共查询到20条相似文献,搜索用时 31 毫秒
1.
R. Kumar Kuljeet Singh D. Mehta Nirmal Singh S. S. Malik E. S. Paul A. Görgen S. Chmel R. P. Singh S. Muralithar 《The European Physical Journal A - Hadrons and Nuclei》2005,24(1):13-22
The collective structures of 131Cs have been investigated by in-beam -ray spectroscopic techniques following the 124Sn (^11B , 4n) reaction at a beam energy Elab = 57MeV. The previously established rotational bands, built on g7/2, d5/2 and the unique-parity h11/2 orbitals, have been extended and evolve into new bands involving rotationally aligned (h11/2)2 and (h11/2)2 quasiparticles. In addition, a new multiquasiparticle band based on the g7/2 g7/2 h11/2 configuration has also been observed. Theoretical interpretations for the assigned configurations are discussed in the framework of Total Routhian Surface (TRS) and Tilted Axis Cranking (TAC) model calculations. TAC model calculations predict a decrease in the B(M1) values with increasing rotational frequency for the g7/2/d5/2 (h11/2)2 and h11/2 (h11/2)2 bands, thus indicating a magnetic rotation character for these bands. 相似文献
2.
T. Fukuchi Y. Gono A. Odahara S. Tanaka M. Inoue Y. Wakabayashi T. Sasaki M. Kibe N. Hokoiwa T. Shinozuka M. Fujita A. Yamazaki T. Sonoda C. S. Lee Y. K. Kwon J. Y. Moon J. H. Lee 《The European Physical Journal A - Hadrons and Nuclei》2005,24(2):249-257
The high-spin states of 93Mo have been studied by a 82Se( 16O, 5n) 93Mo reaction at a beam energy of 100 MeV using techniques of in-beam -ray spectroscopy. Measurements of -t, --t coincidences, -ray angular distributions and -ray linear polarizations were performed. The high-spin isomer was found as a (39/2-) state at about 9.7 MeV. The near-yrast states in 93Mo were interpreted using the weak-coupling picture of a d5/2 neutron to a neutron magic core nucleus 92Mo. 相似文献
3.
A. Syntfeld H. Mach W. Kurcewicz B. Fogelberg N. Amzal J. Galy K. Gulda A. Korgul A. Lindroth W. A. Płóciennik M. Sanchez-Vega W. Urban 《The European Physical Journal A - Hadrons and Nuclei》2005,23(3):481-490
The --decay of 147Cs to 147Ba has been studied by means of - and X-ray spectroscopy. A new level scheme of 147Ba is significantly modified and extended in comparison to the one previously reported. The Advanced Time-Delayed (t) method has been applied to measure half-lives of the 46.2 and 85.4 keV levels in 147Ba yielding T1/2 of 510(80) ps and 370(100) ps, respectively. The lifetime results combined with the deduced internal conversion coefficients allowed to assign M1 multipolarity to three transitions. The B(M1) values obtained for the 39.2, 46.2 and 85.4 keV transitions range from 0.017 to 0.043 W.u. and represent typical B(M1) strength in the Ba-Er region. Model calculations using a shell correction approach with the axially deformed Woods-Saxon potential predict for 147Ba an octupole deformed ground state with 3 = 0.11. 相似文献
4.
The -decay fine structure of 214Ac, 215Ac and 216Ac has been studied using the --coincidence technique. The nuclei were produced by 209Bi( 12C, xn)221-xAc-reactions. Evaporation residues were separated in-flight from the primary beam using the velocity filter SHIP at GSI, Darmstadt. The separated nuclei were implanted into a position-sensitive 16-strip PIPS Si detector and their subsequent decays were measured. In these studies new and improved decay data for 214-216Ac were obtained. 相似文献
5.
H. De Witte A. N. Andreyev S. Dean S. Franchoo M. Huyse O. Ivanov U. Köster W. Kurcewicz J. Kurpeta A. Plochocki K. Van de Vel J. Van de Walle P. Van Duppen 《The European Physical Journal A - Hadrons and Nuclei》2005,23(2):243-247
A new measurement of the 200Fr -decay half-life, with improved accuracy compared to previous measurements, has been carried out at the Isolde-CERN on-line mass separator. A half-life of 49(4) ms has been obtained, which is substantially different from earlier literature values. For the 196At daughter decay, a half-life of 389(54) ms and an branching ratio b = 94(5)% were measured. In addition, the half-lives of 201, 203, 205Fr and 197,199At are reported. 相似文献
6.
