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31.
For solving 3D high order hierarchical FE systems the block SSOR preconditioned CG algorithms based on new stripwise block two-color orderings of degrees of freedom and providing for efficient concurrent/vector implementation are suggested. As demonstrated by numerical results for the 3D Navier equations approximated using hierarchical orderp, 2 p 5, FE's the convergence rate of such BSSOR-CG algorithms is only slightly dependent onp and mesh nonunformity. 相似文献
32.
S. Hofmann F.P. Heßberger D. Ackermann S. Antalic P. Cagarda S. Ćwiok B. Kindler J. Kojouharova B. Lommel R. Mann G. Münzenberg A.G. Popeko S. Saro H.J. Schött A.V. Yeremin 《The European Physical Journal A - Hadrons and Nuclei》2001,10(1):5-10
The even-even nucleus 270110 was synthesized using the reaction 64Ni + 207Pb. A total of eight α-decay chains was measured during an irradiation time of seven days. Decay data were obtained for the
ground-state and a high-spin K isomer. The new nuclei 266Hs and 262Sg were identified as daughter products after α-decay. Spontaneous fission of 262Sg terminates the decay chain. The measured data are in agreement with calculations using the macroscopic-microscopic model
and with self-consistent HFB calculations with Skyrme-Sly4 interaction.
Received: 27 November 2000 / Accepted: 16 January 2001 相似文献
33.
A. S. Fomichev V. Chudoba A. V. Daniel M. S. Golovkov V. A. Gorshkov S. A. Krupko Yu. Ts. Oganessian G. S. Popeko S. I. Sidorchuk R. S. Slepnev G. M. Ter-Akopian R. Wolski V. I. Chepigin D. E. Katrasev O. N. Malyshev A. I. Svirikhin A. V. Yeremin Ch. Brian?on K. Hauschild A. Korichi M. -H. Ha F. Hanappe O. Dorvaux L. Stuttge 《Physics of Particles and Nuclei Letters》2012,9(6-7):496-501
Complete fusion (CF) and incomplete fusion (ICF) reactions were studied for the cases of the loosely bound 6He and 6Li projectiles bombarding 166Er and 165Ho targets at energy of about 10 MeV/nucleon. Experiments were carried out to test an approach exploiting the measured intensities of ?? rays emitted at the transitions between the yrast-band levels of reaction products formed after the termination of neutron evaporation. Partial waves feeding the CF reactions 165Ho (6Li, 5 n) 166Yb and 166Er(6He, 6 n) 166Yb as well as ICF 165Ho (6Li, ??3n) 164Er and 166Er(6He, ??4n) 164Er reaction channels were revealed from the obtained ??-ray data. The method of exit channel identification via the triple coincidence (??1-??2-light charged particle) was employed for these reactions study. 相似文献
34.
F. P. Heßberger S. Hofmann D. Ackermann S. Antalic B. Kindler I. Kojouharov P. Kuusiniemi M. Leino B. Lommel R. Mann K. Nishio A. G. Popeko B. Sulignano S. Saro B. Streicher M. Venhart A. V. Yeremin 《The European Physical Journal A - Hadrons and Nuclei》2006,29(2):165-173
The decay of 255No was investigated by means of α-γ spectroscopy. The isotope was produced in the reactions 208Pb(48Ca, n)255No,
, and $238U(22Ne, 5n)255No$. Levels of the daughter nucleus 251Fm were assigned by α-γ coincidence measurements and on the basis of systematics. Level energies were determined precisely
using measured γ-rays. The results are compared with the known level schemes of the lighter
isotones 247Cm and 249Cf as well as with data for 253No. 相似文献
35.
A. Yeremin O. Malyshev A. Popeko A. Lopez-Martens K. Hauschild O. Dorvaux S. Saro D. Pantelica S. Mullin 《Pramana》2010,75(1):3-12
Detailed spectroscopic information of excited nuclear states in deformed transfermium nuclei is scarce. Most of the information
available today has been obtained from investigations of fine-structure α-decay. Although α decay gives access to hindrance factors and lifetimes which are strongly correlated to shell/subshell closures and the presence
of isomers, only the combined use of γ and conversion electron spectroscopy allows the precise determination of excitation energy, spin and parity of nuclear levels. 相似文献
36.
