Lifetimes of excited states in neutron rich $^{22}$F

ORAL

Abstract

$^{22}$F was populated from the $^{9}$Be($^{14}$C,p) reaction at $E_{\rm lab}$ = 22 MeV at the the Florida State University Superconducting Accelerator Laboratory. An 1848 $\mu$g/cm$^2$ thick $^{9}$Be target stopped both the recoiling $^{22}$F nuclei and the $^{14}$C beam without slowing the protons from the reaction very much. These protons were detected and identified with a segmented $\Delta E$-$E$ Si particle telescope. $\gamma$ rays were measured using Compton-suppressed high-purity germanium detectors at angles of 35$^\circ$,90$^\circ$, and 145$^\circ$ relative to the beam. Proton-$\gamma$ and proton-$\gamma$-$\gamma$ coincidences were used to analyze the data. Eight previously known $\gamma$-ray transitions were confirmed and three new $\gamma$-ray transitions were found. Lifetimes of 7 excited states in $^{22}$F were measured using the Doppler-shift Attenuation Method (DSAM). This work was supported in part by the National Science Foundation.

Authors

  • Sangjin Lee

    Florida State University

  • S.L. Tabor

    Florida State University

  • A. Aguilar

    Florida State University

  • P.C. Bender

    Florida State University

  • T.A. Hinners

    Florida State University

  • C.R. Hoffmann

    Florida State University

  • M. Perry

    Florida State University

  • Vandana Tripathi

    Dept. of Physics, FSU, Tallahassee, Florida State University