Isospin composition of the highmomentum fluctuations in nuclei from asymptotic momentum distributions
 Author
 Jan Ryckebusch (UGent) , Wim Cosyn (UGent) , Tom Vieijra (UGent) and Corneel Casert (UGent)
 Organization
 Abstract
 Background: Highmomentum nucleons in a nuclear environment can be associated with shortrange correlations (SRC) that primarily occur between nucleon pairs. Observations and theoretical developments have indicated that the SRC properties can be captured by general quantitative principles that are subject to model dependence upon quantification. The variations in the aggregated effect of SRC across nuclei, however, can be quantified in an approximately modelindependent fashion in terms of the socalled SRC scaling factors that capture the aggregated effect of SRC for a specific nucleus A relative to the deuteron (Atod). Purpose: We aim to provide predictions for the SRC scaling factors across the nuclear periodic table and determine the relative contribution of the different nucleon pair combinations to this quantity. We will also determine the SRC scaling factors for both bound protons and bound neutrons and study how these quantities evolve with the neutrontoproton (N/Z) ratio in asymmetric nuclei. Methods: We employ the loworder correlation operator approximation (LCA) to compute the SRC contribution to the singlenucleon momentum distribution and ratios of Atod momentum distributions. We do this for a sample of fifteen nuclei from He to Pb, thereby gaining access to the evolution of the SRC scaling factor with the nuclear mass 4 <= A <= 208 and the neutrontoproton ratio 1.0 <= N/Z <= 1.54. Results: We provide evidence for approximate Atod scaling of the singlenucleon momentum distribution at nucleon momenta exceeding about 4 fm(1). For the studied sample of fifteen nuclei, the total SRC scaling factor is in the range 4.055.14, of which roughly 3 can be attributed to protonneutron (pn) correlations. The SRC scaling factors receive sizable contributions from pp and nn correlations. They depend on the (N/Z) ratio reflecting the fact that the minority species (protons) becomes increasingly more shortrange correlated with increasing (N/Z). We compare the computed SRC scaling factors in the LCA with those of ab initio calculations and with measured quantities from SRCsensitive inclusive electronscattering data. Conclusions: It is shown that the LCA provides predictions for the SRC scaling factors across the nuclear table that are in line with measured values. In asymmetric nuclei there are sizable differences between the SRC scaling factors for protons and neutrons. It is suggested that this phenomenon may impact the variations of the magnitude of the European Muon Collaboration (EMC) effect across nuclei. Our results corroborate the finding that SRC physics can be qualitatively understood by universal principles that build on local modifications of meanfield wave functions of nucleon pairs.
 Keywords
 SHORTRANGE CORRELATIONS, GROUNDSTATE, DEPENDENCE, KNOCKOUT
Downloads

