From: G. Battistoni <giuseppe.battistoni_at_mi.infn.it>

Date: Fri, 23 Apr 2010 23:24:14 +0200

Date: Fri, 23 Apr 2010 23:24:14 +0200

Hi

That plot was obtained by plotting the content of a file called **tab.lis

corresponding to the dector associated to your USRBDX. That file

contains a table of values organized

in 4 columns. The table starts from the lowest energy and the four

columns represent respectively

E_min, E_max, the differential fluence F and the statistical error in

percentage Sigma_F

You can obtain the average energy by processing those numbers in the

following way:

For each energy bin you build the product of mean energy of the bin E

times F

and sum together all the results, obtaining S1.

In parallel, you also build the sum of all F values, obtaining S2.

Then the average energy is <E> = S1/S2

In case of a linear energy binning the mean energy of bin i is

(E_max(i)+E_min(i))/2.

For a log energy binning a better evalutation of the mean energy of the

bin is the

square root of the product E_max(i) times E_min(i).

Giuseppe Battistoni

Emre EROGLU wrote:

*> Hi all,
*

*>
*

*> I have positron energy distribution with USRBDX card (see attachment).
*

*> I need to know or calculate mean positron energy. How can i do?
*

*>
*

*> Thanks in advance,
*

*>
*

*> Emre EROGLU
*

*> Uludag University
*

*> High Energy Physcics
*

*>
*

*>
*

*>
*

*> ------------------------------------------------------------------------
*

*>
*

Received on Sat Apr 24 2010 - 00:09:43 CEST

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