Shape changes in odd-Even Osmium Isotopes

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عنوان دوره: اولین دوره بین المللی و بیست و هشتمین دوره ملی (1400)
The electromagnetic spectrum of the gamma rays resulting for the excited nucleus in high-spin always for studying of nuclear structure, especially, for neutron-rich heavy deformed nuclei in the rare-earth region with 180 < A < 200, was important. In this paper, the energy levels of 185-187-189Os isotopes using the projected shell model (PSM) have been calculated. Yrast Spectrum, nucleus rotation frequency and the ratio of reduced electromagnetic transition probabilities, B(E2)/B(M1) plots versus spin for understanding the structure of multi-quasiparticle band up to the spins 47/2+, 33/2+ and 31/2+ for these isotopes, are plotted, respectively. It was found that in spins 35/2+, 31/2+ and 27/2+ due to 3-quasiparticle band-crossing, simultaneously by increasing rotational inertia of the nucleus, nucleus rotation frequency decreases greatly and as an important result, B(E2)/B(M1) ratio, the electrical properties of nucleus in these spins increase. Indeed, in these isotopes, observed that by increasing neutron number, the deformation parameter, ε2 decreases as well and by increasing spin in especial spins, due to nucleon alignment phenomenon, the nucleus rotational behavior decreases invers the vibration mode.
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