Production of spin polarized 12 N through heavy ion reactions
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Production of spin polarized 12 N through heavy ion reactions M. Mihara · K. Matsuta · D. Nishimura · M. Fukuda · M. Yaguchi · K. Iwamoto · M. Wakabayashi · Y. Kamisho · J. Ohno · Y. Morita · T. Izumikawa · T. Ohtsubo · S. Suzuki · M. Nagashima · K. Abe · T. Sakai · S. Momota · A. Ozawa · D. Nagae · Y. Ishibashi · Y. Abe · T. Niwa · T. Nagatomo · T. Minamisono · M. K. Kubo · A. Kitagawa · M. Torikoshi · M. Kanazawa · S. Sato Published online: 17 April 2013 © Springer Science+Business Media Dordrecht 2013
Abstract Production of spin polarized short-lived nucleus 12 N (I π = 1+ , T1/2 = 11 ms) using heavy ion reactions at intermediate energies has been performed. Typical polarization of about −25 % and +10 % through the projectile fragmentation Be(14 N, 12 N)X and the charge exchange CH2 (12 C, 12 N)X processes, respectively, was obtained. The present study proved that the combination of a 12 C beam and a proton target provides a fairly good quality of polarized 12 N beam in terms of intensity and energy uniformity, and is promising for materials science use of 12 N as a nuclear probe. Keywords Polarized unstable nuclei · β-NMR · Heavy ion reactions
Proceedings of the 4th Joint International Conference on Hyperfine Interactions and International Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2012), Beijing, China, 10–14 September 2012. M. Mihara (B) · K. Matsuta · M. Fukuda · M. Yaguchi · K. Iwamoto · M. Wakabayashi · Y. Kamisho · J. Ohno · Y. Morita · T. Minamisono Department of Physics, Osaka University, 1-1, Machikaneyama, Toyonaka, Osaka 560-0043, Japan e-mail: [email protected] D. Nishimura Department of Physics, Tokyo University of Science, 2641, Yamazaki, Noda, Chiba 278-8510, Japan T. Izumikawa Radioisotope Center, Niigata University, 1-757, Asahimachi-dori, Niigata 951-8510, Japan T. Ohtsubo · S. Suzuki · M. Nagashima · K. Abe · T. Sakai Department of Physics, Niigata University, 8050, Ikarashi 2-no-cho, Niigata 950-2181, Japan S. Momota Kochi University of Technology, Miyano-kuchi, Tosayamada-cho, Kochi 782-8502, Japan
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1 Introduction Spin polarized radioactive nuclear beams are extremely useful to study hyperfine interactions for materials science as well as for nuclear and fundamental physics. Short-lived β-emitter 12 N (I π = 1+ , T1/2 = 11 ms) is an attractive probe nucleus of the beta-detected nuclear magnetic resonance (β-NMR), which is applied to the study of nitrogen impurity atoms in various materials such as TiO2 and ZnO [1, 2]. For producing spin polarized 12 N nuclei, the low energy nuclear reaction 10 B(3 He, α)12 N has been conventionally used [3], in which the recoiled 12 N has spin polarization of about 20–30 % with a recoil angle of ∼20◦ and a 3 He beam energy of 3 MeV. In addition to this convenient method only by using a compact accelerator, heavy ion reactions at intermediate energies are also promising to produce highly polarized unstable nuclei as in the case of 12 B with polarization of more than 30 % induced through the projectile fragment
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