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Lifetimes of Low Lying Levels of 18O, 18Ne

Publication: Canadian Journal of Physics
August 1974

Abstract

The T(16O,p)18O reaction has been employed to measure the lifetimes of the 1.98 MeV 2+ level (τ = 3.35 ± 0.20 ps) and the 3.55 MeV 4+ level (τ = 24.5 ± 3.3 ps) of 18O by the recoil distance method. The lifetime of the 1.89 MeV 2+ level of 18Ne (τ = 0.63 ± 0.13 ps) has been measured by observing the Doppler shift attenuation of γ rays from 18Ne ions recoiling from the 16O(3He,n) reaction into Y and Ta backings. Transition rates in these mirror nuclei are compared with theoretical predictions.

Résumé

On a utilisé la réaction T(16O,p)18O pour mesurer les vies moyennes des niveaux 1.98 MeV 2+ (τ = 3.35 ± 0.20 ps) et 3.55 MeV 4+ (τ = 24.5 ± 3.3 ps) de 18O par la méthode de distance de recul. La vie moyenne du niveau 1.89 MeV 2+ de 18Ne (τ = 0.63 ± 0.13 ps) a été mesurée en observant l'atténuation de l'effet Doppler des rayons γ des noyaux 18Ne en recul dans Y et Ta après réaction 16O(3He,n). Les taux de transition obtenus pour les noyaux miroirs 18O et 18Ne sont comparés avec les prédictions de la théorie. [Traduit par le journal]

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cover image Canadian Journal of Physics
Canadian Journal of Physics
Volume 52Number 15August 1974
Pages: 1381 - 1388

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Version of record online: 5 September 2011

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A. B. McDonald
Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, K0J 1J0
T. K. Alexander
Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, K0J 1J0
O. Häusser
Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, K0J 1J0
G. J. Costa
Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, K0J 1J0
J. S. Forster
Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, K0J 1J0
A. Olin
Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, K0J 1J0

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Cited by

1. A DBLA measurement of the lifetime of the first excited level in 18O and a critical comparison of lifetime results by different methods
2. Sum-rule approach to the static quadrupole moments of arbitrary excited states in even-even nuclei
3. Nuclear sum rules and the quadrupole moment of the 1.98 MeV state of 18O
4. Electric moments of the first excited state of 18O
5. Electronuclear energy weighted sum rules and the quadrupole moments of excited states of nuclei
6. Lifetime Measurements of Excited Nuclear Levels by Doppler-Shift Methods
7. Quadrupole Moment of the First Excited 2+ State of O18
8. Determination of the Static Quadrupole Moment of the 1.98-MeV 2+ State in O18
9. High-velocity DSA measurements in the 1–20 ps lifetime region: Comparison between DSA and RD
10. Admixtures of Shell and Cluster States in 18O
11. Nuclear coexistence in 18O
12. The quadrupole moment of the first excited state of 18 O
13. Structure of low-lying positive-parity states of O18
14. A high-velocity recoil-in-vacuum determination of the g-factor and lifetime of the 1.97 MeV 2 + level in 18 O
15. Lifetime of the 1.89 MeV 2+ level of 18Ne: Two-body contributions to E2 transition rates
16. Precision lifetime measurements with the coincident high-velocity DSA method in inverse reactions
17. Measurement of the Quadrupole Moment of the First Excited 2+ State of O18
18. Hyperfine interactions of highly stripped oxygen ions recoiling in helium
19. The magnetic moment of the first-excited 2+ state in 18O

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