Issue with neutron data in running FLUKA

Running and Runtime Errors
1

Versions

Please provide the used software versions.

FLUKA: fluka-4-5.1.x86-Linux-gfor9.tgz
Flair: flair_3.4-5.2_ubuntu24.04_all.deb, flair-geoviewer_3.4-5.2_ubuntu24.04_amd64.deb
Operating system: Ubuntu 24.04.4 LTS
Compiler: GNU Fortran (Ubuntu 13.3.0-6ubuntu2~24.04.1) 13.3.0

Description

We have installed the versions of FLUKA and FLAIR as mentioned above. The neutron library fluka_pw_jeff-3.3-1-1.tar.gz is downloaded and when installed, a folder JEFF-3.3 is created in /fluka4-5.1/data/neutron/. In .bashrc file path is declared as ‘export PATH=$PATH:/home/grb/fluka4-5.1/bin’. But when the attached input file is run the following error msg received

*** Pointwise neutron data directory /usr/local/fluka/data//neutron not existing.
Please download the neutron libraries from:
FLUKA libraries for low-energy neutron pointwise interaction cross sections | The official CERN FLUKA website
Abort called from XSREAD reason Point wise neutron data not found Run stopped!
STOP Point wise neutron data not found

I would greatly appreciate any guidance to resolve the issue. Thank you very much in advance for your time and help.

Best regards

Maitreyee

Input files

mn.inp (3.3 KB)

test001.err (312 Bytes)

mn.flair (2.7 KB)

mn001.out (26.5 KB)

2

Dear Maitreyee,

please make sure that the neutron directory is where you installed FLUKA. In you case in /home/grb/fluka4-5.1/data.

Cheers,
David

3

Dear David,

Thank you for your reply. The neutron directory is already in /home/grb/fluka4-5.1/data.

Regards

Maitreyee

4

Dear Maitreyee,

I just noticed, the error message indicates, that you have FLUKA installed in the /usr/local/fluka/ directory, probably from a previous installation (likely installed with the .deb package).

You can try to uninstall it with

sudo apt remove fluka

or you put your new installation at the beginning of your path, by changing the export command in your .bashrc file to:

export PATH=/home/grb/fluka4-5.1/bin:$PATH

Cheers,
David