Nuclear Theory·nucl-th

Wednesday·March 11, 2020

20 papers—6 primary·14 cross-listed

01
[Submitted on 9 Mar 2020]
Resonant and Scattering States in the $α + α$ System from the Non-Localized Cluster Model
Dong Bai🇨🇳 · Zhongzhou Ren🇨🇳
The non-localized cluster model provides a new perspective on nuclear cluster effects and has been applied successfully to study cluster structures in various bound states and quasi-bound states (i.e., long-lived resonant states). In this work, we extend the application scope of the non-localized cluster model further to resonant and scattering states. Following the $R$ -matrix theory, the configuration space is divided into the interior and exterior regions by a large channel radius such that the nuclear forces and the antisymmetrization effects become negligible between clusters in the exterior region. In the interior region, the picture of non-localized clustering is realized mathematically by adopting the Brink-Tohsaki-Horiuchi-Schuck-Röpke (Brink-THSR) wave functions as the bases to construct the interior wave functions. The Bloch-Schrödinger equation is used to match the interior wave functions continuously with the asymptotic boundary conditions of the resonant and scattering states at the channel radius, which leads eventually to solutions of the problem. As a first test of the formalism, the low-lying resonant states of $^{8}$ Be and the phase shifts of the $α + α$ elastic scattering are studied. The numerical results agree well with the experimental data, which shows the validity of the theoretical framework.
Comments:
27 pages, 6 figures; accepted version
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2003.04313 [pdf]
PRC(2020)·15 citations
02
[Submitted on 9 Mar 2020]
Longitudinal eccentricity decorrelations in heavy ion collisions
Arabinda Behera🇺🇸 · Maowu Nie🇨🇳 · Jiangyong Jia🇺🇸
In heavy-ion collisions, the harmonic flow $V_{n}$ of final-state particles are driven by the eccentricity vector $E_{n}$ that describe the shape of the initial fireball projected in the transverse plane. It is realized recently that the structure and shape of the fireball, and consequently the $E_{n}$ , fluctuate in pseudorapidity $η$ in a single event, $E_{n} (η)$ . This leads to eccentricity decorrelation between different $η$ , driving the longitudinal flow decorrelations observed in the experiments. Using a Glauber model with a paramerterized longitudinal structure, we have estimated the eccentricity decorrelations and related them to the measured flow decorrelation coefficients for elliptic flow $n = 2$ and triangular flow $n = 3$ . We investigated the dependence of eccentricity decorrelations on the choice of collision system in terms of the size, asymmetry and deformation of the nuclei. We found that these nuclear geometry effects lead to significant and characteristic patterns on the eccentricity decorrelations, which describe the measured ratios of the flow decorrelations between Xe+Xe and Pb+Pb collisions. These patterns can be searched for using existing experimental data at RHIC and the LHC, and if confirmed, they will provide a mean to improve our understanding of the initial state of the heavy-ion collisions.
Comments:
7 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2003.04340 [pdf]
PRResearch(2020)·16 citations
03
[Submitted on 10 Mar 2020]
Short-range correlations effects on the deformability of neutron stars
Lucas A. Souza · Mariana Dutra · César H. Lenzi · Odilon Lourenço
In the present work, we investigate the effects of short-range correlations (SRC) on the dimensionless deformability of the binary neutron system related to the GW170817 event. We implemented phenomenological SRC in a relativistic mean-field model in which the bulk parameters, namely, incompressibility ( $K_{0}$ ), effective nucleon mass ratio ( $m^{*}$ ), symmetry energy ( $J$ ) and its slope ( $J_{0}$ ), are independently controlled. Our results point out that the SRC favor the model to pass through the constraints, established by the LIGO/Virgo Collaboration, on the values of $Λ_{1.4}$ and on the $Λ_{1} \times Λ_{2}$ region. We also found a clear linear correlation between $Λ_{1.4}$ with $K_{0}$ and $L_{0}$ (increasing dependence), and with $m^{*}$ and $J$ (decreasing dependence). Finally, we also obtained compatible numbers for $R_{1.4}$ (model with and without SRC) in comparison with recent data from the neutron star interior composition explorer mission.
Comments:
