Original scientific paper
Continuum states in neutron-rich calcium and nickel nuclei
M. Bhattacharya
; Department of Physics, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata-700 009, India
G. Gangopadhyay
; Department of Physics, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata-700 009, India
Abstract
The effect of the resonant continuum on Ca and Ni nuclei near the neutron drip line has been investigated. The relativistic mean-field equations are solved using scattering-like conditions for the positive energy states. Pairing is implemented through a zero range interaction and the BCS equations are solved including the resonant states. We find that our calculation can reproduce the values for binding energy, radius, two-neutron separation energy, etc. in most cases. The nuclei 70,72Ca show a sudden increase in the tail of the density distribution as the 3s1/2 state, being very weakly bound and having no centrifugal barrier, extends outside the nucleus radius to a large distance creating a neutron halo. Ni isotopes do not show any neutron halo. Appearance of new magic number and disappearance of the old ones in neutron-rich isotopes lead to dramatic difference in the drip line for even- and odd-mass nuclei in the two chains.
Keywords
Ca and Ni nuclei; neutron rich isotopes; resonant continua; relativistic mean-field equations; binding energy; radius; two-neutron separation energy; neutron halo; new magic number
Hrčak ID:
304465
URI
Publication date:
1.7.2007.
Visits: 105 *