Lifetime Measurements with the Doppler Shift Attenuation Method Using a Thick Homogeneous Production Target — Verification of the Method

Abstract : Doppler Shift Attenuation Method (DSAM) analysis of excited-state lifetimes normally employs thin production targets mounted on a thick stopper foil (“backing”) serving to slow down and stop the recoiling nuclei of interest in a well-defined manner. Use of a thick, homogeneous production target leads to a more complex analysis as it results in a substantial decrease in the energy of the incident projectile which traverses the target with an associated change in the production cross section of the residues as a function of penetration depth. Here, a DSAM lifetime analysis using a thick homogeneous target has been verified using the Doppler broadened lineshapes of γ rays following the decay of highly excited states in the semi-magic (N = 50) nucleus 94Ru. Lifetimes of excited states in the 94Ru nucleus have been obtained using a modified version of the LINESHAPE package from the Doppler broadened lineshapes resulting from the emission of the γ rays, while the residual nuclei were slowing down in the thick (6 mg/cm2) metallic 58Ni target. The results have been validated by comparison with a previous measurement using a different (RDDS) technique.
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Submitted on : Wednesday, April 18, 2018 - 1:07:20 PM
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A. Ertoprak, B. Cederwall, U. Jakobsson, B.M. Nyakó, J. Nyberg, et al.. Lifetime Measurements with the Doppler Shift Attenuation Method Using a Thick Homogeneous Production Target — Verification of the Method. The Zakopane Conference on Nuclear Physics “Extremes of the Nuclear Landscape”, Aug 2016, Zakopane, Poland. pp.325, ⟨10.5506/APhysPolB.48.325⟩. ⟨in2p3-01769762⟩

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