Stopping powers from the inverted Doppler shift attenuation method: Z-oscillations; Bragg's rule or chemical effects; solid and liquid state effects

Pietsch, W.; Hauser, U.; Neuwirth, Wolfgang

doi:10.1016/0029-554x(76)90714-x

Cited by 73 publications

(9 citation statements)

References 8 publications

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“…In a systematic DSA study on many elemental metal backings, Broude and collaborators [126][127][128] found variations of the deduced life times by more than a factor of 2 when adopting the uncorrected LSS theory. A similar result was obtained by the Cologne group [129,130] who used the decay of the first excited 115 fs state in 7 Li populated in the reaction 10 B(n th ,a) with thermal neutrons to study the electronic stopping power in many boron compounds and 10 B-doped elements. Figure 23 collects the quantity S = (dE/dx)JN 2 at the velocity v = v 0 deduced from these inverted DSA experiments; N 2 is the atomic density Unauthenticated Download Date | 6/13/16 9:10 AM of the stopper and Z 2 its element number.…”

Section: The Doppler Shift Attenuation Methodssupporting

confidence: 70%

“…Figure 23 collects the quantity S = (dE/dx)JN 2 at the velocity v = v 0 deduced from these inverted DSA experiments; N 2 is the atomic density Unauthenticated Download Date | 6/13/16 9:10 AM of the stopper and Z 2 its element number. The pronounced Z 2 oscillations of S are not accounted for by the LSS theory (dashed line), but are better reproduced by HartreeFock-Salter potential calculations (solid line) [130]. Recently, the "universal" interatomic potential by Ziegler, Biersack and Littmark [131] (ZBL) has found wide application in DSA analyses.…”

Section: The Doppler Shift Attenuation Methodsmentioning

confidence: 96%

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12 The Measurement of Nuclear Lifetimes

1997

Experimental Techniques in Nuclear Physics

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Table of Contents I. Scope and definitions 425 II. Decay constants of "rare" decays 427 A. Very long lifetimes 427 B. Very small activities 428 C. Precision studies of the neutron lifetime 434 III. Direct timing methods (10~6 > τ > 10" 15 s) 437 A. Electronic and pulsed beam timing methods 437 B. Recoil shadow timing methods 445 C. The recoil distance "plunger" method 447 D. The Doppler shift attenuation method 453 E. The GRID method 466 IV. Measurement of very short lifetimes (τ < 10" 15 s) 472 A. X-ray timing 473 B. Crystal blocking 474 C. Nuclear resonance fluorescence 475 D. Determination of narrow resonance widths 478 References 482 I. Scope and definitionsThe decay modes of ground states and the low-lying nuclear states up to about 10 MeV excitation energy via ß-decay, electromagnetic radiations, particle emission and/or fission have been extensively studied for many decades. In all domains of nuclear structure investigations, the measurement of absolute decay probabilities and nuclear lifetimes has given important insight into the facets of nuclear many-body systems and has provided detailed data for in-depth tests of nuclear models. Some of these decay modes involve fundamentally known interactions, e.g. the electro-weak interaction in the case of β-and γ-decay processes, and thus are directly sensitive to the nuclear model wave functions to be tested. Other processes like nucleon emission, α-decay and fission are more difficult to deal with theoretically, as here the wave functions of the nuclear states involved in the transition and the nuclear transition operator, which both determine the decay probabilities, depend on the model used.The experimentally accessible range of nuclear lifetimes covers more than forty-five (!) orders of magnitude. When just considering α-decays, we have, on the one hand, the Unauthenticated Download Date | 6/13/16 9:10 AM

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Section: The Doppler Shift Attenuation Methodssupporting

confidence: 70%

Section: The Doppler Shift Attenuation Methodsmentioning

confidence: 96%

12 The Measurement of Nuclear Lifetimes

1997

Experimental Techniques in Nuclear Physics

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“…The dashed curves are obtained from TRIM90, TRIM92, TRIM95 [24] and HU90 [43]. The letters are the experimental data taken from Sa91 [57], Se60 [70], Wr79 [28], Ay82 [58], Ku 88 [54], Po61a [26], Ta83 [68], Ab91 [59], Ant91 [60], Ab93 [51], Pt76 [71], Tp62 [69], and Nd77 [56].…”

Section: Results and Comparison With Experimentsmentioning

confidence: 99%

Effective stopping charges and stopping power calculations for heavy ions

Gümüş

Köksal

2002

Radiation Effects and Defects in Solids

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In this study the model suggested by Sugiyama has been developed and applied for the calculation of the stopping powers for nonrelativistic heavy ions in various target materials. Sugiyama's model has been expanded to low and high energy regions in our work. Analytical expressions are obtained in the modified BB stopping power formula for the effective charge and effective mean excitation energies. In the modified LSS formula, a quasi-molecule criterion has been applied to both the projectiles and the target atoms. Electronic excitation contribution, S e0 , and quasi-molecule contribution, S ei , to stopping power were found for a wide energy region. It is observed that in intermediate energy region both contributions have maxima. The stopping power due to excitation-ionization in the intermediate and higher energy region is found to be dominant, whereas quasi-molecule contribution is dominant in the lower energy region. The calculated results of stopping power are in good agreement with experimental data for various ions and targets within a few percent in a wide projectile energy range.

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“…Omitting the point from Ref. [12] we are left with only few data sets which, however, are compatible with reciprocity. Figs.…”

Section: Figs 3 and 4 Show Stopping Cross Sections Involving Carbon mentioning

confidence: 89%

“…Within the adopted energy range, straight averaging leads to a rather steep slope for C in Nb which would indicate a pronounced deviation from reciprocity. While the difference in absolute magnitude between the two data sets Zh98b [11] and Pt76 [12] is likely to originate in sample properties, the data in Ref. [11] form a reasonable basis to define the slope.…”

Section: Figs 3 and 4 Show Stopping Cross Sections Involving Carbon mentioning

confidence: 99%