TY - JOUR

T1 - Pairing correlations and anti-halo effect in weakly bound nuclei

AU - Sagawa, Hiroyuki

AU - Hagino, Kouichi

PY - 2012

Y1 - 2012

N2 - We study the odd-even staggering (OES) in reaction cross sections of weakly bound nuclei with a Glauber theory, taking into account the pairing correlation in the Hartree- Fock-Bogoliubov (HFB) method. We show that the pairing gap persists in the limit of zero separation energy limit even for single particle orbits with the orbital angular momenta l = 0 and l = 1. We introduce the OES parameter defined as the second derivative of reaction cross sections with respect to the mass number, and clarify the relation between the magnitude of OES and the neutron separation energy. We find that the OES parameter increases considerably in the zero separation energy limit for l = 0 and l = 1 single-particle states, while no increase is found for higher angular momentum orbits with e.g., l = 3. We point out that the increase of OES parameter is also seen in the experimental reaction cross sections for Ne isotopes, which is well accounted for by our calculations.

AB - We study the odd-even staggering (OES) in reaction cross sections of weakly bound nuclei with a Glauber theory, taking into account the pairing correlation in the Hartree- Fock-Bogoliubov (HFB) method. We show that the pairing gap persists in the limit of zero separation energy limit even for single particle orbits with the orbital angular momenta l = 0 and l = 1. We introduce the OES parameter defined as the second derivative of reaction cross sections with respect to the mass number, and clarify the relation between the magnitude of OES and the neutron separation energy. We find that the OES parameter increases considerably in the zero separation energy limit for l = 0 and l = 1 single-particle states, while no increase is found for higher angular momentum orbits with e.g., l = 3. We point out that the increase of OES parameter is also seen in the experimental reaction cross sections for Ne isotopes, which is well accounted for by our calculations.

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U2 - 10.1143/PTPS.196.244

DO - 10.1143/PTPS.196.244

M3 - Article

AN - SCOPUS:84868229171

SP - 244

EP - 249

JO - Progress of Theoretical Physics Supplement

JF - Progress of Theoretical Physics Supplement

SN - 0375-9687

IS - 196

ER -