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Nuclear Theory·nucl-th

Friday·January 31, 2020

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    The QCD phase diagram and statistics friendly distributions

    Volker Koch🇺🇸 · Adam Bzdak🇵🇱 · Dmytro Oliinychenko🇺🇸 · Jan Steinheimer🇩🇪

    The preliminary STAR data for proton cumulants for central collisions at \sqrt{s}=7.7 GeV are consistent with a two-component proton multiplicity distribution. We show that this two-component distribution is statistics friendly in that factorial cumulants of surprisingly high orders may be extracted with a relatively small number of events. As a consequence the two-component model can be tested and verified right now with the presently available STAR data from the first phase of the RHIC beam energy scan.

    nucl-thNPA(2021)·5 citations
  2. 02

    Production of and correlation function in relativistic heavy-ion collisions

    Sylwia Bazak🇵🇱 · Stanislaw Mrowczynski🇵🇱

    The thermal and coalescence models both describe well yields of light nuclei produced in relativistic heavy-ion collisions at LHC. We propose to measure the yield of and compare it to that of to falsify one of the models. Since the masses of and are almost equal, the yield of is about 5 times bigger than that of in the thermal model because of different numbers of spin states of the two nuclides. Their internal structures are, however, very different: the alpha particle is well bound and compact while is weakly bound and loose. Consequently, the ratio of yields of to is significantly smaller in the coalescence model and it strongly depends on the collision centrality. Since the nuclide is unstable and it decays into and , the yield of can be experimentally obtained through a measurement of the correlation function. The function carries information not only about the yield of but also about the source of and allows one to determine through a source-size measurement whether of is directly emitted from the fireball or it is formed afterwards. We compute the correlation function taking into account the wave scattering and Coulomb repulsion together with the resonance interaction responsible for the nuclide. We discuss how to infer information about an origin of from the correlation function, and finally a method to obtain the yield of is proposed.

    nucl-thhep-phnucl-exEPJA(2020)·27 citations
  3. 03

    Angular distribution of fragments in neutron-induced nuclear fission at energies 1-200 MeV: data, theoretical models and relevant problems

    A. L. Barabanov · A. S. Vorobyev · A. M. Gagarski · O. A. Shcherbakov · L. A. Vaishnene

    In recent years, investigations of angular distributions of fragments in neutron-induced nuclear fission have been extended to intermediate energies, up to 200 MeV, as well as to a wide range of target isotopes. Using as an example the latest data obtained by our group for the reaction 237-Np(n,f), we discuss the specific features of fission fragment angular distribution and present a method for their simulation based on the code TALYS. It is shown that a simplified model reasonably describes energy dependence of the angular distribution in the whole range 1-200 MeV. The ways to improve the model are discussed along with the possibilities to use it for obtaining new information on fission and pre-equilibrium processes in neutron-nucleus interaction. We consider also the relevant problems of describing fission fragment angular distributions.

    nucl-thnucl-exEPJ Web Conf.(2021)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE