Cross Sections for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Be</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>7</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow><mml:mo>(</mml:mo><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo>)</mml:mo><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mprescripts /><m

Vaughn, F.J.; Chalmers, R. A.; Kohler, D.; Chase, L. F.

doi:10.1103/physrevc.2.1657

Cited by 97 publications

(147 citation statements)

References 16 publications

Supporting

Mentioning

126

Contrasting

Order By: Relevance

“…Very recently, the latter has been redetermined by new high-precision direct measurements [4,5,6,7] and extrapolated to zero energy with the help of a theoretical model [8]. The resulting zero-energy astrophysical S factors, S 17 (0), however, do not always agree within their quoted errors: Hammache et al [4] found S 17 (0) = 18.8 ± 1.7 eV b, in agreement with other direct-capture data [5,9,10]. In contrast, Junghans et al [6] report a considerably larger value, S 17 (0) = 22.3 ± 0.7 ± 0.5 eV b.…”

supporting

confidence: 60%

See 1 more Smart Citation

Coulomb Dissociation ofB8and the Low-Energy Cross Section of theBe7
Schümann¹,
Hammache²,
Typel³
et al. 2003
Phys. Rev. Lett.
87
3
42
0
View full text Add to dashboard Cite

An exclusive measurement of the Coulomb breakup of 8 B into 7 Be+p at 254 A MeV allowed to study the angular correlations of the breakup particles. These correlations demonstrate clearly that E1 multipolarity dominates and that E2 multipolarity can be neglected. By using a simple single-particle model for 8 B and treating the breakup in first-order perturbation theory, we extract a zero-energy S factor of S17(0) = 18.6 ± 1.2 ± 1.0 eV b, where the first error is experimental and the second one reflects the theoretical uncertainty in the extrapolation.

show abstract

supporting

confidence: 60%

“…The opposite behaviour is noted above the M1 resonance: our data and those of Refs. [6,7] match excellently, whereas the other (p,γ) experiments [4,5,9,10] consistently report lower values. We want to emphasize the remarkably good agreement of our CD data up to 1.1 MeV with the most recent direct-proton-capture experiment where an ion- Ref.…”

mentioning

confidence: 50%

Coulomb Dissociation ofB8and the Low-Energy Cross Section of theBe7
Schümann¹,
Hammache²,
Typel³
et al. 2003
Phys. Rev. Lett.
87
3
42
0
View full text Add to dashboard Cite

show abstract

“…At first the RIKEN1 [ 7] and RIKEN2 [ 8] data addressed the (historical) disagreement between data measured by Filippone and Vaughn [ 9,10] and that of Kavanagh and Parker [ 11,12]. The RIKEN1 data were available seven years before any modern day measurement of the direct reaction.…”

Section: Coulomb Dissociationmentioning

confidence: 99%

The Coulomb Dissociation of 8 B and a Critical Assessment of the Seattle 17 (0) Result

Gai¹

2005

Acta Physica Hungarica A) Heavy Ion Physics

View full text Add to dashboard Cite

Abstract. The Coulomb dissociation of 8 B, measured with high precision by the GSI group, is in excellent agreement with the astrophysical cross section factor (S 17 ) measured by the Weizmann group with a 7 Be target. The GSI and Weizmann data are in good agreement with the Seattle data at high energies, but at low energies we observe a slight systematic (up to 2σ) deviation, yet the Seattle group repeatedly rejects the CD method. We show that when plotting the slopes, they mis plotted one CD data point and exclude measured slopes that contradict their claim. Indeed the measured slope is essential to elucidate the d-wave correction to S 17 (0) that could be as large as 15%, and is the last open question that needs to be resolved before S 17 (0) can be quoted with an accuracy of 5% or better. We show that this goal has not been achieved (in spite of the strong claim of the Seattle group), since currently there is no agreement among experiments as well as among theoretical models on the value of the slope. In addition, currently there is no theoretical framework within which (for example the Seattle) data can be analyzed and S 17 (0) extrapolated with the claimed high precision of 2.5%. This (last) issue of the slope and the d-wave correction must be resolved (by future measurements) so as to allow quoting S 17 (0) with an accuracy of 5% or better.

show abstract

“…The resulting astrophysical S factors, which were obtained this way, are summarized in Table II. They include: S 17 (0): Extrapolations of the cross sections measured by Vaughn (1970) and by Filippone(1983), using either simple potential models or the very general properties of subCoulomb cross section, gave S 17 (0) ≈ 17 eV · b (Barker and Spear 1986; Dar and Shaviv 1994; Kim et al 1994). Similar values were obtained also by different types of experiments:…”

