B(E2; 2_(1)^(+) → 0_(1)^(+)) value in Kr^(90)
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2014
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Amer Physical Soc
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Abstract
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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© 2014 American Physical Society. Artículo firmado por 49 autores. This work was supported by NuPNET and the German BMBF by contracts no. 05P12PKNUF and 05P12DRNUP, the Spanish MINECO via projects no. FPA2010-17142, CPAN (CSD 2007-00042), and PRI-PIMNUP-2011-1338 within the ERA-NET NuPNET call for translational joint activities, the UK STFC by contract no. DNC7RP01/4 and the UK National Measurement Office. The EXILL and FATIMA campaign would not have been possible without the support of several services at the ILL and the LPSC. We are grateful to the EXOGAM collaboration for the loan of the detectors, to GANIL for assistance during installation and dismantling, and to the FATIMA collaboration for the provision of LaBr3(Ce) detectors and analog electronics.