排序方式: 共有26条查询结果,搜索用时 15 毫秒
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Schmidt R Blaich T Elze TW Emling H Freiesleben H Grimm K Henning W Holzmann R Keller JG Klingler H Kulessa R Kratz JV Lambrecht D Lange JS Leifels Y Lubkiewicz E Moore EF Wajda E Prokopowicz W Schütter C Spies H Stelzer K Stroth J Walus W Wollersheim HJ Zinser M Zude E 《Physical review letters》1993,70(12):1767-1770
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E. Lubkiewicz H. Emling H. Grein R. Kulessa R. S. Simon H. J. Wollersheim Ch. Ender J. Gerl D. Habs D. Schwalm 《Zeitschrift für Physik A Hadrons and Nuclei》1990,335(4):369-377
Aγ-γ coincidence technique has been developed forg-factor measurements of short-lived nuclear states. The method involvesγ-detection in 4π geometry as well as transient magnetic fields and the recoil-distance technique. A first experiment was performed for the isotope160Yb produced in the reaction64Ni(100Mo, 4n) at 430 MeV beam energy. The valueg=? 0.23(31) of the 14+ yrast state, which is compatible with zero, establishes thevi 13/2 quasiparticle structure to be responsible for the first backbend. A meang-factor for low spin states around the 4+ state,g=+0.48(26) was also derived as well as lifetimes for yrast states up toI π=8+. 相似文献
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P.J. Daly C.T. Zhang P. Bhattacharyya R. Broda Z.W. Grabowski D. Nisius I. Ahmad M.P. Carpenter L.R. Morss W.R. Phillips J.L. Durell M.J. Leddy A.G. Smith W. Urban B.J. Varley N. Schulz E. Lubkiewicz M. Bentaleb J. Blomqvist 《Zeitschrift für Physik A Hadrons and Nuclei》1997,358(2):203-204
Prompt γ-ray cascades in neutron-rich nuclei around doubly-magic 132Sn have been studied using a 248Cm fission source. Yrast states located in the N = 82 isotones 134Te and 135I are interpreted as valence proton and neutron particle-hole core excitations with the help of shell model calculations employing empirical nucleon-nucleon interactions from both 132Sn and 208Pb regions. 相似文献
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Yu. N. Kopatch M. Mutterer P. Jesinger J. von Kalben I. Kojouharov H. Schaffner H. -J. Wollersheim N. Kurz E. Lubkiewicz P. Adrich H. Sharma A. Wagner Z. Mezentseva W. H. Trzaska A. Krasznahorkay F. Gönnenwein 《Acta Physica Hungarica A》2003,18(2-4):399-402
A new multiparameter experiment on ternary fission of 252Cf has recently been successfully performed by using the CODIS2 detector system and two GSI segmented Super Clover Ge γ-ray detectors. The experimental setup and the main subjects of interest are briefly described. 相似文献
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W. Urban J.L. Durell W.R. Phillips A.G. Smith M.A. Jones I. Ahmad A.R. Barnett M. Bentaleb S.J. Dorning M.J. Leddy E. Lubkiewicz L.R. Morss T. Rzaca-Urban R.A. Sareen N. Schulz B.J. Varley 《Zeitschrift für Physik A Hadrons and Nuclei》1997,358(2):145-151
Prompt γ radiation following spontaneous fission has been measured using the EUROGAM 2 array. Using these data and newly developed analysis techniques a number of subjects were studied, which are briefly discussed. One of these subjects, shape transition in A≈100 Sr and Zr nuclei is discussed in more detail. Quadrupole moments were determined for rotational bands in the N=58,59,60,62 and 64 Sr and Zr isotopes. Deformation parameters, which increase from β2 ≈ 0.1 at N=56 to β2 ≈ 0.4 at N=64, suggest that in strontium and zirconium isotopes shape change happens gradually between N=56 and N=62 and is probably due to an occupancy of three or more deformation-driving orbitals of h11/2 parentage. 相似文献
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M. Bentaleb E. Lubkiewicz N. Schulz J. L. Durell F. Lidén C. J. Pearson W. R. Phillips J. Shannon B. J. Varley C. J. Lister I. Ahmad L. R. Morss K. L. Nash C. W. Williams 《Zeitschrift für Physik A Hadrons and Nuclei》1994,348(4):245-246
High-spin structures in the neutron-rich nuclei138Xe and139Xe have been investigated by observing prompt γ -rays from the spontaneous fission of248Cm with the Eurogam spectrometer. The partial level schemes were constructed on the basis of double-, triple- and quadruple-γ coincidences. The ground state band in138Xe has been extended up to 5 MeV excitation energy. The structure of the newly observed medium-spin states in139Xe is similar to the one of heavier N=85 isotones where vf 7 2/3 , vh9/2f 7 2/2 and vf 7 2/3 ? 3? multiplets have been observed. 相似文献
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D. Lambrecht T. Blaich T. W. Elze H. Emling H. Freiesleben K. Grimm W. Henning R. Holzmann J. G. Keller H. Klingler J. V. Kratz R. Kulessa S. Lange Y. Leifels E. Lubkiewicz E. F. Moore W. Prokopowicz R. Schmidt C. Schütter H. Spies K. Stelzer J. Stroth E. Wajda W. Waluś M. Zinser E. Zude 《Zeitschrift für Physik A Hadrons and Nuclei》1994,350(2):115-120
We investigate the beam energy dependence of neutron and proton squeeze-out in collisions of197Au+197Au atE/A=400—800 MeV. The azimuthal anisotropy that describes the enhanced emission of mid-rapidity neutrons perpendicular to the reaction plane rises strongly with the transverse momentum of the neutrons. This dependence of the azimuthal anisotropy follows a universal curve — independent of beam energy — if the neutron momenta are measured in fractions of the projectile momentum per mass unit. Analogously, the kinetic energy spectra of mid-rapidity neutrons exhibit a universal behaviour as a function of the kinetic energy of the projectile.
