Eur. Phys. J. A (2005) 24: 23-29
https://doi.org/10.1140/epja/i2004-10120-y

First evidence for chirality in Tc isotopes: Spectroscopy of ¹⁰⁰Tc

¹ Department of Physics, University of York, York YO10 5DD, Heslington, UK
² Department of Physics and Astronomy, SUNY at Stony Brook, NY 11794-3800, Stony Brook, USA
³ Department of Physics, University of Liverpool, L69 7ZE, Liverpool, UK
⁴ Department of Physics and Astronomy, Michigan State University, 164 S. Shaw lane, MI 48824-132, East Lansing, USA

^* e-mail: pj9@npg.york.ac.uk

Received: 17 November 2004
Accepted: 22 December 2004
Published online: 28 January 2005

Abstract

Excited states in ¹⁰⁰Tc have been studied using the ⁹⁶Zr( ⁷Li, 3n) reaction at a beam energy of 27 MeV. In the present work, evidence has been found for a second ΔI = 1 band decaying via several stretched dipole transitions to the previously known ΔI = 1 negative-parity band. Comparison of these data with those in neighbouring nuclei and also against recently reported criteria for chiral bands in nuclei, suggests that the two structures can be interpreted as chiral partners. Core quasi-particle coupling model calculations show reasonable agreement with the data and generally support the chiral interpretation of the states.