Experimental study of $^{100}$Tc $\beta$ decay with total absorption $\gamma$-ray spectroscopy

V. Guadilla , A. Algora , J.L. Tain , J. Agramunt , D. Jordan , A. Montaner-Pizá , S.E.A. Orrigo , B. Rubio , E. Valencia , J. Suhonen , O. Civitarese , J. Äystö , J.A. Briz (1) , A. Cucoanes (1) , T. Eronen , Magali Estienne (1) , Muriel Fallot (1) , L.M. Fraile , E. Ganioglu , W. Gelletly , D. Gorelov , J. Hakala , A. Jokinen , A. Kankainen , V. Kolhinen , J. Koponen , M. Lebois (2) , T. Martinez , M. Monserrate , I. Moore , E. Nácher , H. Penttilä , I. Pohjalainen , Amanda Porta (1) , J. Reinikainen , M. Reponen , S. Rinta-Antila , K. Rytkönen , T. Shiba (1) , V. Sonnenschein , A.A. Sonzogni , V. Vedia , A. Voss , J.N. Wilson (2) , A.-A Zakari-Issoufou (1)

1 SUBATECH - Laboratoire de physique subatomique et des technologies associées
2 IPNO - Institut de Physique Nucléaire d'Orsay

The β decay of Tc100 has been studied by using the total absorption γ-ray spectroscopy technique at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. In this work the new Decay Total Absorption γ-ray Spectrometer in coincidence with a cylindrical plastic β detector has been employed. The β intensity to the ground state obtained from the analysis is in good agreement with previous high-resolution measurements. However, differences in the feeding to the first-excited state as well as weak feeding to a new level at high excitation energy have been deduced from this experiment. Theoretical calculations performed in the quasiparticle random-phase approximation framework are also reported. Comparison of these calculations with our measurement serves as a benchmark for calculations of the double β decay of Mo100.

Mots clés: technetium: semileptonic decay; total-absorption counter; gamma ray; ground state; random phase approximation: quasiparticle; molybdenum: double-beta decay; excited state: energy; ruthenium; branching ratio; density; spectrometer; efficiency; benchmark; phonon; Monte Carlo; numerical calculations; experimental results

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

V. Guadilla, A. Algora, J.L. Tain, J. Agramunt, D. Jordan, et al.. Experimental study of $^{100}$Tc $\beta$ decay with total absorption $\gamma$-ray spectroscopy. Phys.Rev.C, 2017, 96 (1), pp.014319. ⟨10.1103/PhysRevC.96.014319⟩. ⟨hal-01645535⟩