Nuclear Theory·nucl-th

Tuesday·August 29, 2017

10 papers—6 primary·4 cross-listed

01
Computation of the Binding Energies in the Inverse Problem Framework
S.Cht. Mavrodiev · M.A. Deliyergiyev
We formalized the nuclear mass problem in the inverse problem framework. This approach allows us to infer the underlying model parameters from experimental observation, rather than to predict the observations from the model parameters. The inverse problem was formulated for the numericaly generalized the semi-empirical mass formula of Bethe and von Weizsäcker. It was solved in step by step way based on the AME2012 nuclear database. The solution of the overdetermined system of nonlinear equations has been obtained with the help of the Aleksandrov's auto-regularization method of Gauss-Newton type for ill-posed problems. In the obtained generalized model the corrections to the binding energy depend on nine proton (2, 8, 14, 20, 28, 50, 82, 108, 124) and ten neutron (2, 8, 14, 20, 28, 50, 82, 124, 152, 202) magic numbers as well on the asymptotic boundaries of their influence. These results help us to evaluate the borders of the nuclear landscape and show their limit. The efficiency of the applied approach was checked by comparing relevant results with the results obtained independently.
nucl-thExotic Nuclei, p.330-337 (2017)·0 citations
02
Scattering of decuplet baryons in chiral effective field theory
J. Haidenbauer🇩🇪 · S. Petschauer🇩🇪 · N. Kaiser🇩🇪 · Ulf-G. Meißner🇩🇪 · W. Weise🇩🇪
A formalism for treating the scattering of decuplet baryons in chiral effective field theory is developed. The minimal Lagrangian and potentials in leading-order SU(3) chiral effective field theory for the interactions of octet baryons ( $B$ ) and decuplet baryons ( $D$ ) for the transitions $B B \to B B$ , $B B \leftrightarrow D B$ , $D B \to D B$ , $B B \leftrightarrow D D$ , $D B \leftrightarrow D D$ , and $D D \to D D$ are provided. As an application of the formalism we compare with results from lattice QCD simulations for $ΩΩ$ and $N Ω$ scattering. Implications of our results pertinent to the quest for dibaryons are discussed.
nucl-thEPJC(2017)·42 citations
03
From Strangeness Enhancement to Quark-Gluon Plasma Discovery
Peter Koch🇩🇪 · Berndt Müller🇺🇸 · Johann Rafelski (Arizona)🇺🇸
This is a short survey of signatures and characteristics of the quark-gluon plasma in the light of experimental results that have been obtained over the past three decades. In particular, we present an in-depth discussion of the strangeness observable, including a chronology of the experimental effort to detect QGP at CERN-SPS, BNL-RHIC, and CERN-LHC.
nucl-thhep-phInt.J.Mod.Phys.A(2017)·61 citations
04
Freezeout systematics due to the hadron spectrum
Sandeep Chatterjee🇵🇱 · Debadeepti Mishra🇮🇳 · Bedangadas Mohanty🇮🇳 · Subhasis Samanta🇮🇳
We investigate systematics of the freezeout surface in heavy ion collisions due to the hadron spectrum. The role of suspected resonance states that are yet to be confirmed experimentally in identifying the freezeout surface has been investigated. We have studied two different freezeout schemes - unified freezeout scheme where all hadrons are assumed to freezeout at the same thermal state and a flavor dependent sequential freezeout scheme with different freezeout thermal states for hadrons with or without valence strange quarks. The data of mean hadron yields as well as scaled variance of net proton and net charge distributions have been analysed. We find the freezeout temperature $T$ to drop by $\sim 5%$ while the dimensionless freezeout parameters $μ_{B} / T$ and $V T^{3}$ ( $μ_{B}$ and $V$ are the baryon chemical potential and the volume at freezeout respectively) are insensitive to the systematics of the input hadron spectrum. The observed hint of flavor hierarchy in $T$ and $V T^{3}$ with only confirmed resonances survives the systematics of the hadron spectrum. It is more prominent between $s_{N N} \sim 10 - 100$ GeV where the maximum hierarchy in $T \sim 10%$ and $V T^{3} \sim 40%$ . However, the uncertainties in the thermal parameters due to the systematics of the hadron spectrum and their decay properties do not allow us to make a quantitative estimate of the flavor hierarchy yet.
nucl-thhep-lathep-phnucl-exPRC(2017)·39 citations
05
Alpha Clustering with a Hollow Structure --- Geometrical Structure of Alpha Clusters from Platonic Solids to Fullerene Shape
Akihiro Tohsaki · Naoyuki Itagaki
We study $α$ -cluster structure based on the geometric configurations with a microscopic framework, which takes full account of the Pauli principle, and which also employs an effective inter-nucleon force including finite-range three-body terms suitable for microscopic alpha-cluster models. Here, special attention is focused upon the $α$ clustering with a hollow structure; all the $α$ clusters are put on the surface of a sphere. All the Platonic solids (five regular polyhedra) and the fullerene-shaped polyhedron coming from icosahedral structure are considered. Furthermore, two configurations with dual polyhedra, hexahedron-octahedron and dodecahedron-icosahedron, are also scrutinized. As a consequence, we insist on the possible existence of stable $α$ -clustering with a hollow structure for all the configurations. Especially, two configurations, that is, dual polyhedra of dodecahedron-icosahedron and fullerene, have a prominent hollow structure compared with other six configurations.
nucl-thnucl-exPRC(2018)·4 citations
06
Contribution of Kaon component in viscosity and conductivity of hadronic medium
Mahfuzur Rahaman🇧🇷 · Snigdha Ghosh🇮🇳 · Sabyasachi Ghosh🇮🇳 · Sourav Sarkar🇮🇳 · Jan-e Alam🇮🇳
The two-point correlation functions of kaonic viscous stress tensors and electro-magnetic currents have been calculated respectively to estimate the contributions of the strange sector in the shear viscosity and electrical conductivity of hadronic medium. In the one-loop correlators, kaon propagators contain a non-zero thermal width that leads to non-divergent values of transport coefficients. With the help of effective Lagrangian densities of strange hadrons, we have calculated in-medium self-energy of kaon for different possible mesonic loops, whose imaginary part provide the estimation of kaon thermal width. It is observed that near the quark-hadron transition temperature, the contribution of kaons to shear viscosity is larger and increases faster with temperature than pionic contribution. In case of electrical conductivity the trend due kaon component appears to be opposite in nature with respect to pion component.
nucl-thhep-phPRC(2018)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

Computation of the Binding Energies in the Inverse Problem Framework

Scattering of decuplet baryons in chiral effective field theory

From Strangeness Enhancement to Quark-Gluon Plasma Discovery

Freezeout systematics due to the hadron spectrum

Alpha Clustering with a Hollow Structure --- Geometrical Structure of Alpha Clusters from Platonic Solids to Fullerene Shape

Contribution of Kaon component in viscosity and conductivity of hadronic medium

Affiliations