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論文

New $$beta$$-decaying state in $$^{214}$$Bi

Andel, B.*; Van Duppen, P.*; Andreyev, A. N.; Blazhev, A.*; Grawe, H.*; Lica, R.*; Na$"i$dja, H.*; Stryjczyk, M.*; 他52名*

Physical Review C, 104(5), p.054301_1 - 054301_13, 2021/11

https://doi.org/10.1103/PhysRevC.104.054301
 被引用回数：1 パーセンタイル：18.91(Physics, Nuclear)

A new $$beta$$-decaying state in $$^{214}$$Bi has been identified at the ISOLDE Decay Station at the CERN-ISOLDE facility. A preferred $$I^{pi} = (8^{-})$$ assignment was suggested for this state based on the $$beta$$-decay feeding pattern to levels in $$^{214}$$Po and shell-model calculations. The half-life of the $$I^{pi} = (8^{-})$$ state was deduced to be $$T_{1/2} = 9.39 (10)$$ min. The deexcitation of the levels populated in $$^{214}$$Po by the $$beta$$ decay of this state was investigated via $$gamma-gamma$$ coincidences and a number of new levels and transitions were identified. Shell-model calculations for excited states in $$^{214}$$Bi and $$^{214}$$Po were performed using two different effective interactions: the H208 and the modified Kuo-Herling particle interaction. Both calculations agree on the interpretation of the new $$beta$$-decaying state as an $$I^{pi} = 8^{-}$$ isomer and allow for the tentative assignment of shell-model states to several high-spin states in $$^{214}$$Po.

論文

Competition between allowed and first-forbidden $$beta$$ decay; The Case of $$^{208}$$Hg $$rightarrow$$ $$^{208}$$Tl

Carroll, R. J.*; Podoly$'a$k, Zs.*; Berry, T.*; Grawe, H.*; Alexander, T.*; Andreyev, A. N.; Ansari, S.*; Borge, M. J. G.*; Brunet, M.*; Creswell, J. R.*; et al.

Physical Review Letters, 125(19), p.192501_1 - 192501_6, 2020/11

https://doi.org/10.1103/PhysRevLett.125.192501
 被引用回数：9 パーセンタイル：62.22(Physics, Multidisciplinary)

The $$beta$$ decay of $$^{208}$$Hg into the one-proton hole, one neutron-particle $$^{208}_{81}$$Tl$$_{127}$$ nucleus was investigated at CERN-ISOLDE. Shell-model calculations describe well the level scheme deduced, validating the proton-neutron interactions used, with implications for the whole of the $$N > 126$$, $$Z < 82$$ quadrant of neutron-rich nuclei. While both negative and positive parity states with spin 0 and 1 are expected within the $$Q_{beta}$$ window, only three negative parity states are populated directly in the $$beta$$ decay. The data provide a unique test of the competition between allowed Gamow-Teller and Fermi, and first-forbidden $$beta$$ decays, essential for the understanding of the nucleosynthesis of heavy nuclei in the rapid neutron capture process. Furthermore, the observation of the parity changing $$0^{+} rightarrow 0^{-} beta$$ decay where the daughter state is core excited is unique, and can provide information on mesonic corrections of effective operators.

論文

Transition strengths in the neutron-rich $$^{73,74,75}$$Ni isotopes

Gottardo, A.*; De Angelis, G.*; Doornenbal, P.*; Coraggio, L.*; Gargano, A.*; Itaco, N.*; Orlandi, R.; 他52名*

Physical Review C, 102(1), p.014323_1 - 014323_8, 2020/07

https://doi.org/10.1103/PhysRevC.102.014323
 被引用回数：8 パーセンタイル：69.78(Physics, Nuclear)

Reduced transition probabilities have been measured for the neutron-rich $$^{73,74,75}$$Ni nuclei with relativistic Coulomb excitation performed at the RIKEN Nishina Center. Excitation energies compare well with the result of large-scale shell-model calculations, while $$B(E2)$$ values are larger than predicted. This could indicate an increasing contribution of proton excitations across the $$Z=28$$ shell closure when approaching $$^{78}$$Ni.

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