Excited states in 191Pt have been populated using the reaction 186W + 11B at 85MeV beam energy. Gamma-ray coincidences were measured using the EUROGAM-II spectrometer array. The level scheme has been extended considerably. Evidence for favoured structures of highly triaxial shape with -90° coexisting with oblate structures has been obtained by comparison with total Routhian surface and cranked shell model calculations. The presence of proton excitations in both positive- and negative-parity states has been confirmed. 相似文献
7.
P. Joshi A. R. Wilkinson T. Koike D. B. Fossan S. Finnigan E. S. Paul P. M. Raddon G. Rainovski K. Starosta A. J. Simons C. Vaman R. Wadsworth 《The European Physical Journal A - Hadrons and Nuclei》2005,24(1):23-29
Excited states in 100Tc have been studied using the 96Zr( 7Li, 3n) reaction at a beam energy of 27 MeV. In the present work, evidence has been found for a second I = 1 band decaying via several stretched dipole transitions to the previously known I = 1 negative-parity band. Comparison of these data with those in neighbouring nuclei and also against recently reported criteria for chiral bands in nuclei, suggests that the two structures can be interpreted as chiral partners. Core quasi-particle coupling model calculations show reasonable agreement with the data and generally support the chiral interpretation of the states. 相似文献
8.
L. Gaudefroy O. Sorlin C. Donzaud J. C. Angélique F. Azaiez C. Bourgeois V. Chiste Z. Dlouhy S. Grévy D. Guillemaud-Mueller F. Ibrahim K. -L. Kratz M. Lewitowicz S. M. Lukyanov I. Matea J. Mrasek F. Nowacki F. de Oliveira Santos Yu. -E. Penionzhkevich B. Pfeiffer F. Pougheon M. G. Saint-Laurent M. Stanoiu 《The European Physical Journal A - Hadrons and Nuclei》2005,23(1):41-48
The neutron-rich nuclei 2157, 58Sc, 2258-60Ti, 2360-63V, 2462-66Cr have been produced at Ganil via interactions of a 61.8A MeV 76Ge beam with a 58Ni target. Beta-decay studies have been performed using combined - and -ray spectroscopy. Half-lives have been determined and -decay schemes are proposed for 58Ti, 61V and 62Cr. From these studies, new hints for the existence of -decaying isomers in 60V and in 62Mn are provided. These results are compared to shell model calculations. The role of the f7/2- f5/2 proton-neutron interaction is examined through its influence on the lifetime values. 相似文献
9.
V. V. Gromak V. G. Avakyan F. S. Pashkovskii O. F. Lakhvich E. V. Skorodumov T. S. Khlebnikova 《Journal of Applied Spectroscopy》2003,70(1):14-26
The tautomerism, spectral properties, and properties of intramolecular hydrogen bonds in 2-formylcyclopentane-1,3-dione (FCPD) have been investigated by the methods of nonempirical quantum chemistry (calculations by the ab initio and DFT methods) and IR and 13C NMR spectroscopy. It is shown that FCPD in a crystalline form, as also does malonic dialdehyde, exists as self-associated enolized molecules with an open chelate ring. It is found that in solutions in CCl4 the compound investigated exists as an equilibrium mixture of its exo- and endoenolic forms, with predominance of the former. The IR spectra of the solutions of FCPD in CCl4 fix the presence of small amounts of the associate formed from the anionic and protonated forms of the substance. For the first time, the energies of the intramolecular H bonds of the endo- and exoenolic tautomeric forms in FCPD have been estimated theoretically. They appeared to be equal to 3.69 and 4.91 kcal·mole–1, respectively. The possible mechanisms of enol-enolic interconversions of FCPD have been discussed. 相似文献
10.
A. A. Akhrem O. V. Gulyakevich G. N. Lysenko A. L. Mikhalchuk G. B. Tolstorozhev 《Journal of Applied Spectroscopy》2001,68(5):719-726
By the method of IR Fourier spectroscopy with the use of numerical differentiation of spectral line profiles we have studied the spectra of some structural and functional derivatives of immunotropic 8-azasteroids in the region of C=O and C=C bonds (1800–1400 cm–1). We have established the dependence of vibration frequencies of the C=O and C=C groups on the size of the ring D, the presence of heteroatoms (O, S) in the ring D, transformations in the -acyl--aminovinylcarbonyl fragment and in its adjacent positions of the heterosteroid skeleton, and the composite character of the absorption bands that are due to the vibrations of the C=O and C=C groups. The role of the structural and stereoelectronic factors in the observed group frequencies of 8-azasteroids is discussed. 相似文献
11.
