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1

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Radiationless transition probabilities in muonic208Pb,232Th, and238U (1991)

Rösel, Ch. ; David, P. ; Folger, H. ; [et al.]

Springer

The European physical journal 340 (1991), S. 199-208

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ISSN: 1434-601X

Keywords: 13.10. + q ; 23.20.-g ; 36.10.-k ; 36.10.Dr

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The probabilities for non-radiative (n.r.) excitationsP n.r. in the muonic nuclides208Pb,232Th, and238U have been determined from (μ−,γγ)-measurements by comparing the intensities of muonic X-ray transitions in single and coincidence spectra. The value ofP n.r. (3p→1s), measured for the first time, is about 90% for the actinides232Th and238U, but only about 8% for208Pb. The value ofP n.r. (3d→1s) is found to be 10 % for233Th, 13% for238U, and about 4% for208Pb. For208Pb a vanishing strength of the n.r. decay of the 2p-level is found, while for232Th and for238U n.r. strengths of about 20% and 26%, respectively, are observed. By regarding two subcomplexes of the 2p→1s transitions leading to different mean excitation energies the n.r. transition probabilities were found to be different for238U only, 21.6% and 31.1.%, respectively.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01303833

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2

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Radiationless transition probabilities in muonic209Bi (1992)

Paganetti, H. ; David, P. ; Hänscheid, H. ; [et al.]

Springer

The European physical journal 342 (1992), S. 245-246

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ISSN: 1434-601X

Keywords: 13.10.+q ; 23.20.−g ; 36.10.−k ; 36.10.Dr

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The probability for non-radiative (n.r.) excitations in muonic209Bi was determined from a (μ −,γγ)-measurement by comparing the intensities of muonic X-ray transitions in single and coincidence spectra. The values of Pn.r(3p→1s)=(17.9±2.0)% and Pn.r.(3d→1s)=(3.0±2.2)% were measured for the first time. The strength of the n.r. decay of the 2p-level was found to be (4.2±2.2)%. The n.r. transition probabilities of two subcomplexes of the (2p→1s)-transition leading to different mean excitation energies are (3.2±1.8)% and (5.0±2.0)%, respectively.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01288477

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3

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

Rösel, Ch. ; Hänscheid, H. ; Hartfiel, J. ; [et al.]

Springer

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

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ISSN: 1434-601X

Keywords: 13.10.+q ; 14.60.Ef ; 25.85.Ge ; 27.90.+b ; 36.10.Dr

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: 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.

Type of Medium: Electronic Resource

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

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4

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Muon attachment in prompt fission of237Np (1991)

Risse, F. ; Bertl, W. ; David, P. ; [et al.]

Springer

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

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ISSN: 1434-601X

Keywords: 13.10.+9 ; 14.60.Ef ; 25.30.−C ; 25.85.−W ; 27.90.+b ; 36.10

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: 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.

Type of Medium: Electronic Resource

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

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5

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Nuclear excitation and prompt fission in muonic238U (1992)

Hänscheid, H. ; David, P. ; Folger, H. ; [et al.]

Springer

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

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ISSN: 1434-601X

Keywords: 13.10.+q ; 14.60.Ef ; 23.20.−g ; 25.30.−c ; 25.85.−w ; 27.90.+b ; 36.10.−k

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: 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.

Type of Medium: Electronic Resource

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

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6

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

Rösel, C. ; Karpeshin, F. F. ; David, P. ; [et al.]

Springer

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

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ISSN: 1434-601X

Keywords: 23.20.−g ; 25.85.−W ; 36.10.−k ; 36.10.Dr

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: 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.

Type of Medium: Electronic Resource

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

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7

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Muon capture rates in233U,234U,235U,236U,238U, and237Np (1990)

Hänscheid, H. ; David, P. ; Konijn, J. ; [et al.]

Springer

The European physical journal 335 (1990), S. 1-8

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ISSN: 1434-601X

Keywords: 13.10. + q ; 13.35. + s ; 14.60.Ef ; 25.85.-w ; 27.90. + b ; 36.10.Dr

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The time spectra for muon induced fission of233U,234U,235U,236U,238U, and237Np were measured simultaneously, detecting both fragments in coincidence in a fast multi parallel plate avalanche detector. The observed mean lifetimes τ are 68.9 ± 0.3 ns, 70.6 ± 0.2 ns, 72.2 ±0.2 ns, 74.3 ± 0.3 ns, 77.0 ±0.4 ns, and 69.8 ±0.2 ns for the above isotopes, respectively. No second time component, tentatively ascribed to a possible fission isomer, was observed. The deduced total capture rates are compared with theoretical predictions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01289340

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