Phys.Rev. C 104, 044617 (2021)

T.Niwase, M.Wada, P.Schury, P.Brionnet, S.D.Chen, T.Hashimoto, H.Haba, Y.Hirayama, D.S.Hou, S.Iimura, H.Ishiyama, S.Ishizawa, Y.Ito, D.Kaji, S.Kimura, J.Liu, H.Miyatake, J.Y.Moon, K.Morimoto, K.Morita, D.Nagae, M.Rosenbusch, A.Takamine, T.Tanaka, Y.X.Watanabe, H.Wollnik, W.Xian, S.X.Yan

α-decay-correlated mass measurement of ^{206, 207g, m}Ra using an α-TOF detector equipped multireflection time-of-flight mass spectrograph system

ATOMIC MASSES ^206,207,207mRa; measured time-of-flight spectra by α-decay-correlated mass spectroscopy using multireflection time-of-flight mass spectrograph (MRTOF-MS) system, with an α-TOF detector at SHE-Mass-II facility of RIBF-RIKEN; deduced mass excesses, and compared with evaluated data in AME2020. ^207mRa; deduced excitation energy of the isomer, J, π. ^206,207,207mRa isotopes produced in ¹⁵⁹Tb(⁵¹V, X), E=306 MeV, followed by separation of evaporation residues using recoil ion separator GARIS-II at RIKEN.

RADIOACTIVITY ^206,207mRa(α)[from ¹⁵⁹Tb(⁵¹V, X), E=306 MeV at RIBF-RIKEN]; measured Eα, Iα, T_1/2 of decays of ²⁰⁶Ra and ^207mRa, excitation energy of the isomer; deduced α-reduced width, configuration. Systematics of spins, parities, Eα, T_1/2, α-branching ratios, reduced α widths for ^{203,203m,205,205m,207,207m}Ra. ^198,199Po, ^202,203At, ^202,203Rn, ^206,207Fr, ²⁰⁷Ra; observed α spectra from decays.

doi: 10.1103/PhysRevC.104.044617