A. A. Pasternak E. O. Podsvirova R. M. Lieder S. Chmel W. Gast Ts. Venkova H. M. Jäger L. Mihailescu G. de Angelis D. R. Napoli A. Gadea D. Bazzacco R. Menegazzo S. Lunardi W. Urban Ch. Droste T. Morek T. Rzaca-Urban G. Duchêne A. Dewald 《The European Physical Journal A - Hadrons and Nuclei》2005,23(2):191-196
Lifetimes have been measured for dipole bands in 142Gd using DSAM. The deduced B(M1) and B(E2) values as well as B(M1)/B(E2) ratios are compared with calculations in the framework of the TAC (Tilted Axis Cranking) and SPAC (Shears mechanism with Principal Axis Cranking) models. The dipole bands DB1 to DB4 can be interpreted as magnetic rotational bands. 相似文献
12.
G. Canchel B. Blank M. Chartier F. Delalee P. Dendooven C. Dossat J. Giovinazzo J. Huikari A. S. Lalleman M. J. Lopez Jiménez V. Madec J. L. Pedroza H. Penttilä J. C. Thomas 《The European Physical Journal A - Hadrons and Nuclei》2005,23(3):409-415
In an experiment performed at the Accelerator Laboratory of the University of Jyväskylä, the -decay half-life of 62Ga has been studied with high precision using the IGISOL technique. A half-life of T1/2 = 116.09(17) ms was measured. Using - coincidences, the intensity of the 954 keV transition and an upper limit of the -decay feeding of the 0+2 state have been extracted. The present experimental results are compared to previous measurements and their impact on our understanding of the weak interaction is discussed. 相似文献
13.
M. Wolińska-Cichocka J. Kownacki W. Urban E. Ruchowska W. A. Płóciennik B. Bekman Ch. Droste W. Gast R. Lieder W. Meczyński M. Kisieliński A. Kordyasz M. Kowalczyk P. Kowina J. Iwanicki T. Morek J. Perkowski J. Srebrny A. Stolarz J. Styczeń 《The European Physical Journal A - Hadrons and Nuclei》2005,24(2):259-274
Excited states in 110Sn and 111Sn nuclei have been investigated using in-beam -ray spectroscopic methods. An 16O beam with an energy of 60-80MeV was used to bombard a 98Mo target. On the basis of the relative excitation functions, -ray angular distributions, - and -time distributions, -ray multiplicity and total energy data, the level schemes of 110Sn and 111Sn have been studied and extended up to Eexc 11.5MeV, I = 24, and Eexc 11.1MeV and I = (51/2), respectively. An extension of the intruder, g.s. and negative-parity bands, as well as 5 new band-like structures are proposed in 110Sn. The nature of newly introduced collective band 8 as well as 10+ states fed in the decay of the collective band is discussed. In the 111Sn nucleus an intruder band based on the 23/2- state has been reinvestigated and the extension of the g.s. band and second negative-parity band is given. Evidence for neutron-core coupling in 111Sn is found. The structure and systematics of excited states in light Sn isotopes is discussed. 相似文献
14.
Resonance Raman spectra (RRS) of Co(II) and Co(III)5,10,15,20tetrakis(4Nmethylpyridinium)porphyrin ((CoII(TmpyP4), and CoIII(TMPyP4)) in aqueous solutions at different pH as well as in organic solvents (methanol, ethanol, DMSO, DMF) are obtained. The increased sensitivity of the oscillation frequencies 2, 4, 8, and 6 — the markers of the oxidation state of a metal — to the nature of an axial ligand has been revealed. For CoIII(TmpyP4), the shifts of the indicated frequencies in extracoordination have turned out to be twofold larger than those for CoII(TmpyP4). The spectral effects observed are related to different electron influence of the extraligands on the system of the porphyrin ring. In the case of Co(III)porphyrin, interaction of the d
orbitals of the metal and the e
g
*orbitals of the macrocycle is more efficient since its ionic radius is smaller than for the Co(II)complex. For CoIII(TmpyP4), a linear correlation between the oscillation frequencies 2, 4, 8, and 6 and the experimental Gutmann parameters characterizing the electronacceptor properties of solvents is found. 相似文献
15.
