Abstract
Background: The structure of the semimagic isotopes were previously studied via measurements of ) and factors of states. The values of the ) in the isotopes below midshell at = 66 show an enhancement in collectivity, contrary to predictions from shell-model calculations.
Purpose: This work presents the first measurement of the and states' magnetic moments in the unstable neutron-deficient . The factors provide complementary structure information to the interpretation of the observed values.
Methods: The nuclei have been produced in inverse kinematics in an -particle transfer reaction from to projectiles at 390, 400, and 410 MeV. The factors have been measured with the transient field technique. Lifetimes have been determined from line shapes using the Doppler-shift attenuation method.
Results: The factors of the and states in are = +0.29(11) and = +0.05(14), respectively. In addition, the = +0.27(6) in has been measured for the first time. A line-shape analysis yielded = 0.81(10) ps and a lifetime of = 0.25(5) ps was calculated from the fully Doppler-shifted line.
Conclusions: No evidence has been found in that would require excitation of protons from the closed core.
- Received 21 December 2015
- Revised 8 March 2016
DOI:https://doi.org/10.1103/PhysRevC.93.044316
©2016 American Physical Society