Continuum discretised BCS approach for weakly bound nuclei (English)

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In: Journal of Physics G: Nuclear and Particle Physics   ;  43 ,  8  ;  085103  ;  2016
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The Bardeen–Cooper–Schrieffer (BCS) formalism is extended by including the single-particle continuum in order to analyse the evolution of pairing in an isotopic chain from stability up to the drip-line. We propose a continuum discretised generalised BCS based on single-particle pseudostates (PS). These PS are generated from the diagonalisation of the single-particle Hamiltonian within a transformed harmonic oscillator basis. The consistency of the results versus the size of the basis is studied. The method is applied to neutron rich oxygen and carbon isotopes and compared with similar previous works and available experimental data. We make use of the flexibility of the proposed model in order to study the evolution of the occupation of the low-energy continuum when the system becomes weakly bound. We find an increasing influence of the non-resonant continuum as long as the Fermi level approaches the neutron separation threshold.

Table of contents – Volume 43, Issue 8

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084001
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084002
Shape coexistence at low spin in the Z = 50 region and its spectroscopic signatures
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Tagging b quarks at extreme energies without tracks
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085101
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085102
Fluctuations in charged particle multiplicities in relativistic heavy-ion collisions
Maitreyee Mukherjee / Sumit Basu / Subikash Choudhury / Tapan K Nayak | 2016
085103
Continuum discretised BCS approach for weakly bound nuclei
J A Lay / C E Alonso / L Fortunato / A Vitturi | 2016
085104
Electromagnetic selection rules in the triangular α-cluster model of 12C
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085201
Double electron capture searches in 74Se
B Lehnert / T Wester / D Degering / D Sommer / L Wagner / K Zuber | 2016