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21.
D. R. Atanasov N. Winckler D. Balabanski L. Batist F. Bosch D. Boutin C. Brandau C. Dimopoulou H. G. Essel T. Faestermann H. Geissel I. Hachiuma S. Hess T. Izumikawa P. Kienle R. Kn?bel C. Kozhuharov J. Kurcewicz N. Kuzminchuk S. A. Litvinov Yu. A. Litvinov R. S. Mao R. M?rtin M. Mazzocco G. Münzenberg K. Namihira F. Nolden T. Ohtsubo Z. Patyk R. Reuschl M. S. Sanjari C. Scheidenberger D. Shubina U. Spillmann M. Steck Th. St?hlker B. Sun T. Suzuki M. Trassinelli I. I. Tupitsyn H. Weick M. Winkler D. F. A. Winters T. Yamaguchi 《The European Physical Journal A - Hadrons and Nuclei》2012,48(2):1-6
The half-lives of fully ionized and hydrogen-like (H-like) 122I ions have been measured in a heavy-ion storage ring. The $ \beta^{+}_{}$ -decay constants for both charge states and the electron capture (EC) decay constant of H-like ions have been determined. The EC-decay constant in H-like 122I ions $\ensuremath \lambda^{\text{H-like}}_{\rm EC}=7.35(33)\cdot10^{-4}{\,\mbox{s}}^{-1}$ is, within the uncertainty, the same as the one in neutral atoms. This result is in agreement with the estimates of recent theoretical considerations on the EC-decay of few-electron ions that explicitly take into account the conservation of the total angular momentum of the nucleus plus lepton(s) system and its projections. No firm confirmation could be concluded from our results on the predicted effect that allowed Gamow-Teller transitions become forbidden if the initial and final total angular momenta are not equal.-1 相似文献
22.
Suguru Muto Susumu Ohya Takashi Ohtsubo Takuji Izumikawa Katsuhiko Nishimura 《Hyperfine Interactions》2010,197(1-3):117-121
Nuclear magnetic resonance on oriented nuclei (NMR-ON) on 59Fe isotope in Ni was performed. The magnetic hyperfine splitting frequency of was determined to be ν(B 0?=?0)?=?48.32 (2) MHz. Using the known magnetic moment the magnetic hyperfine field was deduced as B HF?=???28.32 (5) T. The effective nuclear spin-lattice relaxation time was also measured. The measured value is compared with experimental values of 3d-impurity in nickel host. 相似文献
23.
K. Nishimura S. Ohya T. Ohtsubo T. Izumikawa M. Sasaki I. Sato M. Suzuki J. Goto M. Tanigaki A. Taniguchi Y. Ohkubo Y. Kawase S. Muto 《Hyperfine Interactions》2004,159(1-4):239-243
Recent studies of hyperfine fields B
HF of Sr and Y in Fe are briefly reviewed. The B
HF value of Y in Ni is given by NMRON of 91mYNi. The nuclear magnetic moment of the ground state of 93Y is extracted from the β-ray detected NMRON of 93YFe. 相似文献
24.
Y. Hirayama M. Mihara Y. X. Watanabe S. C. Jeong N. Imai K. Matsuta H. Miyatake T. Hashimoto H. Ishiyama S. Ichikawa T. Ishii T. Izumikawa I. Katayama H. Kawakami I. Nishinaka K. Nishio H. Makii S. Mitsuoka S. Momota A. Osa Y. Otokawa T. K. Sato Y. Wakabayashi 《The European Physical Journal A - Hadrons and Nuclei》2011,47(11):1-5
A spin-polarized radioactive 123In (I π , g = 1.220(2) , T 1/2 = 5.97(5) s) beam has been successfully generated by the tilted-foil method. This nuclide is the heaviest ever polarized in its ground state by this method. Using the ISOL-based re-acceleration-type facility TRIAC, an 123Ing.s. beam of 305 keV/nucleon went through a stack of 15 carbon foils with a tilt angle of 70° , and an asymmetry of 0.76 ± 0.25% of β-decays was observed by the β-NMR technique. The asymmetry shows that the tilted-foil method combined with a re-acceleration facility is useful for producing spin-polarized beams for applications such as nuclear physics and materials science. 相似文献
25.
