Levels in 15N resulting from the proton capture of 14C

Siefken, H.E.; Cockburn, P.M.; Krone, R.W.

doi:10.1016/0375-9474(69)90983-x

Cited by 20 publications

(4 citation statements)

References 30 publications

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“…ωγ can be derived from the present measurement, and compared to the literature (Table VII). The measured new resonance strength is in agreement with [33], but in disagreement with the values reported in [34,35] TABLE VII. Strength of the 527 keV proton resonance in 14 C(p,γ) 15 N reaction (Ex = 10.702 MeV).…”

Section: B Levels Above the Proton Separation Thresholdsupporting

confidence: 71%

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Determination ofγ-ray widths inN15using nuclear resonance fluorescence

et al. 2015

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Background: The stable nucleus15 N is the mirror of 15 O, the bottleneck in the hydrogen burning CNO cycle. Most of the 15 N level widths below the proton emission threshold are known from just one nuclear resonance fluorescence (NRF) measurement, with limited precision in some cases. A recent experiment with the AGATA demonstrator array determined level lifetimes using the Doppler shift attenuation method in 15 O. As a reference and for testing the method, level lifetimes in 15 N have also been determined in the same experiment.Purpose: The latest compilation of 15 N level properties dates back to 1991. The limited precision in some cases in the compilation calls for a new measurement to enable a comparison to the AGATA demonstrator data. The widths of several 15 N levels have been studied with the NRF method. Method:The solid nitrogen compounds enriched in 15 N have been irradiated with bremsstrahlung. The γ-rays following the deexcitation of the excited nuclear levels were detected with four high-purity germanium detectors.Results: Integrated photon-scattering cross sections of 10 levels below the proton emission threshold have been measured. Partial gamma-ray widths of ground-state transitions were deduced and compared to the literature. The photon scattering cross sections of two levels above the proton emission threshold, but still below other particle emission energies have also been measured, and proton resonance strengths and proton widths were deduced.Conclusions: Gamma and proton widths consistent with the literature values were obtained, but with greatly improved precision.

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Section: B Levels Above the Proton Separation Thresholdsupporting

confidence: 71%

“…The resonance strength in the 14 C(p,γ) 15 N reaction populating the 10.702-MeV level in 15 N was determined for the first time from a gamma scattering experiment, and found to be in agreement with a previous value [33], but in contradiction with others [34,35].…”

Section: Discussionmentioning

confidence: 50%

Determination ofγ-ray widths inN15using nuclear resonance fluorescence

et al. 2015

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“…The observation of dipole plus quadrupole capture ?-rays to the ground state had led Bartholomew et aL [11] to a 3/2-assignment assuming M1/E2 radiation. The strongly anisotropic ?-ray angular distribution [11,12] immediately rules out a J= 1/2 assignment. Also the reported quadrupole admixtures are hardly compatible with the accepted 3/2 + assignment, since in this case one should expect only very weak M2 admixtures to the predominantly E1 contribution.…”

Section: Experiments and Resultsmentioning

confidence: 96%

On mirror states of negative parity in mass 15 nuclei

Mairle

Wagner

1973

Z. Physik

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“…Earlier measurements for the two levels under study have been done by Hebbard and Dunbar [7] (HD-PR), Siefken et al [8] (SIE-NPA), and Beukens [9] (BEU-PhD); only a minor part of the Ph.D. thesis BEU-PhD has been published [10]. As there is no good agreement between the data by HD-PR, SIE-NPA, and BEU-PhD, and the unpublished data of BEU-PhD have been normalized to one particular resonance strength of SIE-NPA, we confirm to adopt the latest resonance strengths ωγ by GOE-NPA: ωγ(10702) = 840 ± 130 meV and ωγ(10804) = 270 ± 40 meV.…”

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confidence: 99%

Addendum to “Determination ofγ-ray widths inN15using nuclear resonance fluorescence”

Szücs

Mohr

2015

Phys. Rev. C

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The determination of absolute widths of two observed levels above the proton threshold in 15 N has been improved by a combined analysis of our recent 15 N(γ,γ ′ ) 15 N * photon scattering data, resonance strengths ωγ of the 14 C(p,γ) 15 N reaction, and γ-ray branchings bγ,i in 15 N. The revised data are compared to the adopted values, and some inconsistencies in the adopted values are illustrated.

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Levels in 15N resulting from the proton capture of 14C

Cited by 20 publications

References 30 publications

Determination ofγ-ray widths inN15using nuclear resonance fluorescence

Determination ofγ-ray widths inN15using nuclear resonance fluorescence

On mirror states of negative parity in mass 15 nuclei

Addendum to “Determination ofγ-ray widths inN15using nuclear resonance fluorescence”

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