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1 | /////////////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // Copyright 2010 | |
4 | // | |
5 | // This file is part of starlight. | |
6 | // | |
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. | |
11 | // | |
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. | |
16 | // | |
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/>. | |
19 | // | |
20 | /////////////////////////////////////////////////////////////////////////// | |
21 | // | |
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 | |
26 | // | |
27 | // Description: | |
28 | // | |
29 | // | |
30 | // | |
31 | /////////////////////////////////////////////////////////////////////////// | |
32 | ||
33 | ||
34 | #ifndef NUCLEUS_H | |
35 | #define NUCLEUS_H | |
36 | ||
37 | ||
38 | #include <cmath> | |
39 | ||
40 | ||
41 | //This class holds the information for a target nucleus | |
42 | class nucleus | |
43 | { | |
44 | ||
45 | public: | |
46 | nucleus(); | |
47 | nucleus(const int Z, | |
48 | const int A, | |
49 | const double deuteronSlopePar, | |
50 | const bool dAuCoherentProduction); | |
51 | ~nucleus(); | |
52 | ||
53 | void init(); | |
54 | ||
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) | |
59 | ||
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) | |
63 | ||
64 | double Q0 () const { return _Q0; } | |
65 | double rho0() const { return _rho0; } | |
66 | ||
67 | ||
68 | private: | |
69 | ||
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 | |
72 | ||
73 | double rws(const double r) const | |
74 | { return 1.0 / (1. + exp((r - fritiofR0()) / woodSaxonSkinDepth())); } ///< Wood-Saxon nuclear density | |
75 | ||
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 | |
80 | ||
81 | double _r0; | |
82 | double _rho0; | |
83 | double _Q0; | |
84 | ||
85 | }; | |
86 | ||
87 | ||
88 | #endif // NUCLEUS_H |