Z. Janas C. Mazzocchi L. Batist A. Blazhev M. Górska M. Kavatsyuk O. Kavatsyuk R. Kirchner A. Korgul M. La Commara K. Miernik I. Mukha A. Płochocki E. Roeckl K. Schmidt 《The European Physical Journal A - Hadrons and Nuclei》2005,23(2):197-200
The -decays of 110Xe and 106Te were studied at the GSI on-line mass separator. By using the grow-in and decay of the activity, observed in pulsed-beam measurement, the half-life of 110Xe was found to be T1/2 = 105+35-25ms. The lifetime of 106Te was determined to be T1/2 = 70+20-10s by measuring the time between two successive 110Xe {106} Te {102} Sn -decays. The newly determined half-lives were used to calculate reduced -decay widths for 106Te and 110Xe. Universal systematics of reduced widths are proposed to search for the evidence of enhancement of the formation amplitude in the emitters above 100Sn. 相似文献
16.
The low-lying levels in 127La have been studied through the -decay of 127Ce ( T1/2 = 29s) produced by bombarding a natMo target with a 185-MeV 35Cl beam. Reaction products were on-line mass-separated, and -ray singles and - coincidence measurements were performed. Conversion electrons were also measured and multipolarities of transitions have been derived. The half-life of the 210.9-keV level was determined to be (1.9±0.3)ns by the - delayed coincidence technique. The level scheme obtained has been compared with calculations based on the Nilsson model. 相似文献
17.
M. Sawicka I. Matea H. Grawe R. Grzywacz M. Pfützner M. Lewitowicz J. M. Daugas B. A. Brown A. Lisetskiy F. Becker G. Bélier C. Bingham R. Borcea E. Bouchez A. Buta E. Dragulescu G. de France G. Georgiev J. Giovinazzo F. Hammache F. Ibrahim P. Mayet V. Méot F. Negoita F. De Oliveira-Santos O. Perru O. Roig K. Rykaczewski M. G. Saint-Laurent J. E. Sauvestre O. Sorlin M. Stanoiu I. Stefan C. Stodel Ch. Theisen D. Verney J. Żylicz 《The European Physical Journal A - Hadrons and Nuclei》2004,22(3):455-459
A decay spectroscopy study of the neutron-rich cobalt isotopes has been performed using fragmentation of a 86Kr36+ beam and the new LISE2000 spectrometer at GANIL. For 71Co and 73Co, the -delayed radiation has been observed for the first time, and the half-lives were found to be 79(5) ms and 41(4) ms, respectively. Features of the decay are discussed qualitatively in terms of nuclear models. 相似文献
18.
The 111Tc nucleus, populated in the spontaneous fission of 248Cm, was studied by means of prompt -ray spectroscopy using the EUROGAM2 array. Excited states in 111Tc were observed for the first time. Systematics of energy levels in odd-A Tc isotopes, obtained in our study of 107Tc and 109Tc provide a reliable spin and parity assignment I = 5/2+ to the head of the new band in 111Tc, interpreted as the 5/2+[422] orbital originating from the proton g9/2 shell. This level is most likely the ground state. Therefore, the (9/2+,7/2+) spin-parity assignment to the ground state of 111Tc, reported previously, is unlikely. Properties of the yrast band in 111Tc suggest prolate deformation of this band. There are hints that the deformation of 111Tc is larger than that of 109Tc, possibly due to admixtures of oblate-deformed configurations, which lower their excitation energy with increasing neutron number. 相似文献
19.
A superdeformed band has been observed in the N = 108 isotope 190Pb. This is the most neutron-deficient Pb isotope in which superdeformed states have been observed. Several theoretical approaches have predicted that N = 108 will mark the limit of observable superdeformation in the Pb isotopes. The band, which consists of five (possibly six) transitions, is observed to feed at least one isomeric level in its decay to the ground state. This decay pattern supports a spin assignment of 10 for the lowest observed level. 相似文献
20.
The -decay fine structure of 210-214Fr has been studied by --coincidence measurements. The nuclei were produced using the 12C on 209Bi reaction. Evaporation residues recoiling out of the target were separated in-flight by the velocity filter SHIP and stopped in a position-sensitive 16-strip PIPS-detector in order to study their subsequent decays. In the present work new and improved results for 210-214Fr, produced by -decay of the primary reaction products 214-218Ac, were extracted. The results are discussed and compared to previously published data. 相似文献