id_time_types

               Monte Carlo Event Time Distribution Codes
               =========================================
 
The different types of time distributions used in INGENR and MCG_GENERATOR are:
 
    ID      Mnemonic     Description
    --      --------     -----------
 
    -n       none        Give this particle the same time as particle n
                         (particle n must have already been generated).
    10       IDTFIX      Generate all events with the same time.
    20       IDTUNI      Generate events uniformly in time.
    30       IDTEX1      Generate events with exponentially decaying times
                         (starting at some t0).
    40       IDTEX2      Generate events with exponentially decaying times
                         (starting at some previous particle time).
    50       IDTRATE     Generate proper time distribution for CC, ES and
                         NC events from solar neutrinos.
                         See warning
    60       IDTUSR      Generate times using user specified distribution.
    70       IDTGAUS     Gaussian distribution with early and late cutoffs.
                         (intended for the fibreoptic/Laserball)
    80       IDTSNV      Generate time distribution for a type II supernova 
                         neutrino burst, with different shapes dependent upon
                         the neutrino type chosen. 
   100       IDTPL       Generate events with directions taken from a MCPL bank
                         (see MCPL bank).


Notes:  All implemented.
 
For the different distributions there are different input parameters to be
stored in the TIM_PARAM array.  These are:
 
 TIM Type   Param. #   Description
 --------   --------   -----------
 
    10       1         Selected time.
    20       1,2       Earliest and latest times for events.
    30       1         Earliest time for an event.
             2         Mean of truncated Gaussian from which mean life for
                       exponential is selected.
             3         Standard deviation of truncated Gaussian from which
                       mean life for exponential is selected (if <= 0,
                       preceding parameter is used as fixed mean life).
    40       1         Mean life for decay.
             2         Number of particle for exponential decay to start with.
    50       1..5      Obsolete date, now taken from $initial_date command
             6         Event Rate (in units of event/day).
             7         Correct rate for Earth orbit eccentricity (0=no, 1=yes).
    60       ?         User defined.
    70       1,2       Earliest and latest times (to avoid acausal-early and
                       long-late tails)
             3         Sigma of Gaussian (nsec)
             4         Mean offset (nsec).
                       Be sure that: PARAM(1) < PARAM(4) < PARAM(2)
    80       -         None. Neutrino type taken from energy distribution.
   100       none