  An in-flight beam of $^{16}$N was produced via the single-neutron adding
($d$,$p$) reaction in inverse kinematics at the recently upgraded Argonne
Tandem Linear Accelerator System (ATLAS) in-flight system. The amount of the
$^{16}$N beam which resided in its excited 0.120-MeV $J^{\pi}=0^-$ isomeric
state (T$_{1/2}\approx5$ $\mu$s) was determined to be 40(5)% at a reaction
energy of 7.9(3) MeV/$u$, and 24(2)% at a reaction energy of 13.2(2) MeV/$u$.
The isomer measurements took place at an experimental station $\approx30$ m
downstream of the production target and utilized an Al beam-stopping foil and a
HPGe Clover detector. Composite $^{16}$N beam rate determinations were made at
the experimental station and the focal plane of the Argonne in-flight
radioactive ion-beam separator (RAISOR) with Si $\Delta$E-E telescopes. A
Distorted Wave Born Approximation (DWBA) approach was coupled with the known
spectroscopic information on $^{16}$N in order to estimate the relative
$^{16}$N isomer yields and composite $^{16}$N beam rates. In addition to the
observed reaction-energy dependence of the isomer fraction, a large sensitivity
to angular acceptance of the recoils was also observed.
