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1.
T. Nagatomo H. Ueno M. Mihara K. Matsuta A. Yoshimi Y. Ichikawa K. Yamada H. Kawamura A. Ozawa T. Moriguchi Y. Ishibashi K. Asahi M. Uchida K. Suzuki T. Inoue Y. Hasama H. Iijima T. Sumikama M. Fukuda T. Minamisono 《Hyperfine Interactions》2010,198(1-3):103-107
Electric quadrupole coupling constant eqQ/h of the extremely proton-rich 23Al (I π ?=?5/2?+?, T 1/2?=?0.47 s) nucleus implanted into an Al2O3 single crystal has been measured for the first time, using the β-ray detecting nuclear quadrupole resonance method (β-NQR) in a high magnetic field. As a preliminary result, the quadrupole coupling constant was determined as |eqQ/h(23Al) |?=?2.66±0.77 MHz. Using the quadrupole coupling constant of 27Al in Al2O3 as a reference, the Q moment of the ground state of 23Al was extracted as |Q(23Al)|?~?160 mb, which is well explained by the shell model calculation in the sd-shell model space with the USD interaction. 相似文献
2.
Matsuta K. Onishi T. Fukuda M. Minamisono T. Mihara M. Sasaki M. Yamaguchi T. Miyake T. Sato K. Minamisono K. Ohsumi F. Muramoto Y. Oui S. Ha C. Tanaka K. Kidera K. Morishita A. Tsubota T. Sumikama T. Kitagawa A. Torikoshi M. Kanazawa M. Nishio T. Koda S. Ohtsubo T. Fukuda S. Nojiri Y. Momota S. Ozawa A. Yoshida K. Suzuki T. Kobayashi T. Tanihata I. Hanna S.S. Alonso J.R. Krebs G.F. Symons T.J.M. 《Hyperfine Interactions》1999,120(1-8):713-717
The degrees of nuclear spin polarization of 8,12B, 9C, 12N, 13O, 20,21F, 23Mg, 27Si and 39Ca produced in the high energy 12,13C, 16O, 22Ne, 24Mg, 28Si and 40Ca ions on Be collisions have been measured systematically, for the technical developments of the nuclear moment studies as
well as the hyperfine interaction studies by means of β-NMR technique. The fragment momentum dependences were well reproduced
by the simple kinematical model. Incident energy dependence and the mass dependence as well as the reaction angle dependences
were qualitatively explained by the mixing of the near and far side collisions.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
3.
T. Sumikama M. Ogura Y. Nakashima T. Iwakoshi M. Mihara M. Fukuda K. Matsuta T. Minamisono H. Akai 《Hyperfine Interactions》2004,158(1-4):413-416
We observed the electric quadrupole interaction of 12B implanted in the interstitial site of TiO2 using β-NMR method. The electric field gradients including the direction of the principal axes were determined. The direction agreed
well with the theoretical calculation. 相似文献
4.
K. Tshoo Y. Satou H. Bhang S. Choi T. Nakamura S. Deguchi Y. Kawada Y. Kondo N. Kobayashi Y. Nakayama K. N. Tanaka N. Tanaka N. Aoi M. Ishihara T. Motobayashi H. Otsu H. Sakurai S. Takeuchi Y. Togano K. Yoneda Z. H. Li F. Delaunay J. Gibelin F. M. Marques N. A. Orr T. Honda M. Matsushita T. Kobayashi Y. Miyashita T. Sumikama K. Yoshinaga S. Shimoura D. Sohler T. Zheng Z.X. Cao 《Few-Body Systems》2013,54(1-4):459-463
The unbound excited states of the most neutron-rich dripline oxygen isotope, 24O, have been investigated by using the 24O(p,p′)24O* reaction at the beam energy of 62 MeV/nucleon in inverse kinematics. The first and second unbound excited states of 24O have been observed at ${E_{\rm x}= 4.63_{-0.14}^{+0.30}}$ MeV and ${E_{\rm x}= 5.13_{-0.24}^{+0.19}}$ MeV (preliminary) along with the evidence for another higher lying state at around 7.3 MeV. The quadrupole deformation parameter ${\beta_{2^+}}$ was deduced to be ${0.15_{-0.03}^{+0.08}}$ (preliminary) for the first time. The systematics of the ${\beta_{2^+}}$ and the ${E_{\rm x}(2_1^+)}$ in the Z = 8 isotopes shows the N = 16 spherical shell closure in 24O. 相似文献
5.
Nagatomo T. Matsuta K. Hashimoto K. Ota M. Arimura K. Minamisono K. Sumikama T. Ogura M. Iwakoshi T. Miyake T. Kudo S. Akutsu K. Minamisono T. Fukuda M. Mihara M. Momota S. Nojiri Y. Kitagawa A. Torikoshi M. Kanazawa M. Suda M. Hirai M. Symons T. J. M. Krebs G. F. Alonso J. R. Zhu S. Y. Zhu J. Z. Xu Y. J. 《Hyperfine Interactions》2001,136(3-8):233-237
The nuclear spin alignments of the β-emitting fragments 12B(I
π=1+, T
1/2=20.2 ms) and 13B(I
π=3/2−, T
1/2=17.4 ms) produced in the 100A-MeV 13C, 15N + 9Be collisions respectively have been observed for the first time detecting asymmetric β-ray emission from these nuclei. By
means of the spin manipulation technique based on the hyperfine interaction of B isotopes in TiO2, both the polarization P and the alignment A were determined reliably. The obtained P and A were significantly smaller than the expectation from the kinematical model. From the fact that the quenching factors for
P and A are almost the same, there may be some depolarization mechanism in the collision process itself.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
6.
