Recoil distance method lifetime measurement of the 2(1)(+) state in Sr-94 and implications for the structure of neutron-rich Sr isotopes

TitleRecoil distance method lifetime measurement of the 2(1)(+) state in Sr-94 and implications for the structure of neutron-rich Sr isotopes
Publication TypeJournal Article
Year of Publication2017
AuthorsChester, A., G. C. Ball, R. Caballero-Folch, D. S. Cross, S. Cruz, T. Domingo, T. E. Drake, A. B. Garnsworthy, G. Hackman, S. Hallam, J. Henderson, R. Henderson, W. Korten, R. Krucken, M. Moukaddam, B. Olaizola, P. Ruotsalainen, J. Smallcombe, K. Starosta, C. E. Svensson, J. Williams, and K. Wimmer
JournalPhysical Review C
Volume96
Issue1
Pagination6
Date PublishedJul
Type of ArticleArticle
ISBN Number2469-9985
Accession NumberWOS:000405203500001
KeywordsDeformation, ions, nuclear-structure, Physics, tigress, tool, TRIUMF
AbstractA high precision lifetime measurement of the 2(1)(+) state in 94Sr was performed at TRIUMF's ISAC- II facility by coupling the recoil distance method implemented via the TIGRESS integrated plunger with unsafe Coulomb excitation in inverse kinematics. Due to limited statistics imposed by the use of a radioactive 94Sr beam, a likelihood ratio chi(2) method was derived and used to compare experimental data to Geant4 simulations. The B(E2; 2(1)(+)-> 0(1)(+)) value extracted from the lifetime measurement of 7.80(- 0.40)(+0.50)(stat.)+/- 0.07(sys.) ps is approximately 25% larger than previously reported while the relative error has been reduced by a factor of approximately 8. A baseline deformation has been established for Sr isotopes with N <= 58 which is a necessary condition for the quantum phase transition interpretation of the onset of deformation in this region. A comparison to existing theoretical models is presented.
URL<Go to ISI>://WOS:000405203500001
DOI10.1103/PhysRevC.96.011302
Short TitleRecoil distance method lifetime measurement of the 2(1)(+) state in Sr-94 and implications for the structure of neutron-rich Sr isotopes
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