MANIFESTATION OF NUCLEAR CLUSTERIZATION IN COULOMB SUMS

Abstract

The new experimental Coulomb sums values of ⁶Li and ⁷Li nuclei have been obtained at momentum transfers range q = 0.750¸ 1.000 fm^-1 and q = 0.750¸ 1.125 fm^-1, respectively, extending significantly the earlier reported momentum transfers range of Coulomb sums for these nuclei. The dependence of the ⁶Li and ⁷Li Coulomb sums on the momentum transferred is shown to differ substantially from same dependences for all the other investigated nuclei. It is suggested that the observed feature of the ⁶Li and ⁷Li Coulomb sums is related to a strong clusterization of these nuclei. The parameter q_p corresponding to the value of the momentum transferred, at which the Coulomb sum ceases to grow and remains constant for larger momentum transfers, is introduced. The values of the parameter q_p for the lithium isotopes nuclei were obtained (q_p(⁷Li) = 1.20 ± 0.10fm^-1 and q_p(⁷Li) = 1.35 ± 0.10 fm^-1), which are much lower than q_p of ⁴He, ¹²C, ⁴⁰Ca, ⁴⁸Ca and ⁵⁶Fe nuclei (q_p » 2 fm^-1). The graph represented the q_p values of the nuclei as a function of the isolation parameter x, which characterizing the degree of nuclear clusterization, is constructed. The obtained graph shows the explicit proportionality of the q_p dependence from the parameter x and predicts the q_p value for the Coulomb sum of the ⁹Be nucleus not yet measured.