First evidence for chirality in Tc isotopes: Spectroscopy of 100Tc
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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.
PACS.21.10.Re Collective levels 21.60.-n Nuclear structure models and methods 23.20.Lv γ transitions and level energies 27.60.+j 90 ⩽ A ⩽ 149
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