Cross Section for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Be</mml:mi></mml:mrow><mml:mrow><mml:mn>9</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mi> </mml:mi><mml:mi>α</mml:mi><mml:mo>)</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Reaction

Stelson, P.H.; Campbell, E.C.

doi:10.1103/physrev.106.1252

Cited by 31 publications

(6 citation statements)

References 8 publications

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“…The only reaction which can compete with the photodisintegration is the reaction 6 He(α,n) 9 Be. The cross section for the inverse reaction 9 Be(n,α) 6 He was measured by Stelson and Campbell [28] in the energy range from 0.7 to 4.4 MeV. From this the reaction rate of 6 He(α,n) 9 Be was deduced.…”

Section: Reaction Ratesmentioning

confidence: 99%

Reaction rate for two-neutron capture by4He

Efros

Balogh

Herndl

et al. 1996

Z. Physik A — Hadrons and Nuclei

124

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Recent investigations suggest that the neutrino-heated hot bubble between the nascent neutron star and the overlying stellar mantle of a type-II supernova may be the site of the r-process. In the preceding α-process building up the elements to A ≈ 100, the 4 He(2n,γ) 6 Heand 6 He(α,n) 9 Be-reactions bridging the instability gap at A = 5 and A = 8 could be of relevance. We suggest a mechanism for 4 He(2n,γ) 6 He and calculate the reaction rate within the α+n+n approach. The value obtained is about a factor 1.6 smaller than the one obtained recently in the simpler direct-capture model, but is at least three order of magnitude enhanced compared to the previously adopted value. Our calculation confirms the result of the direct-capture calculation that under representative conditions in the α-process the reaction path proceeding through 6 He is negligible compared to 4 He(αn,γ) 9 Be.

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Section: Reaction Ratesmentioning

confidence: 99%

Reaction rate for two-neutron capture by4He

Efros

Balogh

Herndl

et al. 1996

Z. Physik A — Hadrons and Nuclei

124

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confidence: 99%

Molecular structures inT=1states of10B

et al. 2011

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“…The broad 0 + state has not been suggested in 10 B before and has no known analogs in the spectrum of 10 Be. However, total cross section for the analogous 9 Be(n,α) 6 He reaction shows a very broad asymmetric peak in the corresponding energy interval [24,25] that may be interpreted as manifestation of the broad low spin state in 10 Be. While the broad 0 + state describes the excitation functions at all angles, it is not possible to reliably exclude other interpretations of the observed enhancement in the (p,α) cross section (such as contribution from the direct reaction and/or other broad low spin states).…”

Section: Resultsmentioning

confidence: 96%

Molecular Structures in T=1 states of 10B

Kuchera,

Rogachev,

Goldberg

et al. 2011

Preprint

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Background: Multi-center (molecular) structures can play an important role in light nuclei. The highly deformed rotational band in 10 Be with band head at 6.179 MeV has been observed recently and suggested to have an exotic α:2n:α configuration.Purpose: Search for states with α:pn:α two-center molecular configurations in 10 B that are analogous to the states with α:2n:α structure in 10 Be.Method: The T=1 isobaric analog states in 10 B were studied in the energy range of Ex = 8.7 − 12.1 MeV using the reaction 1 H( 9 Be,α) 6 Li*(T=1, 0 + , 3.56 MeV). An R-matrix analysis was used to extract parameters for the states observed in the (p,α) excitation function.Results: Five T=1 states in 10 B have been identified. The known 2 + and 3 − states at 8.9 MeV have been observed and their partial widths have been measured. The spin-parities and partial widths for three higher lying states were determined.Conclusions: Our data support theoretical predictions that the 2 + state at 8.9 MeV (isobaric analog of the 7.54 MeV state in 10 Be) is a highly clustered state and can be identified as a member of the α:np:α rotational band. The next member of this band, the 4 + state, has not been found. A very broad 0 + state at 11 MeV that corresponds to pure α+ 6 Li(0 + ,T=1) configuration is suggested and it might be related to similar structures found in 12 C, 18 O and 20 Ne.

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Cross Section for theBe9(n, α)He6Reaction

Cited by 31 publications

References 8 publications

Reaction rate for two-neutron capture by4He

Reaction rate for two-neutron capture by4He

Molecular structures inT=1states of10B

Molecular Structures in T=1 states of 10B

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