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Digitale Medien

Intrastate γ-transitions: A spectroscopic tool? (1987)

Krolle, D. ; Langanke, K. ; Rolfs, C.

Springer

The European physical journal 328 (1987), S. 291-299

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ISSN: 1434-601X

Schlagwort(e): 23.20 ; 21.10.-k

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract In the framework of a potential model we have calculated the various bremsstrahlung cross sections into the5Li ground state, includingM 1 andE 2 γ-transitions leading from the high energy wing of the5Li ground state resonance into states belonging to the same resonance at lower energy (intrastate transition). Our calculation supports the hypothesis of Schmalbrock et al. [1] that intrastate transitions ofM 1 andE 2 multipolarity exist. While we find a maximum cross section of roughly 1.4 nb for theE 2 transition, we predict the cross sections forM 1 intrastate transition to be less than 3·10−5nb. An experimental observation of the intrastate γ-ray emission appears to be very difficult due to the dominance of competing resonant (M 1) and direct (E 1) capture processes. Schmalbrock et al. have suggested to deduce magnetic dipole and electric quadrupole moments of resonant states from the measurements of the respectiveM 1 andE 2 intrastate transitions. We will show that theM 1 intrastate cross sections do not yield the appropriate information to determine the magnetic dipole moment. We will also discuss thatE 2 intrastate transitions do not seem to be a suited tool to find the quadrupole moment of an unstable state.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01290497

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Digitale Medien

Influence of theD and6Li quadrupole moments on theD(α,γ)6Li stellar reaction rate (1986)

Langanke, K. ; Rolfs, C.

Springer

The European physical journal 325 (1986), S. 193-196

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ISSN: 1434-601X

Schlagwort(e): 23.20 ; 27.10

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We have studied theD(α, γ)6Li reaction at stellar energies within a potential model. Our calculation improves previous investigations as we explicitely take into account the internal quadrupole moment of the deuteron and ad-state component in the6Li ground state. We reproduce the experimental data for energiesE〈3 MeV. We find, however, that our improvements represent only minor corrections.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01289650

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Resonant and intrastate transitions to the 2+ state in8Be (1986)

Langanke, K. ; Rolfs, C.

Springer

The European physical journal 324 (1986), S. 307-310

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ISSN: 1434-601X

Schlagwort(e): 23.20 ; 27.10 ; 21.60G

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract We have studied resonant, intrastate and non-resonant bremsstrahlungγ-ray transitions leading to the 2+ state in8Be atE x=2.94 MeV. We find aγ-width of Γ γ =0.45 eV for the 4+ state in8Be, corresponding to anE 2 strength of 19 W.u. For the intrastateγ-ray transition within the 2+ resonance we predict a maximum cross section of 2.5 nb atE≈3.3 MeV. An experimental observation of this novel type ofγ-ray emission, however, appears to be difficult due to the dominance of competing resonant and direct capture processes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01294584

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