A nuclear structure study of 19F levels from the 18O(3He, d)19F reaction

Green, L.L.; Lennon, C.O.; Naqib, I.M.

doi:10.1016/0375-9474(70)90480-x

Cited by 45 publications

(5 citation statements)

References 22 publications

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“…The constant N thus depends not only on bound state potential parameters (which were chosen to have standard values as used in (3He, d). The value of the spectroscopic factor obtained SZ=0.36 is in good agreement with those obtained from other experiments (3He, d) as SZ=0.42 [16] and $2=0.45 [17].…”

Section: E-~r Ep(r)~(sn)2~ -~ ~Rsupporting

confidence: 90%

Elastic scattering of15N on19F,19F on18O and19F on16O at low energies and elastic transfer

et al. 1973

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Angular distributions of the elastic scattering in the range of 30-160 ~ OCM have been measured for the systems 15N+ 19F, 19F+ 160 and 19F+ 1sO at three energies, the highest being approximately 4 MeV above the Coulomb barrier. The large differences observed in the structure of the angular distributions at large angles are discussed considering elastic transfer, and the angular momentum balance for the possible direct surface reactions. The analysis yields a consistent description of the data in terms of elastic transfer.

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Section: E-~r Ep(r)~(sn)2~ -~ ~Rsupporting

confidence: 90%

Elastic scattering of15N on19F,19F on18O and19F on16O at low energies and elastic transfer

et al. 1973

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“…To further assess the validity of the collective model, we have also calculated relative spectroscopic factors for proton stripping (pickup) reactions on (to) 18 O and compared them with experimental data [25,26] in Table II, showing similar agreement with the experiment.…”

Section: Resultsmentioning

confidence: 88%

“…Spectroscopic information from the 18 O( 3 He, d ) and19 F(d,3 He) reactions[25,26] compared with our Nilsson calculations.…”

mentioning

confidence: 99%

Analysis of the 18Fg,m(d,p)F
Macchiavelli
¹
,
Crawford
²
,
Fallon
³

et al. 2020
Phys. Rev. C
3
0
1
0
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Spectroscopic strengths for the 18 F g,m (d, p) 19 F reactions to members of the ground-state band in 19 F are interpreted in the rotational model. The analysis considers two different coupling schemes, namely, the strong and decoupled limits of the particle rotor model to describe the ground and isomeric states of 18 F, as well as the transitions to the ground-state band in 19 F. Our results, obtained using Nilsson amplitudes for the neutron levels 1 2 [220], 3 2 [211], and 5 2 [202] calculated at a deformation 2 = 0.32 are in agreement with the measurements and USDB shell-model calculations.

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“…1 is inapplicable to the case of interference with a broad resonance of the same J π . Kahl et al (2019) unambiguously identified an ℓ = 0 state at 6.130(5) MeV in 19 Ne using a model-independent approach, and based on the systematics of Coulomb energy differences strongly favored pairing this state with the 1/2 + 6.255-MeV state in 19 F. This conclusion is supported by the significant strength from a 1/2 + resonance in 19 Ne observed near ∼ 6.1 MeV (Laird 2000;Laird et al 2002) with a magnitude comparable to population of the 1/2 + 6.225-MeV state in analogous studies of 19 F (Green et al 1970;Schmidt & Duhm 1970). Torresi et al (2017) observed the signature of a 1/2 state of ambiguous parity in 19 Ne at 6.197(8)(50) [statistical and systematic uncertainties] with a large Γ α of 16 keV.…”

Section: Nuclear Physics Uncertaintiesmentioning

confidence: 82%

Uncertainties in the $^{18}$F(p,$α$)$^{15}$O reaction rate in classical novae

Kahl,

José,

Woods

2021

Preprint

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Context. Direct observation of γ-ray emission from the decay of 18 F ejected in classical nova outbursts remains a major focus of the nuclear astrophysics community. However, modeling the abundance of ejected 18 F, and thus the predicted detectability distance of a γ-ray signal near 511 keV emitted from these transient thermonuclear episodes, is hampered by significant uncertainties in our knowledge of the key 18 F(p, α) reaction rate. Aims. We analyze uncertainties in the most recent nuclear physics experimental results employed to calculate the 18 F(p, α) reaction rate. Our goal is to determine which uncertainties have the most profound influence on the predicted abundance of 18 F ejected from novae, in order to guide future experimental works. Methods. We calculated a wide range of 18 F(p, α) reaction rates using R-Matrix formalism, allowing us to take into account all interference effects. Using a selection of 16 evenly-spaced rates over the full range, we performed 16 new hydrodynamic nova simulations.Results. We performed one of the most thorough theoretical studies of the impact of the 18 F(p, α) reaction in classical novae to date. The 18 F(p, α) rate remains highly uncertain at nova temperatures, resulting in a factor ∼ 10 uncertainty in the predicted abundance of 18 F ejected from nova explosions. We also found that the abundance of 18 F may be strongly correlated with that of 19 F. Conclusions. Despite numerous nuclear physics uncertainties affecting the 18 F(p, α) reaction rate, which are dominated by unknown interference signs between 1/2 + and 3/2 + resonances, future experimental work should focus on firmly and precisely determining the directly measurable quantum properties of the subthreshold states in the compound nucleus 19 Ne near 6.13 and 6.29 MeV.

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A nuclear structure study of 19F levels from the 18O(3He, d)19F reaction

Cited by 45 publications

References 22 publications

Elastic scattering of15N on19F,19F on18O and19F on16O at low energies and elastic transfer

Elastic scattering of15N on19F,19F on18O and19F on16O at low energies and elastic transfer

Analysis of the 18Fg,m(d,p)F
Macchiavelli
¹
,
Crawford
²
,
Fallon
³

et al. 2020
Phys. Rev. C
3
0
1
0
View full text Add to dashboard Cite

Uncertainties in the $^{18}$F(p,$α$)$^{15}$O reaction rate in classical novae

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A nuclear structure study of 19F levels from the 18O(3He, d)19F reaction

Cited by 45 publications

References 22 publications

Elastic scattering of15N on19F,19F on18O and19F on16O at low energies and elastic transfer

Elastic scattering of15N on19F,19F on18O and19F on16O at low energies and elastic transfer

Analysis of the 18Fg,m(d,p)FMacchiavelli1, Crawford2, Fallon3 et al. 2020Phys. Rev. C3010View full textAdd to dashboardCite

Uncertainties in the $^{18}$F(p,$α$)$^{15}$O reaction rate in classical novae

Contact Info

Product

Resources

About

Analysis of the 18Fg,m(d,p)F
Macchiavelli
¹
,
Crawford
²
,
Fallon
³

et al. 2020
Phys. Rev. C
3
0
1
0
View full text Add to dashboard Cite