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A. Botvina I. N. Mishustin M. Blann M. G. Mustafa G. Peilert H. Stöcker W. Greiner 《Zeitschrift für Physik A Hadrons and Nuclei》1993,345(3):297-303
Comparative analysis of three typical models of nuclear disintegration, the statistical multifragmentation model (SMM), the quantum statistical model (QSM) and a generalized evaporation model (GEM), is carried out. The thermodynamical properties of a decaying system as well as observable characteristics in heavy ion collisions predicted by the different models are discussed. It is shown that these models yield quite similar results for low charge yields at higher excitation energies (E/A>6 MeV per nucleon) and it is suggested that the coincidence measurements of the intermediate mass fragment multiplicity and the neutron and proton multiplicity (or alternatively, the total bound charge) may be very useful for deducing the decay mechanism. The GEM is shown to differ from the other models in predicting a high Z residue peak. 相似文献
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A series of closely related dinuclear (head-head) PtII complexes of general composition cis-[a2PtL2Pta′2]2+ with a,a′ = NH3 or CH3NH2 and L = 1-methyluracilate-N3,O4 (1-MeU) or 1-methylthyminate-N3,O4 (1-MeT) has been prepared and the solution behavior toward CeIV oxidation studied. The X-ray crystal structure of a representative example cis-[(CH3NH2)2Pt(1-MeU)2Pt(CH3NH2)2](ClO4)2 · 0.5 H2O ( 1b ), has been determined: Monoclinic, space group P21/c, a = 11.907(7) Å, b = 19.087(14) Å, c = 12.525(7) Å, β = 90.49(4)°, Z = 4. Oxidation of these diplatinum(II) complexes ([Pt2.0]2) with CeIV in aqueous solution to the corresponding diplatinum(III) species ([Pt3.0]2) proceeds via tetranuclear [Pt2.25]4 or dinuclear [Pt2.5]2 mixed-valence state compounds, depending on the nature of the a′ ligands: with a′ = NH3, blue green [Pt2.25]4 forms, whereas with a′ = CH3NH2, purple [Pt2.5]2 represents the intermediate. This difference is interpreted in terms of differences in bulk between NH3 and CH3NH2 ligands trans to the O(4) positions of the bridging nucleobases which influence the ability of dinuclear species to associate via the O(4)2 Pt a2′ faces. 相似文献
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Partlan MD Albergo S Bieser F Brady FP Caccia Z Cebra D Chacon AD Chance J Choi Y Costa S Elliott JB Gilkes ML Hauger JA Hirsch AS Hjort EL Insolia A Justice M Keane D Kintner J Lisa MA Matis HS McMahan M McParland C Olson DL Peilert G Porile NT Potenza R Rai G Rasmussen J Ritter HG Romanski J Romero JL Russo GV Scharenberg RP Scott A Shao Y Srivastava BK Symons TJ Tincknell ML Tuvé C Wang S Warren PG Wieman HH Wolf K 《Physical review letters》1995,75(11):2100-2103
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Tsang MB Hsi WC Lynch WG Bowman DR Gelbke CK Lisa MA Peaslee GF Kunde GJ Begemann-Blaich ML Hofmann T Hubele J Kempter J Kreutz P Kunze WD Lindenstruth V Lynen U Mang M Müller WF Neumann M Ocker B Ogilvie CA Pochodzalla J Rosenberger F Sann H Schüttauf A Serfling V Stroth J Trautmann W Tucholski A Wörner A Zude E Zwieglinski B Aiello S Immé G Pappalardo V Raciti G Charity RJ Sobotka LG Iori I Moroni A Scardoni R Ferrero A Seidel W Blaich T Stuttge L Cosmo A Friedman WA Peilert G 《Physical review letters》1993,71(10):1502-1505
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Canonical Metropolis simulations of nuclear matter at finite temperatures are made with a quasi-classical many-body model. It is demonstrated that considerable clustering develops at subsaturation densities. This effect lowers the energy by several MeV per nucleon, for temperatures below ≈8 MeV. This result will modify previous simple estimates of the critical parameters of the liquid-vapour phase transition. 相似文献
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