(p, α) Reactions on 9Be and 10B for Ep = 18–45 MeV

Hauser, H. J.; Walz, Marie‐Madeleine; Weng, Fei; Staudt, G.; Rath, P. K.

doi:10.1016/0375-9474(86)90392-1

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…While the resonant cross section (or S-factor) of 10 B(p,α 0 ) 7 Be can be reproduced well by the DWBA alone, an interfering resonance in At high energies the transition to the ground state of 7 Be (Q = 1.15 MeV [33], binding energy E bind = 18.67 MeV [34] of the triton in the 10 B nucleus) was previously analyzed by means of the DWBA method [35]. For the transition to the first excited state at sub-Coulomb energies, there has only been a simplified DWBA calculation of the direct reaction contribution to the cross section which considered only the Coulomb potential [36].…”

Section: Methodsmentioning

confidence: 99%

“…The effective NN interaction V for the folding procedure was of the DDM3Y type [31] and the density distributions were taken from Ref. [32] [34] of the triton in the 10 B nucleus) was previously analyzed by means of the DWBA method [35]. For the transition to the first excited state at subCoulomb energies, there has only been a simplified DWBA calculation of the direct reaction contribution to the cross section which considered only the Coulomb potential [36].…”

Section: Methodsmentioning

confidence: 99%

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Astrophysical reaction rates forB10(p,α)7
Rauscher
¹
,
Raimann
²

1996
Phys. Rev. C
32
1
25
0
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The reactions 10 B(p,α) 7 Be and 11 B(p,α) 8 Be are studied at thermonuclear energies using DWBA calculations. For both reactions, transitions to the ground states and first excited states are investigated. In the case of 10 B(p,α) 7 Be, a resonance at E Res = 10 keV can be consistently described in the potential model, thereby allowing the extension of the astrophysical S-factor data to very low energies. Strong interference with a resonance at about E Res = 550 keV require a Breit-Wigner description of that resonance and the introduction of an interference term for the reaction 10 B(p,α 1 ) 7 Be * . Two isospin T = 1 resonances (at E Res1 = 149 keV and E Res2 = 619 keV) observed in the 11 B+p reactions necessitate Breit-Wigner resonance and interference terms to fit the data of the 11 B(p,α) 8 Be reaction. S-factors and thermonuclear reaction rates are given for each reaction. The present calculation is the first consistent parametrization for the transition to the ground states and first excited states * current address 1 at low energies.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Astrophysical reaction rates forB10(p,α)7
Rauscher
¹
,
Raimann
²

1996
Phys. Rev. C
32
1
25
0
View full text Add to dashboard Cite

show abstract

“…The information on the excited states in 11 C is still limited. Resonance states above E ex = 9 MeV have been studied via 10 B(p, α) and other reactions such as 12 C(p, d) 11 C [8][9][10][11][12][13][14][15][16][17]. The resonances typically have widths of the order of 100 keV, but their α-decay widths Γ α are not known with a good precision, and even the spin and parity (J π ) have not been clearly determined yet for some of the states.…”

mentioning

confidence: 99%

Alpha-resonance structure in $^{11}$C studied via resonant scattering of $^{7}$Be+$α$ and $^{7}$Be($α$, $p$) reaction

Yamaguchi,

Kahl,

Wakabayashi

et al. 2012

Preprint

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Background: The resonance structure in 11 C is particularly of interest with regard to the astrophysical 7 Be(α, γ) reaction, relevant at high temperature, and to the α-cluster structure in 11 C. Purpose:The measurement was to determine unknown resonance parameters for the high excited states of 11 C. In particular, the α decay width can be useful information to discuss α cluster structure in 11 C.Methods: New measurements of the 7 Be+α resonant scattering and the 7 Be(α, p) 10 B reaction in inverse kinematics were performed for center-of-mass energy up to 5.5 MeV, and the resonances at excitation energies of 8.9-12.7 MeV in the compound 11 C nucleus were studied. Inelastic scattering of 7 Be+α and the 7 Be(α, p1) 10 B * reaction were also studied with a simultaneous γ-ray measurement. The measurements were performed at the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) of the Center for Nuclear Study (CNS), the University of Tokyo.Results: We obtained excitation functions of 7 Be(α, α0) 7 Be (elastic scattering), 7 Be(α, α1) 7 Be * (inelastic scattering), 7 Be(α, p0) 10 B, and 7 Be(α, p1) 10 B * . Many resonances including a new one were observed and their parameters were determined by an R-matrix analysis.Conclusions: The resonances we observed possibly enhance the 7 Be(α, γ) reaction rate but in a smaller magnitude than the lower-lying resonances. A new negative-parity cluster band, similar to the one previously suggested in the mirror nucleus 11 B, is proposed.

