A perturbed angular correlation spectrometer for material science studies |
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Authors: | C C Dey |
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Institution: | (1) Nuclear and Atomic Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata, 700 064, India |
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Abstract: | A four-detector perturbed angular correlation (PAC) spectrometer has been developed with ultra-fast BaF2 detectors to acquire four coincidence spectra simultaneously, two at 180° and two at 90°. This spectrometer has double efficiency
compared to that of a three-detector set-up. Higher efficiency is desirable for PAC studies in solid state physics where large
number of coincidences are required to obtain the PAC spectra with good statistics and is particularly useful when the half-lives
of the parent probe nuclei used for PAC measurements are ∼2–3 days or less as in 111In (2.8 d), 99Mo (2.7 d) and 140La (1.7 d). The performance of the spectrometer has been tested for the HfO2 monoclinic crystal in the temperature range from 77 to 873 K and for the HfF4·3H2O crystal at room temperature. The polycrystalline HfO2 has been synthesized from Hf metal by heating in air. The hydrated hafnium fluoride has been crystallized by dissolving Hf
metal in 40% HF and drying slowly at room temperature.
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Keywords: | Time differential perturbed angular correlation BaF2-BaF2 HfO2 HfF4·3H2O |
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