Abstract
Theβ-decay energy of the neutron-rich isotopes148Ba,148La and151Pr has been measured at the Institute Laue-Langevin (ILL). The148Ba- and148La-nuclei were produced using a high-temperature ion source at the OSTIS separator of this institute, whereas samples of151Pr were obtained from the thermal fission of239Pu, used as a target in the mass separator LOHENGRIN. At both instruments,βγ-coincidences were measured with a plastic scintillator telescope and a Ge(I)-detector, together withβ-singles andγ-singles spectra. Theβ-spectra emitted in coincidence with 44γ-lines in the decay of these nuclei have been evaluated. From their endpoint energies, the followingQ β -values have been obtained:Q β (148Ba)=5115±60keV;Q β (148La)=7255±55 keV;Q β (151Pr)=4170±75 keV. Using these results, the nuclear massesA of these nuclei can be calculated with a relative error ΔA/A≃5·10−7. In addition, the two-neutron separation energies and the mass excesses have been derived; the results are compared with recent predictions of theoretical mass calculations.
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This work has been funded by the German Minister for Research and Technology under contract number 06BS452I
We wish to thank Mrs. Ch. Laupheimer for her help in the preparation of the manuscript. The support from the technical staff of the ILL is gratefully acknowledged.
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Graefenstedt, M., Jürgens, P., Keyser, U. et al. Beta decay energies and nuclear masses of148Ba,148La and151Pr. Z. Physik A - Atomic Nuclei 336, 247–252 (1990). https://doi.org/10.1007/BF01292853
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DOI: https://doi.org/10.1007/BF01292853