J. Condensed Matter Nucl. Sci. 13 (2014) 615–623 Research Article On Problems of Widom–Larsen Theory Applicability to Analysis and Explanation of Rossi Experiments Vladimir Vysotskii Kiev National Shevchenko University, Kiev, Ukraine Abstract The effectiveness and possibility of application of Widom–Larsen (W–L) theory for explanation of Rossi experiments on stimulation of (p, Ni A ) low-energy nuclear reactions (LENR) is analyzed. The carried out analysis has shown thatW–L theory, which is connected with the inverse reaction of beta-decay in variable electric field of surface plasmon in metal hydride, is unsuitable for the description and explanation of Rossi experiments in metal hydrides. © 2014 ISCMNS. All rights reserved. ISSN 2227-3123 Keywords: Inverse beta-decay, LENR, Ponderomotive force, Rossi experiments,Widom–Larsen theory 1. Introduction Theoretical explanation of important Rossi–Focardi (R–F) experiments (e.g. [1,2]) is usually associated with Widom– Larsen (W–L) theory (see [3–8]). The general scenario of such theory includes three consecutive steps. Process of increase of electron mass with m e > 0 by “dressed up” effect and formation of slow heavy electrons by ponderomotive nonlinear action of variable electric field of surface plasmon; Transformations of protons, which are situated in the form of monoatomic hydrogen layer on Ni surface, into slow neutrons in inverse reaction of beta-decay ˜ e - + p n + ν, ˜ m e m e + E/c 2 , E = m e c 2 > |Q e - p |, Q e - p ≈-0.78 MeV (1) with the help of “dressed up” heavy electrons. For realization of such reaction the variable electric field |E(r,t)| max ≥|E(r,t)| thresh 3 × 10 10 V/cm is needed [1,2]. E-mail: vivysotskii@gmail.com © 2014 ISCMNS. All rights reserved. ISSN 2227-3123