Isotope harvesting is a method of collecting the long-lived radioisotopes that build up during the operation of ion-beam facilities in a way that is useful for subsequent research. As a demonstration of this method for the collection of a group IV metal at a fragmentation facility, the high-energy ${}^{88}\mathrm{Zr}$ secondary beam produced from a 140-MeV/u ${}^{92}\mathrm{Mo}$ primary beam at the National Superconducting Cyclotron Laboratory (NSCL) was stopped in a water target. The setup aimed to mimic the aqueous beam dump that will be implemented at the Facility for Rare Isotope Beams (FRIB). The collected ${}^{88}\mathrm{Zr}$ and accompanying ${}^{88}\mathrm{Y}$ decay daughter were radiochemically extracted from the solution and made into target samples suitable for neutron-capture cross-section measurements. These samples were then irradiated at two reactor facilities, and the ${}^{88}\mathrm{Zr}$ average thermal-neutron-capture cross section (${\sigma }_T$) and resonance integral ($I$) were determined to be ${\sigma }_T=(8.04\pm 0.63)\times {10}^5$ b and $I=(2.53\pm 0.28)\times {10}^6$ b. The ${\sigma }_T$ value agrees well with previous results and $I$, determined for the first time here, was found to be the largest measured resonance integral by two orders of magnitude. The ${}^{88}\mathrm{Y}$ thermal-neutron-capture cross section was determined to be less than $1.8\times {10}^4$ b. This work demonstrates the steps needed to make cross-section measurements with samples produced via aqueous isotope harvesting.

中文翻译：

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在放射性离子束设备上水收集Zr88进行横截面测量

同位素收集是一种收集长寿命放射性同位素的方法，该同位素在离子束设备运行期间会积累起来，对以后的研究很有用。为了证明这种在碎裂装置中收集第IV组金属的方法，高能${}^{88}锆$ 140 MeV / u产生的次级光束 ${}^{92}莫$国家超导回旋加速器实验室（NSCL）的一次光束被停在了水靶中。该设置旨在模拟水离子束转储，将在稀有同位素束设施（FRIB）上实施。收集到的${}^{88}锆$ 和伴随 ${}^{88}\mathrm{ÿ}$从溶液中化学提取出衰变子，并将其制成适合中子俘获截面测量的目标样品。然后，这些样品在两个反应堆设施中进行辐照，${}^{88}锆$ 平均热中子俘获截面（${\sigma }_{Ť}$）和共振积分（$\mathrm{一世}$）被确定为 ${\sigma }_{Ť}=（8.04\pm 0.63）\times {10}^5$ 乐队 $\mathrm{一世}=（2.53\pm 0.28）\times {10}^6$b。这${\sigma }_{Ť}$ 价值与先前的结果非常吻合，并且 $\mathrm{一世}$在此首次确定的，被测得是最大的测量共振积分两个数量级。这${}^{88}\mathrm{ÿ}$ 热中子俘获截面确定为小于 $1.8\times {10}^4$b。这项工作演示了通过含水同位素收集产生的样品进行横截面测量所需的步骤。