Skyrme-Hartree-Fock Description of the Nuclear Structure in Ca Isotopes (Ⅱ)Neutron Halo, Skin and Particles in the Classically Forbidden Area

Soojae Im; MENG Jie; ZHOU Shan-Gui; YANG Si-Chun; LONG Wen-Hui

Chinese Physics C> 2001, Vol. 25> Issue(5) : 405-411

Skyrme-Hartree-Fock Description of the Nuclear Structure in Ca Isotopes (Ⅱ)Neutron Halo, Skin and Particles in the Classically Forbidden Area

Department of Technical Physics and Institute of Heavy Ion Physics, Peking University, Beijing 100871, China2. Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China3. Institute for Theoretical Physics, Chinese Academy of Science, Beijing 100080, China

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Abstract：
The pure-neutron matter together with the neutron skin or halo in Ca isotopes is studied using the Skyrme-Hartree-Fock model. It is shown that the pure-neutron-matter thickness depends not only on the Fermi levels of the neutrons, but also on the orbital angular momentum of the valence neutrons. A new definition for the thickness of pure-neutron-matter is proposed. Particles in classically forbidden area are also studied. The number of neutrons in the classically forbidden area increases with mass number A, because of the increase in the number of neutrons occupied in the weaklybound open shell. The number of protons in the classically forbidden area, in contrast, decreases with mass number A, because the orbits of protons become more deeply bound. It is shown that the number of particles in the classically forbidden area can give information on the appearance of the halo or skin.

References

[1]

Soojae Im,MENG Jie,ZHOU Shan Gui et al. High Energy Phys. and Nucl. Phys.,2001,25:322(任秀宰,孟杰,周善贵等.高能物理与核物理,2001,25:322)2 Skyrme T H R.Phil.Mag.,1956,1:1043;Nucl. Phys.,1959,9:6153 Beiner M,Flocard H,Giai N V et al.Nucl. Phys.,1975, A238:294 Reinhard P G,Computational Nuclear Physics I: Nuclear Structure, Editedby Langanke K,Maruhn J A,Koonin,S E Springer Verlag,Berlin,Heidelberg,1991,p285 Vautherin D,Brink D M.Phys.Rev.,1972,C5:626

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Soojae Im, MENG Jie, ZHOU Shan-Gui, YANG Si-Chun and LONG Wen-Hui. Skyrme-Hartree-Fock Description of the Nuclear Structure in Ca Isotopes (Ⅱ)Neutron Halo, Skin and Particles in the Classically Forbidden Area[J]. Chinese Physics C, 2001, 25(5): 405-411.

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Received: 2000-03-15
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Skyrme-Hartree-Fock Description of the Nuclear Structure in Ca Isotopes (Ⅱ)Neutron Halo, Skin and Particles in the Classically Forbidden Area

Corresponding author: MENG Jie,

Department of Technical Physics and Institute of Heavy Ion Physics, Peking University, Beijing 100871, China2. Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China3. Institute for Theoretical Physics, Chinese Academy of Science, Beijing 100080, China

Received Date: 2000-03-15
Accepted Date: 1900-01-01
Available Online: 2001-05-05

Abstract: The pure-neutron matter together with the neutron skin or halo in Ca isotopes is studied using the Skyrme-Hartree-Fock model. It is shown that the pure-neutron-matter thickness depends not only on the Fermi levels of the neutrons, but also on the orbital angular momentum of the valence neutrons. A new definition for the thickness of pure-neutron-matter is proposed. Particles in classically forbidden area are also studied. The number of neutrons in the classically forbidden area increases with mass number A, because of the increase in the number of neutrons occupied in the weaklybound open shell. The number of protons in the classically forbidden area, in contrast, decreases with mass number A, because the orbits of protons become more deeply bound. It is shown that the number of particles in the classically forbidden area can give information on the appearance of the halo or skin.