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units

Asked by Giacomo

What are the units used detector_density? Thanks!

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Giacomo (gmarocco) said : 		#1

I now see in the paper that the density is 3.72 g/cm^3. This is the same as in the XXX_cmd so that answers the above questions. Now, the relevant parameter is really the scattering site number density. How is this conversion done?

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Giacomo (gmarocco) said : 		#2

Another somewhat related question:

In the events, there is something called vert_displacement. To confirm, is this the shortest distance from the event to the bottom of the detector in cm?

Thank you!

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Olivier Mattelaer (olivier-mattelaer) said : 		#3

We do not have that in the lhef file.
For the other type of output, they are not handle by us, and the best it to look at the associated paper to see what is the meaning of each entry

Cheers,

Olivier

> On 17 Apr 2020, at 17:53, Giacomo <email address hidden> wrote:
>
> Question #689738 on maddump changed:
> https://answers.launchpad.net/maddump/+question/689738
>
> Giacomo posted a new comment:
> Another somewhat related question:
>
> In the events, there is something called vert_displacement. To confirm,
> is this the shortest distance from the event to the bottom of the
> detector in cm?
>
> Thank you!
>
> --
> You received this question notification because you are an answer
> contact for maddump.

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Giacomo (gmarocco) said : 		#4

Are you sure? It is the output of MadDump in the interaction_electron/Event/unweighted_events.lhe file.

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Best Luca (lbuono) said : 		#5

Hi Giacomo,

the number of scattering centres is derived from the knowledge of the detector density in g/cm^3 and its volume, which
in turn is provided specifying the geometry. The conversion is the usual formula of the total mass in g multiplied by Avogrado's number. This gives the number of nucleons. In case you are considering scattering with the electrons, the ratio average_Z/average_A is used to rescaled it to the number of electrons.

As for the vert_displacement, it gives the distance (in cm) travelled within the detector by the DM starting from the surface of the detector up to the scattering point along its direction of flight. It's trivially generated uniformly (which means we assume a free travel distance much bigger than the characteristic dimensions of of the detector, as it should be the case for very weak interactions), but it takes into account the actual geometrical limits of detector (so nothing is generated outside the detector)

I hope this clarify your doubts.

Cheers,
Luca

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Giacomo (gmarocco) said : 		#6

Thanks Luca, that solved my question.