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$B(E2; 2_1^+ \to 0_1^+)$ value in $^{90}Kr$

Abstract : A smooth onset of collectivity in Kr-88,Kr-92,Kr-94,Kr-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 U-235. The lifetime of the 2(1)(+) state in Kr-90 was measured via the electronic gamma-gamma timing technique using the EXILL and FATIMA spectrometers. Based on themeasured mean lifetime of tau = 15(10) ps, the B(E2; 2(1)(+) -> 0(1)(+)) value of 13(-5)(+26) 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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http://hal.in2p3.fr/in2p3-01089574
Contributor : Emmanuelle Vernay <>
Submitted on : Tuesday, December 2, 2014 - 8:33:52 AM
Last modification on : Friday, November 20, 2020 - 9:46:03 AM

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J.-M. Régis, J. Jolie, N. Saed-Samii, N. Warr, M. Pfeiffer, et al.. $B(E2; 2_1^+ \to 0_1^+)$ value in $^{90}Kr$. Physical Review C, American Physical Society, 2014, 90, pp.067301. ⟨10.1103/PhysRevC.90.067301⟩. ⟨in2p3-01089574⟩

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