Eur. Phys. J. A (2006) 29: 175-182
https://doi.org/10.1140/epja/i2006-10074-0

Nuclear Structure and Reactions

Beta decay of ⁹⁴Pd and of the 71 s isomer of ⁹⁴Rh

¹ St. Petersburg Nuclear Physics Institute, RU-188350, Gatchina, Russia
² Department of Physics of the University “Federico II”, I-80126, Napoli, Italy
³ Gesellschaft für Schwerionenforschung, D-64291, Darmstadt, Germany
⁴ University of Sofia, BG-1164, Sofia, Bulgaria
⁵ National Taras Shevchenko University of Kyiv, 01033, Kyiv, Ukraine
⁶ University of Seville, E-41012, Sevilla, Spain

^* e-mail: batist@pnpi.spb.ru

Received: 19 April 2006
Accepted: 25 July 2006
Published online: 29 August 2006

Abstract

The β decay of ⁹⁴Pd and of the 71s isomer of ⁹⁴Rh was investigated by using total γ-ray absorption techniques. Several levels in ⁹⁴Rh are established, including a new low-lying isomer characterized by a half-life of 0.48(3)μs and a de-exciting transition of 55keV. E2 multipolarity is determined for this transition by measuring the intensities of its γ-rays and the characteristic X-rays from its electron conversion. On the basis of the measured reduced β-decay transition rates to known ⁹⁴Ru levels and shell model considerations, the spin-parity of the 71s and the 0.48μs isomers of ⁹⁴Rh is assigned to be (4⁺) and (2⁺), respectively. The β-decay strength distributions measured for ⁹⁴Pd and the 71s isomer of ⁹⁴Rh yield Q _EC values of 6700(320) and 9750(320)keV for these decays and give evidence for the population of those states below and above the magic N = 50 gap that belong to both components of the 0g spin-orbit doublet.