COUPLING EFFECTS IN THE EXTRACTION OF SPECTROSCOPIC FACTORS

Direct nuclear reactions are used to extract spectroscopic information about exotic nuclei. A spectroscopic factor (SF) is often extracted from measurements assuming a single-particle structure for the projectile. Being peripheral, these reactions are mostly sensitive to the asymptotic normalization coefficient (ANC) of the wave function. We study the accuracy of analysing peripheral reactions with a single-particle approximation of the nucleus. We consider a collective core+n model, in which the core can be excited. Fair agreement is obtained between the SF inferred from the single-particle approximation and the one obtained within the collective model when large SFs are concerned.

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Single-particle states in non-local potentials and direct nuclear reactions

Nuclear Physics A ◽

10.1016/0375-9474(67)90653-7 ◽

1967 ◽

Vol 101 (3) ◽

pp. 577-588 ◽

Cited By ~ 15

Author(s):

H. Schulz ◽

J. Wiebicke ◽

R. Reif

Keyword(s):

Single Particle ◽

Nuclear Reactions ◽

Non Local ◽

Local Potentials ◽

Direct Nuclear Reactions

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A Study of the (d,p) Reaction on 62Ni near the Coulomb Barrier

Canadian Journal of Physics ◽

10.1139/p72-279 ◽

1972 ◽

Vol 50 (18) ◽

pp. 2096-2099 ◽

Cited By ~ 4

Author(s):

D. Sykes ◽

K. Ramavataram ◽

G. F. Mercier ◽

C. St-Pierre ◽

C. S. Yang

Keyword(s):

Cross Sections ◽

Differential Cross ◽

Single Particle ◽

Coulomb Barrier ◽

Spectroscopic Factor ◽

Differential Cross Sections ◽

Absolute Differential ◽

Particle Strength ◽

Spectroscopic Factors ◽

The Absolute

The absolute differential cross sections for the 62Ni(d,p)63Ni reaction have been measured at deuteron bombarding energies of 4.45 and 5.12 MeV. Spectroscopic factors were obtained and the results are discussed in terms of the DWBA model of stripping reactions. It is found that this technique leads to reliable and stable values of the spectroscopic factor even for states which carry less than half the single particle strength.

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Crystallization of the inner crust of a neutron star and the influence of shell effects

Astronomy and Astrophysics ◽

10.1051/0004-6361/201937236 ◽

2020 ◽

Vol 635 ◽

pp. A84 ◽

Cited By ~ 4

Author(s):

T. Carreau ◽

F. Gulminelli ◽

N. Chamel ◽

A. F. Fantina ◽

J. M. Pearson

Keyword(s):

Neutron Star ◽

Finite Temperature ◽

Nuclear Reactions ◽

Compressible Liquid ◽

Quantitative Prediction ◽

Particle Structure ◽

Shell Effects ◽

Component Plasma ◽

The One ◽

Outer Crust

Context. In the cooling process of a non-accreting neutron star, the composition and properties of the crust are thought to be fixed at the finite temperature where nuclear reactions fall out of equilibrium. A lower estimate for this temperature is given by the crystallization temperature, which can be as high as ≈7 × 109 K in the inner crust, potentially leading to sizeable differences with respect to the simplifying cold-catalyzed matter hypothesis. Aims. We extend a recent work on the outer crust to the study of the crystallization of the inner crust and the associated composition in the one-component plasma approximation. Methods. The finite temperature variational equations for non-uniform matter in both the liquid and the solid phases are solved using a compressible liquid-drop approach with parameters optimized on four different microscopic models that cover current uncertainties in nuclear modeling. Results. We consider the effect of the different nuclear ingredients with their associated uncertainties separately: the nuclear equation of state, the surface properties in the presence of a uniform gas of dripped neutrons, and the proton shell effects arising from the ion single-particle structure. Our results suggest that the highest source of model dependence comes from the smooth part of the nuclear functional. Conclusions. We show that shell effects play an important role at the lowest densities close to the outer crust, but the most important physical ingredient to be settled for a quantitative prediction of the inner crust properties is the surface tension at extreme isospin values.

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