We present evidence for a new supersymmetric quartet in the A ∼ 190 region of the nuclear mass table. New experimental information on transfer and neutron capture reactions to the odd-odd nucleus 194 Ir strongly suggests the existence of a new supersymmetric quartet, consisting of the 192,193 Os and 193,194 Ir nuclei. We make explicit predictions for the odd-neutron nucleus 193 Os and suggest that its spectroscopic properties be measured in dedicated experiments.

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The structure of 194 Ir is investigated via (n, γ ), (n, e − ), (d, p), and ( d, α) spectroscopy. The use of different methods leads to an almost complete level scheme up to high excitation energies including γ -decay and spin-parity assignments. A reanalysis of the formerly published (n, γ ) data was triggered by our new (d, p) and ( d, α) transfer reactions. The experimental level scheme is compared to predictions using extended supersymmetry. Herein, the classification of states was done according to quantum numbers, excitation energies, and ( d, α) transfer strengths. A one-to-one correspondence in excitation energies was obtained for the 23 lowest lying theoretical states with similar structures for the experimental and calculated level schemes. The two-nucleon transfer strengths show remarkable agreement. A Nilsson classification is discussed as well. PACS number(s): 21.10. Jx, 23.20.Lv, 21.60.Ev, 27.80.+w * Corresponding author. wirth@tum.de classification and then the extended supersymmetry approach. Finally, Sec. V gives our conclusions. II. EXPERIMENTAL DATA A. Transfer reactions 1. 193 Ir(d, p) 194 Ir measurement Proton spectra of the reaction 193 Ir(d, p) 194 Ir were recorded at the three angles 20 • , 40 • , and 60 • . The target consisted of 130 µg/cm 2 enriched 193 Ir (99%) evaporated on a 5 µg/cm 2 0556-2813/2008/77(6)/064602(25) 064602-1

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