Interpretation of Anomalous Larmor Frequencies in Ferromagnetic Resonance Experiment
Interpretation of Anomalous Larmor Frequencies in Ferromagnetic Resonance Experiment
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DOI：
10.1103/physrev.71.270.2
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发表时间：
1947-02
期刊：
影响因子：
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通讯作者：
C. Kittel
中科院分区：
文献类型：
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作者：
C. Kittel
马克 6.英格拉姆、理查德·J·海登和大卫·C·贝斯，JR。阿贡国家实验室，芝加哥大学，芝加哥，伊利诺伊州 1947 年 1 月 17 日 Lu2O3、Yb2O3 和 Dy2O3 的 gITRIC 酸溶液在阿贡重水堆中用中子辐照。根据 Flammersfeld 和 Mattauch 的报道，经辐照的镥样品的衰变曲线显示出 3. 4 小时和 6. 6 天的活性。镱-bium 样品的衰变曲线显示出 2. 7 小时的活性（可能与 Marsh 和 Sugden 报道的 3. 5 小时的活性相同）以及之前未报道的 102 小时的活性。没有发现普尔和奎尔报告的 41 小时活动的证据。镝样品的衰变曲线显示了 Marsh 和 Sugden 报告的 2. 5 小时活性。对这些活性同位素中的三种的质量分配如下。将含有所讨论活性的样品的一部分放置在质谱仪的灯丝源上。光谱仪的操作分离了同位素并将它们沉积在照相底片上。通过将第二个照相底片与原件面对面放置来确定活性同位素在该底片上的位置。第一个板上活性同位素的分解在两个板上产生了可显影的图像。将该活性沉积物的位置与原始板上的正常质谱进行比较，确定了活性同位素的质量。这种质量分配方法无需假设形成同位素的核反应即可给出结果，因此对于建立核反应通常很有价值。使用这些技术，分配了以下质量：6. 6 天镥，177； 102小时镱，175； 2. 5 小时镝，165。
MARK 6. INGHRAM, RICHARD J. HAYDEN, AND DAVID C. BESS, JR. Argonne National Laboratory, P'niversity of Chicago, Chicago, Illinois January 17, 1947 g tITRIC acid solutions of Lu203, Yb203, and Dy203 were irradiated with neutrons in the Argonne heavy water pile. Decay curves of the irradiated lutecium sample showed 3. 4-hour and 6. 6-day activities as reported by Flammersfeld and Mattauch.'Decay curves of the ytter-bium sample showed a 2. 7-hour activity (probably the same activity reported by Marsh and Sugden'as 3. 5 hours) and also a 102-hour activity not previously reported. No evidence of the 41-hour activity reported by Pool and Quill'was found. Decay curves of the dysprosium sampleshowed the 2. 5-hour activity reported by Marsh and Sugden.'Assignment of mass to three of these active isotopes was made as follows. A portion of the sample containing the activity in question was placed on the filament sour'ce of a mass spectrograph. Operation of the spectrograph sepa-rated the isotopes and deposited them on a photographic plate. The position of the active isotope on this plate was determined by placing a second photographic plate face to face with the original. The disintegration of the active isotopes on the first plate produced developable images on both plates. Comparison of the position of this active deposit with the normal mass spectrum on the original plate determined the mass of the active isotope. This method of mass assignment gives results without the necessity of assuming the nuclear reaction by which the isotope is formed and is therefore frequently valuable in establishing the nuclear reaction. Using these techniques the following masses were assigned: 6. 6-day lutecium, 177; 102-hour ytterbium, 175; and 2. 5-hour dysprosium, 165.