Difference between stable and exotic nuclei: medium polarization effects

Ricardo Americo Broglia; G. Potel; F. Barranco; E. Vigezzi

doi:10.1088/0954-3899/37/6/064022

Difference between stable and exotic nuclei: medium polarization effects

Ricardo Americo Broglia, G. Potel, F. Barranco, E. Vigezzi

9 Citations (Scopus)

Abstract

The ¹S₀ phase shift is large and positive at low densities (relative momenta), while it vanishes and eventually becomes negative at densities of the order of the saturation nuclear density. The bare NN-potential, parametrized so as to reproduce these phase shifts, leads to a sizable Cooper pair binding energy in nuclei along the stability valley. It is a much debated matter whether this value accounts for the 'empirical' value of the pairing gap or whether a similarly important contribution arises from the exchange of collective vibrations between Cooper pair partners. In keeping with the fact that two-particle transfer reactions are the specific probe of pairing in nuclei, and that exotic halo nuclei like ¹¹Li are extremely polarizable (representing, as far as this property is concerned, almost a caricature of stable nuclei), we find that the recently studied reaction, namely ¹¹Li+p → ⁹Li+t, provides, for the first time, direct evidence of phonon-mediated pairing in nuclei.

Original language	English
Journal	Journal of Physics G: Nuclear and Particle Physics
Volume	37
Issue number	6
Pages (from-to)	064022
ISSN	0954-3899
DOIs	https://doi.org/10.1088/0954-3899/37/6/064022
Publication status	Published - 9 Apr 2010

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title = "Difference between stable and exotic nuclei: medium polarization effects",

abstract = "The 1S0 phase shift is large and positive at low densities (relative momenta), while it vanishes and eventually becomes negative at densities of the order of the saturation nuclear density. The bare NN-potential, parametrized so as to reproduce these phase shifts, leads to a sizable Cooper pair binding energy in nuclei along the stability valley. It is a much debated matter whether this value accounts for the 'empirical' value of the pairing gap or whether a similarly important contribution arises from the exchange of collective vibrations between Cooper pair partners. In keeping with the fact that two-particle transfer reactions are the specific probe of pairing in nuclei, and that exotic halo nuclei like 11Li are extremely polarizable (representing, as far as this property is concerned, almost a caricature of stable nuclei), we find that the recently studied reaction, namely 11Li+p → 9Li+t, provides, for the first time, direct evidence of phonon-mediated pairing in nuclei.",

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TY - JOUR

T1 - Difference between stable and exotic nuclei

T2 - medium polarization effects

AU - Broglia, Ricardo Americo

AU - Potel, G.

AU - Barranco, F.

AU - Vigezzi, E.

PY - 2010/4/9

Y1 - 2010/4/9

N2 - The 1S0 phase shift is large and positive at low densities (relative momenta), while it vanishes and eventually becomes negative at densities of the order of the saturation nuclear density. The bare NN-potential, parametrized so as to reproduce these phase shifts, leads to a sizable Cooper pair binding energy in nuclei along the stability valley. It is a much debated matter whether this value accounts for the 'empirical' value of the pairing gap or whether a similarly important contribution arises from the exchange of collective vibrations between Cooper pair partners. In keeping with the fact that two-particle transfer reactions are the specific probe of pairing in nuclei, and that exotic halo nuclei like 11Li are extremely polarizable (representing, as far as this property is concerned, almost a caricature of stable nuclei), we find that the recently studied reaction, namely 11Li+p → 9Li+t, provides, for the first time, direct evidence of phonon-mediated pairing in nuclei.

AB - The 1S0 phase shift is large and positive at low densities (relative momenta), while it vanishes and eventually becomes negative at densities of the order of the saturation nuclear density. The bare NN-potential, parametrized so as to reproduce these phase shifts, leads to a sizable Cooper pair binding energy in nuclei along the stability valley. It is a much debated matter whether this value accounts for the 'empirical' value of the pairing gap or whether a similarly important contribution arises from the exchange of collective vibrations between Cooper pair partners. In keeping with the fact that two-particle transfer reactions are the specific probe of pairing in nuclei, and that exotic halo nuclei like 11Li are extremely polarizable (representing, as far as this property is concerned, almost a caricature of stable nuclei), we find that the recently studied reaction, namely 11Li+p → 9Li+t, provides, for the first time, direct evidence of phonon-mediated pairing in nuclei.

U2 - 10.1088/0954-3899/37/6/064022

DO - 10.1088/0954-3899/37/6/064022

M3 - Journal article

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SP - 064022

JO - Journal of Physics G: Nuclear and Particle Physics

JF - Journal of Physics G: Nuclear and Particle Physics

IS - 6

ER -

Difference between stable and exotic nuclei: medium polarization effects

Abstract

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