Results 71 to 80 of about 21,366 (192)

Indirect Measurement of the 3He(n,p)3H Reaction Cross Section at Big Bang Energies

The Astrophysical Journal
Neutron-induced nuclear reactions play an important role in the Big Bang Nucleosynthesis. Their excitation functions are, from an experimental point of view, usually difficult to measure.
R. G. Pizzone, M. L. Sergi, A. A. Oliva, T. Zanatta-Martinez, L. Lamia, R. Spartá, G. L. Guardo, M. La Cognata, G. D’Agata, S. Palmerini, A. Tumino, M. Costa, D. Cittadino, A. Di Pietro, P. Figuera, I. Indelicato, A. Massara, S. Cherubini, G. G. Rapisarda, S. Romano, C. Spampinato, M. Couder, W. Tan, M. Wiescher, D. Lattuada, M. Gulino, V. Burjan, J. Mrazek, M. La Commara, M. Mazzocco, P. M. Prajapati, S. Aguilar, T. Anderson, D. Bardayan, D. Blankstein, L. Callahan, A. Clark, B. Frentz, A. Gula, M. Hall, S. L. Henderson, R. Kelmar, Q. Liu, J. Long, A. Majundar, S. McGiunness, A. Nelson, P. O’Malley, C. Seimour, M. Skulski, J. Wilkinson, S. M. Cha, K. Y. Chae, M. S. Kwag, S. Typel   +54 more
doaj   +1 more source

The evolving Planck mass in classically scale-invariant theories

Journal of High Energy Physics, 2017
We consider classically scale-invariant theories with non-minimally coupled scalar fields, where the Planck mass and the hierarchy of physical scales are dynamically generated.
K. Kannike, M. Raidal, C. Spethmann, H. Veermäe   +3 more
doaj   +1 more source

Heavy sterile neutrinos: Bounds from big-bang nucleosynthesis and SN 1987A [PDF]

, 2000
Cosmological and astrophysical effects of heavy (10 - 200 MeV) sterile Dirac neutrinos, mixed with the active ones, are considered. The bounds on mass and mixing angle from both supernovae and big-bang nucleosynthesis are presented.Comment: 19 pages, 5 ...
A.D. Dolgov, Ahluwalia, Armbruster, Barate, Barbieri, Barger, Barger, Conrad, D.V. Semikoz, Dolgov, Dolgov, Dolgov, Dolgov, Dolgov, Dolgov, Eitel, Eitel, Ellis, Enqvist, Fishbach, G. Raffelt, Kainulainen, Kalogeropoulous, Lobashev, Nötzold, S.H. Hansen, Weinheimer, Weinheimer   +27 more
core   +2 more sources

Heavy Elements and Electromagnetic Transients from Neutron Star Mergers

Annalen der Physik, Volume 536, Issue 2, February 2024.
Astro‐(physics) has made major leaps forward through the combined information provided by both gravitational waves and electromagnetic emission from the first detected neutron star merger event. This review provides an up‐to‐date overview of today's understanding of neutron star mergers and their electromagnetic emission and it discusses possible ...
Stephan Rosswog, Oleg Korobkin
wiley   +1 more source

Nuclear astrophysicists at war

Natural Sciences, Volume 4, Issue 1, January 2024.
The Manhattan program not only opened the path to the nuclear age for humans, but also triggered a lot of new questions and research directions in nuclear physics and astrophysics that still inform the ideas in these fields today. Abstract The question of energy production in stars stimulated an entire generation of young physicists in the 1930s who ...
Michael Wiescher, Karlheinz Langanke
wiley   +1 more source

Toward a self-consistent and unitary reaction network for big-bang nucleosynthesis

EPJ Web of Conferences, 2014
Unitarity, the mathematical expression of the conservation of probability in multichannel reactions, is an essential ingredient in the development of accurate nuclear reaction networks appropriate for nucleosynthesis in a variety of environments.
Paris Mark W., Brown Lowell S., Hale Gerald M., Hayes-Sterbenz Anna C., Jungman Gerard, Kawano Toshihiko, Fuller George M., Grohs Evan B., Kunieda Satoshi   +8 more
doaj   +1 more source

Did the Universe start at Zero Metallicity?

, 1999
Standard Big Bang nucleosynthesis predicts an essentially zero primordial metallicity. I speculate on possible metal (i.e. nucleon number A\geq 12) production in scenarios of inhomogeneous Big Bang nucleosynthesis.
Jedamzik, K.
core   +2 more sources

R-parity violation and the cosmological gravitino problem [PDF]

, 2001
Based on the R-parity violation option of the minimal supersymmetric Standard Model, we examine the scenario where the massive gravitino, relic from the hot big-bang, is the lightest supersymmetric particle and can decay through one or several of the ...
Chemtob, M., Moreau, G.
core   +2 more sources

Sharpening the predictions of big-bang nucleosynthesis [PDF]

, 1999
Motivated by the recent measurement of the primeval abundance of deuterium, we re-examine the nuclear inputs to big-bang nucleosynthesis (BBN). Using Monte-Carlo realization of the nuclear cross-section data to directly estimate the theoretical ...
C. Brune, C. J. Copi, D. N. Schramm, E. G. Adelberger, G. Schmid, G. Steigman, H. Reeves, H. Volk, J. Osborne, James W. Truran, K. A. Olive, K. Olive, Kenneth M. Nollett, L. Ma, M. H. Pinsonneault, M. S. Smith, Michael S. Turner, N. Hata, P. Bonifacio, R. G. H. Robertson, R. Lopez, S. Burles, S. Burles, S. Vauclair, Scott Burles, Y. Izotov, Y. Izotov, Y. Izotov   +27 more
core   +2 more sources

Big Bang Nucleosynthesis constraints on f(T,T) gravity

Physics Letters B
Big Bang Nucleosynthesis provides us with an observational insight into the very early Universe. Since this mechanism of light element synthesis comes out of the standard model of particle cosmology which follows directly from General Relativity, it is ...
Sai Swagat Mishra, Ameya Kolhatkar, P.K. Sahoo   +2 more
doaj   +1 more source