Abstract. Primordial or Big Bang nucleosynthesis (BBN) is one of the three strong evidences for the Big-Bang model together with the expansion of the Universe and the Cosmic Microwave Background radiation. In this study, we extend the nuclear network until sodium, to evaluate the primordial CNO abundance that could affect Population III stellar evolution. The complete network includes more than 400 reactions, out of which ≈270 reaction rates were calculated using the TALYS code. We performed a sensitivity study to identify the important reactions for CNO nucleosynthesis. We note the stability of results on Big Bang nucleosynthesis CNO production compared to previous works: CNO/H = (0.5 − 3.) × 10 −15 .

No abstract

No abstract

No abstract

We show a novel self-matching resonance acceleration regime for generating dense relativistic electron beams by using ultraintense circularly polarized laser pulses in near-critical density plasmas. When the self-generated quasistatic axial magnetic field is strong enough to pinch and trap thermal relativistic electrons, an overdense electron bunch is formed in the center of the laser channel. In the trapping process, the electron betatron frequencies and phases can be adjusted automatically to match the resonance condition. The matched electrons are accelerated continuously and a collimated electron beam with overcritical density, helical structure, and plateau profile energy spectrum is hence generated.