Investigation of two resonances in the18O(p, n)18F reaction

Fritsch, W.; Büchs, K.D.; Finckh, E.; Pietrzyk, P.; Schreiber, Bernd

doi:10.1007/bf01394808

Cited by 9 publications

(2 citation statements)

References 14 publications

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“…The use of the 18 O(p, n) 18 F reaction to generate the medical radioisotope 18 F and as a neutron source means that it has been studied in great detail using both activation techniques [23] and direct measurement of the neutron flux [17,[24][25][26]. The study of Beard et al [17] provides probably the most complete spectroscopy of the 18 O(p, n) 18 F reaction in the region of the neutron threshold.…”

Section: Ex [Mev]mentioning

confidence: 99%

Charged-particle branching ratios above the neutron threshold in F19 : Constraining N15 production in core-collapse supern

Adsley¹,

Hammache²,

Séréville³

et al. 2021

Phys. Rev. C

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Background: Spatially-correlated overabundances of 15 N and 18 O observed in some low-density graphite meteoritic grains have been connected to nucleosynthesis taking place in the helium-burning shell during core-collapse supernovae. Two of the reactions which have been identified as important to the final abundances of 15 N and 18 O are 18 F(n, α) 15 N and 18 F(n, p) 18 O.Purpose: The relative strengths of the 18 F(n, α) 15 N and 18 F(n, p) 18 O reactions depend sensitively on the relative α0 and p0 decay branches from states above the neutron threshold in 19 F in addition to other properties such as the spins and parities, and the neutron widths. However, experimental data on the charged-particle decays from these highly excited states are lacking or inconsistent.Method: Two experiments were performed using proton inelastic scattering from LiF targets and magnetic spectrographs. The first experiment used the high-resolution Q3D spectrograph at Munich to constrain the properties of levels in 19 F. A second experiment using the Orsay Split-Pole spectrograph and an array of silicon detectors was performed in order to measure the charged-particle decays of neutron-unbound levels in 19 F.Results: A number of levels in 19 F have been identified along with their corresponding charged-particle decays. The first state above the neutron threshold which has an observed proton-decay branch to the ground state of 18 O lies 68 keV (Ex = 10.5 MeV) above the neutron threshold. The α-particle decays from the neutron-unbound levels are generally observed to be much stronger than the proton decays. Conclusion:Neutron-unbound levels in 19 F are observed to decay predominantly by α-particle emission, supporting the role of 18 F(n, α) 15 N in the production of 15 N in the helium-burning shell of supernovae. Improved resonant-scattering reaction data are required in order to be able to determine the reaction rates accurately. I. ASTROPHYSICAL BACKGROUND *

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Section: Ex [Mev]mentioning

confidence: 99%

Charged-particle branching ratios above the neutron threshold in F19 : Constraining N15 production in core-collapse supern

Adsley¹,

Hammache²,

Séréville³

et al. 2021

Phys. Rev. C

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“…18 O(p, n) 18 F reaction For formation of 18 F through the commercially used 18 O(p,n) 18 F reaction, a grand total of eleven publications [57,[71][72][73][74][75][76][77][78][79][80][81] with experimental cross-section data were identified in the literature for incident particle energies up to 25 MeV and are represented with uncertainties in Fig. 5(a).…”

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confidence: 99%

Upgrade of IAEA recommended data of selected nuclear reactions for production of PET and SPECT isotopes

Hermanne

Tárkányi

Ignatyuk

et al. 2020

Preprint

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An IAEA research project was dedicated to the compilation, evaluation and recommendation of cross-section data for the accelerator production of 11 C, 13 N, 15 O, 18 F, 64 Cu, and 124 I positronemitting radionuclides clinically used for PET imaging, and for the accelerator production of two gamma emitters, 81 Rb and 123 I, used in SPECT imaging. Cross sections for 19 charged-particle induced reactions that can be employed for radionuclide accelerator production were evaluated including uncertainties. The resulting reference cross-section data were obtained from Padé fits to selected and corrected experimental data, and integral thick target yields were subsequently deduced. Uncertainties in the fitted results were estimated via a Padé least-squares method with the addition of a 4% assessed systematic uncertainty to the estimated experimental uncertainty. Experimental data were also compared with theoretical predictions available from the TENDL library. All of the numerical reference cross-section data with their corresponding uncertainties and deduced integral thick target yields are available on-line at the IAEA-NDS medical portal www-nds.iaea.org/medportal/ and also at the IAEA-NDS web page www-nds.iaea.org/medical/ .

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9-Fluorine

Sukhoruchkin¹,

Soroko²

2004

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

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Investigation of two resonances in the18O(p, n)18F reaction

Cited by 9 publications

References 14 publications

Charged-particle branching ratios above the neutron threshold in F19 : Constraining N15 production in core-collapse supern

Charged-particle branching ratios above the neutron threshold in F19 : Constraining N15 production in core-collapse supern

Upgrade of IAEA recommended data of selected nuclear reactions for production of PET and SPECT isotopes

9-Fluorine

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