The electron screening in the Li-7(p, alpha)alpha reaction has been studied at E-p = 30 to 100 keV for different environments: Li2WO4 insulator, Li metal, and PdLi alloys. For the insulator a screening potential energy of U-e = 185 +/- 150 eV was observed, consistent with previous work and the atomic adiabatic limit. However, for the Li metal and the PdLi alloys we find large values of U-e = 1280 +/- 60 and 3790 +/- 330 eV, respectively: the values can be explained by the plasma model of Debye applied to the quasi-free metallic electrons in these samples. Similar results have been found for the Li-6(p, alpha)He-3 reaction supporting the hypothesis of the isotopic independence of the electron screening effect. The data together with previous studies of d(d, p)t and Be-9(p, alpha)Li-6 in metals verify the Debye model scaling U-e proportional to Z(t) (charge number of target)
Electron screening in 7Li and 6LiHe for different environments / J., Cruz; Z., Fülöp; G., Gyürky; F., Raiola; DI LEVA, Antonino; Limata, BENEDICTA NORMANNA; M., Fonseca; H., Luis; D., Schürmann; M., Aliotta; H. W., Becker; A. P., Jesus; K. U., Kettner; J. P., Ribeiro; C., Rolfs; Romano, Mario; E., Somorjai; F., Strieder. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 624:(2005), pp. 181-185. [10.1016/j.physletb.2005.08.036]
Electron screening in 7Li and 6LiHe for different environments
DI LEVA, ANTONINO;LIMATA, BENEDICTA NORMANNA;ROMANO, MARIO;
2005
Abstract
The electron screening in the Li-7(p, alpha)alpha reaction has been studied at E-p = 30 to 100 keV for different environments: Li2WO4 insulator, Li metal, and PdLi alloys. For the insulator a screening potential energy of U-e = 185 +/- 150 eV was observed, consistent with previous work and the atomic adiabatic limit. However, for the Li metal and the PdLi alloys we find large values of U-e = 1280 +/- 60 and 3790 +/- 330 eV, respectively: the values can be explained by the plasma model of Debye applied to the quasi-free metallic electrons in these samples. Similar results have been found for the Li-6(p, alpha)He-3 reaction supporting the hypothesis of the isotopic independence of the electron screening effect. The data together with previous studies of d(d, p)t and Be-9(p, alpha)Li-6 in metals verify the Debye model scaling U-e proportional to Z(t) (charge number of target)I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
