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Nuclear Theory·nucl-th

Friday·June 12, 2015

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    Forward-backward multiplicity fluctuation and longitudinal harmonics in high-energy nuclear collisions

    Jiangyong Jia🇺🇸 · Sooraj Radhakrishnan🇺🇸 · Mingliang Zhou🇺🇸

    An analysis method is proposed to study the forward-backward (FB) multiplicity fluctuation in high-energy nuclear collisions, built on the earlier work of Bzdak and Teaney. The method allows the decomposition of the centrality dependence of average multiplicity from the dynamical event-by-event (EbyE) fluctuation of multiplicity in pseudorapidity. Application of the method to AMPT and HIJING models shows that the long-range component of the FB correlation is captured by a few longitudinal harmonics, with the first component driven by the asymmetry in the number of participating nucleons in the two colliding nuclei. The higher-order longitudinal harmonics are found to be strongly damped in AMPT compare to HIJING, due to weaker short-range correlations as well as the final-state effects present in the AMPT model. Two-particle pseudorapidity correlation reveals interesting charge-dependent short-range structures that are absent in HIJING model. The proposed method opens an avenue to elucidate the particle production mechanism and early time dynamics in heavy-ion collisions. Future analysis directions and prospects of using the pseudorapidity correlation function to understand the centrality bias in +, +A and A+A collisions are discussed.

    nucl-thhep-phPRC(2016)·57 citations
  2. 02

    Ab initio alpha-alpha scattering

    Serdar Elhatisari🇩🇪 · Dean Lee🇺🇸 · Gautam Rupak🇺🇸 · Evgeny Epelbaum🇩🇪 · Hermann Krebs🇩🇪 · Timo A. Lähde🇩🇪 · Thomas Luu🇩🇪 · Ulf-G. Meißner🇩🇪

    Processes involving alpha particles and alpha-like nuclei comprise a major part of stellar nucleosynthesis and hypothesized mechanisms for thermonuclear supernovae. In an effort towards understanding alpha processes from first principles, we describe in this letter the first ab initio calculation of alpha-alpha scattering. We use lattice effective field theory to describe the low-energy interactions of nucleons and apply a technique called the adiabatic projection method to reduce the eight-body system to an effective two-cluster system. We find good agreement between lattice results and experimental phase shifts for S-wave and D-wave scattering. The computational scaling with particle number suggests that alpha processes involving heavier nuclei are also within reach in the near future.

    nucl-thcond-mat.quant-gashep-latnucl-exNature(2015)·197 citations
  3. 03

    Spectral statistics of rare-earth nuclei: Investigation of shell model configuration effect

    H. Sabri

    The spectral statistics of even-even rare-earth nuclei are investigated by using all the available empirical data for Ba, Ce, Nd, Sm, Gd, Dy, Er, Yb and Hf isotopes. The Berry- Robnik distribution and Maximum Likelihood estimation technique are used for analyses. An obvious deviation from GOE is observed for considered nuclei and there are some suggestions about the effect due to mass, deformation parameter and shell model configurations.

    nucl-thNPA(2015)·9 citations
  4. 04

    Charged-current quasielastic scattering of muon antineutrino and neutrino in the MINERvA experiment

    Artur M. Ankowski🇺🇸

    One of the largest sources of systematic uncertainties in ongoing neutrino-oscillation measurements is the description of nuclear effects. Its considerable reduction is expected thanks to the dedicated studies of (anti)neutrino-nucleus interactions in the MINERvA experiment. In this article, the calculations within the spectral function approach are compared to the charged-current quasielastic cross sections reported from MINERvA. The obtained results show that the effect of final-state interactions on the (anti)muon kinematics plays pivotal role in reproducing the experimental data.

    nucl-thhep-exhep-phPRD(2015)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE