Results for “LANTHANUM 155”

DOE OSTI2019

Nuclear Data Sheets for A=155

This work represents an update of the previous evaluation of the nuclear data on the A=155 nuclides (2005Re01). The experimental data from reaction and decay studies leading to the following nuclides have been reviewed: {sup 155}La, {sup 155}Ce, {sup 155}Pr, {sup 155}Nd, {sup 155}Pm, {sup 155}Sm, {sup 155}Eu, {sup 155}Gd, {sup 155}Tb, {sup 155}Dy, {sup 155}Ho, {sup 155}Er, {sup 155}Tm, {sup 155}Yb, {sup 155}Lu, {sup 155}Hf, and {sup 155}Ta. These data are presented, together with the adopted level schemes and their properties.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗

DOE OSTI2020

Accurate CI-MBPT calculation of radiative lifetimes and transition probabilities of neutral lanthanum (La I) odd states with J = 3/2

In this work, an accurate calculation of radiative lifetimes and transition probabilities of the first 21 odd states with a total angular momentum J = 3/2 was performed for La I using configuration-interaction many-body perturbation theory (CI-MBPT). A technique to obtain correct transition amplitudes was devised for pairs of states with substantial mixing that improved the theoretical accuracy. The results were compared to known experimental and theoretical data for the considered transitions. It has been shown that the transition data calculated with CI-MBPT and with corrections for pairs of mixed states are in good agreement with the latest experimental data of Den Hartog et al, 2015 J. Phys. B: At. Mol. Phys. 48, 155 001, better than other theoretical results. The transition data can find many applications in astrophysics, and the CI-MBPT formalism with mixing correction is applicable to other atoms similar to or more complex than La I.

36 MATERIALS SCIENCE↗