The Experts below are selected from a list of 123 Experts worldwide ranked by ideXlab platform
Wayne D. Hutchison - One of the best experts on this subject based on the ideXlab platform.
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Applications of low temperature Nuclear orientation
Hyperfine Interactions, 2012Co-Authors: Wayne D. HutchisonAbstract:The techniques of low temperature Nuclear orientation (LTNO) and Nuclear magnetic resonance on oriented nuclei (NMRON) are versatile tools used across a range of applications. Such applications include Nuclear Moment and hyperfine field measurements and testing of Nuclear decay models, as well as condensed matter studies, particularly applied to magnetism. Following the tradition of such presentations, the techniques LTNO and NMRON, are briefly outlined along with the principal applications with a focus on some recent works.
Gerda Neyens - One of the best experts on this subject based on the ideXlab platform.
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Static Moments of Neutron-Rich Ground States and Isomers Produced by Projectile Fragmentation
Hyperfine Interactions, 2001Co-Authors: Gerda NeyensAbstract:New achievements in Nuclear Moment measurements on nuclei produced and spin-oriented in intermediate energy (50–80 MeV/u) projectile fragmentation reactions are presented. By combining different types of spin-orientation with different experimental techniques, we show that the magnetic dipole Moments and electric quadrupole Moments of exotic neutron rich nuclei in their ground state as well as in their excited isomeric states can be measured. A selection of recent experiments performed at the LISE spectrometer at GANIL (Caen, France) is described.
W.j. Childs - One of the best experts on this subject based on the ideXlab platform.
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M1, E2, and M3 hyperfine structure and Nuclear Moment ratios for 151,153Eu.
Physical review. A Atomic molecular and optical physics, 1991Co-Authors: W.j. ChildsAbstract:The atomic-beam laser-rf double-resonance technique has been used to obtain precise values for the hyperfine structure (hfs) splittings in ten 4{ital f}{sup 7}5{ital d}6{ital s} {sup 10}{ital D}{sub {ital J}} and {sup 8}{ital D}{sub {ital J}} levels of {sup 151,153}Eu I. Detailed studies of the second-order hfs lead to the isotopic ratios of the hfs constants, and reveal surprisingly strong hfs interactions between the two multiplets. The dipole ratios, when compared with the known ratio of the Nuclear dipole Moments, reveal striking {ital J}- and term-dependent hyperfine anomalies. The quadrupole ratios (after corrections for the second-order hfs) are consistent with the atomic ground-state value and self-consistent among the ten levels studied. The precision of the measurements allows evaluation of the ratio of the magnetic octupole hfs interaction constants between the two isotopes. The result, which is taken to be the ratio of the Nuclear ground-state magnetic octupole Moments {Omega}, is found to be {Omega}({sup 151}Eu)/{Omega}({sup 153}Eu)=0.87(6).
Akihiro Yoshimi - One of the best experts on this subject based on the ideXlab platform.
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Nuclear Structure Studies with Polarized Radioactive Beams
AIP Conference Proceedings, 2009Co-Authors: Koichiro Asahi, H. Ueno, D. Kameda, K. Shimada, Takashi Nagatomo, Akihiro Yoshimi, D. Nagae, Makoto Uchida, Takeshi Inoue, M. HatakeyamaAbstract:Nuclear Moment studies on nuclei far from the β‐stability line, performed by taking advantage of the projectile fragmentation reaction, are reviewed. A method to produce spin polarization/alignment in the projectile fragments was developed and utilized for the β‐NMR/NQR measurements. Several new findings in Nuclear structure physics were obtained from the Nuclear Moment experiments done with these techniques.
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Recent result from the Nuclear Moment measurements using a spin polarized radioactive beam
Nuclear Physics A, 2004Co-Authors: D. Kameda, K. Shimada, Koichiro Asahi, Akihiro Yoshimi, Hideki Ueno, Yoshio Kobayashi, H. Miyoshi, Hirofumi Watanabe, J. Murata, G. KatoAbstract:Abstract The first measurement of a magnetic Moment of 19 N was performed by combining a β-NMR method with a spin-polarized radioactive Nuclear beam from the fragmentation reaction. As a result, the g value for the 19 N ground state, g = 0.61 ± 0.03 (preliminary), was obtained. The value was compared with those of 15 N and 17 N. Contrary to shell-mode predictions that the g value should increase with increasing number of neutrons in the sd shell, the obtained g for 19 N g.s. is significantly smaller than g ( 17 N g.s. ) previously obtained.
