Nucl.Data Tables 7

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NORTtlCLIFFE AND SCIIXLLING ,o a. ~ k d. ,J30 ~ I~ ~ (-3s_ '/''-~"~c .s.'" z . . ~'~ My~*, ,'~l~Tr " C ~ IS '''l -ilx*" I. " I[./"~, '" o 'go ,I '='~ ENERGY (MeV) ENERGY (MeV) ENERGY (ieV) ENERGY (ieV) Fig. 13. a: Ref. 6 i: 9 I49Tb't49Dy'IS~ Ref. 47 lSlDy in It 2 J b: Ref. 6 e: Ref. 41 Comparison of tabulated values (solid lines) with miscellaneous experimental data d: 149Tb in Ah Ref. 42 e: 34Clin Ah Ref. 43 ) mlS~ in H2 j: 9BeinAh Ref. 48 k: 22NeinAh Ref. 49 h 24NainAh Ref. 49 f: *126BainAl IRef. 44 [] 12SBa inAl . m: llCinAl: Ref. 50 m t26Ba in AI n: 4tArinAh Ref. 51 o: lSNinAu: Ref. 52 g: 142Sm in Ah Ref. 45 p: 9Be in Au: Ref. 48 h: []6~ ] iRef" 46 q: lSNinAg: Ref. 53 9 61Cu in AI r: ISNinNi: Ref. 53 --6~ in AI 248
VIII. DISCUSSION AND CONCLUSION RANGE AND STOPPING-POWER TABLES FOR HEAVY IONS In the course of this work, we noticed that various ex- 1. perimental data were in conflict with the simple working hy- potheses outlined in Section IV A. Examples of such conflict are: (a) the apparent z-dependence of the relative stopping- power data at low energies (see notes in Ref. 29); (b) the disagreement between the adopted relative stopping-power curves and corresponding curves for protons as determined 2. from Refs. 20, 23, 27, and 28 (see Figs. 4-6); (c)the discrep- ancy between certain heavy-ion data and the adopted relative stopping-power curves (e.g., Ne and O ions in C, Figs. 4&5). 3. The occurrence of such discrepancies raised several 4. questions: (1) Could the conflict be decreased if the aluminum master curves or the adopted relative stopping-power curves were altered? In general, the answer was no, since any 5. substantial change would increase disagreement with other data. (2) Were the discrepancies consistent with experimental uncertainties? As close inspection of the carbon relative stopping-power data will show (see Fig. 5) the disagreement between different measurements for the same ion (two for Ne ions, three for O ions, several for Br and I ions) often is as large as the deviations from the adopted curves. (3) Could z-dependence effects be taken into account in some way? Again, an inspection of the data reveals no simple systematic dependence on z. The z-dependence predicted by the LSS 8. theory is not verified by experiment. Any attempt to account for such effects would be based on inadequate expert- 9. mental evidence and would therefore be of dubious validity, would greatly complicate the computation, and would cause little or no change in the tabulations at high energy. (4) 10. Should the attempt to generate this tabulation be abandoned? In view of the relatively large body of data consistent with the adopted curves, the reasonable agreement shown in Figs. 11-13, and the widespread need for such information, this negative view was rejected. It seemed best to ignore the poor fits to proton stopping power at low energy sinc~ the main objective of this tabulation was to cover heavier ions. In any event our proton range data are in good agreement with other tabulations ~~ (typically, better than 1% at high energies). 11. Most of this tabulation extends into regions of energy and mass completely devoid of experimental data. It is to be expected that heavy-ion accelerators yet to be built will push into these regions and eventually determine the accuracy of the predictions, but in the meantime they should serve as a platisibl~ and coherent reference for estimating the comparaiive behavior of very heavy ions at very high energies. 249 IX. REFERENCES L. C. Northchffe, Arm. Rev. Nucl. Sci. 13, 67 (1963). Note that Eq. 23 of this paper is incorrect; the power of the denominator on the right side should be 3]2 rather than 1/2 L. C. Northcliffe, "Studies in Penetration of Charged Particles in Matter," NAS-NRC Publication 1133, Nu- clear Science Series, Report No. 39, p. 173 (1964) P. G. Roll and F. E. Steigert, Nucl. Phys. 17, 54 (1960) F. W. Martin and L. C. Northcliffe, Phys. Rev. 128, 1166 (1962) BridweU, Northcliffe, Datz, Moak, and Lutz, Phys. Rev. 159,276 (1967); C. D. Monk and M. D. Brown, Phys. Rev. 149,244 (1966); L. B. Bridwell and C. D. Moak, Phys. Rev. 156,242 (1967) 6. W. Booth and I. S. Grant, Nucl. Phys. 63, 481 (1965) 7. T.E. Pierce and M. Blann, Phys. Rev. 173,390 (1968) 12. 13. J. H. Ormrod, Can. J. Phys. 46, 497 (1968) B. Fastrup, A. Borup, and P. Hvelplund, Can. J. Phys. 46, 489 (1968) At high velocities it is well-known that -clE/dx is proportional to the square of the ion charge (see Ref. 1). Titus, at sufficiently high velocities when the ion is stripped of all electrons the stopping power becomes proportional to the square of the atomic number of the ion. It is convenient to remove this z 2 dependence and plot (-l/z 2) dE/dx when comparing the stopping power of different ions. While the tables have been calculated using atomic mass values m for the ions the accuracy of the results do not justify this refinement and it is appropriate to use the mass number A rather than the atomic mass rn. N. Bohr, Kgl. Danske Videnskab. Selskab, Mat.-Fys. Medd. 18, 8 (1948) H. H. Andersen, H. Simonsen, and H.SCrensen, Nucl. Phys. A125, 171 (1969)
Page 1 and 2: NUCLEAR DATA TABLES, A7,233-463 (19
Page 3 and 4: i. INTRODUCTION The problem of dete
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ENs PER MASS UNIT MEV/AMU 0.0125 0.
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ENERGY PER MASS LINIT MEV/AMU 0.012
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E 0 E v bd CD Z rr" NORTHCLIFFE AND
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04 E O E ILl (.9 Z rr NORTIICLIFFE
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Nucl.Data Tables 7

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