Date: Mon, 29 Jun 15 00:17:21 GMT Subject: nucl-th daily 6 new + 2 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: nucl-th@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Thu 25 Jun 15 20:00:00 GMT to Fri 26 Jun 15 20:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1506.07883 Date: Thu, 25 Jun 2015 20:02:00 GMT (12kb) Title: Electromagnetic modulation of monochromatic neutrino beams Authors: A. L. Barabanov, O. A. Titov Categories: nucl-th hep-ph nucl-ex Comments: 11 pages, 1 figure \\ A possibility to produce a modulated monochromatic neutrino beam is discussed. Monochromatic neutrinos can be obtained in electron capture by nuclei of atoms or ions, in particular, by nuclei of hydrogen-like ions. It is shown that monochromatic neutrino beam from such hydrogen-like ions with nuclei of non-zero spin can be modulated because of different probabilities of electron capture from hyperfine states. Modulation arises by means of inducing of electromagnetic transitions between the hyperfine states. Requirements for the hydrogen-like ions with necessary properties are discussed. A list of the appropriate nuclei for such ions is presented. \\ ( http://arxiv.org/abs/1506.07883 , 12kb) ------------------------------------------------------------------------------ \\ arXiv:1506.07954 Date: Fri, 26 Jun 2015 04:15:42 GMT (404kb) Title: 8li(n,g)9li reaction at superlow energies Authors: S. B. Dubovichenko, A. V. Dzhazairov-Kakhramanov Categories: nucl-th Comments: 19p., 1 tabl., 5 fig Report-no: APHI-2015-2 \\ Within the framework of the modified potential cluster model with the state classification of nuclear particles according to Young tableaux the possibility of describing the available experimental data for the total cross sections of the neutron radiative capture on 8Li at thermal and astrophysical energies was considered. \\ ( http://arxiv.org/abs/1506.07954 , 404kb) ------------------------------------------------------------------------------ \\ arXiv:1506.07963 Date: Fri, 26 Jun 2015 06:19:16 GMT (125kb) Title: A Universal Damping Mechanism of Quantum Vibrations in Deep Sub-Barrier Fusion Reactions Authors: Takatoshi Ichikawa and Kenichi Matsuyanagi Categories: nucl-th Comments: 4 pages, 4 figures \\ We demonstrate the damping of quantum octupole vibrations near the touching point when two colliding nuclei approach each other in the mass-asymmetric $^{208}$Pb + $^{16}$O system, for which the strong fusion hindrance was clearly observed. We, for the first time, apply the random-phase approximation method to the heavy-mass asymmetric di-nuclear system to calculate the transition strength $B$(E3) as a function of the center-of-mass distance. The obtained $B$(E3) strengths are substantially damped near the touching point, because the single-particle wave functions of the two nuclei strongly mix with each other and a neck is formed. The energy-weighted sums of $B$(E3) are also strongly correlated with the damping factor which is phenomenologically introduced in the standard coupled-channel calculations to reproduce the fusion hindrance. This strongly indicates that the damping of the quantum vibrations universally occurs in the deep sub-barrier fusion reactions. \\ ( http://arxiv.org/abs/1506.07963 , 125kb) ------------------------------------------------------------------------------ \\ arXiv:1506.08005 Date: Fri, 26 Jun 2015 09:16:49 GMT (26kb) Title: Improved parametrization of the unified model for alpha decay and alpha capture Authors: V. Yu. Denisov, O. I. Davidovskaya, I. Yu. Sedykh Categories: nucl-th Comments: 7 pages, 1 figure. arXiv admin note: text overlap with arXiv:0902.0677 \\ The updated data for the ground-state-to-ground-state alpha-transition half-lives in 401 nuclei and the alpha capture cross sections of 40Ca, 44Ca, 59Co, 