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NUMBER-PROJECTED ELECTRIC QUADRUPOLE MOMENTS OF EVEN–EVEN PROTON-RICH NUCLEI IN THE ISOVECTOR PAIRING CASE

Laboratoire de Physique Théorique, Faculté de Physique, USTHB, BP 32, El Alia, 16111 Bab Ezzouar, Algiers, Algeria

Institut des Sciences et Technologie, Centre Universitaire de Khemis Miliana, Route de Theniet-El-Had, 44225, Khemis-Miliana, Algeria

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N. H. ALLAL

Laboratoire de Physique Théorique, Faculté de Physique, USTHB, BP 32, El Alia, 16111 Bab Ezzouar, Algiers, Algeria

Centre de Recherche Nucléaire d'Alger, 2 Bd. Frantz Fanon, BP. 399 Alger-Gare, Algiers, Algeria

Corresponding author.

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M. FELLAH

Laboratoire de Physique Théorique, Faculté de Physique, USTHB, BP 32, El Alia, 16111 Bab Ezzouar, Algiers, Algeria

Centre de Recherche Nucléaire d'Alger, 2 Bd. Frantz Fanon, BP. 399 Alger-Gare, Algiers, Algeria

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N. BENHAMOUDA

Laboratoire de Physique Théorique, Faculté de Physique, USTHB, BP 32, El Alia, 16111 Bab Ezzouar, Algiers, Algeria

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, and

M. R. OUDIH

Laboratoire de Physique Théorique, Faculté de Physique, USTHB, BP 32, El Alia, 16111 Bab Ezzouar, Algiers, Algeria

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https://doi.org/10.1142/S0218301313500298Cited by:8 (Source: Crossref)

Abstract

An expression of the number-projected electric quadrupole moment Q₂ has been established in the isovector pairing case using the SBCS discrete projection before variation method. It has been verified that this expression reduces to the pairing between like-particles one at the limit when the np pairing gap parameter Δ_np goes to zero. The convergence of the projection method has been numerically tested and a fast convergence has been observed. The electric quadrupole moment has been numerically calculated for some even–even proton-rich nuclei such as 16 ≤ Z ≤ 56 and 0 ≤ (N-Z) ≤ 4. The single-particle energies and eigen-states used are those of a Woods–Saxon mean-field. The np pairing effect on Q₂ has been studied either before and after the projection; it seems that it is somewhat small since the relative discrepancies do not exceed 12%. Moreover, the np pairing effect is roughly the same in both situations. However, it has been shown that this effect diminishes with increasing values of (N-Z). The projection effect on Q₂ has also been studied when including, or not, the np pairing correlations. It appears that this effect is slightly less important in the np pairing case than when only the pairing between like-particles is considered.

Keywords:

PACS: 21.60.-n, 21.10.Ky, 21.30.Fe

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