K. Matsuta M. Mihara T. Nagatomo R. Matsumiya S. Momota T. Ohtsubo T. Izumikawa H. Hirano S. Takahashi D. Nishimura J. Komurasaki A. Kitagawa M. Kanazawa M. Torikoshi S. Sato M. Fukuda T. Minamisono T. Sumikama K. Tanaka M. Takechi D. Ishikawa S. A. Pahlovy M. Nagao Y. Nojiri J. R. Alonso G. F. Krebs T. J. M. Symons 《Hyperfine Interactions》2007,174(1-3):65-69
A brief review is presented of recent work with the Precision Penning Trap Mass Spectrometer, formerly at MIT, now at Florida
State University. This includes atomic mass comparisons using single trapped ions; mass comparisons using two simultaneously
trapped ions alternated between large and small cyclotron radii; and measurement of the dipole moment of a molecular ion using
the polarizability-induced shift in cyclotron frequency. 相似文献
7.
The mechanism of the ion permeation is investigated for an anion-doped carbon nanotube, as a model of the K+ channel, by analyzing the free energy surface and the dynamics of the ion permeation through the model channel. It is found that the main rate-determining step is how an ion enters the channel. The entrance of the ion is mostly blocked by a water molecule located at this entrance. Only about 10% of K+ ions which reach the mouth of the channel can really enter the channel. The rejection rate sensitively depends on the location of this water molecule, which is easily controlled by the charge of the carbon nanotube; for example, the maximum permeation is obtained when the anion charge is at a certain value, -5.4e in the present model. At this charge, the facile translocation of the ion inside the channel is also induced due to the number of fluctuations of the ions inside the channel. Therefore, the so-called "Newton's balls", a toy model, combined with a simple ion diffusion model for explaining the fast ion permeation should be modified. The present analysis thus suggests that there exists an optimum combination of the length and the charge of the carbon nanotube for the most efficient ion permeation. 相似文献
8.
M. Mihara K. Matsuta D. Nishimura T. Nagatomo R. Matsumiya S. Momota T. Ohtsubo T. Izumikawa D. M. Zhou Y. N. Zheng M. Ogura H. Akai J. Komurasaki M. Fukuda D. Ishikawa Y. Nojiri H. Hirano S. Takahashi R. Watanabe T. Kubo S. Y. Zhu A. Kitagawa M. Kanazawa S. Sato M. Torikoshi T. Sumikama T. Minamisono J. R. Alonso G. F. Krebs T. J. M. Symons 《Hyperfine Interactions》2007,178(1-3):83-86
The spin-lattice relaxation times T 1 for short-lived β emitters 25Al(I?=?5/2, T 1/2?= 7.2 s) and 28P(I?=?3, T 1/2?= 270 ms) in Pt were measured by means of the β-NMR technique. As a result, T 1[25Al in Pt] = (1.1 $^{+\ 0.7}_{-\ 0.3})$ s and T 1[28P in Pt] >0.5 s were obtained at temperatures of 17 and 20 K, respectively. The Knight shifts were estimated from the Korringa relation, which were evaluated by comparing to the first principle calculations. 相似文献
9.
N. Kobayashi T. Nakamura Y. Kondo N. Aoi H. Baba S. Deguchi N. Fukuda G. S. Lee H. S. Lee N. Inabe M. Ishihara Y. Kawada R. Kanungo T. Kubo M. A. Famiano M. Matsushita T. Motobayashi T. Ohnishi N. A. Orr H. Otsu R. Barthelemy H. Sakurai S. Kim T. Sako T. Sumikama Y. Satou K. Takahashi H. Takeda M. Takechi S. Takeuchi K. N. Tanaka N. Tanaka R. Tanaka Y. Togano K. Yoneda 《Few-Body Systems》2013,54(7-10):1441-1444
The one-neutron removal cross section from 29Ne, 33,35,37Mg, and 39,41Si on a Pb target have been measured at around 240 MeV/nucleon at the RIBF (RI-Beam Factory) at RIKEN. This main goal of the experiment was to extract the inclusive Coulomb breakup cross sections in order to probe possible halo structures through their enhanced low-energy E1 strengths - so-called soft E1 excitations. The results showed significant enhancement of the one-neutron removal Coulomb breakup cross section for 37Mg. This in turn provides evidence for the existence of halo structure in 37Mg. 相似文献
10.
T. Sumikama T. Iwakoshi T. Nagatomo M. Ogura Y. Nakashima H. Fujiwara K. Matsuta T. Minamisono M. Mihara M. Fukuda K. Minamisono T. Yamaguchi 《Hyperfine Interactions》2004,159(1-4):281-284
The pure nuclear spin alignments of 8Li and 8B were produced from the nuclear spin polarization applying the β-NMR method. The alignment correlation terms in the β-ray angular distribution were observed to test the G parity conservation in the nuclear β decay. 相似文献