Quantitative properties of clustering within modern microscopic nuclear models
Abstract
A method for studying cluster spectroscopic properties of nuclear fragmentation, such as spectroscopic amplitudes, cluster form factors, and spectroscopic factors, is developed on the basis of modern precision nuclear models that take into account the mixing of largescale shellmodel configurations. Alphacluster channels are considered as an example. A mathematical proof of the need for taking into account the channelwavefunction renormalization generated by exchange terms of the antisymmetrization operator (Fliessbach effect) is given. Examples where this effect is confirmed by a high quality of the description of experimental data are presented. By and large, the method in question extends substantially the possibilities for studying clustering phenomena in nuclei and for improving the quality of their description.
 Authors:
 Florida State University (United States)
 Moscow State University, Skobelstsyn Institute of Nuclear Physics (Russian Federation)
 Publication Date:
 OSTI Identifier:
 22612613
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physics of Atomic Nuclei; Journal Volume: 79; Journal Issue: 5; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 74 ATOMIC AND MOLECULAR PHYSICS; ACCURACY; CONFIGURATION; EXPERIMENTAL DATA; FORM FACTORS; NUCLEAR FRAGMENTATION; NUCLEI; RENORMALIZATION; SHELL MODELS; SPECTROSCOPIC FACTORS; WAVE FUNCTIONS
Citation Formats
Volya, A., and Tchuvil’sky, Yu. M., Email: tchuvl@nuclth.sinp.msu.ru. Quantitative properties of clustering within modern microscopic nuclear models. United States: N. p., 2016.
Web. doi:10.1134/S1063778816040220.
Volya, A., & Tchuvil’sky, Yu. M., Email: tchuvl@nuclth.sinp.msu.ru. Quantitative properties of clustering within modern microscopic nuclear models. United States. doi:10.1134/S1063778816040220.
Volya, A., and Tchuvil’sky, Yu. M., Email: tchuvl@nuclth.sinp.msu.ru. 2016.
"Quantitative properties of clustering within modern microscopic nuclear models". United States.
doi:10.1134/S1063778816040220.
@article{osti_22612613,
title = {Quantitative properties of clustering within modern microscopic nuclear models},
author = {Volya, A. and Tchuvil’sky, Yu. M., Email: tchuvl@nuclth.sinp.msu.ru},
abstractNote = {A method for studying cluster spectroscopic properties of nuclear fragmentation, such as spectroscopic amplitudes, cluster form factors, and spectroscopic factors, is developed on the basis of modern precision nuclear models that take into account the mixing of largescale shellmodel configurations. Alphacluster channels are considered as an example. A mathematical proof of the need for taking into account the channelwavefunction renormalization generated by exchange terms of the antisymmetrization operator (Fliessbach effect) is given. Examples where this effect is confirmed by a high quality of the description of experimental data are presented. By and large, the method in question extends substantially the possibilities for studying clustering phenomena in nuclei and for improving the quality of their description.},
doi = {10.1134/S1063778816040220},
journal = {Physics of Atomic Nuclei},
number = 5,
volume = 79,
place = {United States},
year = 2016,
month = 9
}

Toward Understanding the Microscopic Origin of Nuclear Clustering
Open Quantum System (OQS) description of a manybody system involves interaction of Shell Model (SM) states through the particle continuum. In realistic nuclear applications, this interaction may lead to collective phenomena in the ensemble of SM states. We claim that the nuclear clustering is an emergent, nearthreshold phenomenon, which cannot be elucidated within the Closed Quantum System (CQS) framework. We approach this problem by investigating the nearthreshold behavior of Exceptional Points (EPs) in the realistic Continuum Shell Model (CSM). The consequences for the alphaclustering phenomenon are discussed. 
Angular clustering properties of gammaray bursts and quantitative constraints on their distances
Upper limits on the angular correlation function, w(theta), of gammaray bursts are obtained which constrain the sources to be very nearby or very distant. The angular clustering properties of the sources in two recent gammaray burst catalogs (Golenetskii et al., 1986 and Atteia et al., 1987) have been derived by determining their twopoint w(theta) values, and the correlations of both data sets are consistent with w(theta) = 0. It is shown that if the spatial correlation of gammaray bursts resembles that of galaxies or galactic clusters, present gammaray burst catalogs must be complete to distances in excess of 100 Mpc,more » 
Clustering properties of dynamical dark energy models
We provide a generic but physically clear discussion of the clustering properties of dark energy models. We explicitly show that in quintessencetype models the dark energy fluctuations, on scales smaller than the Hubble radius, are of the order of the perturbations to the Newtonian gravitational potential, hence necessarily small on cosmological scales. Moreover, comparable fluctuations are associated with different gauge choices. We also demonstrate that the often used homogeneous approximation is unrealistic, and that the socalled dark energy mutation is a trivial artifact of an effective, single fluid description. Finally, we discuss the particular case where the dark energy fluidmore » 
Improved microscopic nuclear level densities within the HartreeFockBogoliubov plus combinatorial method
New developments have been brought to our energy, spin, and paritydependent nuclear level densities based on the microscopic combinatorial model. As in our previous study, a detailed calculation of the intrinsic state density and of the rotational enhancement factor is included, but this time the vibrational contributions explicitly take the phonon excitations into account. The present model predicts the experimental s and pwave neutron resonance spacings with a degree of accuracy comparable to that of the best global models available. It is also shown that the model gives a reliable extrapolation at low energies where experimental data on the cumulativemore »