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HK: Hadronen und Kerne

HK 50: Spectroscopy: 130 ≤ A ≤ 180

HK 50.5: Vortrag

Mittwoch, 18. März 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. Wrzesinski² — ¹Institut 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)