The members of the FOPI-collaboration: J.P. Alard, Z. Basrak, N. Bastid, I.M. Belayev, M. Bini, R. Bock, A. Buta, R. aplar, C. Cerruti, N. Cindro, J.P. Coffin, M. Crouau, P. Dupieux, J. Erö, Z.G. Fan, P. Fintz, Z. Fodor, R. Freifelder, L. Fraysse, S. Frolov, A. Gobbi, Y. Grigorian, G. Guillaume, N. Herrmann, K.D. Hildenbrand, S. Hölbling, O. Houari, S.C. Jeong, M. Jorio, F. Jundt, J. Kecskemeti, P. Koncz, Y. Korchagin, R. Kotte, M. Krämer, C. Kuhn, I. Legrand, A. Lebedev, C. Maguire, V. Manko, T. Matulewicz, G. Mgebrishvili, J. Mösner, D. Moisa, G. Montarou, P. Morel, W. Neubert, A. Olmi, G. Pasquali, D. Pelte, M. Petrovici, G. Poggi, F. Rami, W. Reisdorf, A. Sadchikov, D. Schüll, Z. Seres, B. Sikora, V. Simion, S. Smolyankin, U. Sodan, N. Taccetti, K. Teh, R. Tezkratt, M. Trzaska, M.A. Vasiliev, P. Wagner, J.P. Wessels, T. Wienold, Z. Wilhelmi, D. Wohlfarth, A.V. Zhilin. 相似文献
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T. Rzaca-Urban W. Urban A. Kaczor J.L. Durell M.J. Leddy M.A. Jones W.R. Phillips A.G. Smith B.J. Varley I. Ahmad L.R. Morss M. Bentaleb E. Lubkiewicz N. Schulz 《The European Physical Journal A - Hadrons and Nuclei》2000,9(2):165-169
Neutron-rich, 88-94Kr nuclei, populated in spontaneous fission of 248Cm, have been studied with EUROGAM 2, by measuring prompt γ-rays. Many new excited states in even-even Kr isotopes have been
identified. For the first time spins and parities were determined experimentally in these nuclei. Our results indicate that
the quadrupole deformation of Kr isotopes will appear only above N = 58, as observed in Sr and Zr nuclei. The newly found 3- level at 1506.4 keV in 90Kr suggests the exsistence of a new region of increased octupole correlations, probably associated with the ν(d
5/2
h
11/2) pair of Δl = Δj = 3 orbitals.
Received: 18 September 2000 / Accepted: 18 October 2000 相似文献
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A Leistenschneider T Aumann K Boretzky D Cortina J Cub U Datta Pramanik W Dostal T W Elze H Emling H Geissel A Grünschloss M Hellstr R Holzmann S Ilievski N Iwasa M Kaspar A Kleinb?hl J V Kratz R Kulessa Y Leifels E Lubkiewicz G Münzenberg P Reiter M Rejmund C Scheidenberger C Schlegel H Simon J Stroth K Sümmerer E Wajda W Walús S Wan 《Physical review letters》2001,86(24):5442-5445
The dipole response of stable and unstable neutron-rich oxygen nuclei of masses A = 17 to A = 22 has been investigated experimentally utilizing electromagnetic excitation in heavy-ion collisions at beam energies about 600 MeV/nucleon. A kinematically complete measurement of the neutron decay channel in inelastic scattering of the secondary beam projectiles from a Pb target was performed. Differential electromagnetic excitation cross sections d sigma/dE were derived up to 30 MeV excitation energy. In contrast to stable nuclei, the deduced dipole strength distribution appears to be strongly fragmented and systematically exhibits a considerable fraction of low-lying strength. 相似文献