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1.
An effective residual interaction between particles and holes for shell model calculations around 208Pb, derived from the interaction between free nucleons, is compared with the measured properties of proton-hole neutron states
in 208Tl and the interaction between proton holes is adjusted to newly measured level energies in 206Hg. These interaction elements are particularly relevant for neutron-rich nuclei. The adjustment of two mixing elements reproduces
the known γ-decay data in 208Tl.
Received: 2 April 2002 / Accepted: 2 May 2002 相似文献
2.
A.?N.?WilsonEmail author G.?D.?Dracoulis A.?P.?Byrne P.?M.?Davidson G.?J.?Lane R.?M.?Clark P.?Fallon A.?G?rgen A.?O.?Macchiavelli D.?Ward 《The European Physical Journal A - Hadrons and Nuclei》2005,24(2):179-183
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
3.
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
4.
J. Benlliure T. Kurtukian-Nieto L. Audouin B. Blank F. Becker E. Casarejos D. Cortina M. Fernández-Ordóñez J. Giovinazzo D. Henzlova B. Jurado J. Pereira F. Rejmund K.-H. Schmidt O. Yordanov 《The European physical journal. Special topics》2007,150(1):309-310
The production of heavy neutron-rich nuclei is investigated using cold-fragmentation reactions.
More than 25 new heavy neutron-rich nuclei were produced in the fragmentation of 208Pb projectiles at 1 A GeV impinging a
beryllium target. The precise measurement of their production cross sections enables to benchmark the predictive power of
different
model calculations and make reliable predictions of the production rates expected in future radioactive beam facilities. 相似文献
5.
J. Khuyagbaatar S. Hofmann F. P. Heßberger D. Ackermann S. Antalic H. G. Burkhard S. Heinz B. Kindler A. F. Lisetskiy B. Lommel R. Mann K. Nishio H. J. Schött B. Sulignano 《The European Physical Journal A - Hadrons and Nuclei》2007,34(4):355-361
Isomeric states in 214Th and 213Th were identified by means of γ -rays measured in delayed coincidence with the implanted evaporation residues. These were
produced in irradiations of 164Dy with 54Cr projectiles and separated in-flight by the velocity filter SHIP. An isomeric state of I
π = 8+ with a half-life of (1.24±0.12) μs was identified in 214Th . The configuration π[1h
9/2 ⊗ 2f
7/2] was assigned to this state. An isomeric state with a half-life of (1.4±0.4) μs was observed in 213Th . Tentatively it was assigned to an I
π = 13/2+ state. 相似文献
6.
In this paper, we present a novel local-world model of wireless sensor networks (WSN) with two kinds of nodes: sensor nodes and sink nodes, which is different from other models with identical nodes and links. The model balances energy consumption by limiting the connectivity of sink nodes to prolong the life of the network. How the proportion of sink nodes, different energy distribution and the local-world scale would affect the topological structure and network performance are investigated. We find that, using mean-field theory, the degree distribution is obtained as an integral with respect to the proportion of sink nodes and energy distribution. We also show that, the model exhibits a mixed connectivity correlation which is greatly distinct from general networks. Moreover, from the perspective of the efficiency and the average hops for data processing, we find some suitable range of the proportion p of sink nodes would make the network model have optimal performance for data processing. 相似文献
7.
T.?KutsarovaEmail author C.?Schück E.?Gueorguieva A.?Minkova I.?Zartova F.?Hannachi A.?Korichi A.?Lopez-Martens 《The European Physical Journal A - Hadrons and Nuclei》2005,23(1):69-78
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
8.
A. Prévost N. Buforn A. Astier R. Duffait M. Meyer S. Perriès N. Redon O. Stézowski A. Bauchet I. Deloncle M.G. Porquet A. Görgen H. Hübel E. Mergel S. Neumann D. Roßbach N. Nenoff G. Schönwaßer A.N. Wilson R. Lucas F.A. Beck D. Curien G. Duchêne B.J.P. Gall N. Kintz J.P. Vivien D.M. Cullen 《The European Physical Journal A - Hadrons and Nuclei》2001,10(1):13-19
We report the identification of six new superdeformed (SD) bands in 197,198Pb observed with the EUROBALL IV spectrometer. The results are interpreted in the framework of cranked Hartree-Fock calculations
with approximate projection on the particle number by means of the Lipkin-Nogami method. A mixing between quasi-particle excitations
and an octupole vibration is suggested in the two SD isotopes. We have estimated the ordering of the neutron valence orbitals
and confirm indirectly a N = 118 SD gap.
Received: 20 December 2000 / Accepted: 24 January 2001 相似文献
9.
10.
ABSTRACTIn this work, seven novel sensitisers with the donor-acceptor-π-spacer-acceptor (D-A-π-A) structure were designed based on the C219 dye by introducing different electron-withdrawing substituents, and their photovoltaic parameters were predicted by density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations coupled with the Marcus charge transfer model. Results showed that the introduction of electron-withdrawing substituents can narrow the HOMO–LUMO gap, and remarkably enhance the dye's sunlight absorption. By exactly estimating the charge transfer rates and efficiency in electron injection and recombination processes, the photoelectric conversion efficiency (PCE) for the C219 dye was estimated to be about 7.4% under the standard AM 1.5G solar radiation, which is in excellent agreement with its measured value of 7.6%, suggesting that our calculation scheme is reliable. Moreover, we predicted that the PCE values for most designed dyes are over 10%, indicating that the molecular design strategy used by us in this work is reasonable. Especially, the PCE of dye 1, and 4 were predicted to be as high as 13.0% and 15.7% respectively, illuminating that the –CF3 and –CN are excellent substituents. Totally, our results revealed that the dye 1 and 4 are potential candidates as efficient sensitisers, and worth further study by experiments. 相似文献