We report on observations of the neutron star ( NS ) residing in the low-mass X-ray binary 1RXS J180408.9-34205 taken 2015 March by NuSTAR and XMM-Newton while the source was in the hard spectral state .
We find multiple reflection features ( Fe K _ { \alpha } detected with NuSTAR ; N VII , O VII , and O VIII detected in the RGS ) from different ionization zones .
Through joint fits using the self consistent relativistic reflection model relxill , we determine the inner radius to be \leq 11.1 R _ { g } .
For a 1.4 M _ { \odot } NS with a spin of a _ { * } = 0 , this is an inner disk radius of \leq 22.2 km .
We find the inclination of the system to be between 18 ^ { \circ } - 29 ^ { \circ } .
If the disk is truncated at a radius greater than the neutron star radius , it could be truncated by a boundary layer on the neutron star surface .
It is also possible that the disk is truncated at the magnetospheric radius ; conservative estimates would then imply B \leq ( 0.3 - 1.0 ) \times 10 ^ { 9 } G at the magnetic poles , though coherent pulsations have not been detected and the source is not identified as a pulsar .