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Hoyler, F.; Rohwer, Timm; Staudt, G.; Klapdor, H. V.

doi:10.1103/physrevc.31.17

Cited by 15 publications

(4 citation statements)

References 46 publications

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“…with the usual zero-range normalization constant N = 1/2 aD 2 0 = 5.12 • 10 5 [28]. The spectroscopic factors S ℓj relevant for our calculations were taken from [29].…”

Section: Methodsmentioning

confidence: 99%

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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“…with the usual zero-range normalization constant N = 1/2 aD 2 0 = 5.12 • 10 5 [28]. The spectroscopic factors S ℓj relevant for our calculations were taken from [29].…”

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

“…Angular distributions for strongly-populated levels were analyzed with the zero-range distorted wave Born approximation (DWBA) code DWUCK-IV of Kunz [5] using the triton cluster form factor for the transferred nucleons. Alpha optical and triton cluster parameters were adopted from Hoyler et al [6], who studied the similar-mass reaction 27 Al(p,α) 24 Mg. Small modifications of the triton cluster parameters were required to better fit the angular distributions for known levels. In particular, values were adjusted for the reduced radius and diffuseness of the real potential to better fit the experimental data.…”

mentioning

confidence: 99%

“…The number of nodes in the triton cluster wave function was determined by the "harmonic oscillator energy" conservation rule, for 1s internal motion of the cluster [9]. It is assumed that the triton cluster is bound in a Wood-Saxon potential well with a binding energy equal to its separation energy and that the number of nodes and momentum of this wave function are limited by the Talmi-Moshinsky relation 2N+L=Q =Σq i , where Q is the sum of oscillator quanta for the transferred triton [6,7]. A triton of even external momentum transferred from 28 Si would likely originate from the 1d 5/2 shell of the 2s1d shell, and require a value of Q=6, as each nucleon has an oscillator quantum q=2.…”

mentioning

confidence: 99%

An analysis of 25Al energy levels observed in the 28Si(p, ·)25Al reaction

Pittman¹

2009

Proceedings of 10th Symposium on Nuclei in the Cosmos — PoS(NIC X)

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The level structure of 25 Al has been studied at the ORNL Holifield Radioactive Ion Beam Facility (HRIBF) by measuring the angular and energy distributions of alpha particles from the 28 Si(p,α) 25 Al reaction. Proton beams (~10 nA) at laboratory energies of 40-and 42-MeV were generated by the 25 MV tandem accelerator and bombarded a natural silicon target (50 µg/cm 2). Alpha particles were detected and identified in the Silicon Detector Array (SIDAR) in the "telescope" configuration [1]. Eighteen levels have been observed and spins for several have been constrained through a distorted-wave Born approximation (DWBA) analysis of the angular distributions.

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“…Both models give rather similar results [5,4], but nuclear structure arguments favour the pick-up model. For a long time the calculations gave absolute magnitudes for the cross-section that were far too low [6,7] but detailed analyses [8] have largely removed the discrepancy, although some difficulties still remain [9]. …”

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confidence: 99%

Analysis of (p, α) and (p,3He) cross-sections to continuum states by the Feshbach-Kerman-Koonin multistep direct theory

1997

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Summary. -The cross-sections of several p; and p;3 He reactions at high energies to continuum states are analysed in order to obtain information on clustering in nuclei. -IntroductionThe presence of clusters of nucleons inside nuclei greatly enhances the cross-sections of cluster knockout and transfer reactions. It is therefore useful to study such reactions in order to determine the probabilities of various possible types of clusters.The most probable cluster in nuclei is the alpha-particle, due to its high symmetry and binding energy. Alpha-transfer and alpha knockout reactions have therefore been extensively studied in order to determine the alpha-clustering probability [1,2].One of the reactions most frequently used to study alpha-clustering in nuclei is the p; reaction, and many analyses of the differential cross-sections and analysing powers of this reaction to discrete states have been made [3] using either the triton pick-up or the alpha-particle knock-out models. Both models give rather similar results [5,4], but nuclear structure arguments favour the pick-up model. For a long time the calculations gave absolute magnitudes for the cross-section that were far too low [6,7] but detailed analyses [8] have largely removed the discrepancy, although some difficulties still remain [9].

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Microscopic and semimicroscopic analysis of the reactionAl27(p,α)

Cited by 15 publications

References 46 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

An analysis of 25Al energy levels observed in the 28Si(p, ·)25Al reaction

Analysis of (p, α) and (p,3He) cross-sections to continuum states by the Feshbach-Kerman-Koonin multistep direct theory

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Microscopic and semimicroscopic analysis of the reactionAl27(p,α)

Cited by 15 publications

References 46 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

An analysis of 25Al energy levels observed in the 28Si(p, ·)25Al reaction

Analysis of (p, α) and (p,3He) cross-sections to continuum states by the Feshbach-Kerman-Koonin multistep direct theory

Contact Info

Product

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