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 qp 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 qp for the lithium isotopes nuclei were obtained (qp(7Li) = 1.20 ± 0.10fm-1 and qp(7Li) = 1.35 ± 0.10 fm-1), which are much lower than qp of 4He, 12C, 40Ca, 48Ca and 56Fe nuclei (qp » 2 fm-1). The graph represented the qp 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 qp dependence from the parameter x and predicts the qp value for the Coulomb sum of the 9Be nucleus not yet measured.
Highlights
Отримано нові експериментальні значення кулонівських сум ядер 6Li та 7Li в діапазоні переданих імпульсів q = 0,750 ÷ 1,000 фм-1 та q = 0,750 ÷ 1,125 фм-1, відповідно, які суттєво розширюють діапазон по q раніше опублікованих кулонівських сум цих ядер
The experiment was designed so that the response functions at several constant 3-momentum transfer values with q ranging from 0.750 to 1.625 fm-1, and the Coulomb sums corresponding to these functions, could be obtained from the measurements
We arrive at understanding of the intermediate value qр = 1.65 fm-1 of the 12С nucleus, which is clusterized substantially less than the nuclei of the lithium isotopes
Summary
Что зависимость кулоновских сумм от переданного импульса ядер 6Li и 7Li существенно отличается от таких зависимостей для всех других ядер. In the treatment of the experimental data, one must take into account the influence of the nuclear electrostatic field on the incident electron For this purpose, the correction ΔЕ0 is introduced into the definition of the 3-momentum transfer q = {4 (E0 + ΔЕ0) [(E0 + ΔЕ0) − ω] sin2(θ/2) + ω2}1/2. In the 7Li case, in the measurement range q = 1.250 ÷ 1.625 fm-1 [8], the function SL(q) is constant within the experimental error and is equal to unity It means that if the SL(q) value is lower at certain momentum transfers, it will reach the plateau range at qр ≤ 1.3 fm-1. For the purpose it is necessary: a) to determine the qp value for the 7Li nucleus; b) to define more exactly the qp value for the 6Li nucleus; c) to obtain the qp values for the previously investigated nuclei
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