88Sr

Structure of the Sr-Zr isotopes near and at the magic N=50 shell from g-factor and lifetime measurements in⁸⁸₄₀Zr and ^84,86,88₃₈Sr

G. Kumbartzki et al.

doi: 10.1103/PhysRevC.85.044322

Background: The evolution of and interplay between single-particle and collective excitations in the 40 ⩽N⩽ 50 range for 38Sr and 40Zr isotopes have been studied.

Purpose: Measurement of the g factor of the 2₁⁺ and 4₁⁺ states in radioactive ⁸⁸Zr while simultaneously remeasuring the g(2₁⁺) factors in the Sr isotopes and extention of the measurements to higher energy states in the Sr isotopes. Lifetimes of states in these nuclei are determined.

Methods: The transient field technique in inverse kinematics and line-shape analysis using the Doppler-shift attenuation method are applied. The ⁸⁸Zr nuclei were produced by the transfer of an α particle from the ¹²C nuclei of the target to ⁸⁴Sr nuclei in the beam. The excited states in the stable ⁸⁴Sr isotopes were simultaneously populated via Coulomb excitation by ¹²C in the same target. Coulomb excitation measurements on ^86,88Sr were carried out with the same apparatus.

Results: The resulting g factors and B(E2) values of these nuclei reveal similarities between the two chains of Zr and Sr isotopes. Large-scale shell-model calculations were performed within the p_3/2, f_5/2, p_1/2, g_9/2 orbital space for both protons and neutrons and yielded results in agreement with the experimental data.

Conclusions: In this paper the magnetic moments and lifetimes of several low-lying states in ⁸⁸Zr and ^84,86,88Sr have been measured and compared to large-scale shell-model calculations.