An experimental study of stopping power for MeV heavy ions

Abstract

A 60 MeV Ag primary ion beam was used to generate secondary recoil ion beams of Cl, K, Ca, Sc, Ti, V, Mn and Cu in the energy range 0.1-0.6 MeV n −1 . The stopping power in the carbon absorber was measured and compared with Lindhard, Scharff and Schiott (LSS) theory, the Northcliffe and Schilling model and semiempirical estimates of Ziegler et al (1985). Data for heavier ions of Ag, I and Au from other sources was also considered in order to extend the scope of such a comparison. LSS theory was found to satisfy the data within a narrow mid-velocity range (∼0.6-0.8v 0 Z 2/3 1 , where v 0 is Bohr velocity). Estimates made by Ziegler et al were seen to generally agree to within a few per cent except for energies below 0.2 MeV n −1 , where deviations as high as 25% were seen. Expected Z 1 oscillations could not be discerned down to the lowest ion velocities (v = 2v 0 ) so far attempted.

Carbon Elastic and Inelastic Stopping-Power Components for Heavy Ions at Bohr and Higher Velocities

“…The ratios of the SP expt tot and SP SRIM tot values for Ar and K ions are shown in Figure 9. The Ar and K SP expt tot data were taken from the respective tables [9,11,20,26,31], whereas the Ar data obtained by Giessel et al were taken from the database [2]. The low-velocity Ar SP data [22] were obtained using tabulated input and output energies (E in and E out , respectively), target thickness ∆X, and the relationship:…”

“…Figure 10 shows the Ca and Sc SP data [9][10][11]26,27,31,32] in comparison to SRIM calculations. As one can see, the fitting curve does not provide the match of the Ca data [9,26,27] using the function determined by Equation ( 8), even when omitting the data [31] at 0.3 < V r < 0.4. It is implied that the data [9] at relatively high velocities and the data [27] at relatively low velocities are reliable.…”

“…The fitting parameter values thus obtained for the Ca and Sc data are listed in Table 1. The same as in Figure 8, but for the data from [2,[9][10][11]20,22,26,31] for Ar and K ions only (upper and bottom panels, respectively). The results of data fits with Equation ( 8) are shown by dashed lines (the data [11,20] were excluded from these fits).…”

“…Relative velocity V/v 0 is shown in the upper axes of the panels for orientation. The same as in Figure 9, but for the data from [9][10][11]26,27,31,32] for Ca and Sc ions (upper and bottom panels, respectively). See the text for details.…”

Velocity dependence of heavy-ion stopping below the maximum

“…Same as Fig. 1 for H and Cl in C. Original data from [5,26,27,[33][34][35][36][37][38][39][40][41][42][43]. Listing of proton in Ref.…”