Date: Thu, 29 Jan 15 01:21:40 GMT Subject: nucl-th daily 5 new + 3 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 Tue 27 Jan 15 21:00:00 GMT to Wed 28 Jan 15 21:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:1501.06945 Date: Tue, 27 Jan 2015 22:02:08 GMT (224kb) Title: Nuclear equation of state and finite nucleon volumes Authors: Jacek Ro\.zynek Categories: nucl-th hep-ph Comments: 12 pages,3 figures. Accepted in Journal of Physics G; Nuclear and Particle Physics. arXiv admin note: substantial text overlap with arXiv:1311.3591 \\ It is shown how the Equation of State (EoS) depends on nucleon properties inside Nuclear Matter (NM). We propose to benefit from the concept of enthalpy in order to include volume corrections to the nucleon rest energy, which are proportional to pressure and absent in a standard Relativistic Mean Field (RMF) with point-like nucleons. As a result, the nucleon mass can decrease inside NM, making the model nonlinear and the EoS softer. The course of the EoS in our RMF model agrees with a semi-empirical estimate and is close to the results obtained from extensive DBHF calculations with a Bonn A potential, which produce an EoS stiff enough to describe neutron star properties (mass--radius constraint), especially the masses of PSR J1614_2230 and PSR J0348_0432, known as the most massive ($\sim 2 M_\odot$) neutron stars. The presented model has proper saturation properties, including a good value of compressibility. \\ ( http://arxiv.org/abs/1501.06945 , 224kb) ------------------------------------------------------------------------------ \\ arXiv:1501.06970 Date: Wed, 28 Jan 2015 01:33:29 GMT (172kb) Title: Present Status of Fission Research Based on TDDFT Authors: Yoritaka Iwata Categories: nucl-th nucl-ex Comments: To appear in the proceedings of the 2014 symposium on nuclear data \\ Fission resulting from collision of atomic nuclei is systematically investigated based on time-dependent density functional calculations. Time-dependent density functional theory (TDDFT) is a framework, which enables us to treat quantum many-body dynamics with nucleon degrees of freedom. In this article a theoretical framework called Composite-Nucleus Constrained TDDFT is introduced, and charge equilibrium hypothesis for collision fission dynamics is examined. \\ ( http://arxiv.org/abs/1501.06970 , 172kb) ------------------------------------------------------------------------------ \\ arXiv:1501.06994 Date: Wed, 28 Jan 2015 05:50:15 GMT (205kb,D) Title: Complex-energy approach to sum rules within nuclear density functional theory Authors: Nobuo Hinohara, Markus Kortelainen, Witold Nazarewicz, Erik Olsen Categories: nucl-th Comments: 11 pages, 2 figures, submitted to Phys. Rev. C \\ The linear response of the nucleus to an external field contains unique information about the effective interaction, correlations, and properties of its excited states. To characterize the response, it is useful to use its energy-weighted moments, or sum rules. By comparing computed sum rules with experimental values, the information content of the response can be utilized in the optimization process of the nuclear Hamiltonian or EDF. But the additional information comes at a price: compared to the ground state, computation of excited states is more demanding. To establish an efficient framework to compute sum rules of the response that is adaptable to the optimization of the nuclear EDF and large-scale surveys of collective strength, we have developed a new technique within the complex-energy FAM based on the QRPA. To compute sum rules, we carry out contour integration of the response function in the complex-energy plane. We benchmark our results against the conventional matrix formulation of the QRPA theory, the Thouless theorem for the energy-weighted sum rule, and the dielectric theorem for the inverse energy-weighted sum rule. We demonstrate that calculated sum-rule values agree with those obtained from the matrix formulation of the QRPA. We also discuss the applicability of both the Thouless theorem about the energy-weighted sum rule and the dielectric theorem for the inverse energy-weighted sum rule to nuclear density functional theory in cases when the EDF is not based on a Hamiltonian. The