Nuclear excitation and prompt fission in muonic238U

Hänscheid, Heribert; David, Peter; Folger, H.; Konijn, J.; Laat, C.T.A.M. de; Petitjean, C.; Reist, H.W.; Risse, F.; Rösel, Ch.; Schaller, L.A.; Schellenberg, L.; Schrieder, W.; Simons, L. M.; Taal, A.

doi:10.1007/bf01294496

Cited by 6 publications

(9 citation statements)

References 36 publications

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“…is constant for the whole (2p~ ts)-complex. A 238U (1/--, ~ f)-measurement [22] supports this conclusion.…”

Section: Fission Probability Of the Nr (2p--+ 1 S)-transitionsupporting

confidence: 84%

“…4. The reduction of the fission probability APf due to the presence of the muon can be calculated with a formula given by Kupriyanov et al [23], taking into account an augmentation of the inner and outer barrier of 0.1 and 0.6 MeV, respectively, [19,22]: Gavron et al [21]. Open squares are from Berman et al [24], and open triangles are from this work Fig.…”

Section: Fission Probability Of the Nr (3d-+ls)-transitionmentioning

confidence: 99%

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The probability of prompt and delayed fission of muonic237Np

Schrieder

David

Hänscheid

et al. 1991

Z. Physik A - Hadrons and Nuclei

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Fission fragments from the reaction 237Np(p ,y f) have been measured in coincidence with muonic X-rays. The efficiency of the fission fragment detector is determined from (p , 7f)-data of the same experiment. The total fission probability per p-stop Pt has been measured as well as the fission probabilities Pf of the non-radiative muonic (3d~ ls)-and (2p~ls)-transitions; the latter has been divided into two parts leading to different mean excitation energies E: Pt=(54_+17)%, Pf(3d--*ls)=(41__21)%, Pf(2p--~ls, E= 6.218 MeV) = (61 _+ 19)%, andPf(2p~ls, E = 6.525 MeV) = (57 _+ 18)%. The influence of the muon on the fission barrier is discussed. The fission probability after muon capture is compared with a calculated value using a distribution of nuclear excitation energies following muon capture and the fission probability as measured in a a38U (3He, ~f)-reaction.

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“…is constant for the whole (2p~ ts)-complex. A 238U (1/--, ~ f)-measurement [22] supports this conclusion.…”

Section: Fission Probability Of the Nr (2p--+ 1 S)-transitionsupporting

confidence: 84%

Section: Fission Probability Of the Nr (3d-+ls)-transitionmentioning

confidence: 99%

The probability of prompt and delayed fission of muonic237Np

Schrieder

David

Hänscheid

et al. 1991

Z. Physik A - Hadrons and Nuclei

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“…Recently, the results of a 23SU(p-, 7f) experiment devoted to the study of prompt fission have been published [8]. The experimental set-up consisted of two Germanium diodes with BGO-Compton suppression for the X-ray detection and a multi parallel plate avalanche counter filled with metallic ~3SU foils, which served as an active target.…”

Section: Pacsmentioning

confidence: 99%

“…The prompt fission yield originates predominantly from the n.r. 3d~ls transtion [11,8]. Therefore, it is difficult to interpret the magnitude , because the intensity of the transition 3d--,2p is strongly suppressed in the spectrum coincident with prompt fission.…”

mentioning

confidence: 97%

“…Therefore, it is difficult to interpret the magnitude Is/ Ip(3d--~2p), because the intensity of the transition 3d--,2p is strongly suppressed in the spectrum coincident with prompt fission. Hence, the intensity ratio has been transformed into another one, relative to the prompt fission yield: [8]. The full lines indicate the fit to this spectrum, the background, and a gaussian curve.…”

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confidence: 99%

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Experimental evidence for muonicX-rays from fission fragments

Rösel

Karpeshin

David

et al. 1993

Z. Physik A - Hadrons and Nuclei

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Abstract:In the spectrum of muonic X-rays of 238U measured in coincidence with prompt fission events a structure has been found which is attributed to 2p--*ls transitions of the muon attached to heavy fragments. The intensity Is of this structure relative to the strength Ipi observed for prompt fission has been determined to be I,/Iv. f = (6.0-{-2.1) %. Although the experimental significance for the appeareance of this phenomenon is weak, this is the first experimental indication for its occurence. 36.10.Dr Non-radiatlve (n.r.) transitions in heavy muonlc atoms excite the nucleus which then may decay via prompt fission. Contrary to delayed fission occuring as a result of p-capture by the nucleus, the muon survives the prompt fission process and is attached predominantly to the heavy fission fragment [1] forming an atom with the muon in the ls state. In several theoretical investigations it has been stated that the muon canpopulate also excited states [2][3][4][5][6][7]. The p-populates an excited level of a fission fragment either due to internal conversion of the excitation energy of the fragment to the p- [2,3] or as a consequence of the muon transitions during the fission fragment formation. In the first case the probability depends on the energy and multipole composition of the electromagnetic transition of the fragment. In the latter the population strength turns out to be influenced by the dynamics of the fission process. Theoretical predictions for the population probability of the 2p level of the heavy fragment muonic atom range between 1% [6] up to 10% per prompt fission [3,4]. No X-rays from such levels have been reported so far. PACS:Recently, the results of a 23SU(p-, 7f) experiment devoted to the study of prompt fission have been published [8]. The experimental set-up consisted of two Germanium diodes with BGO-Compton suppression for the X-ray detection and a multi parallel plate avalanche counter filled with metallic ~3SU foils, which served as an active target. The muonlc X-rays from the 23sU target have been recorded in coincidence with fragments of prompt as well as delayed fission. The muonic X-ray spectrum coincident with prompt fission should also Present address: * Heuft-Systemtechnik GmbH, W-5475 Burgbrohl, Germany ~'* Klinik und Poliklinik ffir Nuklearmedizin der Universiffit Wfirzburg, W-8700 Wfirzburg, Germany *** Bayer AG, W-5090 Leverkusen, Germany + Gesetlschaft ffr ProzeBsteuerungs-und Informationssysteme mbH, W-8750 Aschaffenburg, Germany contain the muonic X-rays from fission fragments. The energies of both lines of the 2p--,ls transition complex of the most probable isotope 140v s4 Me are lying at 3.7 and 3.8 MeV, respectively. Due to the charge distribution the 2p--,ls transitions of the muonie heavy fragments should occur within an energy interval of about 700 keV [3]. An additional complexity results from the mass distribution. Furthermore, Doppler broadening smears out the separate lines [4]. Fig. 1 shows the spectrum recorded in coincidence with prompt fission by one of th...

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Nuclear Excitation by Free Muon Capture

Gargiulo

2024

Springer Theses

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Nuclear excitation and prompt fission in muonic238U

Cited by 6 publications

References 36 publications

The probability of prompt and delayed fission of muonic237Np

The probability of prompt and delayed fission of muonic237Np

Experimental evidence for muonicX-rays from fission fragments

Nuclear Excitation by Free Muon Capture

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