B(E2;21+01+) value in Kr90

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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Article dans une revue
Physical Review C, American Physical Society, 2014, 90, pp.067301. 〈10.1103/PhysRevC.90.067301〉
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http://hal.in2p3.fr/in2p3-01089574
Contributeur : Emmanuelle Vernay <>
Soumis le : mardi 2 décembre 2014 - 08:33:52
Dernière modification le : mardi 22 mai 2018 - 21:48:09

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J.-M. Régis, J. Jolie, N. Saed-Samii, N. Warr, M. Pfeiffer, et al.. B(E2;21+01+) value in Kr90. Physical Review C, American Physical Society, 2014, 90, pp.067301. 〈10.1103/PhysRevC.90.067301〉. 〈in2p3-01089574〉

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