• U R Jakhar

      Articles written in Pramana – Journal of Physics

    • 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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