| Summary: | In this paper, we present our achievement on the relativistic computations of the spectral lines for the levels belonging to the 6s[k]J, 4f[k]J, 5d[k]J, 6p[k]J, 7s[k]J, 5f[k]J, 6d[k]J, 7p[k]J and 8s[k]J intermediate Rydberg series in the heavy xenon-129 isotope. These spectral lines are identified by the energy levels, the transition rates, the oscillator strengths, the Landé gj-factors and the magnetic dipole hyperfine constant. Inasmuch as the transitions from the ground state to the 4f and 5f levels in addition to the 6p and 7p levels are forbidden by electric dipole selection rules, we computed all the 5p55d–5p5nf (4 ≤ n ≤ 5), 5p55d–5p5np (6 ≤ n ≤ 7), 5p56s–5p5np (6 ≤ n ≤ 7), 5p57s–5p56p, 5p56d–5p5nf (4 ≤ n ≤ 5), 5p56d–5p5np (6 ≤ n ≤ 7), 5p57s–5p57p and 5p58s–5p5np (6 ≤ n ≤ 7) transition arrays. The present accurate values of spectral lines are obtained by using the well-established multiconfiguration Dirac-Hartree-Fock (MCDHF) method in conjunction with the relativistic configuration interaction (RCI) calculations. The RCI calculations encompass further electron correlation effects. These effects include static electron-valence and core-valence correlation and core polarizations effects, the Breit and quantum electrodynamics (QED) corrections in addition to the effect of nuclear charge distribution. To provide a context for information in the accuracy associated with these values, a detailed comparison of our data with other experimental and theoretical data available in the database is made. On the whole, a good agreement has generally been observed for most of the spectral lines. These newcomers to the area of database with insights into nuclear fusion research, as they may provide diagnostic information on magnetically confined plasmas, they could be a reference point for the identification and de-blending of new spectral lines provided by astrophysics observations and space research. Keywords: Atomic structure, Atomic energy level, Dirac Hamiltonian in atomic theory, Oscillator strengths, Radiative transition rates, Landé gj-factor, Hyperfine constants
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