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排序方式: 共有123条查询结果,搜索用时 15 毫秒
71.
Eronen T Elomaa V Hager U Hakala J Jokinen A Kankainen A Moore I Penttilä H Rahaman S Rissanen J Saastamoinen A Sonoda T Aystö J Hardy JC Kolhinen VS 《Physical review letters》2006,97(23):232501
The beta-decay Q(EC) values of the superallowed beta emitters 26Alm, 42Sc, and 46V have been measured with a Penning trap to a relative precision of better than 8 x 10(-9). Our result for 46V, 7052.72(31) keV, confirms a recent measurement that differed from the previously accepted reaction-based Q(EC) value. However, our results for 26Alm and 42Sc, 4232.83(13) keV and 6426.13(21) keV, are consistent with previous reaction-based values. By eliminating the possibility of a systematic difference between the two techniques, this result demonstrates that no significant shift in the deduced value of Vud should be anticipated. 相似文献
72.
Kankainen A Elomaa VV Batist L Eliseev S Eronen T Hager U Hakala J Jokinen A Moore ID Novikov YN Penttilä H Popov A Rahaman S Rinta-Antila S Rissanen J Saastamoinen A Seliverstov DM Sonoda T Vorobjev G Weber C Aystö J 《Physical review letters》2008,101(14):142503
Nuclides in the vicinity of 94Ag have been studied with the Penning trap mass spectrometer JYFLTRAP at the Ion-Guide Isotope Separator On-Line. The masses of the two-proton-decay daughter 92Rh and the beta-decay daughter 94Pd of the high-spin isomer in 94Ag have been measured, and the masses of 93Pd and 94Ag have been deduced. When combined with the data from the one-proton- or two-proton-decay experiments, the results lead to contradictory mass excess values for the high-spin isomer in 94Ag, -46 370(170) or -44 970(100) keV, corresponding to excitation energies of 6960(400) or 8360(370) keV, respectively. 相似文献
73.
Teresa CzuryszkiewiczJarno Ahvenlammi Pirjo KortesuoManja Ahola Freddy KleitzMika Jokinen Mika Lindén J.B. Rosenholm 《Journal of Non》2002,306(1):1-10
Sol-gel derived biodegradable SiO2 gel fibers have been prepared and characterized by Raman spectroscopy, SEM, 29Si MAS NMR and TG-MS, respectively. An active component, dexmedetomidine hydrochloride, was incorporated in situ into the fiber structure, by adding it to the sol used for fiber spinning. The subsequent release of the active component was studied in vitro and shown to be determined by differences in the fiber structure, for which clear but indirect evidence was obtained from the different characterization methods used. 相似文献
74.
P. Campbell A. Nieminen J. Billowes P. Dendooven K.T. Flanagan D.H. Forest Yu.P. Gangrsky J.A.R. Griffith J. Huikari A. Jokinen I.D. Moore R. Moore H.L. Thayer G. Tungate S.G. Zemlyanoi J. Äystö 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):45-48
A new RFQ ion-beam cooler and buncher, installed after the mass-separating magnet of the ion guide isotope separator, IGISOL,
JYFL, has dramatically increased the scope of on-line laser spectroscopy at this facility. The device, operated in a bunching
mode, has permitted new measurements on short-lived radionuclei in the Ti, Zr and Hf chains at a sensitivity two orders of
magnitude greater than that previously achieved. The device has also opened new prospects for laser-based nuclear spectroscopy
at the facility, particularly collinear resonance ionisation spectroscopy.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: pc@mags.ph.man.ac.uk 相似文献
75.
K.?Per?j?rviEmail author J.?Cerny L.?M.?Fraile A.?Jokinen A.?Kankainen U.?K?ster J.??yst? The ISOLDE Collaboration 《The European Physical Journal A - Hadrons and Nuclei》2004,21(1):7-10
The beta-decay of 232Fr to excited states in 232Ra has been studied using gamma-gamma coincidence detection combined with the isotope separator on-line technique at the ISOLDE PSB facility at CERN. Earlier findings are confirmed and three new gamma lines are reported. In addition to the beta-decay characteristics of 232Fr, the K = 0 ground-state band in 232Ra is identified. A yield survey of neutron-rich Fr isotopes, important also for the EURISOL project, is incorporated.Received: 20 April 2004, Revised: 12 May 2004, Published online: 13 July 2004PACS:
21.10.-k Properties of nuclei; nuclear energy levels - 23.20.-g Electromagnetic transitions - 28.60. + s Isotope separation and enrichment - 29.25.Rm Sources of radioactive nuclei 相似文献
76.
