arXiv:1906.06724·v1·Nuclear Theory
Fusion hindrance effects in laser-induced non-neutral plasmas
Salvatore Simone Perrotta (1, 2 3, and 4) · Aldo Bonasera (2 and 4) ((1) Dipartimento di Fisica e Astronomia, Università degli studi di Catania, (2) Scuola Superiore di Catania, Università degli studi di Catania, (3) Cyclotron Insitute, Texas A&M University, (4) Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare)
Abstract
Inertial confinement fusion hotspots and cluster Coulomb explosion plasmas may develop a positive net electric charge. The Coulomb barrier penetrability and the rate of nuclear fusion reactions at ultra-low energies ( keV) are altered by such an environment. These effects are here studied via the screening potential approach. Approximate analytical results are developed by evaluating the average screening potential for some scenarios of interest. It is found that fusion is hindered for reactions between thermal fuel nuclei, while an enhancement is expected for secondary and "beam-target" reactions. Depending on the plasma conditions, the variations can be relevant even for relatively small net charges (several % difference or more in the fusion rate for an average net charge per nucleus of proton charges).
Comments: 19 pages, 6 figures. Accepted by Nuclear Physics A (in press)