ZHENG Yong-Nan ZHOU Dong-Mei K. Matsuta M. Mihara M. Fukuda D. Nishimura J. Komurasaki D. Ishikawa R. Matsumiya T. Nagatomo T. Izumikawa S. Takahashi H. Hirano T. Ohtsubo S. Momota Y. Nojiri A. Kitagawa M. Kanazawa M. Torikoshi S. Sato T. Minamisono J.R. Alonso G.F. Krebs T. J. M. Symons YUAN Da-Qing ZUO Yi FAN Ping T. Suzuki ZHANG Xi-Zhen ZHU Sheng-Yun 《中国物理C(英文版)》2009,33(Z1)
Nuclear structure of proton-rich unstable nucleus 28P has been studied by measuring its g-factor for the first time. The g-factor of 28P (Iπ =3+, T1/2=270.3 ms) was measured by means of β-NMR technique combined with the new polarization technique for charge exchange reaction product in the intermediate energy heavy ion collisions. The obtained g-factor of g=0.1028(27) is very much quenched from the Schmidt value,but is well reproduced by the shell model (+0.102). In connection with the magnetic moment of the mirror partner and the β-ray transition probability, the orbital angular momenta and intrinsic spins of protons and neutrons have been determined as 〈lp〉 = 0.43(29), 〈ln〉 = 1.85(29), 〈Sp〉 = 0.28(4), and 〈Sn〉 = 0.44(4). 相似文献
26.
D. Nishimura J. Komurasaki K. Matsuta M. Mihara R. Matsumiya S. Momota T. Ohtsubo T. Izumikawa H. Hirano A. Kitagawa M. Kanazawa M. Torikoshi S. Sato M. Fukuda D. Ishikawa T. Minamisono R. Watanabe T. Kubo Y. Nojiri J. R. Alonso G. F. Krebs T. J. M. Symons 《Hyperfine Interactions》2007,180(1-3):71-74
The magnetic moment of short lived β-emitter 24mAl (426 keV, I π ?=?1?+?, T 1/2?=?131 ms) has been measured by means of β-NMR technique, for the first time. From the β-NMR spectrum, the magnetic moment was determined as $\left| {\upmu}\left( ^{\rm 24m}{\rm Al} \right) \right|=\left( {2.99\pm 0.09} \right){\upmu}_{\rm N}$ . Combined with the known magnetic moment of the mirror partner 24mNa, the expectation value of <?S z?> is obtained to be (0.08 ± 0.12). These values are reproduced well by the shell model calculation. 相似文献
27.
T. Ohtsubo Y. Kawamura S. Ohya T. Izumikawa K. Nishimura S. Muto T. Shinozuka 《Hyperfine Interactions》2007,180(1-3):79-83
Nuclear magnetic resonances were measured for 48Sc and 44mSc oriented at 8 mK in an Fe host metal. The magnetic hyperfine splitting frequencies at an external magnetic field of 0.2 T were determined to be 63.22(11) MHz and 64.81(1) MHz for 48Sc and 44mSc, respectively. With the known magnetic moment of $\mu \left( {^{44{\rm m}}\mbox{Sc}} \right)=+3.88\left( 1 \right) \mu _N $ , the magnetic moment of 48Sc is deduced as $\left| {\mu \left( {^{48}\mbox{Sc}} \right)} \right|=3.785\left( {12} \right)\mu _N $ . The measured magnetic moment of 48Sc is discussed in terms of the shell model using the effective interactions. 相似文献
28.