proposed sum-rule technique based on the complex-energy FAM is a tool of choice when optimizing effective interactions or energy functionals. The method is very efficient and well-adaptable to parallel computing. The FAM formulation is especially useful when standard theorems based on commutation relations involving the nuclear Hamiltonian and external field cannot be used. \\ ( http://arxiv.org/abs/1501.06994 , 205kb) ------------------------------------------------------------------------------ \\ arXiv:1501.07120 Date: Wed, 28 Jan 2015 14:54:25 GMT (703kb) Title: 2p-2h excitations in neutrino scattering: angular distribution and frozen approximation Authors: I. Ruiz Simo, C. Albertus, J.E. Amaro, M.B. Barbaro, J.A. Caballero and T.W. Donnelly Categories: nucl-th Comments: 8 pages, 4 figures. Contribution to 16th International Workshop on Neutrino Factories and Future Neutrino Beam Facilities, 25-30 August, 2014. Held at University of Glasgow, United Kingdom \\ We study the phase-space dependence of 2p-2h excitations in neutrino scattering using the relativistic Fermi gas model. We follow a similar approach to other authors, but focusing in the phase-space properties, comparing with the non-relativistic model. A careful mathematical analysis of the angular distribution function for the outgoing nucleons is performed. Our goals are to optimize the CPU time of the 7D integral to compute the hadron tensor in neutrino scattering, and to conciliate the different relativistic and non relativistic models by describing general properties independently of the two-body current. For some emission angles the angular distribution becomes infinite in the Lab system, and we derive a method to integrate analytically around the divergence. Our results show that the frozen approximation, obtained by neglecting the momenta of the two initial nucleons inside the integral of the hadron tensor, reproduces fairly the exact response functions for constant current matrix elements. \\ ( http://arxiv.org/abs/1501.07120 , 703kb) ------------------------------------------------------------------------------ \\ arXiv:1501.07230 Date: Wed, 28 Jan 2015 18:47:43 GMT (7kb) Title: On the accuracy of using Fokker Planck equation in heavy ion collision Authors: Nirupam Dutta, Trambak Bhattacharyya Categories: nucl-th hep-ph nucl-ex Comments: 3 pages \\ Application of Fokker-Planck equation to heavy quark transport in the evolving medium created in heavy ion collision is critically scrutinised. We realise that the approach introduces a moderate uncertainty in drag and diffusion coefficients culminating in huge ambiguity in the theoretical prediction of nuclear modification factor $R_{AA}$. Quantitative estimation of the error is presented by considering recent developments in this field. \\ ( http://arxiv.org/abs/1501.07230 , 7kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:1501.06991 (*cross-listing*) Date: Wed, 28 Jan 2015 05:18:28 GMT (15kb) Title: Quantum decoherence in the entanglement entropy of a composite particle and its relationship to coarse graining in the Husimi function Authors: Yoshiko Kanada-En'yo Categories: quant-ph cond-mat.str-el math-ph math.MP nucl-th Comments: 4 pages, 1 figure Report-no: KUNS-2542 \\ I investigate quantum decoherence in a one-body density matrix of a composite particle consisting of two correlated particles. Because of a two-body correlation in the composite particle, quantum decoherence occurs in the one-body density matrix that has been reduced from the two-body density matrix. As the delocalization of the distribution of the composite particle grows, the entanglement entropy increases, and the system can be well-described by a semi-classical approximation, wherein the center position of the composite particle can be regarded as a classical coordinate. I connect the quantum decoherence in the one-body density matrix of a composite particle to the coarse graining in a phase space distribution function of a single particle and associate it with the Husimi function. \\ ( http://arxiv.org/abs/1501.06991 , 15kb) ------------------------------------------------------------------------------ \\ arXiv:1501.07027 (*cross-listing*) Date: Wed, 28 Jan 2015 08:36:47 GMT (29kb) Title: On