A spectroscopic study of 18F

Sens, J.C.; Pape, A.; Armbruster, R.

doi:10.1016/0375-9474(73)90548-4

Cited by 21 publications

(17 citation statements)

References 27 publications

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“…Finally, it is important to note that the resonance strength of the 519 keV resonance is in excellent agreement with the more recent measurement by Fox et al The experimental uncertainties arise primarily from statistics, the uncertainty in the absolute (8%) and relative (3%) peak efficiency and the uncertainty of the effective stopping power (∼ 4%). The branching ratios for the strong transitions reported in Table II agree very well with values found in literature [26,27]. For weaker transitions some discrepancies are observed which could point to unaccounted summing effects in the literature values.…”

Section: All Detectable Primary Transitions From the 17 O(p γ)supporting

confidence: 80%

“…This result confirms the analysis by Fox et al [11] indicating that the strengths quoted by Rolfs [13] have to be renormalized using the updated value for the E p = 632 keV resonance strength in the 27 Al(p, γ) 28 Si reaction [25]. The measurements by Sens et al [27] are systematically lower by a factor of 2 compared to the present work, possibly due to the use of unpublished stopping power values. Finally, it is important to note that the resonance strength of the 519 keV resonance is in excellent agreement with the more recent measurement by Fox et al The experimental uncertainties arise primarily from statistics, the uncertainty in the absolute (8%) and relative (3%) peak efficiency and the uncertainty of the effective stopping power (∼ 4%).…”

Section: All Detectable Primary Transitions From the 17 O(p γ)supporting

confidence: 61%

“…Full peak detection efficiencies as functions of the γ-ray energy were obtained for both setups using calibrated ( 60 Co, 137 Cs) and uncalibrated ( 56 Co) γ-ray sources as well as the well-known narrow resonances of 27 Al(p, γ) 28 Si and 14 N(p, γ) 15 O at E p = 992 keV (E c.m. = 957 keV) [17] and 278 keV (E c.m.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

“…A clear indication of this was the fact that no peak appeared in the aluminum resonance runs in the γ-ray spectra of the clover detector setup at the γ-energy of 12541 keV, where a summing-in peak usually appears from the sum of the strong 1779 and 10761 keV transitions in 28 Si. Coincidence summing-out corrections for each primary transition were calculated using a Monte Carlo program that required input for the total efficiency of the detector set-up as a function of energy and the level scheme of 18 F (taken from [26,27]). The program would simulate a million decays and subtract from the γ-ray of interest according to the coincidence γ-rays and the total efficiency information.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

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Proton capture on17O and its astrophysical implications

et al. 2012

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Background: The reaction17 O(p, γ) 18 F influences hydrogen-burning nucleosynthesis in several stellar sites, such as red giants, asymptotic giant branch (AGB) stars, massive stars and classical novae. In the relevant temperature range for these environments (T9 = 0.01-0.4), the main contributions to the rate of this reaction are the direct capture process, two low lying narrow resonances (Er = 65.1 and 183 keV) and the low-energy tails of two broad resonances (Er = 557 and 677 keV).Purpose: Previous measurements and calculations give contradictory results for the direct capture contribution which in turn increases the uncertainty of the reaction rate. In addition, very few published cross section data exist for the high energy region that might affect the interpretation of the direct capture and the contributions of the broad resonances in the lower energy range. This work aims to address these issues.Method: The reaction cross section was measured in a wide proton energy range (Ec.m. = 345 -1700 keV) and at several angles (θ lab = 0• , 45The observed primary γ-transitions were used as input in an R-matrix code in order to obtain the contribution of the direct capture and the two broad resonances to the low-energy region.Results: The extrapolated S-factor from the present data is in good agreement with the existing literature data in the low-energy region. A new reaction rate was calculated from the combined results of this work and literature S-factor determinations. Resonance strengths and branchings are reported for several 18 F states. Conclusions:We were able to extrapolate the astrophysical S-factor of the reaction 17 O(p, γ) 18 F at low energies from cross section data taken at higher energies. No significant changes in the nucleosynthesis are expected from the newly calculated reaction rate.

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Section: All Detectable Primary Transitions From the 17 O(p γ)supporting

confidence: 80%

Section: All Detectable Primary Transitions From the 17 O(p γ)supporting

confidence: 61%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

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Proton capture on17O and its astrophysical implications

et al. 2012

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“…These Tables I-III to the actual reference numbers. Table Reference Table Reference Table Reference Table Reference Table Reference Table Reference [132] cases are also flagged with a table footnote.…”

Section: B Data Tablesmentioning

confidence: 99%

Superallowed0+→0+nuclearβdecays: A critical survey with tests of the conserved vector current hypothesis and the

2005

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A complete and critical survey is presented of all half-life, decay-energy and branching-ratio measurements related to 20 superallowed 0 + → 0 + decays; no measurements are ignored, though some are rejected for cause and others updated. A new calculation of the statistical rate function f is described and experimental f t values determined. The associated theoretical corrections needed to convert these results into Ft values are discussed, and careful attention is paid to the origin and magnitude of their uncertainties. As an exacting confirmation of the conserved vector current hypothesis, the Ft values are seen to be constant to 3 parts in 10 4 . These data are also used to set a new limit on any possible scalar interaction: C S /C V = −(0.00005 ± 0.00130). The average Ft value obtained from the survey, when combined with the muon liftime, yields the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix, V ud = 0.9738 ± 0.0004; and the unitarity test on the top row of the matrix becomes |V ud | 2 + |V us | 2 + |V ub | 2 = 0.9966 ± 0.0014 using the Particle Data Group's currently recommended values for V us and V ub . We also express this result in terms of the possible existence of right-hand currents. Finally, we discuss the priorities for future theoretical and experimental work with the goal of making the CKM unitarity test more definitive.

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9-Fluorine

Sukhoruchkin¹,

Soroko²

2004

Tables of Proton and Α-Particle Resonance Parameters. Part 1

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A spectroscopic study of 18F

Cited by 21 publications

References 27 publications

Proton capture on17O and its astrophysical implications

Proton capture on17O and its astrophysical implications

Superallowed0+→0+nuclearβdecays: A critical survey with tests of the conserved vector current hypothesis and the

9-Fluorine

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