1. Carla Distefano Status of gSeaGen code Neutrino Generators
phone conference, 25 July 2017

2. Propagation mode in gSeaGen
Propagation mode already implemented but it didn’t produce events at the can
Bud fixed (just a technical problem in calling a ROOT library)
We have first results!
Running code committed in the SVN (dev version)
Use –p option to activate the propagation mode (see the on-line help)
N.B. ντ regeneration no yet implemented

3. Propagation mode Same procedure followed in the standard mode but:
The interaction volume is now coincident with the Earth
Generation surface:
RT large enough to cover the can
RL greater than the Earth
No PEarth in the Generation Weight:
can

4. Interaction volume
Layer
Composition
Rmin (km)
Rmax (km)
Density (g/cm3) 1
Core
500
13.07 2
1000
12.97 3
1221.5
12.82 4
2000
11.94 5
2500
11.44 6
3000
10.91 7
3480
10.27 8
Mantle
4000
5.44 9
4500
5.18 10
5000
4.92 11
5500
4.65 12
5701
4.44 13
5771
3.98 14
5971
3.85 15
6151
3.49 16
6346.6
3.37 17
6356
2.9 18
Rock
6368
2.65 19
SeaWater
1.040
Interaction volume: the whole Earth made by a sequence of layers. Each layer is characterized by a composition and a (constant) density.
PREM model is used to compute the densities.
Layer size is 500 km but taking into account density discontinuities in the PREM model.
PREM
LAYERS

5. Reference flux: 1/(GeV m2 s sr)
First results
Generated events: νe in CC (other cases to be checked)
Energy range: 1 GeV – 5 TeV
Theta range: 1 – 180 deg
Can:
Reference flux: 1/(GeV m2 s sr)
(i.e. wevent=w2/Ngen)
Default mode (no propagation):
Ngen = 1e6 (only 1 run)
Nevt = 8863
Weighed: e+10
Approximate processing time/event: 0.25 ms
Approximate total processing time: s
Propagation mode:
Ngen = 9.96e10 (996 runs * 1e8)
Nevt = (3-5 events per run)
Weighed: e+10
Approximate total processing time: 7 hours/run

6. Other planned checks Ratio:
Check the other channels (νe in NC, other flavours): just to be sure!
Energy range: 1 GeV – 5 TeV
Theta range: 1 – 180 deg
Check the effect of Earth absorption
Energy range: 1 – 5 TeV
Theta range: only up-going events
Ratio:
Events generated with the default mode (no propagation) and weighed with and without the PEarth

7. Problems
Propagation mode is very slow because of the large number of events to be simulated
- try to optimize the code
In some runs, GENIE gave problems (people reported me similar problems in the mass production):
- 5 runs enter in an infinite loop: check if event generation takes more than 1 min, if yes the event generation is stopped, the event is rejected and a new event is simulated
(implemented! dev version in SVN)
- 4 runs still missing (under check)
- 1 run gives a segmentation fault
- 2 runs exceeded the CPU time limit (30 hours)
- 1 run didn’t produce outputs, interrupted but no problems reported in the log files