Alpha-decay spectroscopy of $^{257}$Rf
K. Hauschild, A. Lopez-Martens, R. Chakma, O. Dorvaux, B. Gall, M.L., Chelnokov, V.I. Chepigin, A.V. Isaev, I.N. Izosimov, D.E. Katrasev, A.A., Kuznetsova, O.N. Malyshev, A.G. Popeko, Yu.A. Popov, E.A. Sokol, A.I., Svirikhin, A.V. Yeremin, D. Ackermann, J. Piot, P. Mosat
TL;DR
This study investigates the decay properties of $^{257}$Rf and reports the discovery of a new excited state in $^{253}$No, providing insights into nuclear structure and decay mechanisms.
Contribution
The paper reports the first observation of an electromagnetic decay from a new excited state in $^{253}$No, linked to the decay of $^{257}$Rf, offering new understanding of nuclear configurations.
Findings
Discovery of a new excited state in $^{253}$No at 750 keV
Observation of an M1 transition to the ground state
Implication for reinterpretation of high-K isomer decay in $^{253}$No
Abstract
The decay properties of the ground state and excited states of Rf have been investigated with the detector array GABRIELA at the FLNR, Dubna. The electromagnetic decay of a new excited state in No has been observed. The state lies 750 keV above the ground state and is favourably populated in the alpha decay of the low-lying spin isomer of Rf. It decays to the 9/2 ground state by an M1 transition and is assigned the 11/2[725] Nilsson configuration. The presence of this state suggests a possible reinterpretation of the decay of the high-K isomer in No.
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