208Pb and 209Bi are well described in the framework of the unified model for alpha-decay and alpha-capture. The updated values of the alpha decay half-lives, the binding energies of nuclei, the spins of parent and daughter nuclei, and the surface deformation parameters are used for the reevaluation of the model parameters. The data for the ground-state-to-ground-state alpha-decay half-lives are also well described by the empirical relationships. \\ ( http://arxiv.org/abs/1506.08005 , 26kb) ------------------------------------------------------------------------------ \\ arXiv:1506.08037 Date: Fri, 26 Jun 2015 11:49:55 GMT (237kb) Title: Probing the neutron-skin thickness by photon production from reactions induced by intermediate-energy protons Authors: Gao-Feng Wei Categories: nucl-th Comments: Accepted version for publication. To appear in Physical Review C \\ Photon from neutron-proton bremsstrahlung in p+Pb reactions is examined as a potential probe of the neutron-skin thickness in different centralities and at different proton incident energies. It is shown that the best choice of reaction environment is about 140MeV for the incident proton and the 95\%-100\% centrality for the reaction system since the incident proton mainly interacts with neutrons inside the skin of the target and thus leads to different photon production to maximal extent. Moreover, considering two main uncertainties from both photon production probability and nucleon-nucleon cross section in the reaction, I propose to use the ratio of photon production from two reactions to measure the neutron-skin thickness because of its cancellation effects on these uncertainties simultaneously, but the preserved about 13\%-15\% sensitivities on the varied neutron-skin thickness from 0.1 to 0.3fm within the current experimental uncertainty range of the neutron-skin size in $^{208}$Pb. \\ ( http://arxiv.org/abs/1506.08037 , 237kb) ------------------------------------------------------------------------------ \\ arXiv:1506.08120 Date: Fri, 26 Jun 2015 15:36:08 GMT (36kb) Title: Origin of the structures observed in $e^+e^-$ annihilation into multipion states around the $\bar pp$ threshold Authors: Johann Haidenbauer, Christoph Hanhart, Xian-Wei Kang, Ulf-G. Mei{\ss}ner Categories: nucl-th Comments: 7 pages, 4 figures \\ We analyze the origin of the structures observed in the reactions $e^+e^-\to 3(\pi^+\pi^-)$, $2(\pi^+\pi^-\pi^0)$, $\omega\pi^+\pi^-\pi^0$, and $e^+e^-\to 2(\pi^+\pi^-)\pi^0$ around the antiproton-proton ($\bar pp$) threshold. We calculate the contribution of the two-step process $e^+e^-\to \bar NN \to$ multipions to the total reaction amplitude. The amplitude for $e^+e^-\to \bar NN$ is constrained from near-threshold data on the $e^+e^-\to \bar pp$ cross section and the one for $\bar NN \to$ multipions can be likewise fixed from available experimental information, for all those $5 \pi$ and $6\pi$ states. The resulting amplitude for $e^+e^-\to$ multipions turns out to be large enough to play a role for the considered $e^+e^-$ annihilation channels and, in three of the four reactions, even allows us to reproduce the data quantitatively near the $\bar NN$ threshold. The structures seen in the experiments emerges then as a threshold effect due to the opening of the $\bar NN$ channel. \\ ( http://arxiv.org/abs/1506.08120 , 36kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1506.07890 (*cross-listing*) Date: Thu, 25 Jun 2015 20:07:45 GMT (310kb) Title: Heavy quarkonia in strong magnetic fields Authors: Claudio Bonati, Massimo D'Elia and Andrea Rucci Categories: hep-ph hep-lat nucl-th Comments: 10 pages, 9 figures, 3 tables Report-no: IFUP-TH/2015-06 \\ We investigate the influence of a homogeneus and constant strong external magnetic field on the heavy-meson spectrum. Quarkonium