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論文

Identification of a 6.6$$mu$$s isomeric state in $$^{175}$$Ir

Gillespie, S. A.*; Andreyev, A. N.; Al Monthery, M.*; Barton, C. J.*; Antalic, S.*; Auranen, K.*; Badran, H.*; Cox, D.*; Cubiss, J. G.*; O'Donnell, D.*; et al.

Physical Review C, 99(6), p.064310_1 - 064310_6, 2019/06

 被引用回数:3 パーセンタイル:52.47(Physics, Nuclear)

An experiment has been performed to study excited states in the neutron-deficient nucleus $$^{175}$$Ir via the use of the JUROGAM II high-purity germanium detector array and the RITU gas-filled separator at JYFL, Jyv$"a$skyl$"a$. By using isomer tagging, an isomeric state with a half-life of 6.58(15) $$mu$$s has been observed in $$^{175}$$Ir for the first time. It has been established that the isomer decays via a 45.2 ($$E1$$) - 26.1 ($$M1$$) keV cascade to new states below the previously reported ground state in $$^{175}$$Ir with $$I^{pi} = (5/2^{-})$$. We now reassign this $$(5/2^{-})$$ state to the isomeric state discovered in this study.

論文

Towards saturation of the electron-capture delayed fission probability; The New isotopes $$^{240}$$Es and $$^{236}$$Bk

Konki, J.*; Khuyagbaatar, J.*; Uusitalo, J.*; Greenlees, P. T.*; Auranen, K.*; Badran, H.*; Block, M.*; Briselet, R.*; Cox, D. M.*; Dasgupta, M.*; et al.

Physics Letters B, 764, p.265 - 270, 2017/01

 被引用回数:12 パーセンタイル:79.17(Astronomy & Astrophysics)

The new neutron-deficient nuclei $$^{240}$$Es and $$^{236}$$Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from $$^{240}$$Es produced in the fusion-evaporation reaction $$^{209}$$Bi($$^{34}$$S,3n)$$^{240}$$Es. Half-lives of 6(2)s and 22$$^{+13}_{-6}$$s were obtained for $$^{240}$$Es and $$^{236}$$Bk, respectively. Two groups of $$alpha$$ particles with energies $$E_{alpha}$$=8.19(3) MeV and 8.09(3) MeV were unambiguously assigned to $$^{240}$$Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for $$^{240}$$Es and $$^{236}$$Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.

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