9 pages. 6 figures. It matches published version
Subjects:
Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
arXiv:
2003.04471 [pdf]
PRC(2020)·35 citations
04
[Submitted on 10 Mar 2020]
Few-body structures in the mirror nuclei, $^{11}$ O and $^{11}$ Li
E. Garrido · A.S. Jensen
We investigate the dripline mirror nuclei, $^{11}$ Li and $^{11}$ O, located on the neutron and proton dripline, respectively. We calculate the lowest four states, $3/ 2^{-}$ , $1/ 2^{+}$ , $3/ 2^{+}$ and $5/ 2^{+}$ , built on double occupancy in the nuclear $s_{1/2}$ and $p_{1/2}$ valence single-particle states. We use the hyperspherical adiabatic expansion method to solve the three-body problem for a frozen nuclear core surrounded by two identical nucleons. The four analogue states in $^{11}$ O are obtained with precisely the same interactions as used for the four states in $^{11}$ Li, except for addition of the Coulomb interaction from the charge of the substituted valence protons. Surprisingly the four energies deviate from each other only by less than a few hundred keV. Any of them could then turn out to be the ground state, due to the uncertainty related to the angular momentum and parity dependence of the three-body potential. Still, our calculations marginally favor the $1/ 2^{+}$ state. The structures of these four states in $^{11}$ O deviate substantially from the analogue states in the mirror, $^{11}$ Li.
Comments:
To be published in Physical Review C
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2003.04586 [pdf]
PRC(2020)·10 citations
05
[Submitted on 10 Mar 2020]
On survey of nuclei and hypernuclei in multifragmentation
N. Buyukcizmeci🇹🇷 · R. Ogul🇹🇷 · A.S. Botvina🇩🇪 · M. Bleicher🇩🇪
Multifragmentation reactions are dominating processes for the decomposition of highly excited nuclei leading to the fragment production in heavy-ion collisions. At high energy reactions strange particles are abundantly produced. We present a novel development of the Statistical multifragmentation model (SMM) as its generalization for the hyper-matter which is formed after the hyperon capture. In this way, it is possible to describe its disintegration into normal and hyper-nuclei. Some properties of hyper-nuclei and their binding energies can be determined from the comparison of the isotope yields. The main focus of this method is to investigate strange and multi-strange hypernuclei since their properties are not easy to measure in traditional hyper-nuclei experiments.
Comments:
13 pages, 7 figures, to be submitted Phys. Scr
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex)
arXiv:
2003.04801 [pdf]
Phys.Scripta(2020)·0 citations
06
[Submitted on 10 Mar 2020]
Calculating Fluctuations and Self-Correlations Numerically for Causal Charge Diffusion in Relativistic Heavy-Ion Collisions
Aritra De🇺🇸 · Christopher Plumberg🇸🇪 · Joseph I. Kapusta🇺🇸
We study the propagation and diffusion of electric charge fluctuations in the Bjorken hydrodynamic model with both white and Catteneo noise using purely numerical methods. We show that a global lattice of noise fluctuations is required to fully calculate the two-point correlators of charge. We solve the stochastic differential equations that arise from the charge conservation equation on the lattice. We explicitly identify the self-correlation term in the case of Catteneo noise and provide a physical interpretation. We provide a numerical recipe to remove this contribution from the full two-point correlators. Finally, we calculate the balance functions for charged hadrons. By limiting the speed of signal propagation, we observe the expected narrowing of the balance functions after removing the self-correlations.
Comments:
26 pages, 24 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2003.04878 [pdf]
PRC(2020)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE

Resonant and Scattering States in the α+α System from the Non-Localized Cluster Model

Longitudinal eccentricity decorrelations in heavy ion collisions

Short-range correlations effects on the deformability of neutron stars

Few-body structures in the mirror nuclei, 11O and 11Li

On survey of nuclei and hypernuclei in multifragmentation

Calculating Fluctuations and Self-Correlations Numerically for Causal Charge Diffusion in Relativistic Heavy-Ion Collisions

Affiliations

Resonant and Scattering States in the $α + α$ System from the Non-Localized Cluster Model

Few-body structures in the mirror nuclei, $^{11}$ O and $^{11}$ Li