On the determination of collision cross sections by nuclear Doppler shift

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

doi:10.1007/bf01669060

Cited by 33 publications

(7 citation statements)

References 11 publications

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“…It was shown, especially in Ref. 2, that in this velocity range the stopping cross sections are linearly dependent on the velocity of the Li ions within the limits of error of the order of 1 ~ A further investigation of the velocity dependence of stopping cross sections was performed in an independent experiment [4]. Here we used targets consisting of metal foils with thin evaporated boron films where the boron films were so thin that the energy loss of the produced Li ions in boron was negligible.…”

Section: De/ds = M (Dr~dr)mentioning

confidence: 78%

“…cross section S is by definition connected with the differential energy loss dE/ds: (2) where N is the number density of the target substance and M the mass of the projectile. 2.…”

Section: De/ds = M (Dr~dr)mentioning

confidence: 99%

“…4. A further source of a systematic error is the lifetime of the excited state of 7Li*, which for this method determines the time scale of the measurement [1,2]. As, however, the lifetime is a common factor for all stopping cross sections for the same projectile, the relative accuracy is given by the reported errors, while the absolute values may contain a possible error in the lifetime which should be smaller than 4}o [1].…”

mentioning

confidence: 96%

“…2. Since we measure the stopping cross sections of 7Li ions which are produced by the reaction l~ ~)VLi* our targets must be substances which contain boron as a constituent, as an impurity, or as a solvent.…”

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confidence: 99%

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Electronic stopping cross sections of elements and compounds for swift Li ions

et al. 1975

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Abstract. We report on experimental electronic stopping cross sections of elements and compounds for Li ions. They are measured with the Inverted Doppler Shift Attenuation (IDSA) method with an accuracy of the order of 1 }o-In cases where comparable data from other authors exist, agreement within the limits of error is obtained. Systematic and pronounced deviations up to about 30% from Lindhard's theory are found. It turns out that Bragg's rule is generally not valid for stopping cross sections in the velocity range 1.5.108 cm/sec to 4.8 -l0 s cm/sec.

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Section: De/ds = M (Dr~dr)mentioning

confidence: 78%

“…cross section S is by definition connected with the differential energy loss dE/ds: (2) where N is the number density of the target substance and M the mass of the projectile. 2.…”

Section: De/ds = M (Dr~dr)mentioning

confidence: 99%

mentioning

confidence: 96%

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confidence: 99%

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Electronic stopping cross sections of elements and compounds for swift Li ions

et al. 1975

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“…That of 'Li in water which has been regarded as an appropriate value in BNCT was obtained semi-experimentally [3]. The hne shapes of the prompt y ray of 478 keV from were investigated by Neuwirth et al [4,5], relating the Doppler broadened line-shapes to the slowing-down processes of in matter. The present authors also measured and analyzed the prompt y ray using the neutron beam and the prompt y-ray analysis system [6,7] at the newly constructed JRR-3M reactor, Japan Atomic Energy Research Institute.…”

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confidence: 99%

Ranges of ⁷Li Produced in ¹⁰B(n,α)⁷*Li Reaction

et al. 1996

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Line shape of prompt y ray / Doppler broadening / '°B(n,a)^*Li reaction / Range oflA / Boron neutroncapture therapy AbstractThe ranges of 'Li and '*Li produced via the "'B(n,a)'*Li reaction in elementary boron and water were determined by analysis of the Doppler broadened line-shapes of the 478 IceV prompt yray from the shortlived '*Li (T = 1.05X10"" s). The spectral line-shapes of the prompt y rays were measured with a low background using neutron beams guided outside the reactor at JRR-3M. The ränge of 3.9 um estimated for 'Li in water is compared with that (4.8 um) used in boron neutron-capture therapy as an appropriate value.'"B(n,a)^*Li reaction. That of 'Li in water which has been regarded as an appropriate value in BNCT was obtained semi-experimentally [3]. The hne shapes of the prompt y ray of 478 keV from were investigated by Neuwirth et al. [4,5], relating the Doppler broadened line-shapes to the slowing-down processes of in matter. The present authors also measured and analyzed the prompt y ray using the neutron beam and the prompt y-ray analysis system [6,7] at the newly constructed JRR-3M reactor, Japan Atomic Energy Research Institute. In our analysis procedure, a parameter called "velocity degradation constant" D of was introduced. The ranges of ''*Li and 'Li were estimated using the D values determined experimentally.

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