1 ///////////////////////////////////////////////////////////////////////////
5 // This file is part of starlight.
7 // starlight is free software: you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation, either version 3 of the License, or
10 // (at your option) any later version.
12 // starlight is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with starlight. If not, see <http://www.gnu.org/licenses/>.
20 ///////////////////////////////////////////////////////////////////////////
22 // File and Version Information:
23 // $Rev:: 164 $: revision of last commit
24 // $Author:: odjuvsla $: author of last commit
25 // $Date:: 2013-10-06 16:18:08 +0200 #$: date of last commit
31 ///////////////////////////////////////////////////////////////////////////
41 //This class holds the information for a target nucleus
49 const double deuteronSlopePar,
50 const bool dAuCoherentProduction);
55 int Z () const { return _Z; } ///< returns atomic number of nucleus
56 int A () const { return _A; } ///< returns nucleon number of nucleus
57 // double woodSaxonRadius() const { return 1.2 * pow(_A, 1. / 3.); } ///< returns Wood-Saxon nuclear radius [fm] (Fermi model)
58 double nuclearRadius () const; ///< returns nuclear radius [fm]; except for some special nuclei this is the Wood-Saxon radius (Fermi model)
60 double formFactor(const double t) const; ///< computes form factor for given squared 4-momentum transfer
61 double dipoleFormFactor(const double t, const double t0) const; // Dipole form factor with t0 as parameter
62 double thickness (const double b) const; ///< calculates nuclear thickness function for given distance b in impact parameter space (Eq. 4 in KN, PRC 60)
64 double Q0 () const { return _Q0; }
65 double rho0() const { return _rho0; }
70 double woodSaxonSkinDepth() const { return 0.53; } ///< returns surface (0.53 fm for Au)
71 double fritiofR0 () const { return _r0 * pow(_A, (1./3.)); } ///< Fritiof _r0 (rws)/formfactor
73 double rws(const double r) const
74 { return 1.0 / (1. + exp((r - fritiofR0()) / woodSaxonSkinDepth())); } ///< Wood-Saxon nuclear density
76 int _Z; ///< atomic number of nucleus
77 int _A; ///< nucleon number of nucleus
78 double _deuteronSlopePar; ///< slope parameter for deuteron form factor [(GeV/c)^{-2}]
79 bool _dAuCoherentProduction; ///< if true, production in d Au collisions is coherent, else incoherent