Nuclear Technology and Radiation Protection 2023 Volume 38, Issue 4, Pages: 253-257
https://doi.org/10.2298/NTRP2304253M
Full text (
660 KB)
A simple analytical approach to deal with unobserved feeding in lifetime measurements using a plunger method
Milanović Tamara J. 
(Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia)
Čeliković Igor T. (Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia), icelikovic@vin.bg.ac.rs
Determination of lifetime of low-lying states using a plunger method could be
a subject of systematic uncertainty if, among else, correction of
unobserved feeding is not properly taken into account. In this paper, a
simple analytical approach is proposed to deduce a lifetime of the state of
interest if fed directly by observed and unobserved feedings. Evolution of
population of the state of interest for 10 target-degrader distances was
simulated, using Monte Carlo approach, assuming a decay scheme of three
populated states (a state of interest, one observed and one unobserved
state). The simulation was performed using a wide range of initial conditions (lifetimes and detection efficiencies of the three states). A fit on
simulated evolution of investigated state using analytical solution of
described model (by fixing known parameters from direct, observed feeding:
initial population and lifetime) successfully reproduced desired lifetime.
In order to successfully apply the method, it is necessary to have
experimentally available intensities of unshifted components of peak from at
least five target-degrader distances.
Keywords: lifetime measurement, unobserved feeding, simulation
Project of the Ministry of Science, Technological Development and Innovation, Republic of Serbia, Grant no. 451-03-66/2024-03/200017
Show references
Bohr, A., Mottelson, B. R., Nuclear Struture, vol. II, World Scientific, Singapore, 2010
Heyde, K., Wood, J. L., Shape Coexistence in Atomic Nuclei, Reviews of Modern Physics, 83 (2011), 1655, pp. 1467-1521
Dewald, A., et al., Developing the Recoil Distance Doppler-Shift Technique Towards a Versatile Tool for Lifetime Measurements of Excited Nuclear States, Progress in Particle and Nuclear Physics, 67 (2012), 3, pp. 786-839
Dewald, A., et al., The Differential Plunger and the Dif- ferential Decay Curve Method for the Analysis of Recoil Distance Doppler-Shift Data, Zeitschrift für Physik A Atomic Nuclei, 334 (1989), June, pp. 163-175
Louchart, C., et al., Collective Nature of Low-Lying Excitations in 70,72,74Zn from Lifetime Measurements Using the AGATASpectrometer Demonstrator, Physical Review C, 87 (2013), 054302
Čeliković, I., et al., Lifetime Measurements of Zn Isotopes Around N = 40, Acta Physica Polonica. B 44 (2013), 3, pp. 375-380
Milanovi}, T., et al., Lifetime Measurements of Low-Lying States in 73Ga and 70,72,74Zn Isotopes, Acta Physica Polonica. B 51 (2020), 3, pp. 837-842
Van de Walle, J., et al., Low-Energy Coulomb Excitation of Neutron-Rich Zinc Isotopes, Physical Review C, 79 (2009), 014309
Hellgartner, S., et al., Axial and Triaxial Degrees of Freedomin 72Zn, Physics Letters B, 841 (2023), 137933
Illana, A., et al., Coulomb Excitation of 74,76Zn, Physical Review C, 108 (2023), 044305
Grahn, T., et al., Lifetimes of Intruder States in 186Pb, 188Pb, and 194Po, Nuclear Physics A, 801 (2008), July, pp. 83-100
Grahn, T., et al., Collectivity of 196Po at Low Spin, Physical Review C, 80 (2009), 014323
Klinterfjord, M., et al., Measurement of Lifetimes in 62,64Fe, 61,63Co, and 59Mn, Phys. Rev., C 95 (2017), 024312
Petkov, P., Muller-Gatermann, C., Simple New Methods for Deducing Lifetimes in Recoil Distance Doppler-Shift Measurements, Review of Scentific Instru- ments, 93 (2022), 3, 033301