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Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 50: Spectroscopy: 130 ≤ A ≤ 180

HK 50.5: Talk

Wednesday, March 18, 1998, 15:30–15:45, D

High-spin isomers in N = 82 nuclei — •K. Jessen1, P. von Brentano1, A. Dewald1, H. Meise1, L. Eßer1, C. Schumacher1, O. Stuch1, D. Weißhaar1, I. Wiedenhöver1, M. Bergström2, B. Herskind2, G. Sletten2, and J. Wrzesinski21Institut f"ur Kernphysik, Universit"at zu K"oln, Zülpicher Straße 77, D–50937 Köln, Germany — 2Niels Bohr Institute, University of Copenhagen, DK–4000 Roskilde, Denmark

An in-beam experiment with the reactions 122Sn(27Al,4nxp) at 127 MeV was performed at the Nordball multi-detector array in Roskilde. It provided evidence for high-spin isomers in 145Eu [1] and 144Sm, and their half-lives were measured by means of the centroid shift method. These isomers at about 8 MeV excitation energy with half-lives of a few ns correspond to similar states in the neighbouring nuclei 147Tb and 146Gd. We propose a systematics of related high-spin isomers in N = 82 nuclei, which is similar to the systematics for N = 83 nuclei recently given by Odahara et al. [2].

Partially supported by the DFG, project Br 799/8-1, and the Danish Natural Science Research Council.

[1] Jessen, K. et al., Z. Phys. A 357, 245 (1997)

[2] Odahara, A. et al., Nucl. Phys. A 620, 363 (1997)

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