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Nuclear Theory·nucl-th

Wednesday·October 21, 2015

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    [Submitted on 19 Oct 2015]

    EFT studies of few-nucleon systems: a status report

    R. Schiavilla🇺🇸

    A status report on EFT studies of few-nucleon electroweak structure and dynamics is provided, including electromagnetic form factors of few-nucleon systems, the weak fusion and muon weak captures on deuteron and He, and a number of parity-violating processes induced by hadronic weak interactions.

    Comments:
    12 pages, 8 figures, proceedings of 8th Workshop on Chiral Dynamics, Pisa, Italy
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.05689 [pdf]
    PoS(2015)·0 citations
  2. 02

    [Submitted on 20 Oct 2015]

    Physics perspectives of heavy-ion collisions at very high energy

    Ning-bo Chang (CCNU)🇨🇳 · Shanshan Cao (LBNL)🇺🇸 · Bao-yi Chen (Tsinghua U)🇨🇳 · Shi-yong Chen (CCNU)🇨🇳 · Zhen-yu Chen (Tsinghua U)🇨🇳 · Heng-Tong Ding (CCNU)🇨🇳 · Min He (NUSTC)🇨🇳 · Zhi-quan Liu (CCNU)🇨🇳 · Long-gang Pang (CCNU)🇨🇳 · Guang-you Qin (CCNU)🇨🇳 · Ralf Rapp (TAMU)🇺🇸 · Björn Schenke (BNL)🇺🇸 and 9 other authors

    Heavy-ion collisions at very high colliding energies are expected to produce a quark-gluon plasma (QGP) at the highest temperature obtainable in a laboratory setting. Experimental studies of these reactions can provide an unprecedented range of information on properties of the QGP at high temperatures. We report theoretical investigations of the physics perspectives of heavy-ion collisions at a future high-energy collider. These include initial parton production, collective expansion of the dense medium, jet quenching, heavy-quark transport, dissociation and regeneration of quarkonia, photon and dilepton production. We illustrate the potential of future experimental studies of the initial particle production and formation of QGP at the highest temperature to provide constraints on properties of strongly interaction matter.

    Comments:
    35 pages in Latex, 29 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1510.05754 [pdf]
    SCPMA(2016)·24 citations
  3. 03

    [Submitted on 15 Oct 2015]

    A parameterized model for Coulomb barrier height

    Deepak Kumar Swami · Prashant Sharma · Tapan Nandi

    Coulomb barrier height is a basic parameter to describing the nuclear reactions. Recently it is found that ions produce from nuclear reactions can be used to study electron loss and capture processes. Hence determining the Coulomb barrier becomes important in both nuclear and atomic physics. The different models depend on the nucleus-nucleus potential chosen or parameters used to calculate the barrier heights. In this work we plan to develop a parameterized formula from experimental results obtained from quasi elastic scattering. Since quasi elastic data spread over Z1Z2=64 to Z1Z2=2460, the formula is expected to work in the range of low Z1Z2 to high Z1Z2, where Z1, Z2 are the atomic number of the projectile and the target, respectively.

    Comments:
    2 Pages, 2 Figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.05919 [pdf]
    0 citations
  4. 04

    [Submitted on 20 Oct 2015]

    Theoretical Optical Potential Derived From Nucleon-Nucleon Chiral Potentials

    M. Vorabbi · P. Finelli · C. Giusti

    Background: Elastic scattering is probably the main event in the interactions of nucleons with nuclei. Even if this process has been extensively studied in the last years, a consistent description, i.e. starting from microscopic two- and many-body forces connected by the same symmetries and principles, is still under development. Purpose: In this work we study the domain of applicability of microscopic two-body chiral potentials in the construction of an optical potential. Methods: We basically follow the KMT approach to build a microscopic complex optical potential and then we perform some test calculations on 16O at different energies. Results: Our conclusion is that a particular set of potentials with a Lippmann-Schwinger cutoff at relatively high energies (above 500 MeV) has the best performances reproducing the scattering observables. Conclusions: Our work shows that building an optical potential within Chiral Perturbation Theory is a promising approach to the description of elastic proton scattering, in particular, in view of the future inclusion of many-body forces that naturally arise in such framework.

    Comments:
    15 pages and 12 figures. Accepted version (Physical Review C) with major changes in Sect. III and IV and new figures (5,10,11,12)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.05928 [pdf]
    PRC(2016)·47 citations
  5. 05

    [Submitted on 20 Oct 2015]

    Spin-polarized neutron matter: Critical unpairing and BCS-BEC precursor

    Martin Stein · Armen Sedrakian · Xu-Guang Huang · John W. Clark

    We obtain the critical magnetic field required for complete destruction of -wave pairing in neutron matter, thereby setting limits on the pairing and superfluidity of neutrons in the crust and outer core of magnetars. We find that for fields G the neutron fluid is non-superfluid -- if weaker spin-1 superfluidity does not intervene -- a result with profound consequences for the thermal, rotational, and oscillatory behavior of magnetars. Because the dineutron is not bound in vacuum, cold dilute neutron matter cannot exhibit a proper BCS-BEC crossover. Nevertheless, owing to the strongly resonant behavior of the interaction at low densities, neutron matter shows a precursor of the BEC state, as manifested in Cooper-pair correlation lengths {being} comparable to the interparticle distance. We make a systematic quantitative study of this type of BCS-BEC crossover in the presence of neutron fluid spin-polarization induced by an ultra-strong magnetic field. We evaluate the Cooper pair wave-function, quasiparticle occupation numbers, and quasiparticle spectra for densities and temperatures spanning the BCS-BEC crossover region. The phase diagram of spin-polarized neutron matter is constructed and explored at different polarizations.

    Comments:
    13 RevTex pages, 18 figures, v2: minor changes, references added, matches published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    1510.06000 [pdf]
    PRC(2016)·41 citations
  6. 06

    [Submitted on 20 Oct 2015]

    The black hole spin influence on accretion disk neutrino detection

    O. L. Caballero🇨🇦 · T. Zielinski🇨🇦 · G. C. McLaughlin🇺🇸 · R. Surman🇺🇸

    Neutrinos are copiously emitted from black hole accretion disks playing a fundamental role in their evolution, as well as in the production of gamma ray bursts and r-process nucleosynthesis. The black hole generates a strong gravitational field able to change the properties of the emerging neutrinos. We study the influence of the black hole spin on the structure of the neutrino surfaces, neutrino luminosities, average neutrino energies, and event counts at SuperK. We consider several disk models and provide estimates that cover different black hole efficiency scenarios. We discuss the influence of the detector's inclination with respect to the axis of the torus on neutrino properties. We find that tori around spinning black holes have larger luminosities, energies and rates compared to tori around static black holes, and that the inclination of the observer causes a reduction in the luminosities and detection rates but an increase in the average energies.

    Comments:
    10 pages, 5 figures, submitted to PRD
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    1510.06011 [pdf]
    PRD(2016)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE