Dynamic Deformation Theory and Multiphonon Vibrational Bands in 154Gd

Abstract

Dynamic deformation theory based on a pairing plus quadrupole model (DPPQ model) is extended to 25 levels belonging to various multi phonon vibrational bands in 15 4 Gd. Although the calculated excited band energies are too high by factors of 1·4-1·7, there is generally reasonable agreement with the experimental energies, B(E2) values, magnetic moments, E2-Ml mixing ratios and EO moments. Many new values are predicted. A brief comparison with some results derived from a new version of dynamic deformation theory, the so-called DNSB model, is also given.

Reexamining the nuclear structure of Gd154 in the dynamic pairing plus quadrupole model

“…A detailed analysis for this assignment is given in [15,18]. ) level, taken as the I π = 2 + member of a K π = 0 5 + band in [9], is replaced by 1775.4 keV I π =2 + one, built on the band head 0 5 + at 1650.34 keV [13].…”

“…They cited the results of our previous calculation [9] in the DPPQ model with inconclusive arguments and emphasized the need of a fresh analysis [15]. Further, Wu et al [19] studied the issue of anharmonicity of the K π =4 + γγ band in 154 Gd and other nuclei of this region.…”

“…Earlier in (1979), the band structures of 154 Gd were studied in the microscopic theory of dynamic pairing plus quadrupole model [8], wherein the decay character of the eight even-parity collective bands of this nucleus were analyzed [9]. Much new data on this nucleus have become available in the last four decades and many new concepts in nuclear theory have evolved meanwhile.…”

“…As stated above, the DPPQ model was employed to interpret the multiphonon structures in terms of full β-γ vibration mixings [9]. In that work, besides the six bands, given.…”

Study of Multiphonon γγ-band of 154Gd through Modified Soft Rotor Formula

“…Sousa et al [18] and Gupta et al [19] extended the experimental studies upto 25 even-parity states of this nucleus. In 1979, Kumar et al [20] presented the experimental data of 154 Gd nucleus and explained it with dynamic pairing plus quadrupole model. With the advancement in experimental techniques, improved and advance data could be accumulated.…”