T., Weiß, C., Weigand, M., Ware, T., Wallner, A., Vlastou, R., Vlachoudis, V., Vermeulen, M., Versaci, R., Balibrea, J., Mendoza, E., Cano-Ott, D., Guerrero, C., Berthoumieux, E., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., …Tsinganis, A. (2014). Measurement of the neutron capture cross section of the c235U with the CERN n_TOF total absorption calorimeter and a fission tagging based on micromegas detectors. Nuclear data sheets, 119, 10-13. https://doi.org/10.1016/j.nds.2014.08.005© 2014 Elsevier Inc. All rights reserved. Current and future nuclear technologies require more accurate nuclear data on (n,γ) cross sections and the α-ratios of fissile isotopes. Their measurement presents several difficulties, mainly related to the... Read More about Measurement of the neutron capture cross section of the c235U with the CERN n_TOF total absorption calorimeter and a fission tagging based on micromegas detectors.
Measurement of the 54,57Fe (n,γ) cross section in the resolved resonance region at CERN n_TOF (2014)
Journal Article
Valenta, S., Vannini, G., Variale, V., Vaz, P., Ventura, A., Versaci, R., Wright, T., Ware, T., Weiß, C., Weigand, M., Žugec, P., Giubrone, G., Domingo-Pardo, C., Taín, J. L., Lederer, C., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., …Versaci, R. (2014). Measurement of the 54,57Fe (n,γ) cross section in the resolved resonance region at CERN n_TOF. Nuclear data sheets, 119, 117-120. https://doi.org/10.1016/j.nds.2014.08.033© 2014 Elsevier Inc. 54 Fe and 57 Fe are stable iron isotopes, which play an important role in the nucleosynthesis of theslow neutron capture process (s process). In addition, these nuclei are present in many structuralmaterials, and therefore, the k... Read More about Measurement of the 54,57Fe (n,γ) cross section in the resolved resonance region at CERN n_TOF.
High-precision measurement of the 238U (n,γ) cross section with the Total Absorption Calorimeter (TAC) at n_TOF, CERN (2014)
Journal Article
Wright, T., Guerrero, C., Billowes, J., Ware, T., Cano-Ott, D., Mendoza, E., Massimi, C., Mingrone, F., Gunsing, F., Berthoumieux, E., Lampoudis, C., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Boccone, V., Bosnar, D., …Vermeulen, M. (2014). High-precision measurement of the 238U (n,γ) cross section with the Total Absorption Calorimeter (TAC) at n_TOF, CERN. Nuclear data sheets, 119, 26-30. https://doi.org/10.1016/j.nds.2014.08.009The neutron capture cross section of 238 U is fundamental to the design and operation of current reactors and future fast nuclear reactors, and thus must be measured to a high level of accuracy. An experiment has been performed at the CERN n TOF faci... Read More about High-precision measurement of the 238U (n,γ) cross section with the Total Absorption Calorimeter (TAC) at n_TOF, CERN.
Investigation of neutron-induced reactions at n_TOF: An overview of the 2009-2012 experimental program (2014)
Journal Article
Guerrero, C., Altstadt, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., Belloni, F., Berthoumieux, E., Billowes, J., Boccone, V., Bosnar, D., Brugger, M., Calviani, M., Calviño, F., Cano-Ott, D., Carrapiço, C., Cerutti, F., Chiaveri, E., Chin, M., …Tarrío, D. (2014). Investigation of neutron-induced reactions at n_TOF: An overview of the 2009-2012 experimental program. Nuclear data sheets, 119, 5-9. https://doi.org/10.1016/j.nds.2014.08.004The neutron time-of-flight facility n TOF is operating at CERN (Switzerland) since 2001, having started in 2009 a new campaign with an upgraded spallation target. The ambitious program carried out includes a large number of experiments in nuclear tec... Read More about Investigation of neutron-induced reactions at n_TOF: An overview of the 2009-2012 experimental program.
Barium isotopic composition of mainstream silicon carbides from Murchison : constraints for s-process nucleosynthesis in asymptotic giant branch stars (2014)
Journal Article
Savina, M. R., Pellin, M. J., Willingham, D. G., Pignatari, M., Bisterzo, S., Cristallo, S., Dauphas, N., Davis, A. M., Gallino, R., Gyngard, F., Herwig, F., Liu, N., Pellin, M. J., Savina, M., Straniero, O., & Willingham, D. (2014). Barium isotopic composition of mainstream silicon carbides from Murchison : constraints for s-process nucleosynthesis in asymptotic giant branch stars. The Astrophysical journal, 786(1), 66. https://doi.org/10.1088/0004-637x/786/1/66We present barium, carbon, and silicon isotopic compositions of 38 acid-cleaned presolar SiC grains from Murchison. Comparison with previous data shows that acid washing is highly effective in removing barium contamination. Strong depletions in δ(138... Read More about Barium isotopic composition of mainstream silicon carbides from Murchison : constraints for s-process nucleosynthesis in asymptotic giant branch stars.
Current quests in nucleosynthesis: Present and future neutron-induced reaction measurements (2014)
Journal Article
Praena, J., Pignatari, M., Mastinu, P., Martín-Hernández, G., Prete, G., Quesada, J., & Sabaté-Gilarte, M. (2014). Current quests in nucleosynthesis: Present and future neutron-induced reaction measurements. EPJ Web of Conferences, 66, 07022. https://doi.org/10.1051/epjconf/20146607022We present some open questions in nucleosynthesis focused on the measurement of relevant neutron capture cross-sections and on new experimental methods. We review the recent 63 Ni(n,γ) experiment carried out at the n-TOF facility at CERN and its astr... Read More about Current quests in nucleosynthesis: Present and future neutron-induced reaction measurements.
Ni62(n,γ) and Ni63(n,γ) cross sections measured at the n_TOF facility at CERN (2014)
Journal Article
Lederer, C., Massimi, C., Berthoumieux, E., Colonna, N., Dressler, R., Guerrero, C., Gunsing, F., Käppeler, F., Kivel, N., Pignatari, M., Reifarth, R., Schumann, D., Wallner, A., Altstadt, S., Andriamonje, S., Andrzejewski, J., Audouin, L., Barbagallo, M., Bécares, V., Bečvář, F., …Tassan-Got, L. (2014). Ni62(n,γ) and Ni63(n,γ) cross sections measured at the n_TOF facility at CERN. Physical Review C - Nuclear Physics, 89(2), Article 025810. https://doi.org/10.1103/physrevc.89.025810The cross section of the Ni62(n,γ) reaction was measured with the time-of-flight technique at the neutron time-of-flight facility n-TOF at CERN. Capture kernels of 42 resonances were analyzed up to 200 keV neutron energy and Maxwellian averaged cross... Read More about Ni62(n,γ) and Ni63(n,γ) cross sections measured at the n_TOF facility at CERN.