Results 71 to 80 of about 128,346 (229)

Cosmic ray exposure and gas retention ages of the shocked angrite Northwest Africa 7203: Implications for a collisional history of angrites' parent body

Meteoritics &Planetary Science, EarlyView.
Abstract Angrites and eucrites are among the oldest basaltic rocks in the solar system. However, the shock histories of these meteorite groups differ markedly, as most angrites show little to no evidence of shock metamorphism. While some angrites exhibit weak wavy extinction in olivine, indicative of low‐level shock, only two—Northwest Africa (NWA ...
Atsushi Takenouchi, Hirochika Sumino, Hideyuki Hayashi, Takashi Mikouchi, Martin Bizzarro   +4 more
wiley   +1 more source

Ultra-high charge electron acceleration for nuclear applications

Fundamental Plasma Physics
Ultra-intense laser-plasma wakefield accelerator possess several superior properties compared with the traditional radio-frequency accelerators. These characteristics include femtosecond duration, micro-source size, and ultra-dense beam density, result ...
Liming Chen, Jie Feng, Wenchao Yan, Hao Xu, Yaojun Li, Wenzhao Wang, Xulei Ge, Xiaojun Huang, Jie Zhang   +8 more
doaj   +1 more source

Few-body reactions investigated with the Trojan Horse Method

SciPost Physics Proceedings, 2020
The Trojan Horse Method is an indirect method to measure reaction cross sections at energies of interest for nuclear astrophysics, exploiting the nuclei clustering properties.
Roberta Spartà, Giuseppe G. Rapisarda, Claudio Spitaleri, M. La Cognata, Rosario G. Pizzone, S. Romano, Aurora Tumino
doaj   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

Sulfide–Metal Assemblages on CR2 Chondrule Rims: Products of Nebular Fission–Sulfidization and Parent Body Oxidation–Serpentinization

Meteoritics &Planetary Science, EarlyView.
Abstract We conducted a scanning electron microscopy (SEM) and transmission electron microscopy (TEM) study of sulfide–metal assemblages (SMAs) in minimally to moderately altered CR2 chondrites. The assemblages occur on chondrule rims and consist of kamacite cores rimmed by pyrrhotite.
S. A. Singerling, A. J. Brearley
wiley   +1 more source

Nuclear inputs relevant to nuclear astrophysics, status and perspectives [PDF]

EPJ Web of Conferences
Nuclear physics influences are present throughout the Universe at every scale. Over the past decades, significant efforts have been dedicated to various fields related to nucleosynthesis and stellar evolution.
Goriely Stéphane, Ryssens Wouter, Hilaire Stéphane, Péru Sophie   +3 more
doaj   +1 more source

26Mg target for nuclear astrophysics measurements

EPJ Web of Conferences, 2018
Two nuclear reactions of astrophysical interest, 26Mg(3He,d)27Al and 26Mg(d,p)27Mg, were measured for extraction of the Asymptotic Normalization Coefficients.
Siváček I., Mrázek J., Kroha V., Burjan V., Glagolev V., Piskoř Š., Spitaleri C., Pizzone R.G., La Cognata M., D’Agata G., Tumino A., Lamia L., Spartá R., Rapisard G.G., Romano S.   +14 more
doaj   +1 more source

Recent Astrophysics Results from ORELA and Possible Future Experiments at ORELA and SNS

, 2002
I present some recent results from experiments at the Oak Ridge Electron Linear Accelerator (ORELA) and discuss their impact in nuclear astrophysics. I then describe some possible future nuclear astrophysics experiments at ORELA and at the Spallation ...
Koehler, P. E.
core   +1 more source

Chromite in main group pallasite meteorites: Accessory mineral tracing planetesimal differentiation

Meteoritics &Planetary Science, EarlyView.
Abstract Main group pallasite meteorites (PMG) are samples of an early, highly differentiated magmatic planetesimal dominated by olivine and metal‐sulfide‐phosphide assemblages with accessory chromite among other phases. This mineralogy reflects mantle‐ and core‐related reservoirs, but the relative contributions of each and the overall petrogenesis are
Seann J. McKibbin, Lutz Hecht, Matthew S. Huber, Christina Makarona, Stepan M. Chernonozhkin, Philippe Claeys, Steven Goderis   +6 more
wiley   +1 more source

Underground nuclear astrophysics studies with CASPAR

EPJ Web of Conferences, 2016
The drive of low-energy nuclear astrophysics laboratories is to study the reactions of importance to stellar burning processes and elemental production through stellar nucleosynthesis, over the energy range of astrophysical interest.
Robertson Daniel, Couder Manoel, Greife Uwe, Strieder Frank, Wiescher Michael   +4 more
doaj   +1 more source