Alpha-decay spectroscopy of $$^{257}$$Rf

K Hauschild,V I Chepigin,O N Malyshev,J Piot,B Andel,A G Popeko,Yu A Popov,A A Kuznetsova,R Chakma,A I Svirikhin,M L Chelnokov,I N Izosimov,A V Yeremin,D E Katrasev,K Kessaci,M S Tezekbayeva,E A Sokol,O Dorvaux,D Ackermann,А Лопез-Мартенс ,P Mošať ,Б Галл ,Zouhair Asfari ,А В Исаев

doi:10.1140/epja/s10050-021-00657-8

Alpha-decay spectroscopy of $$^{257}$$Rf

K Hauschild, V I Chepigin + Show 22 more

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https://doi.org/10.1140/epja/s10050-021-00657-8

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Journal: The European physical journal. A, Hadrons and nuclei	Publication Date: Jan 1, 2022
Citations: 6

Affiliation: French National Centre for Scientific Research, Institut National de Physique Nucléaire et de Physique des Particules, University of Paris-Saclay, Institut Polytechnique de Paris, FLNR, JINR, Dubna State University, GANIL, Comenius University Bratislava, University of Strasbourg, National Nuclear Center of the Republic of Kazakhstan

#M1 Transition #Ground State + Show 8 more

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Abstract

The decay properties of the ground state and excited states of $^{257}$Rf have been investigated with the detector array GABRIELA at the FLNR, Dubna. The electromagnetic decay of a new excited state in $^{253}$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 $^{257}$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 $^{253}$No.

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