An experimental search for 𝛼 and 2𝛼 decays of naturally occurring europium isotopes, 151Eu and 153Eu, was carried out at the Gran Sasso underground laboratory using a 313.8 g highly radiopure sample of europium oxide and a 118 cm3 broad-energy HPGe detector. In the spectrum measured over 4211 h, no 𝛾 peaks expected from the processes of interest were observed. Improved partial half-life limits were set for the 𝛼 decays of 151Eu to the 91.1-keV daughter level and 153Eu to all energetically allowed levels: > 4.0 × 1018 y and > 1.6 × 1018 y, respectively, at 90% C.L. The first experimental limits were obtained for 2𝛼 decay of 151Eu (> 5.0 × 1011 y) and 153Eu (> 2.6 × 1017 y).
Belli, P., Bernabei, R., Boiko, R.s., Cappella, F., Caracciolo, V., Cerulli, R., et al. (2027). Search for alpha and double-alpha decays of naturally occurring europium isotopes with HPGe gamma spectrometry. NUCLEAR PHYSICS. A, 1077 [10.1016/j.nuclphysa.2026.123515].
Search for alpha and double-alpha decays of naturally occurring europium isotopes with HPGe gamma spectrometry
Bernabei, R.
;Caracciolo, V.;
2027-01-01
Abstract
An experimental search for 𝛼 and 2𝛼 decays of naturally occurring europium isotopes, 151Eu and 153Eu, was carried out at the Gran Sasso underground laboratory using a 313.8 g highly radiopure sample of europium oxide and a 118 cm3 broad-energy HPGe detector. In the spectrum measured over 4211 h, no 𝛾 peaks expected from the processes of interest were observed. Improved partial half-life limits were set for the 𝛼 decays of 151Eu to the 91.1-keV daughter level and 153Eu to all energetically allowed levels: > 4.0 × 1018 y and > 1.6 × 1018 y, respectively, at 90% C.L. The first experimental limits were obtained for 2𝛼 decay of 151Eu (> 5.0 × 1011 y) and 153Eu (> 2.6 × 1017 y).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
