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Nuclear Theory·nucl-th

Monday·November 5, 2018

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 01

    Evolution of higher moments of multiplicity distribution

    Radka Sochorova🇨🇿 · Boris Tomasik🇸🇰

    Evolution of a multiplicity distribution can be described with the help of master equation. We first look at 3rd and 4th factorial moments of multiplicity distributions and derive their equilibrium values. From them central moments and other ratios can be calculated. We study the master equation for a fixed temperature, because we want to know how fast different moments of the multiplicity distribution approach their equilibrium value. Then we investigate the situation in which the temperature of the system decreases. We find out that in the non-equilibrium state, higher factorial moments differ more from their equilibrium values than the lower moments and that the behaviour of a combination of the central moments depends on the combination we choose.

    nucl-thhep-phnucl-exPoS(2019)·0 citations
  2. 02

    Kurtosis of elliptic flow fluctuations

    Rajeev S. Bhalerao🇮🇳 · Giuliano Giacalone🇫🇷 · Jean-Yves Ollitrault🇫🇷

    Elliptic flow () in ultrarelativistic nucleus-nucleus collisions fluctuates event to event, both in magnitude and in orientation with respect to the reaction plane. Even though the reaction plane is not known event to event in experiment, we show that the statistical properties of fluctuations in the reaction plane can be precisely extracted from experimental data. Previous studies have shown how to measure the mean, variance and skewness using the first three cumulants , and . We complement these studies by providing a formula for the kurtosis, which requires an accurate determination of the next cumulant . Using existing data, we show that the kurtosis is positive for most centralities, in contrast with the kurtosis of triangular flow fluctuations, which is negative. We argue that these features are robust predictions of fluid-dynamical models.

    nucl-thhep-phnucl-exPRC(2019)·24 citations
  3. 03

    Effect of a realistic three-body force on the spectra of medium-mass hypernuclei

    Petr Vesely🇨🇿 · Giovanni De Gregorio🇨🇿 · Jan Pokorny🇨🇿

    We adopt the Hartree-Fock (HF) method in the proton-neutron- (p-n-) formalism and the nucleon- Tamm-Dancoff Approximation (N TDA) to study the energy spectra of medium-mass hypernuclei. The formalism is developed for a potential derived from effective field theories which includes explicitly the 3-body forces plus the LO potential. The energy spectra of selected medium-mass hypernuclei are presented and their properties discussed. The present calculation is the first step of a project devoted to {\it ab initio} studies of hypernuclei in medium and heavy mass regions. This may provide a guide for a better understanding of the interactions at momentum scales not accessible in few-body hypernuclei.

    nucl-thPhys.Scripta(2019)·4 citations
  4. 04

    Singularities in Twist-3 Quark Distributions

    Fatma Aslan🇺🇸 · Matthias Burkardt🇺🇸

    We find in one-loop calculations and spectator models that twist-3 GPDs exhibit discontinuities. In the forward limit these discontinuities grow into Dirac delta functions which are essential to satisfy the sum rules involving twist-3 PDFs. We calculate twist-3 quasi-PDFs as a function of longitudinal momentum and identify the Dirac delta function terms with momentum components in the nucleon state that do not scale as the nucleon is boosted to the infinite momentum frame.

    nucl-thhep-phPRD(2020)·32 citations
  5. 05

    Anti-bubble effect of temperature \& deformation: a systematic study for nuclei across all mass regions between A 20300

    G. Saxena · M. Kumawat · Mamta Aggarwal

    Temperature dependent relativistic mean-field (RMF) plus BCS approach has been used for the first time to investigate the anti-bubble effect of the temperature and deformation in the light, medium-heavy and superheavy nuclei. Influence of temperature is studied on density distribution, charge form-factor, single particle (s.p.) energies, occupancy, deformation and the depletion fraction (DF). At T 0, the quenching effect of deformation is predominant. DF is found usually less in oblate deformation than in prolate. DF decreases with increasing prolate deformation even though the 2s-orbit is empty which shows the role of deformation in central depletion apart from the unoccupancy in s-orbit as is usually believed. As T increases, the occupancy of s-orbit increases, shell structure melts, the deformation vanishes and the weakening of central depletion is solely due to the temperature. The bubble effect is eliminated at T 35 MeV as indicated by DF and the charge form factor. The temperature effect is found less prominent in superheavy bubble nuclei where the role of shell effects is indicated.

    nucl-thnucl-exPLB(2019)·19 citations

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first authorsco-authorsvia INSPIRE