LCA a2 2019 revised.pdf
 full text
 
 open access
 
 
 893.31 KB
Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU8636548
 MLA
 Ryckebusch, Jan, et al. “Isospin Composition of the HighMomentum Fluctuations in Nuclei from Asymptotic Momentum Distributions.” PHYSICAL REVIEW C, vol. 100, no. 5, 2019, doi:10.1103/PhysRevC.100.054620.
 APA
 Ryckebusch, J., Cosyn, W., Vieijra, T., & Casert, C. (2019). Isospin composition of the highmomentum fluctuations in nuclei from asymptotic momentum distributions. PHYSICAL REVIEW C, 100(5). https://doi.org/10.1103/PhysRevC.100.054620
 Chicago authordate
 Ryckebusch, Jan, Wim Cosyn, Tom Vieijra, and Corneel Casert. 2019. “Isospin Composition of the HighMomentum Fluctuations in Nuclei from Asymptotic Momentum Distributions.” PHYSICAL REVIEW C 100 (5). https://doi.org/10.1103/PhysRevC.100.054620.
 Chicago authordate (all authors)
 Ryckebusch, Jan, Wim Cosyn, Tom Vieijra, and Corneel Casert. 2019. “Isospin Composition of the HighMomentum Fluctuations in Nuclei from Asymptotic Momentum Distributions.” PHYSICAL REVIEW C 100 (5). doi:10.1103/PhysRevC.100.054620.
 Vancouver
 1.Ryckebusch J, Cosyn W, Vieijra T, Casert C. Isospin composition of the highmomentum fluctuations in nuclei from asymptotic momentum distributions. PHYSICAL REVIEW C. 2019;100(5).
 IEEE
 [1]J. Ryckebusch, W. Cosyn, T. Vieijra, and C. Casert, “Isospin composition of the highmomentum fluctuations in nuclei from asymptotic momentum distributions,” PHYSICAL REVIEW C, vol. 100, no. 5, 2019.
@article{8636548, abstract = {{Background: Highmomentum nucleons in a nuclear environment can be associated with shortrange correlations (SRC) that primarily occur between nucleon pairs. Observations and theoretical developments have indicated that the SRC properties can be captured by general quantitative principles that are subject to model dependence upon quantification. The variations in the aggregated effect of SRC across nuclei, however, can be quantified in an approximately modelindependent fashion in terms of the socalled SRC scaling factors that capture the aggregated effect of SRC for a specific nucleus A relative to the deuteron (Atod). Purpose: We aim to provide predictions for the SRC scaling factors across the nuclear periodic table and determine the relative contribution of the different nucleon pair combinations to this quantity. We will also determine the SRC scaling factors for both bound protons and bound neutrons and study how these quantities evolve with the neutrontoproton (N/Z) ratio in asymmetric nuclei. Methods: We employ the loworder correlation operator approximation (LCA) to compute the SRC contribution to the singlenucleon momentum distribution and ratios of Atod momentum distributions. We do this for a sample of fifteen nuclei from He to Pb, thereby gaining access to the evolution of the SRC scaling factor with the nuclear mass 4 <= A <= 208 and the neutrontoproton ratio 1.0 <= N/Z <= 1.54. Results: We provide evidence for approximate Atod scaling of the singlenucleon momentum distribution at nucleon momenta exceeding about 4 fm(1). For the studied sample of fifteen nuclei, the total SRC scaling factor is in the range 4.055.14, of which roughly 3 can be attributed to protonneutron (pn) correlations. The SRC scaling factors receive sizable contributions from pp and nn correlations. They depend on the (N/Z) ratio reflecting the fact that the minority species (protons) becomes increasingly more shortrange correlated with increasing (N/Z). We compare the computed SRC scaling factors in the LCA with those of ab initio calculations and with measured quantities from SRCsensitive inclusive electronscattering data. Conclusions: It is shown that the LCA provides predictions for the SRC scaling factors across the nuclear table that are in line with measured values. In asymmetric nuclei there are sizable differences between the SRC scaling factors for protons and neutrons. It is suggested that this phenomenon may impact the variations of the magnitude of the European Muon Collaboration (EMC) effect across nuclei. Our results corroborate the finding that SRC physics can be qualitatively understood by universal principles that build on local modifications of meanfield wave functions of nucleon pairs.}}, articleno = {{054620}}, author = {{Ryckebusch, Jan and Cosyn, Wim and Vieijra, Tom and Casert, Corneel}}, issn = {{24699985}}, journal = {{PHYSICAL REVIEW C}}, keywords = {{SHORTRANGE CORRELATIONS,GROUNDSTATE,DEPENDENCE,KNOCKOUT}}, language = {{eng}}, number = {{5}}, pages = {{13}}, title = {{Isospin composition of the highmomentum fluctuations in nuclei from asymptotic momentum distributions}}, url = {{http://doi.org/10.1103/PhysRevC.100.054620}}, volume = {{100}}, year = {{2019}}, }
 Altmetric
 View in Altmetric
 Web of Science
 Times cited: