When high-energy heavy ions beam is incident into solid material, the energy deposition density along the ions flight path can change the macroscopic target temperature and pressure, and may create new material defects under such high-pressure and high-density conditions. To accurately control the extreme state in material generated by heavy ions beam, it is necessary to conduct detailed research on the energy deposition density of ions and figure out the new potential defects in matter. This paper reports the new experiment at the HIRFL-CSR at Lanzhou, where 264 MeV/u Xe<sup>36+</sup>ions beams are extracted to irradiate a LiF crystal target. The emission spectrum of the LiF was measured in-situ. Moreover, the changes in crystal color along ions path are observed (shown as Fig.1), and XRD (X-ray Diffraction) as well as XPS(X-ray photoelectron spectroscopy) are applied to predict the potential new phases at different positions of crystal through the target dissociation method. It is apparent that in No.3- front(the red line）a new phase around 52.6 degree is found in XRD result, which is believed as LiF<sub>3</sub> (LiF+F<sub>2</sub>) structural phase and appear in the Bragg peak region of Xe ions in LiF. Furthermore, to verify this result, a similar experiment was done by using 430MeV/u <sup>84</sup>Kr<sup>26+</sup>ions beam, and the stacked layered LiF target was analyzed after the irradiation. XPS result shows more complex defects aggregates in the Bragg peak region of Kr ions in LiF at room temperature. In previous study, such complex defects all generated under high temperature conditions. We figure out that these complex defects can be produced around the Bragg peak region of ions in LiF at room temperature, where a temporally high temperature and high pressure condition could be generated. This paper can provide some experimental evidences and references for the target material modification in high-energy density physics research driven by heavy ions beam.
