The lifetime of the bound excited level in Ni$^-$

Authors :: Kamińska, M.
Davis, V. T.
Hole, O. M.
Nascimento, R. F.
Chartakunchand, K. C.
Blom, M.
Björkhage, M.
Källberg, A.
Löfgren, P.
Reinhed, P.
Rosén, S.
Simonsson, A.
Thomas, R. D.
Mannervik, S.
Neill, P. A.
Thompson, J. S.
Schmidt, H. T.
Cederquist, H.
Hanstorp, D.
Publication Year :: 2015
Publisher :: arXiv, 2015.
Abstract: The intrinsic lifetime of the upper level in the bound-bound 3d$^9$4s$^2$ $^2$D$_{3/2}$ $\rightarrow$ 3d$^9$4s$^2$ $^2$D$_{5/2}$ radiative transition in Ni$^-$ was measured to be 15.1 $\pm$ 0.4 s. The experiment was performed at cryogenic temperatures in one of the ion-beam storage rings of the DESIREE (Double ElectroStatic Ion Ring Experiment) facility at Stockholm University. The storage lifetime of the Ni$^-$ ion-beam was measured to be close to five minutes at a ring temperature of 13 K.<br />Comment: 12 pages, 5 figures