%0 Journal Article
%A Fraile Prieto, Luis Mario
%A Mach, H.
%A Paziy, V.
%A Olaizola, B.
%A Vedia, V.
%T B(E2; 2_(1)^(+) → 0_(1)^(+)) value in Kr^(90)
%D 2014
%@ 0556-2813
%U https://hdl.handle.net/20.500.14352/33924
%X A smooth onset of collectivity in Kr^(88,92,94,96) has been determined from reported B(E2; 2_(1)^(+) → 0_(1)^(+)) and E(2+ 1 ) values. This is in contrast to the sudden onset in even-even Zr, Mo, and Sr isotopes. Our objective was to complete the systematics by determining the B(E2; 2+ 1 → 0+ 1 ) value in Kr^(90), which was produced by cold-neutron-induced fission of 235U. The lifetime of the 2+ 1 state in Kr^(90) was measured via the electronic γ -γ timing technique using the EXILL and FATIMA spectrometers. Based on the measured mean lifetime of τ = 15(10) ps, the B(E2; 2_(1)^(+) → 0_(1)^(+)) value of 13^(+26)_(−5) W.u. in Kr^(90) is determined for the first time and the smooth onset of deformation in the even-even Kr isotopes beyond neutron number N = 50 is confirmed.
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