states $c\bar{c}$ and $b\bar{b}$ are described within a non-relativistic framework and by means of a suitable potential model based on the Cornell parametrization. In particular, in this work we propose a model which takes into account the possible anisotropies emerging at the level of the static quark-antiquark potential, as observed in recent lattice studies. The investigation is perfomed both with and without taking into account the anisotropy of the static potential, in order to better clarify its effects \\ ( http://arxiv.org/abs/1506.07890 , 310kb) ------------------------------------------------------------------------------ \\ arXiv:1506.07956 (*cross-listing*) Date: Fri, 26 Jun 2015 04:24:53 GMT (2172kb) Title: Upper bound of the $N(1440) \rightarrow N(939) + \pi$ decay width obtained from a three-flavor parity doublet model Authors: Hiroki Nishihara and Masayasu Harada Categories: hep-ph nucl-th Comments: 10 pages, 6 figures and 8 tables \\ We study masses and decay widths of positive and negative parity nucleons using a three-flavor parity doublet model, in which we introduce three representations, $\left[({\bf 3} , \bar{{\bf 3}})\oplus (\bar{{\bf 3}} , {\bf 3})\right]$, $\left[({\bf 3} , {\bf 6}) \oplus ({\bf 6}, {\bf 3})\right]$, and $\left[({\bf 8} , {\bf 1}) \oplus ({\bf 1} , {\bf 8})\right]$ of the chiral U$(3)_{\rm L}\times$ U$(3)_{\rm R}$ symmetry. We find an extended version of the Goldberger-Treiman relation among the mass differences and the coupling constants for pionic transitions. This relation leads to an upper bound for the decay width of $N(1440) \rightarrow N(939) + \pi$ independently of the model parameters. We perform the numerical fitting of the model parameters and derive several predictions, which can be tested in future experiments or lattice QCD analysis. Furthermore, when we use the axial coupling of the excited nucleons obtained from lattice QCD analyses, we also find that the ground state nucleon $N(939)$ consists of about 80% of $\left[({\bf 3} , {\bf 6}) \oplus ({\bf 6}, {\bf 3})\right]$ component and about 20% of $\left[({\bf 8} , {\bf 1}) \oplus ({\bf 1} , {\bf 8})\right]$ component, and that the chiral invariant mass of $N(939)$ is about $250$ MeV. \\ ( http://arxiv.org/abs/1506.07956 , 2172kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1504.01363 replaced with revised version Fri, 26 Jun 2015 16:49:45 GMT (567kb) Title: Van der Waals Equation of State with Fermi Statistics for Nuclear Matter Authors: V. Vovchenko, D. V. Anchishkin, M. I. Gorenstein Categories: nucl-th Comments: 20 pages, 5 figures, minor changes to match published version Journal-ref: Phys. Rev. C 91, 064314 (2015) DOI: 10.1103/PhysRevC.91.064314 \\ ( http://arxiv.org/abs/1504.01363 , 567kb) ------------------------------------------------------------------------------ \\ arXiv:1504.02588 (*cross-listing*) replaced with revised version Fri, 26 Jun 2015 11:15:52 GMT (871kb) Title: Anomalous decay and scattering processes of the eta meson Authors: Bastian Kubis, Judith Plenter Categories: hep-ph hep-ex nucl-ex nucl-th Comments: 12 pages, 11 figures; v2 matches version published in EPJC Journal-ref: Eur. Phys. J. C 75 : 283, 2015 DOI: 10.1140/epjc/s10052-015-3495-5 \\ ( http://arxiv.org/abs/1504.02588 , 871kb) ------------------------------------------------------------------------------ \\ arXiv:1506.07238 replaced with revised version Fri, 26 Jun 2015 12:00:27 GMT (280kb) Title: Impurity effects of $\Lambda$ particle on the 2$\alpha$ cluster states of $^{9}$Be and $^{10}$Be Authors: Masahiro Isaka and Masaaki Kimura Categories: nucl-th Comments: 9 pages, 4 figures \\ ( http://arxiv.org/abs/1506.07238 , 280kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arxiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arxiv.org/help/