Date: Thu, 25 Dec 08 01:00:24 GMT Subject: nucl-th daily 2 new + 2 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any complaints regarding submissions directly to submitter. ------------------------------------------------------------------------------ Point your www client at http://arXiv.org/ To unsubscribe, e-mail To: nucl-th@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 23 Dec 08 21:00:01 GMT to Wed 24 Dec 08 21:00:01 GMT ------------------------------------------------------------------------------ \\ arXiv:0812.4499 Date: Wed, 24 Dec 2008 20:22:58 GMT (196kb,D) Title: Incompressibility of neutron-rich matter Authors: J. Piekarewicz and M. Centelles Categories: nucl-th Comments: 23 pages, 9 figures, and 4 tables (submitted to PRC) \\ The saturation properties of neutron-rich matter are investigated in a relativistic mean-field formalism using two accurately calibrated models: NL3 and FSUGold. The saturation properties - density, binding energy per nucleon, and incompressibility coefficient - are calculated as a function of the neutron-proton asymmetry alpha=(N-Z)/A to all orders in alpha. Good agreement (at the 10% level or better) is found between these numerical calculations and analytic expansions that are given in terms of a handful of bulk parameters determined at saturation density. Using insights developed from the analytic approach and a general expression for the incompressibility coefficient of infinite neutron-rich matter, i.e., K0(alpha)=K0+Ktau*alpha^{2}+..., we construct a Hybrid model with values for K0 and Ktau as suggested by recent experimental findings. Whereas the Hybrid model provides a better description of the measured distribution of isoscalar monopole strength in the Sn-isotopes relative to both NL3 and FSUGold, it significantly underestimates the distribution of strength in 208Pb. Thus, we conclude that the incompressibility coefficient of neutron-rich matter remains an important open problem. \\ ( http://arxiv.org/abs/0812.4499 , 196kb) ------------------------------------------------------------------------------ \\ arXiv:0812.4532 Date: Wed, 24 Dec 2008 13:10:34 GMT (72kb) Title: A Novel Approach in Solving the Spinor-Spinor Bethe-Salpeter Equation Authors: S.M. Dorkin, M. Beyer, S.S. Semikh, L.P. Kaptari Categories: nucl-th Comments: 8 pages, 3 figures, Talk given at XIX Int. Baldin Seminar "Relativistic Nuclear Physics and Quantum Chromodynamics", Sept. 29-Oct.4, Dubna, 2008 \\ To solve the spinor-spinor Bethe-Salpeter equation in Euclidean space we propose a novel method related to the use of hyperspherical harmonics. We suggest an appropriate extension to form a new basis of spin-angular harmonics that is suitable for a representation of the vertex functions. We present a numerical algorithm to solve the Bethe-Salpeter equation and investigate in detail the properties of the solution for the scalar, pseudoscalar and vector meson exchange kernels including the stability of bound states. We also compare our results to the non relativistic ones and to the results given by light front dynamics. \\ ( http://arxiv.org/abs/0812.4532 , 72kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:0810.1062 (*cross-listing*) Date: Mon, 6 Oct 2008 20:52:45 GMT (8kb) Date (revised v2): Tue, 9 Dec 2008 00:13:14 GMT (10kb) Date (revised v3): Wed, 24 Dec 2008 06:03:53 GMT (49kb,D) Title: Spontaneous Buckling of Doped Graphene? Authors: Doron Gazit Categories: cond-mat.mtrl-sci cond-mat.mes-hall hep-th nucl-th Comments: 4 pages; submitted to prl Report-no: INT-PUB-08-47 \\ Graphene is a realization of a novel class of materials - electronic crystalline membranes. We study the interplay between the free-electrons and the two-dimensional crystal, and find that it induces a substantial effect on the elastic structure of the membrane. For hole-doped membrane, in particular, we predict a spontaneous buckling. In addition, attenuation of elastic waves is expected, due to the effect of corrugations on the bulk-modulus. These discoveries have a considerable magnitude in Graphene, affecting both its mesoscopic structure, and its electrical-resistivity, which has an inherent asymmetry between hole and electron-doped Graphene. \\ ( http://arxiv.org/abs/0810.1062 , 49kb) ------------------------------------------------------------------------------ \\ arXiv:0812.4250 (*cross-listing*) Date: Mon, 22 Dec 2008 17:28:28 GMT (30kb) Title: Hard bremsstrahlung in the pp -> pp gamma reaction Authors: A.Johansson and C.Wilkin Categories: nucl-ex nucl-th Comments: 8 pages including 3 eps figures \\ The pp -> pp gamma reaction has been measured at a beam energy of 310 MeV by detecting both final protons in the PROMICE-WASA facility and identifying a missing-mass peak. For those events where the pp excitation is less than 3 MeV, the final diproton is almost purely in the 1S0 state and, under these conditions, there is complete coverage in the photon c.m. angle theta_gamma. The linear behaviour observed in cos^2(theta_gamma) shows that there is almost no influence of an E2 multipole at this energy, though the E1 and M2 must be rather similar in size. \\ ( http://arxiv.org/abs/0812.4250 , 30kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:0812.4401 replaced with revised version Wed, 24 Dec 2008 11:33:23 GMT (669kb) Title: Universality of the Diffusion Wake from Stopped and Punch-Through Jets in Heavy-Ion Collisions Authors: Barbara Betz, Jorge Noronha, Giorgio Torrieri, Miklos Gyulassy, Igor Mishustin, Dirk H. Rischke Categories: nucl-th Comments: 9 pages, 6 figures \\ ( http://arxiv.org/abs/0812.4401 , 669kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- 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/ For a list of archive mirror sites, see http://arXiv.org/servers.html ----------------------------------------------------------------------------- Third-party submissions cause excessive problems. Author self-submissions are exceedingly preferred. E-mail submissions have been discontinued in favor of better support for Web submissions. See http://arXiv.org/help/uploads