the question of current conservation for the Two-Body Dirac equations of constraint theory Authors: Matthias Lienert Categories: quant-ph hep-th nucl-th Comments: 25 pages, no figures \\ The Two-Body Dirac equations of constraint theory are of special interest not only in view of applications for phenomenological calculations of mesonic spectra but also because they avoid no-go theorems about relativistic interactions. Furthermore, they provide a quantum mechanical description in a manifestly Lorentz invariant way using the concept of a multi-time wave function. In this paper, we place them into the context of the multi-time formalism of Dirac, Tomonaga and Schwinger for the first time. A general physical and mathematical framework is outlined and the mechanism which permits relativistic interaction is identified. The main requirement derived from the general framework is the existence of conserved tensor currents with a positive component which can play the role of a probability density. We analyze this question for a general class of Two-Body Dirac equations thoroughly and comprehensively. While the free Dirac current is not conserved, it is possible to find replacements. Improving on previous research, we achieve definite conclusions whether restrictions of the function space or of the interaction terms can guarantee the positive definiteness of the currents -- and whether such restrictions are physically adequate. The consequences of the results are drawn, with respect to both applied and foundational perspectives. \\ ( http://arxiv.org/abs/1501.07027 , 29kb) ------------------------------------------------------------------------------ \\ arXiv:1501.07127 (*cross-listing*) Date: Wed, 28 Jan 2015 15:02:37 GMT (13kb) Title: The Tsallis Distribution at Large Transverse Momenta Authors: M.D. Azmi and J. Cleymans Categories: hep-ph nucl-th Comments: 5 pages, 2 figures \\ Fits to the transverse momentum distributions of charged particles produced in p - p collisions at LHC energies based on the Tsallis distribution have been shown to work over 14 orders of magnitude. Two versions of the Tsallis distribution are compared and discussed, the thermodynamically consistent version leads to a temperature of T = 74 +/- 13 MeV at the highest beam energy, a result which is in agreement with previous analyses done with lower transverse momentum data. \\ ( http://arxiv.org/abs/1501.07127 , 13kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1405.6474 replaced with revised version Wed, 28 Jan 2015 06:52:55 GMT (144kb) Title: Pole structure from energy-dependent and single-energy fits to $\pi N$ elastic scattering data Authors: Alfred \v{S}varc, Mirza Had\v{z}imehmedovi\'c, Hedim Osmanovi\'c, Jugoslav Stahov, Ron L. Workman Categories: nucl-th Comments: 12 pages,5 tables,2 figures. arXiv admin note: substantial text overlap with arXiv:1401.1947, arXiv:1404.1544 Journal-ref: Phys. Rev. C91, 015205 (2015) \\ ( http://arxiv.org/abs/1405.6474 , 144kb) ------------------------------------------------------------------------------ \\ arXiv:1408.6941 replaced with revised version Wed, 28 Jan 2015 08:48:00 GMT (266kb) Title: Ground state octupole correlation energies with effective forces Authors: Luis M. Robledo Categories: nucl-th Comments: 5 pages, 3 figures, 3 extra figures as supplemental material \\ ( http://arxiv.org/abs/1408.6941 , 266kb) ------------------------------------------------------------------------------ \\ arXiv:1411.0280 (*cross-listing*) replaced with revised version Wed, 28 Jan 2015 17:51:14 GMT (104kb) Title: Evidence on the absence of critical transition in AMPT for Pb-Pb collisions at $sqrt{s_{\rm{NN}}}$ = 2.76 TeV Authors: Ramni Gupta and Rohni Sharma Categories: nucl-ex hep-ph nucl-th Comments: 15 pages, 11 Figuers \\ ( http://arxiv.org/abs/1411.0280 , 104kb) ------------------------------------------------------------------------------ \\ arXiv:1501.03788 replaced with revised version Wed, 28 Jan 2015 16:48:47 GMT (6kb) Title: The scissors mode from a different perspective Authors: Matthew Harper and Larry Zamick Categories: nucl-th \\ ( http://arxiv.org/abs/1501.03788 , 6kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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/