The photoneutron cross section of 9Be

Hughes, Richard; Sambell, R.H.; Muirhead, E.G.; Spicer, B.M.

doi:10.1016/0375-9474(75)90348-6

Cited by 21 publications

(7 citation statements)

References 18 publications

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“…The present data, over the broad 1/2 − and 5/2 + resonances near 3 MeV, are in fair agreement with the data of Refs. [17,21] but not in agreement with the results of Ref. [24] which were obtained with a large photon-beam energy spread.…”

Section: The 9 Be(γ N) 8 Be Cross Sectionmentioning

confidence: 81%

“…Previous 9 Be photodisintegration studies are numerous [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] but reveal relatively large cross-section uncertainties in the astrophysically important region near the neutron emission threshold. New (γ, n) cross-section measurements with improved accuracy are now possible using intense photon beams with small energy spreads and neutron detectors with large solid angle coverage and high efficiencies.…”

Section: Introductionmentioning

confidence: 99%

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Cross-section measurement of9Be(γ,n)8Be and implications for
Arnold
¹
,
Clegg
²
,
Iliadis
³

et al. 2012
Phys. Rev. C

146

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Models of the r process are sensitive to the production rate of 9 Be because, in explosive environments rich in neutrons, α(αn, γ ) 9 Be is the primary mechanism for bridging the stability gaps at A = 5 and A = 8. The α(αn, γ ) 9 Be reaction represents a two-step process, consisting of α + α → 8 Be followed by 8 Be(n, γ ) 9 Be. We report here on a new absolute cross-section measurement for the 9 Be(γ, n) 8 Be reaction conducted using a highly efficient, 3 He-based neutron detector and nearly monoenergetic photon beams, covering energies from E γ = 1.5 MeV to E γ = 5.2 MeV, produced by the High Intensity γ -ray Source of Triangle Universities Nuclear Laboratory. In the astrophysically important threshold energy region, the present cross sections are 40% larger than those found in most previous measurements and are accurate to ±10% (95% confidence). The revised thermonuclear α(αn, γ ) 9 Be reaction rate could have implications for the r process in explosive environments such as type II supernovae.

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Section: The 9 Be(γ N) 8 Be Cross Sectionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Cross-section measurement of9Be(γ,n)8Be and implications for
Arnold
¹
,
Clegg
²
,
Iliadis
³

et al. 2012
Phys. Rev. C

146

View full text Add to dashboard Cite

show abstract

“…The experimental measurements of the low-energy E1 strength in 9 Be by photodisintegration have been performed mainly in astrophysical interests [79][80][81][82][83]. In these years, precise data of the E1 strength for low-lying positive-parity states of 9 Be have been reported [83].…”

Section: Introductionmentioning

confidence: 99%

Isovector and isoscalar dipole excitations inBe9andBe10studied with antisymmetrized molecular dynamics

Kanada-En’yo

2016

Phys. Rev. C

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Isovector and isoscalar dipole excitations in 9 Be and 10 Be are investigated in the framework of antisymmetrized molecular dynamics, in which angular-momentum and parity projections are performed. In the present method, 1p-1h excitations on the ground state and large amplitude α-cluster mode are incorporated. The isovector giant dipole resonance (GDR) in E > 20 MeV shows the two peak structure which is understood by the dipole excitation in the 2α core part with the prolate deformation. Because of valence neutron modes against the 2α core, low-energy E1 resonances appear in E < 20 MeV exhausting about 20% of the Thomas-Reiche-Kuhn sum rule and 10% of the calculated energy-weighted sum. The dipole resonance at E ∼ 15 MeV in 10 Be can be interpreted as the parity partner of the ground state having a 6 He+α structure and has the remarkable E1 strength because of coherent contribution of two valence neutrons. The ISD strength for some low-energy resonances are significantly enhanced by the coupling with the α-cluster mode. The calculated E1 strength of 9 Be reasonably describes the global feature of experimental photonuclear cross sections consisting of the low-energy strength in E < 20 MeV and the GDR in E > 20 MeV.

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“…was positioned in front of the Mercury pulsed-power source to produce photoneutrons through the 9 Be(γ,n)2α reaction. The Mercury source is an inductive voltage adder configured to deposit 130 kA of electrons on a tantalum bremsstrahlung converter in 30 ns, resulting in an intense bremsstrahlung beam with an endpoint energy of approximately 5 MeV, well above the neutron binding energy of 9 Be at 1.67 MeV [7].…”

Section: Experimental Apparatusmentioning

confidence: 99%

Beryllium and Indium Activation Measurements of Total Neutron Yield from a Fast-Pulsed Photoneutron Source

Author¹

2018

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The photoneutron cross section of 9Be

Cited by 21 publications

References 18 publications

Cross-section measurement of9Be(γ,n)8Be and implications for
Arnold
¹
,
Clegg
²
,
Iliadis
³

et al. 2012
Phys. Rev. C

Cross-section measurement of9Be(γ,n)8Be and implications for
Arnold
¹
,
Clegg
²
,
Iliadis
³

et al. 2012
Phys. Rev. C

Isovector and isoscalar dipole excitations inBe9andBe10studied with antisymmetrized molecular dynamics

Beryllium and Indium Activation Measurements of Total Neutron Yield from a Fast-Pulsed Photoneutron Source

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The photoneutron cross section of 9Be

Cited by 21 publications

References 18 publications

Cross-section measurement of9Be(γ,n)8Be and implications forArnold1, Clegg2, Iliadis3 et al. 2012Phys. Rev. C

Cross-section measurement of9Be(γ,n)8Be and implications forArnold1, Clegg2, Iliadis3 et al. 2012Phys. Rev. C

Isovector and isoscalar dipole excitations inBe9andBe10studied with antisymmetrized molecular dynamics

Beryllium and Indium Activation Measurements of Total Neutron Yield from a Fast-Pulsed Photoneutron Source

Contact Info

Product

Resources

About

Cross-section measurement of9Be(γ,n)8Be and implications for
Arnold
¹
,
Clegg
²
,
Iliadis
³

et al. 2012
Phys. Rev. C

Cross-section measurement of9Be(γ,n)8Be and implications for
Arnold
¹
,
Clegg
²
,
Iliadis
³

et al. 2012
Phys. Rev. C