Isomer separation of Cu-70g and Cu-70m with a resonance ionization laser ion source
Köster, U × Fedoseyev, VN Mishin, VI Weissman, L Huyse, Marc Kruglov, K Mueller, WF Van Duppen, Piet Van Roosbroeck, Jan Thirolf, P Thomas, HG Weisshaar, D Schulze, W Borcea, R La Commara, M Schatz, H Schmidt, K Rottger, S Huber, G Sebastian, V Kratz, KL Catherall, R Georg, U Lettry, J Oinonen, M Ravn, HL Simon, H #
Elsevier science bv
Nuclear Instruments and Methods in Physics Research Section B: Interactions with materials and atoms vol:160 issue:4 pages:528-535
Radioactive copper isotopes were ionized with the resonance ionization laser ion sourer (RILIS) at the on-line isotope separator ISOLDE (CERN). Using the different hyperfine structure in the 3d(10) 4s S-2(1/2) - 3d(10)4p P-2(1/2)0 transition the low- and high-spin isomers of (CU)-C-70 were selectively enhanced by tuning the laser wavelength. The light was provided by a narrow-bandwidth dye laser pumped by copper vapor lasers (CVL) and frequency doubled in a BBO crystal. The ground state to isomeric state intensity ratio could be varied by a factor of 30, allowing to assign gamma transitions unambiguously to the decay of the individual isomers. It is shown that the method can also be used to determine magnetic moments. In a first experiment for the 1(+) ground state of Cu-70 a magnetic moment of (+)1.8(3) mu(N) and for the high-spin isomer of Cu-70 a magnetic moment of (+/-)1.2(3) mu(N) could be deduced. (C) 2000 Elsevier Science B.V. All rights reserved.