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排序方式: 共有91条查询结果,搜索用时 15 毫秒
1.
Yu. V. Pyatkov V. V. Pashkevich W. H. Trzaska G. G. Adamian N. V. Antonenko D. V. Kamanin V. A. Maslov V. G. Tishchenko A. V. Unzhakova 《Physics of Atomic Nuclei》2004,67(9):1726-1730
An analysis of the preferable fission path manifesting itself as a fine structure of the total kinetic energy-mass distribution of the fission fragments compelled us to put forward an absolutely new shape of the fissioning system on the descent from the fission barrier. It is a multicomponent nuclear molecule constituted by two magic clusters and a torus-like neck between. 相似文献
2.
M. Leino J. Uusitalo T. Enqvist K. Eskola A. Jokinen K. Loberg W. H. Trzaska J. Äystö 《Zeitschrift für Physik A Hadrons and Nuclei》1994,348(2):151-152
Two new neutron-deficient isotopes207,208Ac have been produced in fusion reactions with 5.2–5.6 MeV/nucleon40Ar ions on175Lu and identified on the basis of genetic correlations. The fusion evaporation products were separated on-line using a gas-filled magnetic recoil separator. The alpha energy and half-life of208Ac were determined to be (7572±15) keV and (95 ?16 +24 ) ms, respectively. A new alpha line with a half-life of (25 ?5 +9 ) ms and an energy of (7758±20) keV is assigned to the decay of an isomeric state in208Ac. Another new activity with a half-life of (22 ?9 +40 ) ms and an alpha energy of (7712±25) keV is assigned to207Ac. 相似文献
3.
M. Leino J. Uusitalo R. G. Allatt P. Armbruster T. Enqvist K. Eskola S. Hofmann S. Hurskanen A. Jokinen V. Ninov R. D. Page W. H. Trzaska 《Zeitschrift für Physik A Hadrons and Nuclei》1996,355(1):157-164
Neutron-deficient isotopes of radium have been produced in the reactions35Cl+175Lu,40Ar+170,171Yb, and36Ar+170,171Yb and separated in-flight with a gas-filled recoil separator. The activities have been identified on the basis of correlated alpha decay chains. The alpha particle energy Eα and the half-life T1/2 of an isomeric state of the new isotope,203m Ra, have been determined to be (7615±20) keV and (33 ?10 +22 ) ms, respectively. An assignment of another decay with Eα = (7577±20) keV and T1/2=(1.1 ?0.5 +5.0 ) ms to203g Ra is made on the basis of one observed three-decay chain. Tentative evidence for the production of the new isotope202Ra is also given. The values Eα = (7860±60) keV and T1/2=(0.7 ?0.3 +3.3 ) ms were measured. Improved decay data have been obtained for204Ra. The results are Eα = (7484±10) keV and T1/2=(59 ?9 +12 ) ms. Earlier findings concerning the decay of two states in205Ra and an isomer in207Ra have been confirmed. Approximate values for cross sections have been determined for202Ra, produced using the36Ar+170Yb reaction and for203Ra,204Ra, and205Ra using the35Cl+175Lu reaction. The results are 2 nb (202Ra), 4 nb (203Ra), 40 nb (204Ra), and 800 nb (205Ra). 相似文献
4.
5.
G. N. Knyazheva M. G. Itkis S. V. Khlebnikov E. M. Kozulin V. G. Lyapin V. A. Rubchenya W. Trzaska 《Physics of Particles and Nuclei Letters》2008,5(1):21-28
The mass-energy and angular distributions of binary fissionlike fragments produced in the reactions 44Ca + 206Pb and 64Ni + 186W, leading to the same compound nucleus 250No, have been measured at excitation energies of 30 and 40 MeV. The presence of the quasifission component was observed for both systems. But in the case of the 64Ni ion, the quasifission process dominates, while in the case of the 44Ca ion, the main process is the fusion-fission of compound nucleus 250No. From the angular distributions of reaction fragments, the time scales were found for quasifission and fusion-fission for both reactions. 相似文献
6.
