Beta-NMR of short-lived nucleus 17 N in liquids
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Beta-NMR of short-lived nucleus 17N in liquids Mototsugu Mihara 1 & Takanobu Sugihara 1 & Mitsunori Fukuda 1 & Akira Homma 2 & Takuji Izumikawa 3 & Atsushi Kitagawa 4 & Kensaku Matsuta 1 & Tadanori Minaisono 1 & Sadao Momota 5 & Takashi Nagatomo 6 & Hiroki Nishibata 6 & Daiki Nishimura 7 & Kosuke Ohnishi 1 & Takashi Ohtsubo 2 & Akira Ozawa 8 & Shinji Sato 4 & Masaomi Tanaka 1 & Ryo Wakabayashi 1 & Shoichi Yagi 1 & Rikuto Yanagihara 1
# Springer Nature Switzerland AG 2019
Abstracts The β-ray detected nuclear magnetic resonance (β-NMR) of a short lived-nucleus 17N (I = 1/2, T1/2 = 4.173 s) in liquid H2O and CH3NO2 has been performed. A π-pulse method was applied to obtain sharp NMR lines, from which the ratio of the Larmor frequencies of 17N in CH3NO2 and 1H was determined to be ν[17N in CH3NO2]/ν[1H2O] = 0.1265751 ± 0.0000019. Two resonance lines were observed for 17N in H2O with the relative frequency shifts of –(2.33 ± 0.37) × 10−4 and (2.91 ± 0.27) × 10−4 referenced to 17N in CH3NO2. Keywords β-NMR in liquids . Nitrogen . Implantation . Chemical shift . H2O . CH3NO2
1 Introduction The technique of β-ray detected nuclear magnetic resonance (β-NMR) has been applied to the study of nuclear electromagnetic moments of unstable nuclei [1, 2] and materials science through hyperfine interactions [3] for many years. However, most of β-NMR measurements have been made in solid materials even though the liquid NMR technique for stable nuclei has been long ago established and applied to many fields. Recently, some groups have reported new results on the βNMR spectroscopy in liquids [4–6], since a new attempt has been performed to guide a radioisotope (RI) beam into a liquid material at ISOLDE-CERN [7]. This leads us to believe that the β-NMR in liquids has a new possibility to approach the nuclear moment study and application to the chemistry and biochemistry. In the present study, we have performed the β-NMR measurements in liquids using a short-lived nitrogen isotope 17N (Iπ = 1/2−, T1/2 = 4.2 s). Though This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2019), Goa, India, 10-15 February 2019 Edited by S. N. Mishra, P. L. Paulose and R. Palit
* Mototsugu Mihara [email protected] Extended author information available on the last page of the article
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we have already observed β-NMR of another isotope 12N (Iπ = 1+, T1/2 = 11 ms) in liquid H2O [6], the 17N nucleus with spin I = 1/2 might be more suitable than 12N for precise chemical shift measurements. Because 17N has no electric quadrupole moment (Q) due to I = 1/2, it does not make any contribution of the quadrupole interaction to the NMR line. Therefore, the line width should be narrower than that for 12N which has finite Q = (9.8 ± 0.9) mb [8]. This is similar to the situation for the conventional NMR of stable nitrogen isotopes 15N (I = 1/2) and 14N (I = 1) with Q = (20.01 ± 0.10) mb [8, 9]. Using a s
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