Neutron drip line in odd and even mass calcium and nickel nuclei
- Department of Physics, University College of Science, University of Calcutta 92, Acharya Prafulla Chandra Road, Kolkata-700 009 (India)
Neutron-rich Ca and Ni nuclei have been studied in a spherical relativistic mean-field formalism in coordinate space. A {delta} interaction has been adopted to treat the pairing correlations for the neutrons. Odd nuclei have been treated in the blocking approximation. The effect of the positive-energy continuum and the role of pairing in the stability of nuclei have been investigated by use of the resonant-BCS approach. In Ca isotopes, N=50 is no longer a magic number, whereas in Ni nuclei, a new magic number emerges at N=70. There is a remarkable difference in the relative positions of the drip lines for odd and even isotopes. In Ca isotopes, the last bound even and odd nuclei are found to be {sup 72}Ca and {sup 59}Ca, respectively. In Ni isotopes, the corresponding nuclei are {sup 98}Ni and {sup 97}Ni, respectively. The origin of this difference in relative positions of the drip line in even and odd isotopes in the two chains is traced to the difference in the single-particle level structures and consequent modification in the magic numbers in the two elements. Pairing interaction is seen to play a major role. The effect of the width of the resonance states on pairing has also been investigated.
- OSTI ID:
- 20699064
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 72, Issue 4; Other Information: DOI: 10.1103/PhysRevC.72.044318; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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