Results 21 to 30 of about 3,517,480 (298)

R-process enrichment from a single event in an ancient dwarf galaxy [PDF]

, 2015
Elements heavier than zinc are synthesized through the (r)apid and (s)low neutron-capture processes. The main site of production of the r-process elements (such as europium) has been debated for nearly 60 years.
A Dotter, A Frebel, A Frebel, A Frebel, A Frebel, A Wallner, AP Ji, AP Ji, AW McConnachie, B Wehmeyer, C Sneden, C Sneden, D Argast, DD Kelson, DL Burris, EM Burbidge, EN Kirby, EN Kirby, F Van de Voort, II Ivans, IU Roederer, J Abadie, J Bland-Hawthorn, JD Simon, K Bechtol, M Asplund, M Dominik, MC Geha, MG Walker, NR Tanvir, R Bernstein, S Goriely, S Shen, S Wanajo, SE Koposov, SE Koposov, T Tsujimoto, TH Greif, TM Brown, V Hill, Y Ishimaru, Y Komiya, YC Kim, YZ Qian   +43 more
core   +2 more sources

Effect of Injected Oxygen Amount on the Gas Porosity and Mechanical Properties of a Pore-Free Die-Cast Al–Si–Cu Alloy

Metals, 2021
With the rise in the demand for eco-friendly and electric vehicles, welding and heat treatment are becoming very important to meet the necessary weight reduction, complexity, and high functionality of die castings.
Ho-Jung Kang, Ho-Sung Jang, Seong-Hyo Oh, Pil-Hwan Yoon, Gyu-Heun Lee, Jin-Young Park, Yoon-Suk Choi   +6 more
doaj   +1 more source

r-process enhanched metal-poor stars [PDF]

Proceedings of International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX — PoS(NIC-IX), 2010
In this review we summarize the current state of some aspects of observational studies of low metallicity stars that have been enriched with products of rapid-neutron-capture (r-process) nucleosynthesis events. Attention will be drawn to the element domains where there is little star-tostar variation in relative abundances (such as the rare earths ...
Christopher Sneden, Ian Roederer, John Cowan, James E. Lawler   +3 more
openaire   +2 more sources

Neutrino Capture and r-Process Nucleosynthesis [PDF]

, 1998
We explore neutrino capture during r-process nucleosynthesis in neutrino-driven ejecta from nascent neutron stars. We focus on the interplay between charged-current weak interactions and element synthesis, and we delineate the important role of ...
Fuller, George M., McLaughlin, Gail C., Meyer, Bradley S.   +2 more
core   +2 more sources

β-delayed Fission in r-process Nucleosynthesis [PDF]

The Astrophysical Journal, 2018
Abstract We present β-delayed neutron emission and β-delayed fission (βdf) calculations for heavy, neutron-rich nuclei using the coupled Quasi-Particle Random Phase Approximation plus Hauser-Feshbach (QRPA+HF) approach. From the initial population of a compound nucleus after β-decay, we follow the statistical decay, taking into account ...
M. R. Mumpower, T. Kawano, T. M. Sprouse, N. Vassh, E. M. Holmbeck, R. Surman, P. Möller   +6 more
openaire   +2 more sources

Neutrino-Induced Fission and r-Process Nucleosynthesis [PDF]

, 2002
An r-process scenario with fission but no fission cycling is considered to account for the observed abundance patterns of neutron-capture elements in ultra-metal-poor stars.
Magain P., Y.-Z. Qian
core   +3 more sources

Stripping Model for Short GRBs: The Impact of Nuclear Data

Particles, 2023
We investigate the impact of forthcoming nuclear data on the predictions of the neutron star (NS) stripping model for short gamma-ray bursts. The main area to which we pay attention is the NS crust.
Andrey Yudin, Nikita Kramarev, Igor Panov, Anton Ignatovskiy   +3 more
doaj   +1 more source

Neutrino capture by r-process waiting-point nuclei [PDF]

, 1998
We use the Quasiparticle Random Phase Approximation to include the effects of low-lying Gamow-Teller and first forbidden strength in neutrino capture by very neutron-rich nuclei with N = 50, 82, or 126.
A. Hosaka, C. Gaarde, D. Cha, D.J. Horen, D.J. Horen, F. Krmpotic, G.C. McLaughlin, G.F. Bertsch, G.M. Fuller, H. Homma, H.G. Janka, J. Engel, J.A. Halbleib, J.D. Walecka, Jonathan Engel, K. Nakayama, R.D. Smith, Rebecca Surman, S.E. Woosley, Y.-Z. Qian, Y.-Z. Qian, Yong-Zhong Qian   +21 more
core   +4 more sources

β-delayed neutron emission of r-process nuclei at the N = 82 shell closure

Physics Letters B, 2021
Theoretical models of β-delayed neutron emission are used as crucial inputs in r-process calculations. Benchmarking the predictions of these models is a challenge due to a lack of currently available experimental data.
O. Hall, T. Davinson, A. Estrade, J. Liu, G. Lorusso, F. Montes, S. Nishimura, V.H. Phong, P.J. Woods, J. Agramunt, D.S. Ahn, A. Algora, J.M. Allmond, H. Baba, S. Bae, N.T. Brewer, C.G. Bruno, R. Caballero-Folch, F. Calviño, P.J. Coleman-Smith, G. Cortes, I. Dillmann, C. Domingo-Pardo, A. Fijalkowska, N. Fukuda, S. Go, C.J. Griffin, R. Grzywacz, J. Ha, L.J. Harkness-Brennan, T. Isobe, D. Kahl, L.H. Khiem, G.G. Kiss, A. Korgul, S. Kubono, M. Labiche, I. Lazarus, J. Liang, Z. Liu, K. Matsui, K. Miernik, B. Moon, A.I. Morales, P. Morrall, M.R. Mumpower, N. Nepal, R.D. Page, M. Piersa, V.F.E. Pucknell, B.C. Rasco, B. Rubio, K.P. Rykaczewski, H. Sakurai, Y. Shimizu, D.W. Stracener, T. Sumikama, H. Suzuki, J.L. Tain, H. Takeda, A. Tarifeño-Saldivia, A. Tolosa-Delgado, M. Wolińska-Cichocka, R. Yokoyama   +63 more
doaj   +1 more source

r-process observations [PDF]

EPJ Web of Conferences, 2018
The r-process nucleosynthesis in the Universe is constrained by observations of chemical abundances of the Solar System and those of old stars that should record the products of the r-process events in the early Universe. This review provides a brief overview of the observational technique to determine chemical abundances of stars.
openaire   +2 more sources