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Nuclear levels in152Eu

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Zeitschrift für Physik A Atoms and Nuclei

Abstract

The transitional nucleus152Eu has been studied using the (n, e), (n, γ), (n res,γ), (n, γγ), (d, p), (d, t) and (p, d) reactions. The experiments have been performed at nine different laboratories. A model independent level scheme was established including 95 levels below 510 keV and nearly 900 transitions by combination of low energy transitions and reaction data. More than 20 additional levels result from gamma rays and/or charged particle reactions. The level scheme is interpreted in terms of the Nilsson model indicating that152Eu is a deformed nucleus. Seven rotational bands and Nilsson configurations are established. An additional 27 rotational bands are tentatively or speculatively assugned. Gallagher-Moszkowski splittings are discussed. The neutron binding energy was determined as 6305.2±0.5 keV. The energy of the 9.3 h 0 isomer is 45.599 keV. The lifetimes of four levels were measured.

Nuclear Reactions151Eu(n,γ),E n =thermal and resonance; measuredE γ ,I γ ,E c.e.,I c.e.,γγ Coinc.,γγΔt coinc.;151Eu(d, p),E=12MeV and 14MeV;153Eu(d, t),E=12MeV;153Eu(p, d),E =18MeV; deduced level scheme of152Eu,J, π, T 1/2,cc, Nilsson configurations. Magnetic electron spectrometer, curved crystal spectrometer, Ge(Li) and Si(Li) detectors, magnetic spectrographs. Enriched targets.

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We would like to thank Drs. D. Elmore, I. Hamamoto, P. Kleinheinz, K.E.G. Löbner, R. Piepenbring, G. Scharf-Goldhaber and G.L. Struble for fruitful discussions and calculations. J.U. is grateful for the hospitality of the Niels Bohr Institute and the financial assistance of the National Research Council (Canada). We appreciate the contribution of Dr. D. Rabenstein in the delayed coincidence measurements at Munich.

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von Egidy, T., Kaiser, W., Mampe, W. et al. Nuclear levels in152Eu. Z Physik A 286, 341–380 (1978). https://doi.org/10.1007/BF01408894

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