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Nuclear Theory·nucl-th

Wednesday·November 11, 2015

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 10 Nov 2015]

    Generator coordinate method for hypernuclear spectroscopy with a covariant density functional

    H. Mei🇯🇵 · K. Hagino🇯🇵 · J.M. Yao🇯🇵

    We apply the generator coordinate method (GCM) to single- hypernuclei in order to discuss the spectra of hypernuclear low-lying states. To this end, we use the same relativistic point-coupling energy functional both for the mean-field and the beyond-mean-field calculations. This relativistic GCM approach provides a unified description of low-lying states in ordinary nuclei and in hypernuclei, and is thus suitable for studying the impurity effect. We carry out an illustrative calculation for the low-lying spectrum of Ne, in which the interplay between the hypernuclear collective excitations and the single-particle excitations of the unpaired hyperon is taken into account in a full microscopic manner.

    Comments:
    5 pages, 3 eps figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1511.02957 [pdf]
    PRC(2016)·27 citations
  2. 02

    [Submitted on 10 Nov 2015]

    Magnetic moments in odd-A Cd isotopes and coupling of particles with zero-point vibrations

    S. Mishev · V. V. Voronov

    Background: The coupling of the last nucleon with configurations in the ground state of the even-even core is known to augment the single quasiparticle fragmentation pattern. In a recent experimental study by Yordanov \emph{et al.} the values of the magnetic dipole and electric quadrupole moments of the state in a long chain of Cd isotopes were found to follow a simple trend which we try to explain by means of incorporating long-range correlations in the ground state. Purpose: Our purpose is to study the influence of the ground-state correlations (GSC) on the magnetic moments and compare our results with the data for the odd-A Cd isotopes. Method: In order to evaluate if the additional correlations have bearing on the magnetic moments we employ an extension to the quasiparticle-phonon model (QPM) which takes into account quasiparticlephonon configurations in the ground state of the even-even core to the structure of the odd-A nucleus wave function. Results: It is shown that the values for the magnetic moments which the applied QPM extension yields deviate further from the Schmidt values. The latter is in agreement with the measured values for the Cd isotopes. Conclusions: The GSC exert significant influence on the magnetic dipole moments and reveal a potential for reproducing the experimental values for the studied cadmium isotopes.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1511.03013 [pdf]
    PRC(2015)·7 citations
  3. 03

    [Submitted on 10 Nov 2015]

    Electromagnetic recombination spectra at the quark-hadron phase transition

    Clint Young🇺🇸 · Scott Pratt🇺🇸

    When quarks hadronize, they accelerate. Because they carry electric charge, they must radiate light as they accelerate and hadronize. This is true not only in jets but also in heavy ion collisions, where a thermalized plasma of quarks and gluons cools into a gas of hadrons. First, direct emission of photons from two quarks coalescing into pions is calculated using the quark-meson model. The yield of final-state photons to pions is found to be about , which is on the order of a percent. Second, the yield of photons from the decay of highly excited color singlets, which may exist ephemerally during hadronizaton, is estimated. Because these contributions occur late in the reaction, they should carry significant elliptic flow, which may help explain the large observed flow of direct photons at RHIC by the PHENIX Collaboration at the Relativistic Heavy Ion Collider (RHIC). The enhanced emission also helps explain PHENIX's surprisingly large observed ratio.

    Comments:
    18 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1511.03147 [pdf]
    PRC(2016)·7 citations
  4. 04

    [Submitted on 10 Nov 2015]

    Numerical assessment of post-prior equivalence for inclusive breakup reactions

    Jin Lei🇪🇸 · Antonio M. Moro🇪🇸

    We address the problem of the post-prior equivalence in inclusive breakup reactions induced by weakly-bound nuclei. The problem is studied within the DWBA model of Ichimura, Austern, Vincent [Phys. Rev. C32, 431 (1985)]. The post and prior formulas obtained in this model are briefly recalled, and applied to several breakup reactions induced by deuterons and Li projectiles, to test their actual numerical equivalence. The different contributions of the prior-form formula are also discussed. A critical comparison with the prior-form distorted-wave Born approximation (DWBA) model of Udagawa and Tamura [Phys. Rev. C24, 1348 (1981)] is also provided.

    Comments:
    6 pages, 2 figures, submitted to PRC
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1511.03214 [pdf]
    PRC(2015)·55 citations

Affiliations

first authorsco-authorsvia INSPIRE