Experimental determination of the $^{17}O(p,\alpha)^{14}N$ and $^{17}O(p,\gamma)^{18}F$ reaction rates
| dc.contributor.author | CHAFA, A. | |
| hal.structure.identifier | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse [CSNSM] | |
| dc.contributor.author | TATISCHEFF, V. | |
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| dc.contributor.author | AGUER, P. | |
| dc.contributor.author | BARHOUMI, S. | |
| hal.structure.identifier | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse [CSNSM] | |
| dc.contributor.author | COC, A. | |
| hal.structure.identifier | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse [CSNSM] | |
| dc.contributor.author | GARRIDO, F. | |
| dc.contributor.author | HERNANZ, M. | |
| dc.contributor.author | JOSÉ, J. | |
| hal.structure.identifier | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse [CSNSM] | |
| dc.contributor.author | KIENER, J. | |
| hal.structure.identifier | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse [CSNSM] | |
| dc.contributor.author | LEFEBVRE-SCHUHL, A. | |
| dc.contributor.author | OUICHAOUI, S. | |
| hal.structure.identifier | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse [CSNSM] | |
| dc.contributor.author | DE SÉRÉVILLE, N. | |
| hal.structure.identifier | Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse [CSNSM] | |
| dc.contributor.author | THIBAUD, J.-P. | |
| dc.date.issued | 2007 | |
| dc.identifier.issn | 2469-9985 | |
| dc.description.abstractEn | The $^{17}O(p,\alpha)^{14}N$ and $^{17}O(p,\gamma)^{18}F$ reactions are of major importance to hydrogen-burning nucleosynthesis in a number of different stellar sites. In particular, $^{17}O$ and $^{18}F$ nucleosynthesis in classical novae is strongly dependent on the thermonuclear rates of these two reactions. The previously estimated rate for $^{17}O(p,\alpha)^{14}N$ carries very large uncertainties in the temperature range of classical novae (T=0.01-0.4 GK), whereas a recent measurement has reduced the uncertainty of the $^{17}O(p,\gamma)^{18}F$ rate. We report on the observation of a previously undiscovered resonance at Ec.m.=183.3 keV in the $^{17}O(p,\alpha)^{14}N$ reaction, with a measured resonance strength $\omega\gammap\alpha=(1.6\pm0.2)×10^{-3}$ eV. We studied in the same experiment the $^{17}O(p,\gamma)^{18}F$ reaction by an activation method, and the resonance strength was found to amount to $\omega\gammap\gamma=(2.2\pm0.4)×10^{-6}$ eV. The excitation energy of the corresponding level in 18F was determined to be 5789.8$\pm$0.3 keV in a Doppler shift attenuation method measurement, which yielded a value of $\tau$<2.6 fs for the level lifetime. The $^{17}O(p,\alpha)^{14}N$ and $^{17}O(p,\gamma)^{18}F$ reaction rates were calculated using the measured resonance properties and reconsidering some previous analyses of the contributions of other levels or processes. The $^{17}O(p,\alpha)^{14}N$ rate is now well established below T=1.5 GK, with uncertainties reduced by orders of magnitude in the temperature range T=0.1-0.4 GK. The uncertainty in the $^{17}O(p,\gamma)^{18}F$ rate is somewhat larger because of remaining obscurities in the knowledge of the direct capture process. These new resonance properties have important consequences for $^{17}$O nucleosynthesis and gamma-ray emission of classical novae. | |
| dc.language.iso | en | |
| dc.publisher | American Physical Society | |
| dc.subject.en | proton radiative capture | |
| dc.subject.en | nuclei with mass number 6 to 19 | |
| dc.subject.en | nucleosynthesis | |
| dc.subject.en | stellar internal processes | |
| dc.subject.en | novae | |
| dc.subject.en | nuclear resonances | |
| dc.subject.en | nuclear energy level lifetimes | |
| dc.title.en | Experimental determination of the $^{17}O(p,\alpha)^{14}N$ and $^{17}O(p,\gamma)^{18}F$ reaction rates | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1103/PhysRevC.75.035810 | |
| dc.subject.hal | Physique [physics]/Physique Nucléaire Expérimentale [nucl-ex] | |
| bordeaux.journal | Physical Review C | |
| bordeaux.page | 035810 | |
| bordeaux.volume | 75 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | in2p3-00147329 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Non spécifiée | |
| hal.origin.link | https://hal.archives-ouvertes.fr//in2p3-00147329v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20C&rft.date=2007&rft.volume=75&rft.spage=035810&rft.epage=035810&rft.eissn=2469-9985&rft.issn=2469-9985&rft.au=CHAFA,%20A.&TATISCHEFF,%20V.&AGUER,%20P.&BARHOUMI,%20S.&COC,%20A.&rft.genre=article |
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