The activity ⁹⁰Y^m was produced by radiative neutron capture on targets of mono-isotopic ⁸⁹Y at several different reactor sites. By observing the γ rays emitted in the decay of ⁹⁰Y^m, the thermal neutron cross section was deduced to be 1.02(1) mb, and the resonance integral was deduced to be 7.82(19) mb or 7.35(15) mb at 2 different reactor sites. The energies of the 3 γ rays emitted in the ⁹⁰Y^m decay were measured to be 202.539(10), 479.532(10), and 682.03(4) keV by comparison with the energies of lines in well-known calibration sources. The half-life of the ⁹⁰Y^m decay was determined to be 3.178(12) h. The cross sections are discussed in the context of a statistical model of radiative capture.

⁹⁰ Y ^m的活性是通过在几个不同的反应堆位置对单个同位素⁸⁹ Y的靶进行辐射中子捕获而产生的。通过观察在⁹⁰ Y ^m的衰减中发射的γ射线，推导出热中子截面为1.02（1）mb，推论共振积分为2时为7.82（19）mb或7.35（15）mb。不同的反应堆地点。与众所周知的校准源中的线能量相比，在⁹⁰ Y ^m衰减中发射的3条γ射线的能量经测量为202.539（10），479.532（10）和682.03（4）keV。⁹⁰ Y ^m的半衰期衰减确定为3.178（12）h。在辐射捕获的统计模型的背景下讨论横截面。