Nuclear structure studies of nuclei near N=80

Abstract

High-spin states in ½¿ ½¿ Ba, ½¿ La, ½¿ Ce, ½¿ Nd were populated following (HI, Ò) reactions and subsequent radiation was studied using in-beam -ray spectroscopy methods. Level schemes with new states belonging to the above mentioned nuclei are given. These nuclei situated near AE ¼ have been analysed within the framework of the interactingboson model (IBM), applied to the description of even-even, odd-even and odd-odd nuclei to calculate excitation energies and electromagnetic properties for the above mentioned nuclei.

Ba136studied via deep-inelastic collisions: Identification of the(νValiente-Dobón1, Regan2, Wheldon3 et al. 2004Phys. Rev. C771120View full textAdd to dashboardCite

“…The N = 80 isotone lies between the lighter barium isotopes which can be readily populated using this method [11] and heavier, neutron-rich isotopes which have been studied as residues from spontaneous fission [12][13][14]. To date, the data on the near-yrast states in 136 Ba come from work using ␤ decay [15], ͑n , ␥͒ reactions [16], Coulomb excitation [17], and light-ion ͑ 9 Be͒ induced fusion reactions [18]. As a result, prior to this work, the highest spin state known was the yrast 8 + state identified by Dragulescu et al [18].…”

Calculate Energy Levels, Energy Ratios and Electric Quadrupole Transition Probability B(E2), of the Even-Even Yb-164 Isotopes Using IBM-1

“…In the present work, the interacting boson model (IBM-1) was used in the calculations of the energy levels, energy ratios, electric quadrupole transitions probability B(E2), It is through the results we obtained show that the isotope yb-164 has transitional properties (SU (3) -(SU (5). According to the values we obtained for energy levels, energy ratios and the probability of quadrupole transmission B(E2), Our results confirmed good agreement with the available experimental data.…”

“…One of the most important goals of this research is to show the structure of deformed nuclei Yb-164. The nucleus of this class has transitional properties contain the two groups, SU(3) and SU (5). General formula of Hamiltonian operator for SU(3)-SU(5) region will represented by [8,9]:…”

“…Properties of this variety depend on the ratio of (/a 2 ), when the ratio is great it tends to be specific limiting SU (5)…”

“…According to this version (IBM-1), the bosons of s (L=0) and d (L=2) have six components (sub states) and therefore define a six dimensional space, this produce to characterize in terms of unification group in six ambit U(6) [4,5].that yields three dynamical chains: the SU(5), SU(3) and O(6 ).…”