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Buchmann, L.; Gete, E.; Chow, James C. L.; King, J.D.; Measday, D.F.

doi:10.1103/physrevc.63.034303

Cited by 38 publications

(76 citation statements)

References 19 publications

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“…[26]. In the literature a different normalization has been suggested [23]: (3) (with E j b max = ∞ in Ref. [23]), which differs for the 0 + channel by about 30% with our choice of E j b max .…”

Section: R-matrix Formalismmentioning

confidence: 99%

R-matrix analysis of theβdecays ofN12
Hyldegaard¹,
Alcorta²,
Bastin³
et al. 2010
Phys. Rev. C
62
7
41
0
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The β decays of 12 N and 12 B have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0 + and 2 + strengths in the triple-α continuum. For the first time a complete treatment of 3α decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0 + and 2 + state is needed to reproduce the spectra. Broad 0 + 3 and 2 + 2 states are found between 10.5 and 12 MeV in this work. The presence of β strength up to the 12 N Q-value window suggests the presence of additional 0 + and 2 + components in the 12 C structure at energies above 12.7 MeV.

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Section: R-matrix Formalismmentioning

confidence: 99%

R-matrix analysis of theβdecays ofN12
Hyldegaard¹,
Alcorta²,
Bastin³
et al. 2010
Phys. Rev. C
62
7
41
0
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“…An R-matrix fit revealed that a low energy part of the continuum consists of a tail of the ground state [17].…”

Section: Resonances Of 9 Bementioning

confidence: 99%

“…An attempt to estimate the contribution of the analogue background continuum to the α(αn, γ) 9 Be reaction rate through the 5 He + α channel was made, showing that it possibly dominates the rate for high temperatures above T 9 ≈ 4 [17,41]. This result may be qualitatively consistent with the result of a recent microscopic three-cluster study of photoneutron cross sections for 9 Be which showed that the 5 He + α channel is of growing importance above E γ ≈ 4 MeV [42].…”

Section: Resonances Of 9 Bementioning

confidence: 99%

“…The contribution through the 5 He + α channel is not included because of a lack of sufficient experimental information on the 5 He + α channel. Clearly, the evaluation of the stellar reaction rate at the next level must await a new experimental outcome for the decay of relevant states in 9 Be through the 5 He + α channel (particle-and γ-widths and branching ratios of decays) which is expected in the proposed experiment of β-delayed particle decay of 9 Li [16,17].…”

Section: Resonances Of 9 Bementioning

confidence: 99%

“…Therefore, the resonance structure of 9 Be near the threshold for 8 Be+n at 1.665 MeV is of great importance [15]. It is noted that the reaction α + n ⇀ ↽ 5 He(α,γ) 9 Be with the lifetime of 5 He (∼ 10 −21 s) can make an additional contribution to the formation of 9 Be [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Astrophysical reaction rate for α(αn,γ)9Be by photodisintegration

et al. 2002

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We study the astrophysical reaction rate for the formation of 9 Be through the three body reaction α(αn, γ). This reaction is one of the key reactions which could bridge the mass gap at A = 8 nuclear systems to produce intermediate-to-heavy mass elements in alpha-and neutron-rich environments such as r-process nucleosynthesis in supernova explosions, s-process nucleosynthesis in asymptotic giant branch (AGB) stars, and primordial nucleosynthesis in baryon inhomogeneous cosmological models. To calculate the thermonuclear reaction rate in a wide range of temperatures, we numerically integrate the thermal average of cross sections assuming a two-steps formation through a metastable 8 Be, α + α ⇀ ↽ 8 Be(n,γ) 9 Be. Off-resonant and on-resonant contributions from the ground state in 8 Be are taken into account. As input cross section, we adopt the latest experimental data by photodisintegration of 9 Be with laser-electron photon beams, which covers all relevant resonances in 9 Be. Experimental data near the neutron threshold are added with γ-ray flux corrections and a new least-squares analysis is made to deduce resonance parameters in the Breit-Wigner formulation. Based on the photodisintegration cross section, we provide the reaction rate for α(αn, γ) 9 Be in the temperature range from T 9 =10 −3 to T 9 =10 1 (T 9 is the temperature in units of 10 9 K) both in the tabular form and in the analytical form for potential usage in nuclear reaction network calculations.The calculated reaction rate is compared with the reaction rates of the CF88 and the NACRE compilations. The CF88 rate, which is based on the photoneutron cross section for the 1/2 + state in 9 Be by Berman et al., is valid at T 9 > 0.028 due to lack of the off-resonant contribution. The CF88 rate differs from the present rate by a factor of two in a temperature range T 9 ≥ 0.1. The NACRE rate, which adopted different sources of experimental information on resonance states in 9 Be, is 4-12 times larger than the present rate at T 9 ≤ 0.028, but is consistent with the present rate to within ±20% at T 9 ≥ 0.1. 2

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Tables of Excitations From Reactions With Charged Particles. Part 1: Z = 3 - 36

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β−delayedparticle decay of

Cited by 38 publications

References 19 publications

R-matrix analysis of theβdecays ofN12
Hyldegaard¹,
Alcorta²,
Bastin³
et al. 2010
Phys. Rev. C
62
7
41
0
View full text Add to dashboard Cite

R-matrix analysis of theβdecays ofN12
Hyldegaard¹,
Alcorta²,
Bastin³
et al. 2010
Phys. Rev. C
62
7
41
0
View full text Add to dashboard Cite

Astrophysical reaction rate for α(αn,γ)9Be by photodisintegration

5-Boron

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β−delayedparticle decay of

Cited by 38 publications

References 19 publications

R-matrix analysis of theβdecays ofN12Hyldegaard1, Alcorta2, Bastin3 et al. 2010Phys. Rev. C627410View full textAdd to dashboardCite

R-matrix analysis of theβdecays ofN12Hyldegaard1, Alcorta2, Bastin3 et al. 2010Phys. Rev. C627410View full textAdd to dashboardCite

Astrophysical reaction rate for α(αn,γ)9Be by photodisintegration

5-Boron

Contact Info

Product

Resources

About

R-matrix analysis of theβdecays ofN12
Hyldegaard¹,
Alcorta²,
Bastin³
et al. 2010
Phys. Rev. C
62
7
41
0
View full text Add to dashboard Cite

R-matrix analysis of theβdecays ofN12
Hyldegaard¹,
Alcorta²,
Bastin³
et al. 2010
Phys. Rev. C
62
7
41
0
View full text Add to dashboard Cite