Results 71 to 80 of about 11,516 (254)

Raman analysis of organic refractory materials after energetic processing: Evidence for amorphous carbon on TNOs and comets

Meteoritics &Planetary Science, EarlyView.
Abstract Amorphous carbon (αC) is found in various extraterrestrial particles, including those thought to originate from the outer Solar System. αC can form through two main processes involving C‐rich materials: exposure to energetic charged particles and thermal processing.
M. Germanà, A. Vyjidak, G. A. Baratta, B. M. Giuliano, R. G. Urso, C. Scirè, D. Fulvio, T. Grassi, P. Jusko, P. Caselli, M. E. Palumbo   +10 more
wiley   +1 more source

Astrophysics experiments with radioactive beams at ATLAS

AIP Advances, 2014
Reactions involving short-lived nuclei play an important role in nuclear astrophysics, especially in explosive scenarios which occur in novae, supernovae or X-ray bursts.
B. B. Back, J. A. Clark, R. C. Pardo, K. E. Rehm, G. Savard   +4 more
doaj   +1 more source

Laboratory for Underground Nuclear Astrophysics (LUNA)

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1994
A compact high-current 50 kV ion accelerator facility including a windowless gas target system, a beam calorimeter, and detector telescopes in close geometry has been built and tested. The data acquisition and analysis involved a multiparameter system and a Monte Carlo program.
U. Greife, C. Arpesella, C. A. Barnes, F. Bartolucci, E. Bellotti, C. Broggini, P. Corvisiero, FIORENTINI, Giovanni, A. Fubini, G. Gervino, F. Gorris, C. Gustavino, M. Junker, R. W. Kavanagh, A. Lanza, G. Mezzorani, P. Prati, P. Quarati, W. S. Rodney, C. Rolfs, W. H. Schulte, H. P. Trautvetter, D. Zahnow   +22 more
openaire   +3 more sources

The Ames impact structure, Oklahoma: New radioisotopic constraints and implications for North American impact chronology

Meteoritics &Planetary Science, EarlyView.
Abstract The Ames impact structure (Oklahoma) is thought to have formed during the Ordovician Meteor Event, based on conodont biostratigraphy of its crater fill. Here, U–Pb zircon dates from its impact‐melt portion, conducted using secondary ion mass spectrometry and laser ablation–inductively coupled plasma–mass spectrometry (n = 37 spots), yield a ...
Elizabeth J. Catlos, Andrew F. Parisi, Michael E. Brookfield, Timmons Erickson, Sean P.S. Gulick, Axel K. Schmitt, Daniel F. Stockli, Daniel P. Miggins, Ben Ruchte, Mark Cloos   +9 more
wiley   +1 more source

ELECTRO-PHOTOMETRY OF SATELLITES IN UZHGOROD BEGINS FROM ODESSA

Odessa Astronomical Publications, 2017
The contribution of photometric observations of satellites in solutions of many scientifically applied tasks is considered. The role of Odessa's astrophysics is specially showed in creation of this method in Laboratory of space researches of the Uzhgorod
V. P. Epishev, Y. M. Motrunich, I. I. Motrunich, I. F. Naubauer   +3 more
doaj   +1 more source

Origin and formation of a chondritic xenolith in Krymka (LL3.2, breccia): Indications for a late formation of the accretionary breccia

Meteoritics &Planetary Science, EarlyView.
Abstract An unusual chondritic xenolith was found in two sequentially prepared thin sections of a sample from the Krymka (LL3.2) chondrite. The xenolith has a rounded, slightly deformed shape of about 5 mm in apparent diameter and is partially surrounded by a double rim made of an inner fine‐grained silicate‐rich rim and an outer sulfide‐rich rim.
Aelita Girich, Addi Bischoff, Samuel Ebert, Kazuhide Nagashima, Andreas Morlok, Harald Hiesinger, Jasper Berndt   +6 more
wiley   +1 more source

Nanoscale space weathering features in mature lunar soil revealed by TEM and APT

Meteoritics &Planetary Science, EarlyView.
Abstract Space weathering significantly alters the optical, chemical, and structural properties of lunar regolith at micro‐ and nanoscales; yet detailed nanoscale variability within individual soils remains underexplored. Here we apply transmission electron microscopy (TEM) and atom probe tomography to four mineral grains (olivine, ilmenite, and two ...
Jennika Greer, Alexander M. Kling, Luke Daly, Dieter Isheim, David N. Seidman, Michelle S. Thompson, Philipp R. Heck   +6 more
wiley   +1 more source

Theoretical Study of Electron Capture, Excitation, and Ionization Processes in H+−H(2l) Collisions

The Astrophysical Journal Supplement Series
The processes of single-electron charge exchange, excitation, and ionization during proton impact on H(2 l ) are investigated. We employ two different theoretical methods that are suitable for different collision energy regions: the full quantum ...
Y. Wang, K. Wang, L. Liu, Y. Wu, F. Wang, J. G. Wang   +5 more
doaj   +1 more source

Strong Field QED, Astrophysics, and Laboratory Astrophysics

Astrophysical compact objects, such as magnetars, neutron star mergers, etc, have strong electromagnetic fields beyond the Schwinger field ($B_c = 4.4 \times 10^{13}\, {\rm G}$). In strong electric fields, electron-positron pairs are produced from the vacuum, gamma rays create electron-positron pairs in strong magnetic fields, and propagating photons ...
openaire   +2 more sources

Measurement and Modeling of Electron Temperature in Laboratory Photoionized Plasmas Relevant to Astrophysics

The Astrophysical Journal
The electron temperature of photoionized plasmas characterizes the thermalization of photoelectrons, impacts the charge-state distribution, emissivity, and opacity through atomic recombination processes, and is needed to perform detailed comparisons with
J. J. Rowland, R. C. Mancini, G. S. Jaar, D. C. Mayes, H. Scott, I. E. Golovkin, M. Chatzikos, G. Ferland, G. P. Loisel, J. E. Bailey   +9 more
doaj   +1 more source