Few-neutron removal from238U at relativistic energies

Aumann, T.; Sümmerer, K.; Geißel, H.; Blank, Β.; Brohm, T.; Clerc, H.‐G.; Czájkowski, S.; Donzaud, C.; Grewe, A.; Hanelt, E.; Heinz, A.; Irnich, H.; Jong, M. de; Junghans, A. R.; Kratz, J. V.; Magel, A.; Münzenberg, G.; Nickel, F.; Pfützner, M.; Piechaczek, A.; Röhl, C.; Scheidenberger, C.; Schmidt, Karl‐Heinz; Schwab, W.; Steinhäuser, S.; Trinder, W.; Voss, B.

doi:10.1007/bf01298903

Cited by 25 publications

(11 citation statements)

References 31 publications

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“…Therefore, our data give evidence for the excitation of the double giantdipole resonance in uranium. This result is in good agreement with recently reported neutron removal cross sections of 238U [14]. In that publication it was shown that the cross sections for ln-4n removal are well reproduced by similar WW calculations which use the same parametrization of the fission probability.…”

Section: O-tota I ----~R E M F "4-~tn Uclea Vsupporting

confidence: 89%

“…While the 1-phonon excitations were well reproduced by the calculations, the cross sections of the 2-phonon excitations were underpredicted [12,13]. In a recent experiment in to 4n removal cross sections of 23SU-projectiles impinging on A1, Cu and Pb targets were measured [14]. The results were well reproduced by WW-calculations including the excitation of the double GDR.…”

Section: Introductionmentioning

confidence: 87%

“…In order to understand the experimental results we investigated folding calculations including the excitation energy distribution of the WW-theory and the fission probability, parametrizations of experimental peak-to-valley ratios [47][48][49] and the proton odd-even-effect [50] as a function of the excitation energy. For energies below ~15 MeV experimental fission probabilities were used [34], for higher excitation energies the results of a calculation [14]. The WW calculations were performed using the harmonic oscillator ansatz with ordinary strength for the excitation of the double GDR as described before.…”

Section: O-tota I ----~R E M F "4-~tn Uclea Vmentioning

confidence: 99%

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Electromagnetic fission of238U at 600 and 1000 MeV per nucleon

Rubehn

Müller

Bassini³

et al. 1995

Z. Physik A - Hadrons and Nuclei

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Abstract. Electromagnetic fission of 23Su projectiles at E/A = 600 and 1000 MeV was studied with the ALADIN spectrometer at the heavy-ion synchrotron SIS. Seven different targets (Be, C, A1, Cu, In, Au and U) were used. By considering only those fission events where the two charges added up to 92, most of the nuclear interactions were excluded. The nuclear contributions to the measured fission cross sections were determined by extrapolating from beryllium to the heavier targets with the concept of factorization. The obtained cross sections for electromagnetic fission are well reproduced by extended Weizs~icker-Williams calculations which include E1 and E2 excitations. The asymmetry of the fission fragments' charge distribution gives evidence for the excitation of the double giant-dipole resonance in uranium.

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Section: O-tota I ----~R E M F "4-~tn Uclea Vsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 87%

Section: O-tota I ----~R E M F "4-~tn Uclea Vmentioning

confidence: 99%

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Electromagnetic fission of238U at 600 and 1000 MeV per nucleon

Rubehn

Müller

Bassini³

et al. 1995

Z. Physik A - Hadrons and Nuclei

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“…As argument for this new point of view, let us recall that another decay mode of the DGDR has already been discovered; it is the 3n-decay of the DGDR, recently observed in hevy-ion reactions at relativistic energies [13].…”

Section: -The A-decay Of the Dgdr Of A Fissioning Nucleusmentioning

confidence: 98%

On the alpha- and cluster-decays of the double giant dipole resonance of fissioning nuclei

Mouze

Ricci

1997

Nuov Cim A

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Summary. -Alpha-and light charged particle-accompanied fissions can be understood as decay modes of a double giant dipole resonance (DGDR). We show that the extra energy needed by a fissioning nucleus for emitting an a-particle is equal to the energy of the DGDR. An attempt is made to interpret observations of -IntroductionThe phenomenon of a-particle accompanied fission, discovered in 1946, is still unexplained. Still unexplained too is the phenomenon of cluster-accompanied fission, also called "light charged particle (LCP)-accompanied fission".The aim of this paper is to show how it is possible to evaluate the energy that has to be found by a fissioning nucleus for emitting a ternary particle, in particular an a-particle, or a heavier cluster, and further, to show that this energy is about the same as the energy of the double giant dipole resonance (DGDR) of the fissioning nucleus (sect. 2). This stimulated emission of an a-particle or of a heavier cluster, has to be considered as a new decay mode of the DGDR, which can be compared with the recently discovered 3n-decay of the DGDR. Thus, each fissioning nucleus has a double giant dipole resonance, and the origin of this DGDR has to be found in energy-rich processes, such as "ionization" processes or rearrangement reactions (sect. 3). It can be shown that the observed kinetic-energy distribution of the a-accompanied fission of

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“…Experimentally, measurements have investigated various decay branches, like γ-rays, neutron emission, and fission, see, e.g., Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Almost exclusively, all the experimental data have been compared with calculations using the semi-classical Weizsäcker-Williams method of virtual photons [21][22][23][24] which has been shown to give an appropriate description of the process [24].…”

mentioning

confidence: 99%

Probing the quantum-mechanical equivalent-photon spectrum for electromagnetic dissociation of relativistic uranium projectiles

Rubehn

Mueller²,

Trautmann³

1997

Phys. Rev. C

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Electromagnetic fission cross sections for the reactions U ϩ ͑Be, C, Al, Cu, In, Au, U͒ at E/A ϭ 0.6 and 1.0 GeV are compared to theoretical calculations using recently proposed quantum-mechanical equivalent-photon spectra. In contrast to semiclassical calculations, systematically lower cross sections are obtained that cannot reproduce the experimental results. Since electromagnetic fission cross sections are virtually independent of the excitation of the double giant dipole resonance ͑DGDR͒, this conclusion is not influenced by the strength of the DGDR.

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Few-neutron removal from238U at relativistic energies

Cited by 25 publications

References 31 publications

Electromagnetic fission of238U at 600 and 1000 MeV per nucleon

Electromagnetic fission of238U at 600 and 1000 MeV per nucleon

On the alpha- and cluster-decays of the double giant dipole resonance of fissioning nuclei

Probing the quantum-mechanical equivalent-photon spectrum for electromagnetic dissociation of relativistic uranium projectiles

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