Comparison of calculated atomic stopping-power oscillations with apparent fluctuations in measured nuclear lifetimes

Journal Article · Thu Apr 01 04:00:00 EST 1976 · Phys. Rev., A, v. 13, no. 4, pp. 1370-1380

DOI:https://doi.org/10.1103/PhysRevA.13.1370· OSTI ID:4023318

Latta, B M; Scanlon, P J

Reported measurements by Broude et al. of the lifetime of the 3.34-MeV nuclear state in $sup 22$Ne, determined by Doppler-shift measurements on the $gamma$ decay of the excited nucleus as it is slowed down by various absorbers, show an oscillatory structure that can be attributed to oscillations in the electronic stopping cross section (S/sube/) of the absorbers. Unlike previously observed oscillations in S/sube/, which were for channeled or forward-scattered particles, these are oscillations in the average value of S/sube/. We have considered the problem in terms of an extension of the Lindhard-Scharff-Winther (LSW) theory to low-velocity heavy ions. We find that in the LSW formalism the appropriate effective charge for the projectile is not simply related to conventional equilibrium charge distributions, for velocities corresponding to those in the nuclear lifetime measurements. Despite this, it is possible to obtain relative stopping powers, at a given velocity, which are strongly correlated with the apparent oscillations in the value of the nuclear lifetime. (AIP)

• Research Organization: Department of Physics, Queen's University, Kingston, Ontario, Canada K7L 3N6
• Sponsoring Organization: USDOE
• NSA Number: NSA-33-031044
• OSTI ID: 4023318
• Journal Information: Phys. Rev., A, v. 13, no. 4, pp. 1370-1380, Journal Name: Phys. Rev., A, v. 13, no. 4, pp. 1370-1380; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

*NEON 22-- STOPPING POWER
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Molecular & Chemical Physics--Beams & Their Reactions
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ATOM-ATOM COLLISIONS
ATOMIC NUMBER
CHARGED-PARTICLE TRANSPORT
DENSITY
DOPPLER EFFECT
ENERGY LOSSES
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Ion & Molecular Beams & Reactions
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RANGE