On electron screening effects in the low‐energy ³He(d, p)⁴He data

Abstract

Abstract.We have calculated the screening effects of the two electrons in the atomic 3He gas target on the low-energy3He(d, p)4He data. The nuclear degrees of freedom have been described within the microscopic multi-channel Resonating Group Method, while the two electrons have been treated in BornOppenheimer approximation deriving the exact screening potential within the Path Integral Monte Carlo method. Our model underestimates the observed screening effects implying the need to consider the coupling of nuclear and electronic degrees of freedom.

Pairing in nuclear systems: from neutron stars to finite nuclei

“…56) in which all time-reversed pairs have equal amplitude is not necessarily the optimal one and allows only the study of S-pair structure. To explore the pair content of the ground state in a more general way (Alhassid et al, 1996;Langanke et al, 1996), we define proton pair creation operatorŝ…”

Nucleosynthesis in the Big Bang and in Stars

“…Using this value in Eq. (2.36), one significantly underestimates (22) the enhancement shown by the experimental data ( Fig. 2.3).…”

“…Applegate was able to demonstrate (44) that reaction chains exist that allow matter flow to 22 Ne, and even still heavier elements. The production of 22 Ne immediately raises interest, as this nucleus is known as a neutron source because of a large (α, n) cross section.…”

“…In this way, Weaver and Woosley (131) found that explosive burning has only minor effects on the abundances of most nuclides lighter than the iron-peak nuclides. Important exceptions are 22 Na and 26 Al-both elements are radioactive and can be used as tracers in observations-whose abundances are generally increased during the explosion. However, explosive burning has an effect ranging from significant to large on some of the nuclides in the mass range A ≈ 36 -64; it can either strongly increase (e.g., for 48 Ti) or decrease (e.g.…”

“…The production of 22 Ne immediately raises interest, as this nucleus is known as a neutron source because of a large (α, n) cross section. Thus, it was suggested that even a primordial r-process (see Section 5) might be possible in inhomogeneous Big Bang models.…”