Abstract
A high precision lifetime measurement of the state in 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 beam, a likelihood ratio method was derived and used to compare experimental data to Geant4 simulations. The value extracted from the lifetime measurement of 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 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.
- Received 19 December 2016
- Revised 13 February 2017
DOI:https://doi.org/10.1103/PhysRevC.96.011302
©2017 American Physical Society