Results 51 to 60 of about 28,372 (160)

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

3He(α,γ)7Be cross section measured using complementary techniques

EPJ Web of Conferences, 2014
The astrophysical S-factor for the 3He(α,γ)7Be reaction plays an important role in the Solar Standard Model and in the Big Bang Nucleosynthesis scenario. The advances from two recent experiments performed using complementary techniques at center of mass (
Carmona-Gallardo M., Rojas A., Borge M.J.G., Davids B., Fulton B.R., Hass M., Nara Singh B.S., Ruiz C., Tengblad O.   +8 more
doaj   +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

A New Mechanism for Generating Particle Number Asymmetry through Interactions

Advances in High Energy Physics, Volume 2019, Issue 1, 2019., 2019
A new mechanism for generating particle number asymmetry (PNA) has been developed. This mechanism is realized with a Lagrangian including a complex scalar field and a neutral scalar field. The complex scalar carries U(1) charge which is associated with the PNA.
Takuya Morozumi, Keiko I. Nagao, Apriadi Salim Adam, Hiroyuki Takata, Subhajit Saha   +4 more
wiley   +1 more source

Introduction to Big Bang Nucleosynthesis and Modern Cosmology [PDF]

, 2017
Primordial nucleosynthesis remains as one of the pillars of modern cosmology. It is the testing ground upon which many cosmological models must ultimately rest. It is our only probe of the universe during the important radiation-dominated epoch in the first few minutes of cosmic expansion.
arxiv   +1 more source

Inflation in f(R, ϕ) Gravity with Exponential Model

Advances in High Energy Physics, Volume 2018, Issue 1, 2018., 2018
We are taking action of f(R) gravity with a nonminimal coupling to a massive inflaton field. A f(R, ϕ) model is chosen which leads to the scalar-tensor theory which can be transformed to Einstein frame by conformal transformation. To avoid the vagueness of the frame dependence, we evaluate the exact analytical solutions for inflationary era in Jordan ...
Farzana Kousar, Rabia Saleem, M. Zubair, Torsten Asselmeyer-Maluga   +3 more
wiley   +1 more source

Astrophysical S-factor for the 2H(ρ,γ)3He reaction at big-bang nucleosynthesis energies [PDF]

EPJ Web of Conferences, 2020
We report on our latest experimental study of the 2H(ρ,γ)3He reaction in the energy range of interest for big-bang nucleosynthesis. The differential cross section at 135° and γ)-ray angular distributions were measured and compared with the results ...
Tišma Isabela, Lipoglavšek Matej, Mihoviloviĉ Miha, Markelj Sabina, Vencelj Matjaž, Vesić Jelena   +5 more
doaj   +1 more source

Revisiting big-bang nucleosynthesis constraints on dark-matter annihilation

Physics Letters B, 2015
We study the effects of dark-matter annihilation during the epoch of big-bang nucleosynthesis on the primordial abundances of light elements. We improve the calculation of the light-element abundances by taking into account the effects of anti-nucleons ...
Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi, Yoshitaro Takaesu   +3 more
doaj   +1 more source

Long Lived Charged Massive Particles and Big Bang Nucleosynthesis [PDF]

AIPConf.Proc.903:587-590,2007, 2006
We consider Big Bang Nucleosynthesis(BBN) with long lived charged massive particles. Before decaying, the long lived massive particles recombines with a light element to form a bound state like a hydrogen atom. We discuss the possible change of primordial light element abundances due to formations of such bound states.
arxiv   +1 more source

Did the Universe start at Zero Metallicity? [PDF]

, 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. It is conceivable, though not necessarily probable, that some primordial metallicity is synthesized if a small fraction of all cosmic ...
arxiv   +1 more source