A. Lopez-Martens T. Wiborg-Hagen K. Hauschild M.L. Chelnokov V.I. Chepigin D. Curien O. Dorvaux G. Drafta B. Gall A. Görgen M. Guttormsen A.V. Isaev I.N. Izosimov A.P. Kabachenko D.E. Katrasev T. Kutsarova A.N. Kuznetsov A.C. Larsen O.N. Malyshev A. Minkova S. Mullins H.T. Nyhus D. Pantelica J. Piot A.G. Popeko S. Saro N. Scintee S. Siem N.U.H. Syed E.A. Sokol A.I. Svirikhin A.V. Yeremin 《Nuclear Physics A》2011
New high-statistics data have been obtained on the decay properties of 253No and its daughters using the reaction 207Pb(48Ca, 2n)253No. This was made possible thanks to an improved transmission of fusion–evaporation residues through the VASSILISSA recoil separator and an increased efficiency of the GABRIELA detector setup. The decay schemes of 253No and 249Fm have been revisited. The known level scheme of 249Fm has been confirmed, including a new level at 669 keV excitation energy. The observation of L X-rays in coincidence with the α decay of 249Fm gives additional support to the ground-state configuration of 1/2+[631] instead of 5/2+[622] for 245Cf. In both 249Fm and 245Cf, the interpretation of the data has been checked by comparing experimental α-particle and γ-ray spectra with realistic simulations of the decay cascades and of the interaction of particles and photons in the detectors of GABRIELA. The population of a 0.7 ms isomeric state attributed to 253No is confirmed by an α-tagged calorimetric measurement and the corresponding γ and electron decay spectra are presented. Possible evidence for more than one isomer is given and a tentative partial decay scheme is discussed in the light of the available experimental data, systematics and theoretical expectations. 相似文献
37.
Svirikhin A. I. Andreev A. V. Yeremin A. V. Zamyatin N. I. Izosimov I. N. Isaev A. V. Kuznetsov A. N. Kuznetsova A. A. Malyshev O. N. Popeko A. G. Popov Y. A. Sokol E. A. Tezekbayeva M. S. Chelnokov M. L. Chepigin V. I. Schneidman T. M. Andel B. Antalic S. Bronis A. Mosat P. Gall B. Dorvaux O. Retailleau B. M. Hauschild K. Lopez-Martenz A. Chauveau P. Stefanova E. Tonev D. 《Physics of Particles and Nuclei Letters》2019,16(6):768-771
Physics of Particles and Nuclei Letters - The neutron yield from the spontaneous fission of the short-lived neutron-deficient 254Rf nucleus produced in the complete fusion reaction with the beam of... 相似文献
38.
F. P. He?berger S. Hofmann B. Streicher B. Sulignano S. Antalic D. Ackermann S. Heinz B. Kindler I. Kojouharov P. Kuusiniemi M. Leino B. Lommel R. Mann A. G. Popeko ?. ?áro J. Uusitalo A. V. Yeremin 《The European Physical Journal A - Hadrons and Nuclei》2009,41(2):145-153
In a series of experiments performed at the velocity filter SHIP, new or improved decay data of neutron-deficient isotopes
of elements from mendelevium (Z = 101) to hassium (Z = 108) were obtained. In particular, evidence for -decay or electron capture from isomeric states in 265Hs and 258Db was found. 相似文献
39.
40.
A. I. Svirikhin A. V. Yeremin A. V. Andreev I. N. Izosimov A. V. Isaev A. N. Kuznetsov A. A. Kuznetsova O. N. Malyshev A. G. Popeko Y. A. Popov E. A. Sokol M. L. Chelnokov V. I. Chepigin T. M. Schneidman B. Gall O. Dorvaux P. Brione K. Hauschild A. Lopez-Martenz K. Rezynkina S. Mullins P. Jones P. Mosat B. Andel Z. Kalaninova M. Z. Asfari N. Yoshihiro J. Piot E. Stefanova D. Tonev 《Bulletin of the Russian Academy of Sciences: Physics》2018,82(6):632-636
series of experiments performed in 2014–2015 using the SHELS separator and a beam of multicharged ions from the U-400 accelerator at the Flerov Laboratory of Nuclear Reactions (Joint Institute for Nuclear Research) in Dubna is described. In preparation for a large program of experiments with a beam of highly charged ions of 50Ti, an experiment is performed to study the spontaneous fissioning (SF) of short-lived neutron-deficient isotope 256Rf formed in complete fusion reaction50Ti + 208Pb = 256Rf + 2n. The half-life of 256Rf is measured along with the probability of its SF decay. The average number of neutrons per one event of 256Rf SF (\(\bar v\)= 4.47 ± 0.09) is obtained for the first time. The results from experiments to study the SF of short-lived neutron-deficient isotopes synthesized in complete fusion reaction 48Ca + 204Pb → 252No* are presented as well. Two short-lived activities attributed to the SF of the ground and isomeric states of 250No are revealed. The half-life, total kinetic energies of fission fragments, and neutron multiplicities are measured for the obtained short-lived nuclei. The average numbers of neutrons per one SF event are \(\bar v\)= 4.38 ± 0.13 and \(\bar v\)= 3.90 ± 0.20, respectively, for SF activity with t1/2 = 5.1 ± 0.3 and t1/2 = 36 ± 3 μs. 相似文献