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Digitale Medien

The study of prompt and delayed muon induced fission (1993)

Rösel, Ch. ; Hänscheid, H. ; Hartfiel, J. ; [weitere]

Springer

The European physical journal 345 (1993), S. 89-95

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ISSN: 1434-601X

Schlagwort(e): 13.10.+q ; 14.60.Ef ; 25.85.Ge ; 27.90.+b ; 36.10.Dr

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The ratios of prompt to delayed fission yields for the isotopes233U,234U,235U,236U,238U,237Np,242Pu, and244Pu and the fission probabilities relative to each other have been investigated experimentally. Using the value of the total fission probability for237Np the absolute probabilities for prompt and delayed fission have been determined. The fission probabilities per muon captureP fc have been derived for all the isotopes and compared with an evaluation based on excitation functions from theory.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01290344

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Digitale Medien

Muon attachment in prompt fission of237Np (1991)

Risse, F. ; Bertl, W. ; David, P. ; [weitere]

Springer

The European physical journal 339 (1991), S. 427-433

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ISSN: 1434-601X

Schlagwort(e): 13.10.+9 ; 14.60.Ef ; 25.30.−C ; 25.85.−W ; 27.90.+b ; 36.10

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The probabilities of muon attachment to fission fragments in the prompt fission of237Np have been determined as a function of fragment mass and total kinetic energy release in a (μ −,f 1 f 2 e −)-coincidence measurement. A strong dependence of the attachment probability on the fragment mass is observed. The experimental results are compared with theoretical predictions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01288426

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Digitale Medien

Nuclear excitation and prompt fission in muonic238U (1992)

Hänscheid, H. ; David, P. ; Folger, H. ; [weitere]

Springer

The European physical journal 342 (1992), S. 111-120

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ISSN: 1434-601X

Schlagwort(e): 13.10.+q ; 14.60.Ef ; 23.20.−g ; 25.30.−c ; 25.85.−w ; 27.90.+b ; 36.10.−k

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract A study of muonic238U has been performed in a combined (μ −,γ f) and (μ −,γγ) coincidence experiment to investigate the role of non-radiative transitions and their fission probabilities. An augmentation of the outer fission barrier ofΔE b =(0.6±0.1) MeV due to the presence of the muon is deduced. A significant contribution to the prompt fission yield not only results from the (2p→1s) and (3d→1s) non-radiative transitions, but also from other radiationless transitions. Specifically, the measured fission probabilities of the transitions (2p→1s), (3d→1s), and (3p→1s) are (1.5±0.4)%, (5.7±1.7)%, and (5.3±1.9)%, respectively.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01294496

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Digitale Medien

Experimental evidence for muonicX-rays from fission fragments (1993)

Rösel, C. ; Karpeshin, F. F. ; David, P. ; [weitere]

Springer

The European physical journal 345 (1993), S. 425-426

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ISSN: 1434-601X

Schlagwort(e): 23.20.−g ; 25.85.−W ; 36.10.−k ; 36.10.Dr

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract In the spectrum of muonic X-rays of238U measured in coincidence with prompt fission events a structure has been found which is attributed to 2p→1s transitions of the muon attached to heavy fragments. The intensityI s of this structure relative to the strengthI pf observed for prompt fission has been determined to beI s/I pf=(6.0± 2.1) %. Although the experimental significance for the appeareance of this phenomenon is weak, this is the first experimental indication for its occuxence.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01282904

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Digitale Medien

The study of prompt and delayed muon induced fission (1987)

David, P. ; Hartfiel, J. ; Janszen, H. ; [weitere]

Springer

The European physical journal 328 (1987), S. 37-47

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ISSN: 1434-601X

Schlagwort(e): 23.40.Z ; 24.75.t ; 25.85.G ; 25.85.J ; 27.90 ; 36.10

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Mass yield and total kinetic energy release (TKE) distributions of fragments from prompt and delayed muon induced fission, separately, have been measured for the isotopes235U,238U,237Np and242Pu. The distributions from prompt muon induced fission are compared with the corresponding distributions from hadronic reactions and from spontaneous fission (s.f.). The distributions from the delayed muonic fission processes are compared to the distributions for neutron and proton-induced fission. No mass distributions measured in the prompt muonic fission process show any signature, which can be attributed to the presence of the muon. Differences observed between the TKE distributions of prompt muon induced and hadron induced fission can be explained by the screening effect of the negative charge of the muon bound in the orbit of one of the fission fragments. The observed yield of symmetric muon induced fission was found to be defined merely by the value of the excitation energy.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01295181

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Digitale Medien

Delayed muon induced fission of209Bi and the role of meson-exchange currents (1992)

Paganetti, H. ; David, P. ; Hänscheid, H. ; [weitere]

Springer

The European physical journal 343 (1992), S. 113-118

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ISSN: 1434-601X

Schlagwort(e): 23.40.Bw ; 13.10.+q ; 25.85.−w ; 25.30.−c ; 27.80.+w ; 13.60.−r

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract The probability for delayed muon induced fission of209Bi has been determined from a (μ −,f 1 f 2) measurement. The measured fission probability P f =(4.2±0.7)×10−5 is compared with theoretical predictions. The high fission threshold reaction seems well suited for studying the influence of two-body meson-exchange currents in nuclear muon capture.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01291603

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