T. Ohtsubo H. Hirano S. Takahashi K. Matsuta M. Mihara M. Fukuda T. Nagatomo T. Izumikawa S. Momota D. Nishimura J. Komurasaki D. Ishikawa D. M. Zhou Y. N. Zheng S. Y. Zhu A. Kitagawa M. Kanazawa M. Torikoshi S. Sato T. Minamisono Y. Nojiri R. Matsumiya T. Sumikama K. Tanaka K. Yamada A. Ozawa T. Suzuki T. Yamaguchi S. Nakajima K. Yoshida Y. Nakashima H. Fujiwara S. Kumashiro M. Ota D. Shinojima H. Tanaka T. Yasuno K. Muranaka T. Maemura A. Chiba S. A. Pahlovy M. Nagao R. Watanabe T. Kubo I. Tanihata M. Takechi K. Minamisono J. R. Alonso G. F. Krebs T. J. M. Symons 《Hyperfine Interactions》2007,180(1-3):85-89
We measured the polarization of the $\upbeta $ -emitting 23Ne (I π ?= 5/2?+?, T 1/2?= 37.24 s) and 25Al(I π ?= 5/2?+?, T 1/2?= 7.18 s) produced through the one nucleon pickup reactions and 24mAl(I π ?= 1?+?, T 1/2?= 131 ms, E ex?= 426 keV) and 28P(I π ?= 3?+?, T 1/2?= 270 ms) produced through charge-exchange reactions in the intermediate energy heavy ion collisions. We compared them with those from the projectile fragmentation process. The larger polarization seems to persistently be positive throughout the momentum distribution, and sharper momentum distributions suggest that nuclear friction mechanism is responsible for the polarization phenomena. 相似文献
29.
Umeda Y Furihata K Sakuda S Nagasawa H Ishigami K Watanabe H Izumikawa M Takagi M Doi T Nakao Y Shin-ya K 《Organic letters》2007,9(21):4239-4242
In the course of our screening program for regulators of a molecular chaperone GRP78 expression, we isolated a novel inhibitor of GRP78 expression, designated as prunustatin A, from Streptomyces violaceoniger 4521-SVS3. The planar structure of prunustatin A was determined to be an oxidized type of the neoantimycin family. Its absolute stereochemistry was established to be 2R, 4S, 6S, 7R, 9S, and 29S by analyzing chemically degraded components obtained from the derivative of prunustatin A. 相似文献
30.
S. Momota M. Mihara D. Nishimura M. Fukuda Y. Kamisho M. Wakabayashi K. Matsuta S. Suzuki M. Nagashima Shengyun Zhu Daqing Yuan Yongnan Zheng Zuo Yi Ping Fan T. Izumikawa A. Kitagawa S. Sato M. Kanazawa M. Torikoshi T. Minamisono Y. Nakamura K. Tashiro A. Honma N. Yoshida H. Shirai T. Ohtsubo T. Nagatomo H. Uenishi K. Iwamoto M. Yaguchi T. Ogura T. Ito K. Yamamura Y. Ichikawa Y. Nojiri J. R. Alonso T. J. M. Symons 《Hyperfine Interactions》2013,218(1-3):53-58
Hyperfine interactions were studied in the intermetallic compound GdRh2Si2 by perturbed angular correlation (PAC) technique using 181Hf(181Ta) probe nuclei. The measurements were performed in the temperature range 15–285 K. The PAC spectra above the antiferromagnetic ordering temperature of the GdRh2Si2 compound (T N ~ 106 K), were analyzed using a model that included only electric quadrupole interactions. The observed major fraction was assigned to the 181Hf(181Ta) probe substituting the Gd atoms. The PAC spectra below Néel temperature were analyzed using combined electric quadrupole and magnetic dipole interactions. The Bhf value at Gd, measured at 15 K was found to be 1.4(1) T which, is smaller, when compared with the values obtained in this compound using other nuclear probes, 155Gd (Bhf ~ 30 T) and 140Ce (Bhf ~ 26 T). The present result using 181Hf(181Ta) probe is quite interesting since it shows that the contribution to Bhf at Gd due the host is smaller than other components which contribute to the hyperfine field. The temperature dependence of Bhf shows an anomalous behavior. 相似文献