Eur. Phys. J. A (2004) 22: 157-161
https://doi.org/10.1140/epja/i2004-10090-0

New spins for ground states and isomers in ¹¹⁵Pd and ¹¹⁷Pd

¹ Faculty of Physics, Warsaw University, ul. Hoża 69, PL-00-681, Warsaw, Poland
² Institut Laue-Langevin, F-38042, Grenoble Cedex, France
³ Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-CNRS/Université J. Fourier, F-38026, Grenoble Cedex, France
⁴ Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, M13 9PL, Manchester, UK
⁵ Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3, Université Louis Pasteur, F-67037, Strasbourg, France
⁶ Argonne National Laboratory, 60439, Argonne, IL, USA

^* e-mail: urban@fuw.edu.pl

Received: 6 September 2004
Accepted: 18 October 2004
Published online: 9 November 2004

Abstract

Levels in ¹¹⁵Pd and ¹¹⁷Pd nuclei, populated in the spontaneous fission of ²⁴⁸Cm were studied by means of prompt gamma spectroscopy using the EUROGAM2 array of Anti-Compton spectrometers. Negative-parity, I = 9/2 excitations were identified, which are associated with the long-lived isomers in these nuclei, reported previously as 11/2^- excitations. The new data indicate spin and parity 3/2⁺ for ground states in ¹¹⁵Pd and ¹¹⁷Pd instead of 5/2⁺ proposed in previous works. This result implicates changes of spin assignments to other levels in both nuclei.