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“…Resonance states above E ex = 9 MeV have been studied via 10 B(p, α) and other reactions such as 12 C(p, d) 11 C [8][9][10][11][12][13][14][15][16][17]. The resonances typically have widths of the order of 100 keV, but their α-decay widths Γ α are not known with a good precision, and even the spin and parity (J π ) have not been clearly determined yet for some of the states.…”

mentioning

confidence: 99%

α-resonance structure in11C studied via resonant scattering of7Be+α

et al. 2013

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Background: The resonance structure in 11 C is particularly of interest with regard to the astrophysical 7 Be(α, γ) reaction, relevant at high temperature, and to the α-cluster structure in 11 C.Purpose: The measurement was to determine unknown resonance parameters for the high excited states of 11 C. In particular, the α decay width can be useful information to discuss α cluster structure in 11 C.Methods: New measurements of the 7 Be+α resonant scattering and the 7 Be(α, p) 10 B reaction in inverse kinematics were performed for center-of-mass energy up to 5.5 MeV, and the resonances at excitation energies of 8.9-12.7 MeV in the compound 11 C nucleus were studied. Inelastic scattering of 7 Be+α and the 7 Be(α, p1) 10 B * reaction were also studied with a simultaneous γ-ray measurement. The measurements were performed at the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) of the Center for Nuclear Study (CNS), the University of Tokyo. Results:We obtained excitation functions of 7 Be(α, α0) 7 Be (elastic scattering), 7 Be(α, α1) 7 Be * (inelastic scattering), 7 Be(α, p0) 10 B, and 7 Be(α, p1) 10 B * . Many resonances including a new one were observed and their parameters were determined by an R-matrix analysis. Conclusions:The resonances we observed possibly enhance the 7 Be(α, γ) reaction rate but in a smaller magnitude than the lower-lying resonances. A new negative-parity cluster band, similar to the one previously suggested in the mirror nucleus 11 B, is proposed.

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(p, α) Reactions on 9Be and 10B for Ep = 18–45 MeV

Cited by 11 publications

References 22 publications

Astrophysical reaction rates forB10(p,α)7
Rauscher
¹
,
Raimann
²

1996
Phys. Rev. C
32
1
25
0
View full text Add to dashboard Cite

Astrophysical reaction rates forB10(p,α)7
Rauscher
¹
,
Raimann
²

1996
Phys. Rev. C
32
1
25
0
View full text Add to dashboard Cite

Alpha-resonance structure in $^{11}$C studied via resonant scattering of $^{7}$Be+$α$ and $^{7}$Be($α$, $p$) reaction

α-resonance structure in11C studied via resonant scattering of7Be+α

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(p, α) Reactions on 9Be and 10B for Ep = 18–45 MeV

Cited by 11 publications

References 22 publications

Astrophysical reaction rates forB10(p,α)7Rauscher1, Raimann2 1996Phys. Rev. C321250View full textAdd to dashboardCite

Astrophysical reaction rates forB10(p,α)7Rauscher1, Raimann2 1996Phys. Rev. C321250View full textAdd to dashboardCite

Alpha-resonance structure in $^{11}$C studied via resonant scattering of $^{7}$Be+$α$ and $^{7}$Be($α$, $p$) reaction

α-resonance structure in11C studied via resonant scattering of7Be+α

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Resources

About

Astrophysical reaction rates forB10(p,α)7
Rauscher
¹
,
Raimann
²

1996
Phys. Rev. C
32
1
25
0
View full text Add to dashboard Cite

Astrophysical reaction rates forB10(p,α)7
Rauscher
¹
,
Raimann
²

1996
Phys. Rev. C
32
1
25
0
View full text Add to dashboard Cite