Background: Threenucleon forces (3NFs) have nontrivial implications on the evolution of correlations at extreme protonneutron asymmetries. Recent ab initio calculations show that leadingorder chiral interactions are crucial to obtain the correct binding energies and neutron driplines along the O, N, and F chains [A. Cipollone, C. Barbieri, and P. Navrátil, Phys. Rev. Lett. 111, 062501 (2013)PRLTAO0031900710.1103/PhysRevLett.111.062501]. Purpose: Here we discuss the impact of 3NFs along the oxygen chain for other quantities of interest, such has the spectral distribution for attachment and removal of a nucleon, spectroscopic factors, and radii. The objective is to better delineate the general effects of 3NFs on nuclear correlations. Methods: We employ selfconsistent Green's function (SCGF) theory which allows a comprehensive calculation of the singleparticle spectral function. For the closed subshell isotopes, O14, O16, O22, O24, and O28, we perform calculations with the DysonADC(3) method, which is fully nonperturbative and is the state of the art for both nuclear physics and quantum chemistry applications. The remaining openshell isotopes are studied using the newly developed GorkovSCGF formalism up to second order. Results: We produce complete plots for the spectral distributions. The spectroscopic factors for the dominant quasiparticle peaks are found to depend very little on the leadingorder (NNLO) chiral 3NFs. The latter have small impact on the calculated matter radii, which, however, are consistently obtained smaller than experiment. Similarly, singleparticle spectra tend to be too spread with respect to the experiment. This effect might hinder, to some extent, the onset of correlations and screen the quenching of calculated spectroscopic factors. The most important effect of 3NFs is thus the fine tuning of the energies for the dominant quasiparticle states, which governs the shell evolution and the position of driplines. Conclusions: Although present chiral NNLO 3NFs interactions do reproduce the binding energies correctly in this mass region, the details of the nuclear spectral function remain at odds with the experiment showing toosmall radii and a toospread singleparticle spectrum, similar to what has already been pointed out for larger masses. This suggests a lack of repulsion in the present model of NN+3N interactions, which is mildly apparent already for masses in the A=1428 mass range.
Chiral threenucleon forces and the evolution of correlations along the oxygen isotopic chain / A. Cipollone, C. Barbieri, P. Navratil.  In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS.  ISSN 05562813.  92:1(2015), pp. 014306.1014306.12. [10.1103/PhysRevC.92.014306]
Chiral threenucleon forces and the evolution of correlations along the oxygen isotopic chain
C. Barbieri;
2015
Abstract
Background: Threenucleon forces (3NFs) have nontrivial implications on the evolution of correlations at extreme protonneutron asymmetries. Recent ab initio calculations show that leadingorder chiral interactions are crucial to obtain the correct binding energies and neutron driplines along the O, N, and F chains [A. Cipollone, C. Barbieri, and P. Navrátil, Phys. Rev. Lett. 111, 062501 (2013)PRLTAO0031900710.1103/PhysRevLett.111.062501]. Purpose: Here we discuss the impact of 3NFs along the oxygen chain for other quantities of interest, such has the spectral distribution for attachment and removal of a nucleon, spectroscopic factors, and radii. The objective is to better delineate the general effects of 3NFs on nuclear correlations. Methods: We employ selfconsistent Green's function (SCGF) theory which allows a comprehensive calculation of the singleparticle spectral function. For the closed subshell isotopes, O14, O16, O22, O24, and O28, we perform calculations with the DysonADC(3) method, which is fully nonperturbative and is the state of the art for both nuclear physics and quantum chemistry applications. The remaining openshell isotopes are studied using the newly developed GorkovSCGF formalism up to second order. Results: We produce complete plots for the spectral distributions. The spectroscopic factors for the dominant quasiparticle peaks are found to depend very little on the leadingorder (NNLO) chiral 3NFs. The latter have small impact on the calculated matter radii, which, however, are consistently obtained smaller than experiment. Similarly, singleparticle spectra tend to be too spread with respect to the experiment. This effect might hinder, to some extent, the onset of correlations and screen the quenching of calculated spectroscopic factors. The most important effect of 3NFs is thus the fine tuning of the energies for the dominant quasiparticle states, which governs the shell evolution and the position of driplines. Conclusions: Although present chiral NNLO 3NFs interactions do reproduce the binding energies correctly in this mass region, the details of the nuclear spectral function remain at odds with the experiment showing toosmall radii and a toospread singleparticle spectrum, similar to what has already been pointed out for larger masses. This suggests a lack of repulsion in the present model of NN+3N interactions, which is mildly apparent already for masses in the A=1428 mass range.File  Dimensione  Formato  

PhysRevC_92_014306_2015.pdf
accesso aperto
Tipologia:
Publisher's version/PDF
Dimensione
5.09 MB
Formato
Adobe PDF

5.09 MB  Adobe PDF  Visualizza/Apri 
Oxygen_chains_3rdSub.pdf
accesso aperto
Tipologia:
Postprint, accepted manuscript ecc. (versione accettata dall'editore)
Dimensione
4.57 MB
Formato
Adobe PDF

4.57 MB  Adobe PDF  Visualizza/Apri 
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.