Import Geant4 0.0.0 source tree

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+$Id: README,v 2.1 1998/09/27 07:19:57 asaim Exp $
+-------------------------------------------------------------------
+
+     =========================================================
+     Geant4 - an Object-Oriented Toolkit for Simulation in HEP
+     =========================================================
+
+                            ExampleN01
+                            ----------
+
+ ExampleN01 is the simplest example in this novice level examples. It has 
+a tracker tube and a sandwitch calorimeter made of boxes. It shoots a 
+geantino (pseudo-particle which has no "real" physics interaction) per 
+one event. This example demonstrates how the basic GEANT4 framework works.
+
+1. Detector descreption
+
+ The detector is defined in ExN01DetectorConstruction.cc. Argon gas,
+alminum and lead are defined first, where all of them are single element
+material. Though materials are assigned for each volume, they will not
+affect to the trajectory of a geantino.
+
+ The experimental hall, which is the world volume, is made of alminum
+and it is a box. The tracker tube made of argon gas is placed at 
+(-1m,0m,0m) respect to the origin of the world volume. The calorimeter
+block made of lead and it has 19 layers of alminum plates inside.
+
+2. Physics processes
+
+ ExN01PhysicsList.cc defines only a geantino and a transprotation
+process. Though cutoff will not be applied onto geantino, a dummy
+valume must be set.
+
+3. Event generation
+
+ G4ParticleGun is instanciated in the constructor of 
+ExN01PrimaryGeneratorAction class. At the every event, the public
+method GeneratePrimaries(G4Event*) is invoked. In this method,
+G4ParticleGun is accessed to generate a primary particle (geantino).
+ Please note that the direction of the primary particle is set
+just before shooting, i.e. GeneratePrimaryVertex() method invokation.
+G4ParticleGun class itself does not have any capability of randomizing
+the energy nor momentum of the primary particle. Thus the user should
+implement randomizing code in GeneratePrimaries() method.
+
+4. main()
+
+ exampleN01.cc has the main() method. In this main() method, three
+mandatory user classes described above are constructed and set to
+the G4RunManager object. Then, "Initialize()" method of G4RunManager
+is invoked. 
+ Some UI commands for setting verbosity are applied via hardly coded
+"ApplyCommand()" method of G4UImanager class.
+ "BeamOn()" method triggers the event loop. The argument of this
+method is the number of event in this run.
+
+