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Nuclear Moment studies with polarized radioactive Nuclear beams
Hyperfine Interactions, 2001Co-Authors: K. Asahi, Akihiro Yoshimi, K. Sakai, Hiroshi Ogawa, Hideki Ueno, Yoshio Kobayashi, H. Miyoshi, K. Yogo, A. Goto, T. SugaAbstract:Beams of spin-polarized radioactive nuclei are produced in the projectile fragmentation reaction induced by intermediate-energy heavy ion beams, and are used for the measurement of magnetic dipole and electric quadrupole Moments of nuclei in the regions far from stability. In this paper, after remarking the mechanism of fragment polarization and the experimental techniques to make use of it, we discuss the recent results obtained for the electromagnetic Moments of light neutron-rich nuclei at RIKEN. Analyses of the observed magnetic Moments in terms of shell models show intriguing results which imply that some of the basic Nuclear properties, such as the order in energy of the single-particle orbits, the pairing energy between the excess neutrons, and the effective gs-factor for a halo nucleon, tend to alter as the degree of neutron excess increases. Also, the measured electric quadrupole Moments reveal remarkable quenching of the E2 effective charge in nuclei with large N/Z ratios.
Koichiro Asahi - One of the best experts on this subject based on the ideXlab platform.
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Polarized Radioactive Beams and Nuclear Moment Measurements for Exotic Nuclei
Nuclear Physics News, 2009Co-Authors: Koichiro AsahiAbstract:Viewing a nucleus as a collection of independent particles has been, since the spin-orbit force was introduced [1], a successful way of understanding major Nuclear properties that are governed by a particular series of numbers—the magic numbers. Such properties result from the bunching of the single-particle orbits, or the existence of Nuclear shells. About half a century after, however, the present-day studies of nuclei far from the β stability line reveal that the Nuclear shells may evolve [2]: As the N/Z ratio increases, the single particle orbits migrate upward or downward in energy depending on their j = l ± 1/2 character. As a result the decisive role played by one orbit (the valence orbit) is taken over by another, and in some cases the Nuclear deformation sets in even in a nucleus whose N or Z number is a (heretofore) magic number. In such a situation, the Nuclear Moments, namely the magnetic dipole Moments μ and electric quadrupole Moments Q, serve as very useful indicators for alterations in nuc...
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Nuclear Structure Studies with Polarized Radioactive Beams
AIP Conference Proceedings, 2009Co-Authors: Koichiro Asahi, H. Ueno, D. Kameda, K. Shimada, Takashi Nagatomo, Akihiro Yoshimi, D. Nagae, Makoto Uchida, Takeshi Inoue, M. HatakeyamaAbstract:Nuclear Moment studies on nuclei far from the β‐stability line, performed by taking advantage of the projectile fragmentation reaction, are reviewed. A method to produce spin polarization/alignment in the projectile fragments was developed and utilized for the β‐NMR/NQR measurements. Several new findings in Nuclear structure physics were obtained from the Nuclear Moment experiments done with these techniques.
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STUDY OF NEUTRON-RICH NUCLEI THROUGH STATIC ELECTROMAGNETIC MomentS
International Journal of Modern Physics E, 2009Co-Authors: Koichiro Asahi, Daisuke Nagae, K. Shimada, Makoto Uchida, Takeshi Inoue, K. Kameda, Kunifumi Suzuki, N. Hatakeyama, S. Kagami, Y. HasamaAbstract:Nuclear Moment studies on nuclei situated far from the β-stability line, performed by taking advantage of the projectile fragmentation reaction, are reviewed. A method to produce spin polarization/alignment in the projectile fragments was developed and utilized for the β-NMR/NQR measurements. Several new findings in Nuclear structure physics were obtained from the Nuclear Moment experiments done with these techniques.
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Recent result from the Nuclear Moment measurements using a spin polarized radioactive beam
Nuclear Physics A, 2004Co-Authors: D. Kameda, K. Shimada, Koichiro Asahi, Akihiro Yoshimi, Hideki Ueno, Yoshio Kobayashi, H. Miyoshi, Hirofumi Watanabe, J. Murata, G. KatoAbstract:Abstract The first measurement of a magnetic Moment of 19 N was performed by combining a β-NMR method with a spin-polarized radioactive Nuclear beam from the fragmentation reaction. As a result, the g value for the 19 N ground state, g = 0.61 ± 0.03 (preliminary), was obtained. The value was compared with those of 15 N and 17 N. Contrary to shell-mode predictions that the g value should increase with increasing number of neutrons in the sd shell, the obtained g for 19 N g.s. is significantly smaller than g ( 17 N g.s. ) previously obtained.
