Structure of high spin states of ⁷⁶Kr and ⁷⁸Kr nuclei

U R JAKHAR¹, H L YADAV¹ and A ANSARI²

¹Department of Physics, Rajasthan University, Jaipur 302 004, India

²Institute of Physics, Sachivalaya Marg, Bhubaneswar 751 005, India

E-mail: ansari@iopb.res.in

Abstract. 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 of $^{76,78}$Kr nuclei is studied up

to angular momentum $J$ = 24. Evolution of the shape with spin, and

rotation alignment of proton as well as neutron $0g_{9/2}$ orbitals

is investigated along with the inter- and intra-nucleus variations

of the $g$ factors as a function of $J$. We find that the shape of

$^{78}$Kr remains prolate all through up to $J = 24$, whereas

$^{76}$Kr becomes triaxial beyond $J = 12$.

Keywords. Kr nuclei; high spin states; $g$-factors; cranked

Hartree-Fock-Bogoliubov theory.

PACS Nos 27.50.+e; 21.10.-k; 21.10.Hw