R.-D. Herzberg N. Amzal J.E. Bastin F. Becker P.M.T. Brew P.A. Butler A.J.C. Chewter J.F.C. Cocks O. Dorvaux K. Eskola J. Gerl P.T. Greenlees N.J. Hammond K. Hauschild K. Helariutta F. Heßberger M. Houry A. Hürstel R.D. Humphreys G.D. Jones P.M. Jones R. Julin S. Juutinen H. Kankaanpää H. Kettunen T.L. Khoo W. Korten P. Kuusiniemi Y. Le Coz M. Leino A.P. Leppänen C.J. Lister R. Lucas M. Muikku P. Nieminen R.D. Page T. Page P. Rahkila P. Reiter Ch. Schlegel C. Scholey G. Sletten O. Stezowski Ch. Theisen W.H. Trzaska J. Uusitalo H.J. Wollersheim 《The European Physical Journal A - Hadrons and Nuclei》2002,15(1-2):205-208
In-beam conversion electron spectroscopy experiments have been performed on the transfermium nuclei 253, 254No using the conversion electron spectrometer SACRED in nearly collinear geometry in conjunction with the gas-filled separator
RITU at the University of Jyv?skyl?. The experimental setup is discussed and the spectra are compared to Monte Carlo simulations.
The implications for the ground-state configuration of 253No are discussed.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: rdh@ns.ph.liv.ac.uk
RID="b"
ID="b"Present address: GANIL, F-14021 Caen, France.
RID="c"
ID="c"Permanent address: IReS Strasbourg, IN2P3-CNRS, F-67037-Strasbourg, France.
RID="d"
ID="d"Present address: CEA/DIF DCRE/SDE/LDN F-91680 Bruyeres-le-Chatel.
RID="e"
ID="e"Present address: Daresbury Laboratory, Daresbury WA4 4AD, UK.
RID="f"
ID="f"Permanent address: IPN Lyon, IN2P3-CNRS, F-69037 Lyon, France. 相似文献
7.
S. Yu. Torilov K. A. Gridnev V. I. Zherebchevsky M. Brenner L. I. Vinogradov V. Z. Goldberg T. V. Korovitskaya T. Lönnroth N. A. Maltsev M. Mutterer B. G. Novatskii M. Norrby J. M. K. Slotte Yu. G. Sobolev W. H. Trzaska G. P. Tyurin S. V. Khlebnikov 《JETP Letters》2011,94(1):6-10
High-spin states of the 22Ne nucleus in the excitation energy range of 15–30 MeV have been studied. The angular correlation method has been used to determine the spins of excited states. A number of new states with high angular momenta—20.0 MeV (9?), 20.7 MeV (11?), 21.6 MeV (9?), 22.2 MeV (12+), and 25.0 MeV (9?)—have been revealed. They are intensely populated in the reaction 14C(12C, α1)22Ne* → α2 + 18O and correspond to the rotational bands of various structures. 相似文献
8.
F. Gönnenwein P. Jesinger M. Mutterer W. H. Trzaska G. A. Petrov A. M. Gagarski V. Nesvizhevsky P. Geltenbort 《Acta Physica Hungarica A》2003,18(2-4):419-425
Quaternary fission is a nuclear reaction where the two customary fragments from fission are accompanied by two light charged particles. The process has been investigated at the ILL, Grenoble, for thermal neutron induced fission of 233U and 235U. The light particles were identified to be α particles and H isotopes (mostly tritons). Two different types of processes could be disentangled: in one of these processes all four charged particles are born in coincidence while the second process is in fact merely a special case of ternary fission where the ternary particle decays into two charged particles before reaching the detectors. 相似文献
9.
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
10.
P. Jesinger A. Kötzle F. Gönnenwein M. Mutterer J. von Kalben G. V. Danilyan V. S. Pavlov G. A. Petrov A. M. Gagarski W. H. Trzaska S. M. Soloviev V. V. Nesvizhevski O. Zimmer 《Physics of Atomic Nuclei》2002,65(4):630-636
Ternary fission induced by cold polarized neutrons was studied for the two isotopes 233U and 235U at the Institut Laue-Langevin in Grenoble, France. In particular two types of angular correlations between the spin of the incoming neutrons and the emission directions of both, the fission fragments (FF) and the ternary particles (TP), were investigated. For FF and TP detectors facing the target at right angles to the neutron beam, first, for longitudinally polarized neutrons a triple correlation between spin and the emission of outgoing particles was explored and, second, for transversally polarized neutrons parity violating asymmetries in the emission of FFs and TPs were analyzed. Nonzero expectation values for the triple correlation were oberserved in the present experiments for the first time. 相似文献