Neutron halos in hypernuclei |
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| Authors: | HF Lü J Meng SQ Zhang S-G Zhou |
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| Institution: | (1) School of Physics, Peking University, Beijing 100871, PRC, CN;(2) Institute of Theoretical Physics, Chinese Academy of Science, Beijing 100080, PRC, CN;(3) Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, PRC, CN |
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| Abstract: | Properties of single- Λ and double- Λ hypernuclei for even-N Ca isotopes ranging from the proton dripline to the neutron dripline are studied using the relativistic continuum Hartree-Bogoliubov
theory with a zero-range pairing interaction. Compared with ordinary nuclei, the addition of one or two Λ-hyperons lowers
the Fermi level. The predicted neutron dripline nuclei are, respectively, 75
ΛCa and 76
2ΛCa, as the additional attractive force provided by the Λ-N interaction shifts nuclei from outside to inside the dripline.
Therefore, the last bound hypernuclei have two more neutrons than the corresponding ordinary nuclei. Based on the analysis
of two-neutron separation energies, neutron single-particle energy levels, the contribution of continuum and nucleon density
distribution, giant halo phenomena due to the pairing correlation, and the contribution from the continuum are suggested to
exist in Ca hypernuclei similar to those that appear in ordinary Ca isotopes.
Received: 21 October 2002 / Accepted: 11 January 2003 / Published online: 8 April 2003 |
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| Keywords: | PACS 21 10 Gv Mass and neutron distributions – 21 60 -n Nuclear-structure models and methods – 21 60 Jz Hartree-Fock and random-phase approximations – 21 80 +a Hypernuclei |
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