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Nuclear Theory·nucl-th

Monday·April 24, 2017

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    Spectroscopic factor and proton formation probability for the d3/2 proton emitter 151mLu

    F. Wang🇨🇳 · B. H. Sun🇨🇳 · Z. Liu🇨🇳 · R. D. Page🇬🇧 · C. Qi🇸🇪 · C. Scholey🇫🇮 · S. F. Ashley🇬🇧 · L. Bianco🇬🇧 · I. J. Cullen🇬🇧 · I. G. Darby🇺🇸 · S. Eeckhaudt🇫🇮 · A. B. Garnsworthy🇨🇦 and 33 other authors

    The quenching of the experimental spectroscopic factor for proton emission from the short-lived isomeric state in Lu was a long-standing problem. In the present work, proton emission from this isomer has been reinvestigated in an experiment at the Accelerator Laboratory of the University of Jyväskylä. The proton-decay energy and half-life of this isomer were measured to be 1295(5) keV and 15.4(8) s, respectively, in agreement with another recent study. These new experimental data can resolve the discrepancy in the spectroscopic factor calculated using the spherical WKB approximation. Using the R-matrix approach it is found that the proton formation probability indicates no significant hindrance for the proton decay of Lu.

    ↳ nucl-exnucl-thPLB(2017)·18 citations
  2. 08

    Crossover-model approach to QCD phase diagram, equation of state and susceptibilities in the 2+1 and 2+1+1 flavor systems

    Akihisa Miyahara🇯🇵 · Masahiro Ishii🇯🇵 · Hiroaki Kouno🇯🇵 · Masanobu Yahiro🇯🇵

    We construct a simple model for describing the hadron-quark crossover transition by using lattice QCD (LQCD) data in the 2+1 flavor system, and draw the phase diagram in the 2+1 and 2+1+1 flavor systems through analyses of the equation of state (EoS) and the susceptibilities. In the present hadron-quark crossover (HQC) model is successful in reproducing LQCD data on the EoS and the flavor susceptibilities.We define the hadron-quark transition temperature. For the 2+1 flavor system, the transition line thus obtained is almost identical in planes that are created by temperature and the chemical potential for the baryon-number(B), the isospin(I), the hypercharge(Y), when the chemical potentials are smaller than 250 MeV. This BIY approximate equivalence persists also in the 2+1+1 flavor system. We plot the phase diagram also in planes that are created by temperature and the chemical potential for u,d,s quark number in order to investigate flavor dependence of transition lines. In the 2+1+1 flavor system, c quark does not affect the 2+1 flavor subsystem composed of u, d, s. The flavor off-diagonal susceptibilities are good indicators to see how hadrons survive as T increases, since the independent quark model hardly contributes to them.

    ↳ hep-phhep-latnucl-thInt.J.Mod.Phys.A(2017)·6 citations
  3. 09

    Magnetic field influence on the early time dynamics of heavy-ion collisions

    Moritz Greif🇩🇪 · Carsten Greiner🇩🇪 · Zhe Xu🇨🇳

    In high energy heavy-ion collisions the magnetic field is very strong right after the nuclei penetrate each other and a non-equilibrium system of quarks and gluons builds up. Even though quarks might not be very abundant initially, their dynamics must necessarily be influenced by the Lorentz force. Employing the 3+1d partonic cascade BAMPS we show that the circular Larmor movement of the quarks leads to a strong positive anisotropic flow of quarks at very soft transverse momenta. We explore the regions where the effect is visible, and explicitly show how collisions damp the effect. As a possible application we look at photon production from the flowing non-equilibrium medium.

    ↳ hep-phnucl-thPRC(2017)·25 citations

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first authorsco-authorsvia INSPIRE