• A Ansari

      Articles written in Pramana – Journal of Physics

    • High-spin structure of neutron-rich Dy isotopes

      A Ansari H L Yadav M Kaushik U R Jakhar

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      In view of recent experimental progress on production and spectroscopy of neutron-rich isotopes of Dy with mass number A =166 and 168, we have made theoretical investigations on the structure of high spin states of164-170Dy isotopes in the cranked Hartree-Fock-Bogoliubov (CHFB) theory employing a pairingquadrupolehexadecapole model interaction. With the increase of neutron number the rotation alignment of the proton orbitals dominates the structure at high spins, which is clearly reflected in the spin dependence of the rotational g-factors. A particularly striking feature is the difference in the spin-dependent properties of166Dy as compared to that of164Dy

    • Structure of high spin states of76Kr and78Kr nuclei

      U R Jakhar H L Yadav A Ansari

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      Following a fully self-consistent cranked Hartree-Fock-Bogoliubov (CHFB) approach with a pairing+quadrupole+hexadecapole model interaction Hamiltonian the structure of the yrast states of76,78Kr nuclei is studied up to angular momentumJ = 24. Evolution of the shape with spin, and rotation alignment of proton as well as neutron 0g9/2 orbitals is investigated along with the inter and intra-nucleus variations of theg factors as a function ofJ. We find that the shape of78Kr remains prolate all through up toJ = 24, whereas76Kr becomes triaxial beyondJ = 12

    • Shape evolution in 76,78Kr nuclei at high spins in tilted axis cranking Hartree–Fock–Bogoliubov approach

      A Ansari P Sharma U R Jakhar H L Yadav

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      A two-dimensional tilted axis cranking Hartree–Fock–Bogoliubov (CHFB) calculation is performed for 76Kr and 78Kr nuclei up to high spins $J = 30$ employing a pairing-plus-quadrupole (PPQ) model interaction Hamiltonian. Intricate details of the evolution of single particle structures and shapes as a function of spin have been investigated. The results show the existence of energy levels with high 𝐾 quantum numbers lying close to the yrast line in both the nuclei. Such high 𝐾 states should exhibit isomeric characteristics due to the 𝐾-selection rules for the 𝛾-decays. Moreover, in 78Kr a new band with $J = 20–30$ lying below the observed ground band is predicted.

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