J. Huikari M. Oinonen A. Algora J. Cederkäll S. Courtin P. Dessagne L. Fraile S. Franchoo H. Fynbo W.X. Huang A. Jokinen A. Knipper F. Marechal C. Miehé E. Nacher K. Peräjärvi E. Poirier L. Weissman J. Äystö 《The European Physical Journal A - Hadrons and Nuclei》2003,16(3):359-363
The β-decay of 75Sr to its mirror nucleus 75Rb was studied at the ISOLDE PSB facility at CERN by means of β-delayed γ and proton spectroscopy. The decay Q-value and β-delayed γ intensity were measured for the first time. These results, 10.60±0.22 MeV and 4.5+1.9
-0.7%, together with accurate measurements of the β-decay half-life and β-delayed proton branching ratio yielded the Gamow-Teller
strength 0.35±0.05 for the mirror transition. Implications of the results on studies of deformation effects and on the path
of the rapid proton capture process are discussed.
Received: 26 September 2002 / Accepted: 30 October 2002 / Published online: 18 February 2003
RID="a"
ID="a"e-mail: jussi.huikari@phys.jyu.lfi
Communicated by D. Schwalm 相似文献
77.
J. Rissanen V. -V. Elomaa T. Eronen J. Hakala A. Jokinen S. Rahaman S. Rinta-Antila J. Äystö 《The European Physical Journal A - Hadrons and Nuclei》2007,34(2):113-118
The feasibility of the JYFLTRAP for in-trap spectroscopy has been studied. Several internally converted transitions have been
measured for isomers of fission products with good accuracy. High-resolution spectroscopic data free of source effects have
been obtained proving that trapped radioactive ions can provide excellent conversion electron sources. The shortest-lived
isomer studied in this work was 117m
Pd with a half-life of 19.1ms, for which a superior peak-to-total ratio and an excellent line shape at the 9.9keV conversion
electron line have been observed. Detection efficiencies and related phenomena of the present setup are analyzed. 相似文献
78.
H. Penttilä J. Äystö V.-V. Elomaa T. Eronen D. Gorelov U. Hager J. Hakala A. Jokinen A. Kankainen P. Karvonen T. Kessler I. Moore S. Rahaman S. Rinta-Antila V. Rubchenya T. Sonoda 《The European physical journal. Special topics》2007,150(1):317-318
A novel method to determine independent yields in proton induced fission employing ion counting after a Penning trap has
been developed.
A satisfactory agreement with previous measurements was found for independent yields of Cs isotopes in 50 MeV proton
induced fission. 相似文献
79.
Rodríguez D Kolhinen VS Audi G Aystö J Beck D Blaum K Bollen G Herfurth F Jokinen A Kellerbauer A Kluge HJ Oinonen M Schatz H Sauvan E Schwarz S 《Physical review letters》2004,93(16):161104
The mass of one of the three major waiting points in the astrophysical rp process 72Kr was measured for the first time with the Penning trap mass spectrometer ISOLTRAP. The measurement yielded a relative mass uncertainty of deltam/m=1.2x10(-7) (deltam=8 keV). (73,74)Kr, also needed for astrophysical calculations, were measured with more than 1 order of magnitude improved accuracy. We use the ISOLTRAP masses of 72-74Kr to reanalyze the role of 72Kr (T(1/2)=17.2 s) in the rp process during x-ray bursts and conclude that 72Kr is a strong waiting point delaying the burst duration with at least 80% of its beta-decay half-life. 相似文献
80.
Reeta?ViitalaEmail author Mika?Jokinen Sari?Tuusa Jarl?B.?Rosenholm Harry?Jalonen 《Journal of Sol-Gel Science and Technology》2005,36(2):147-156
Amorphous, sol-gel derived SiO2 are known to biocompatible and bioresorbable materials. Bioresorbable materials have potential applications as implants or
injectable matrices in the controlled delivery of biologically active agents in the living tissue. Bioresorbable matrices
provide desirable properties, e.g., extra removal operations that have to be done with biostable matrices are avoided and
the release of large therapeutic molecules can be controlled by matrix degradation rather than by diffusion. New important
groups of drugs, such as biotechnically-produced peptides and proteins, are potential to be encapsulated in bioresorbable
SiO2, because they are typically larger in size and their direct oral administration without protecting matrix is difficult due
to digestion. The methods to achieve a wide range of SiO2 bioresorption rates (from days to months) are introduced in this study. This is done by a “conventional” alkoxy-based sol-gel
method at protein-friendly conditions by adjusting the precursor ratios, aging of the sol and by using different preparation
methods (casting, spray-drying and freeze-drying). The prepared morphologies include implantable monolithic sticks and injectable
microspheres. The importance of chemical structure is shown in comparison with the specific surface area and pore volume. 相似文献