Phys.Rev. C 107, 064312 (2023)

H.Kokkonen, K.Auranen, J.Uusitalo, S.Eeckhaudt, T.Grahn, P.T.Greenlees, P.Jones, R.Julin, S.Juutinen, M.Leino, A.-P.Leppanen, M.Nyman, J.Pakarinen, P.Rahkila, J.Saren, C.Scholey, J.Sorri, M.Venhart

Properties of the new α-decaying isotope ¹⁹⁰At

RADIOACTIVITY ¹⁹⁰At(α)[from ¹⁰⁹Ag(⁸⁴Sr, 3n), E=380, 390 MeV, followed by the separation of reaction products using the gas-filled recoil separator RITU at the K-130 cyclotron of the University of Jyvaskyla]; measured fusion-evaporation residues, (implants)α-correlated events, Eα, T_1/2 of ¹⁹⁰At decay, protons using the GREAT spectrometer with multiwire proportional counter (MWPC) and double-sided silicon strip detectors (DSSD). ¹⁹⁰At; deduced new isotope, Jπ for the ground state, Q(α), mass excess, Q(p), reduced decay width and α-decay hindrance factor using Rasmussen method, no evidence for the observation of protons; discussed logistics of proton emission from the decay of ¹⁹⁰At. Systematics of experimental ground-state α-decay energies Q(α) of ^{105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124}At, and compared with predictions from various mass models.

doi: 10.1103/PhysRevC.107.064312