Fission of heavy nuclei induced by stopped antiprotons. I. Inclusive characteristics of fission fragments

Hofmann, Peter; Iljinov, A. S.; Kim, Y. S.; Mebel, M. V.; Daniel, H.; David, Peter; Egidy, T. von; Haninger, T.; Hartmann, F. J.; Jastrzȩbski, J.; Kurcewicz, W.; Lieb, J.; Machner, H.; Plendl, H. S.; Riepe, G.; Wright, Byron T.; Ziock, K.O.H.

doi:10.1103/physrevc.49.2555

Cited by 30 publications

(18 citation statements)

References 11 publications

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“…2 of Ref. [67]). A similar behavior was also observed in the binary decay of a 244 Cm compound nucleus [68] produced in the heavy-ion fusion reaction of 8.4 A MeV 232 Th on 12 C (see Fig.…”

Section: B Mass and Charge Distributionsmentioning

confidence: 88%

Light nuclides produced in the proton-induced spallation ofU238at 1 GeV

et al. 2006

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The production of light and intermediate-mass nuclides formed in the reaction 1 H + 238 U at 1 GeV was measured at the Fragment Separator at GSI, Darmstadt. The experiment was performed in inverse kinematics, by shooting a 1 A GeV 238 U beam on a thin liquid-hydrogen target. A total of 254 isotopes of all elements in the range 7 Z 37 were unambiguously identified, and the velocity distributions of the produced nuclides were determined with high precision. The results show that the nuclides are produced in a very asymmetric binary decay of heavy nuclei originating from the spallation of uranium. All the features of the produced nuclides merge with the characteristics of the fission products as their mass increases.

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“…2 of Ref. [67]). A similar behavior was also observed in the binary decay of a 244 Cm compound nucleus [68] produced in the heavy-ion fusion reaction of 8.4 A MeV 232 Th on 12 C (see Fig.…”

Section: B Mass and Charge Distributionsmentioning

confidence: 88%

Light nuclides produced in the proton-induced spallation ofU238at 1 GeV

et al. 2006

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“…a very peripheral nuclear collision with relativistic heavy ions, introducing small shape distortions [17] and low angular momenta [18]. Moreover, compared to previous quite interesting attempts to reach this goal by relativistic proton-nucleus collisions in inverse kinematics [19] and the annihilation of antiprotons [20,21] at the nuclear surface, this approach populates higher excitation energies more strongly, up to the onset of multifragmentation [8]. Such high excitation energies are crucial for the manifestation of transient effects, as we will show.…”

Section: Experimental Approachmentioning

confidence: 99%

Conditions for the manifestation of transient effects in fission

et al. 2005

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Abstract:We examine the manifestation of transient effects in fission by analysing experimental data where fission is induced by peripheral heavy-ion collisions at relativistic energies. Available total nuclear fission cross sections of 238 U at 1⋅A GeV on gold and uranium targets are compared with a nuclear-reaction code, where transient effects in fission are modelled using different approximations to the numerical time-dependent fission-decay width: a new analytical description based on the solution of the Fokker-Planck equation and two widely used but less realistic descriptions, a step function and an exponential-like function. The experimental data are only reproduced when transient effects are considered. The deduced value of the dissipation strength β depends strongly on the approximation applied for the time-dependent fission-decay width and is estimated to be of the order of 2·10 21 s -1. A careful analysis sheds severe doubts on the use of the exponential-like in-growth function largely used in the past. Finally, we discuss which should be the characteristics of experimental observables to be most sensitive to transient effects in fission.

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“…The measured fission fragments are nevertheless clearly separated in energy loss from background and light charged particles. fluctuation due to preequilibrium emission of fast particles from a highly excited nucleus [11]. Such a control is very useful to check the beam position on the target in different runs in order to decrease the systematic errors.…”

Section: Experimental Technique and Resultsmentioning

confidence: 99%

Fission probabilities of Cu, Nb, Ag, Ho, Au and Bi nuclei excited by stopped antiprotons

Ivanov

Iljinov

Mebel

et al. 1995

Z. Physik A - Hadrons and Nuclei

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Abstract. The A dependence of nuclear fission induced by stopped antiprotons has been measured. An unambiguous identification of the binary fission decay mode was provided by a coordinate measurement of complementary fission fragments in coincidence using a large-acceptance fission detector based on low pressure multiwire proportional chambers. A deep fissility minimum was observed near A = 100, in agreement with the general behaviour predicted by the liquid-drop model. An unexpectedly low and high fission probability was found for the Ag and Cu nuclei, respectively.

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Fission of heavy nuclei induced by stopped antiprotons. I. Inclusive characteristics of fission fragments

Cited by 30 publications

References 11 publications

Light nuclides produced in the proton-induced spallation ofU238at 1 GeV

Light nuclides produced in the proton-induced spallation ofU238at 1 GeV

Conditions for the manifestation of transient effects in fission

Fission probabilities of Cu, Nb, Ag, Ho, Au and Bi nuclei excited by stopped antiprotons

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