Section: Nuclear Reaction Ratesmentioning

confidence: 99%

“…(1) uncertainties in the measured cross sections at laboratory energies, (2) The "average cross section" which they extrapolated to solar energies was obtained by averaging cross sections which differ by many standard deviations and have different energy shapes (the cross sections measured by Kavanagh (1960) and by Parker (1968) differ by more than 3σ from the cross sections measured later by Vaughn (1970) and by Filippone (1983) Dar and Shaviv (1994) noted that sub-Coulomb radiative captures and transfer reactions take place mainly when the colliding nuclei are far apart. They argued that since optical models describe well the shapes of the bound state and relative motion wave functions outside the nuclear potential, they should be preferred for extrapolating the laboratory cross sections to solar energies.…”

Section: Nuclear Reaction Ratesmentioning

confidence: 99%

Standard solar neutrinos

Dar

1998

Surveys in High Energy Physics

View full text Add to dashboard Cite

The predictions of an improved standard solar model are compared with the observations of the four solar neutrino experiments. The improved model includes premain sequence evolution, element diffusion, partial ionization effects, and all the possible nuclear reactions between the main elements. It uses updated values for the initial solar element abundances, the solar age, the solar luminosity, the nuclear reaction rates and the radiative opacities. Neither nuclear equilibrium, nor complete ionization are assumed. The calculated 8 B solar neutrino flux is consistent, within the theoretical and experimental uncertainties, with the solar neutrino flux measured by Kamiokande. The results from the 37 Cl and 71 Ga radiochemical experiments seem to suggest that the terrestrial 7 Be solar neutrino flux is much smaller than that predicted. However, the present terrestrial "defecit" of 7 Be solar neutrinos may be due to the use of inaccurate theoretical neutrino absorption cross sections near threshold for extracting solar neutrino fluxes from production rates. Conclusive evidence for a real deficit of 7 Be solar neutrinos will require experiments such as BOREXINO or HELLAZ. A real defecit of 7 Be solar neutrinos can be due to either astrophysical reasons or neutrino properties beyond the standard electroweak model. Only future neutrino experiments, such as SNO, Superkamiokande, BOREXINO and HELLAZ, will be able to provide conclusive evidence that the solar neutrino problem is a consequence of neutrino properties beyond the standard electroweak model. Earlier indications may be provided by long baseline neutrino oscillation experiments.

show abstract

Cross Sections for theBe7(p,γ)B

Cited by 97 publications

References 16 publications

Coulomb Dissociation ofB8and the Low-Energy Cross Section of theBe7
Schümann¹,
Hammache²,
Typel³
et al. 2003
Phys. Rev. Lett.
87
3
42
0
View full text Add to dashboard Cite

Coulomb Dissociation ofB8and the Low-Energy Cross Section of theBe7
Schümann¹,
Hammache²,
Typel³
et al. 2003
Phys. Rev. Lett.
87
3
42
0
View full text Add to dashboard Cite

The Coulomb Dissociation of 8 B and a Critical Assessment of the Seattle 17 (0) Result

Standard solar neutrinos

Contact Info

Product

Resources

About

Cross Sections for theBe7(p,γ)B

Cited by 97 publications

References 16 publications

Coulomb Dissociation ofB8and the Low-Energy Cross Section of theBe7Schümann1, Hammache2, Typel3 et al. 2003Phys. Rev. Lett.873420View full textAdd to dashboardCite

Coulomb Dissociation ofB8and the Low-Energy Cross Section of theBe7Schümann1, Hammache2, Typel3 et al. 2003Phys. Rev. Lett.873420View full textAdd to dashboardCite

The Coulomb Dissociation of 8 B and a Critical Assessment of the Seattle 17 (0) Result

Standard solar neutrinos

Contact Info

Product

Resources

About

Coulomb Dissociation ofB8and the Low-Energy Cross Section of theBe7
Schümann¹,
Hammache²,
Typel³
et al. 2003
Phys. Rev. Lett.
87
3
42
0
View full text Add to dashboard Cite

Coulomb Dissociation ofB8and the Low-Energy Cross Section of theBe7
Schümann¹,
Hammache²,
Typel³
et al. 2003
Phys. Rev. Lett.
87
3
42
0
View full text Add to dashboard Cite