Dear @EzgiUslan
Further details on what you are trying to achieve exactly would have been very useful, luckily they were provided in a complementary short-lived post.
There are few things preventing you from getting meaningful results:
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FLUKA’s default energy unit is GeV, not MeV, as I guess you assumed. So the energy of you neutron beam is currently 25.3 eV, and the energy range in your DETECT card is [~0,100] GeV. I believe this was not your intention.
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Most probably you want the DETECT card to be linked to your detector region. Right now it is linked to the target region.
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You also need the correlated generation of alpha and triton from the Li-6(n,alpha) reaction, to obtain it you have to activate the neutron pointwise treatment for Li-6. And for doing this you need to create a monoisotopic material for Li-6 and use it in the definition of your LiF compound. Please see note 5 of LOW-NEUT and How to set the low energy neutron cross sections for further details. Attention to the naming of the material!
Hope this helps,
Francisco