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Nuclear Theory·nucl-th

Friday·May 3, 2019

11 papers—4 primary·7 cross-listed

All11Primary4Cross-lists7
  1. 01

    [Submitted on 2 May 2019]

    Neutrino-induced single-pion production: Kinematics and Cross Section

    Raúl González-Jiménez

    In the energy range of present and future accelerator-based neutrino-oscillation experiments, single-pion production (SPP) is one of the main contributions to the neutrino-nucleus scattering cross section. For these neutrino energies, ranging from several hundreds of MeV to a few GeV, the SPP on the nucleus is usually described by the reaction in which the incoming lepton couples to one bound nucleon in the nucleus, producing a pion and the knock-out nucleon, along with the residual system and the scattered lepton in the final state. Here, the kinematics and cross section formula for this process are discussed, although the formalism can be applied to other processes.

    Comments:
    Proceedings of the 20th International Workshop on Neutrinos (NuFACT18), 12-18 August 2018 Blacksburg, Virginia, USA
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1905.00535 [pdf]
    PoS(2019)·4 citations
  2. 02

    [Submitted on 2 May 2019]

    Net-proton number fluctuations in the presence of the QCD critical point

    Michał Szymański🇵🇱 · Marcus Bluhm🇵🇱 · Krzysztof Redlich🇵🇱 · Chihiro Sasaki🇵🇱

    Event-by-event fluctuations of the net-proton number studied in heavy-ion collisions provide an important means in the search for the conjectured critical end point (CP) in the QCD phase diagram. We propose a phenomenological model in which the fluctuations of the chiral critical mode couple to protons and anti-protons. This allows us to study the behavior of the net-proton number fluctuations in the presence of the CP. Calculating the net-proton number cumulants, with n=1,2,3,4, along the phenomenological freeze-out line we show that the ratio of variance and mean , as well as kurtosis resemble qualitative properties observed in data in heavy-ion collisions as a function of beam energy obtained by the STAR Collaboration at RHIC. In particular, the non-monotonic structure of the kurtosis and smooth change of the ratio with beam energy could be due to the CP located near the freeze-out line. The skewness, however, exhibits properties that are in contrast to the criticality expected due to the CP. The dependence of our results on the model parameters and the proximity of the chemical freeze-out to the critical point are also discussed.

    Comments:
    19 pages, 5 figures. Version accepted for publication in Journal of Physics G: Nuclear and Particle Physics
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1905.00667 [pdf]
    J.Phys.G(2020)·12 citations
  3. 03

    [Submitted on 2 May 2019]

    Electromagnetic properties of the hexaquark

    M. Bashkanov🇬🇧 · D.P. Watts🇬🇧 · A. Pastore🇬🇧

    Experiments with intense photon and electron beams have the potential to provide access to nontrivial properties of the recently discovered hexaquark including its size, structure, magnetic moment, quadrupole and octupole deformations. In this paper we investigate the sensitivity of ongoing and planned experiments to various properties of the , employing models based on both constituent quark and pion cloud frameworks. Our calculations indicate that for photoinduced reactions on the deuteron the is predominantly produced from the component of the deuteron. We confirm earlier findings that the intrinsic quadrupole deformation of the should be small. We also demonstrate an ability to extract the magnetic moment and put constrains on the ratio.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1905.00713 [pdf]
    PRC(2019)·11 citations
  4. 04

    [Submitted on 2 May 2019]

    Nonlocalized Clustering and Evolution of Cluster Structure in Nuclei

    Bo Zhou · Yasuro Funaki · Hisashi Horiuchi · Akihiro Tohsaki

    We explain various facets of the THSR (Tohsaki-Horiuchi-Schuck-Röpke) wave function. We first discuss the THSR wave function as a wave function of cluster-gas state, since the THSR wave function was originally introduced to elucidate the 3-condensate-like character of the Hoyle state ( state) of C. We briefly review the cluster-model studies of the Hoyle state in 1970's in order to explain how there emerged the idea to assign the condensate character to the Hoyle state. We then explain that the THSR wave function can describe very well also non-gaslike ordinary cluster states with spatial localization of clusters. This fact means that the dynamical motion of clusters is of nonlocalized nature just as in gas-like states of clusters and the localization of clusters is due to the inter-cluster Pauli principle which is against the close approach of two clusters. The nonlocalized cluster dynamics is formulated by the container model of cluster dynamics. The container model describes gas-like state and non-gaslike states as the solutions of the Hill-Wheeler equation with respect to the size parameter of THSR wave function which is just the size parameter of the container. When we notice that fact that the THSR wave function with the smallest value of size parameter is equivalent to the shell-model wave function, we see that the container model describes the evolution of cluster structure from the ground state with shell-model structure up to the gas-like cluster state via ordinary non-gaslike cluster states. For the description of various cluster structure, more generation of THSR wave function have been introduced and we review some typical examples with their actual applications.

    Comments:
    71 pages, 54 figures, review paper
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1905.00788 [pdf]
    Front.Phys.(Beijing)(2020)·36 citations

Affiliations

first authorsco-authorsvia INSPIRE