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D’Auria, J.M.; Azuma, R.E.; Bishop, S.; Buchmann, L.; Chatterjee, M. L.; Chen, A. A.; Engel, Sabine; Gigliotti, D.; Greife, U.; Hunter, D.; Hussein, A.; Hutcheon, D. A.; Jewett, C.; José, J.; King, J. D.; Laird, A.M.; Lamey, M; Lewis, R.; Liu, W.; Olin, Å.; Ottewell, D.; Parker, P. D.; Rogers, J.G.; Ruiz, C.; Trinczek, M.; Wrede, C.

doi:10.1103/physrevc.69.065803

Cited by 80 publications

(33 citation statements)

References 45 publications

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“…To put this contribution into some perspective, if the uncertainty of the array was decreased by a factor of 2 the net effect to the overall uncertainty in wy is a decrease from 21% to 19%. Another DRAGON paper [36] also adopts the 1 2 % gamma efficiency uncertainty value in the data analysis.…”

Section: Resultsmentioning

confidence: 99%

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Efficiency calibration measurement and GEANT simulation of the DRAGON BGO gamma ray array at TRIUMF.

Gigliotti¹

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Section: Resultsmentioning

confidence: 99%

“…For this reason one of the first radioactive beam experiments performed at DRAGON was the ^^Na(p, y)^^Mg and is of continuing interest [35], [36] and [37].…”

Section: N Ovae X -Ray B Ursters and Supernovaementioning

confidence: 99%

Efficiency calibration measurement and GEANT simulation of the DRAGON BGO gamma ray array at TRIUMF.

Gigliotti¹

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“…An additional three events appeared in the IC region corresponding to the 18 F locus. This number is not unexpected when the total beam intensity and DRAGON's typical suppression factor are considered; D'Auria et al [24] reported a beam suppression factor of ≈10 11 for DRAGON's EMS, in a similar mass and energy region, also with a (p,γ) reaction in inverse kinematics. However, due to the uncertainty in the region of the IC spectrum where 19 Ne recoil events were expected, these three events could also potentially have been recoils.…”

Section: E Particle Identificationmentioning

confidence: 98%

“…Target pressure and temperature are monitored via a monameter and thermocouple connected to the central cell. Adapted and reprinted with permission from [24]. Copyright 2004 by the American Physical Society.…”

Section: A Gas Target Systemmentioning

confidence: 99%

“…In DRAGON measurements, the total number of incident beam particles (N b ) is usually determined by normalizing the measured rate of target nuclei elastically scattered by the beam, into either of the two silicon detectors mounted inside the target assembly, to Faraday Cup (FC) readings from just before and after the target [24]. The detector at 30…”

Section: Beam Normalizationmentioning

confidence: 99%

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Measurement of radiative proton capture onF18and implications for oxygen-neon novae reexamined

et al. 2016

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Background: The rate of the 18 F(p,γ) 19 Ne reaction affects the final abundance of the radioisotope 18 F ejected from novae. This nucleus is important as its abundance is thought to significantly influence the first stage 511 keV and continuum γ-ray emission in the aftermath of novae. No successful measurement of this reaction existed prior to this work, and the rate used in stellar models had been calculated based on incomplete information from contributing resonances. Purpose:Of the two resonances thought to provide a significant contribution to the astrophysical reaction rate, located at Ec.m.=330 and 665 keV, the former has a radiative width estimated from the assumed analogue state in the mirror nucleus, 19 F, while the latter resonance does not have an analogue state assignment at all, resulting in an arbitrary radiative width being assumed. As such, a direct measurement was needed to establish what role this resonance played in the destruction of 18 F at nova temperatures. This paper extends and takes the place of a previous Letter which reported the strength of the Ec.m.=665 keV resonance.Method: The DRAGON recoil separator was used to directly measure the strength of the important 665 keV resonance in this reaction, in inverse kinematics, by observing 19 Ne reaction products. Radioactive 18 F beam was provided by the ISAC facility at TRIUMF. R-matrix calculations were subsequently used to evaluate the significance of the results at astrophysical energies. Results:We report the direct measurement of the 18 F(p,γ) 19 Ne reaction with the re-evaluation of several detector efficiencies and the use of an updated 19 Ne level scheme in the reaction rate analysis. The strength of the 665 keV resonance (Ex=7.076 MeV) is found to be an order of magnitude weaker than currently assumed in nova models. An improved analysis of the previously reported data is presented here, resulting in a slightly different value for the resonance strength. These small changes, however, do not alter the primary conclusions.Conclusions: Reaction rate calculations definitively show that the 665 keV resonance plays no significant role in the destruction of 18 F at novae temperatures.

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Beacons in the sky: Classical novae vs. X-ray bursts

José¹,

Hernanz²

The 2nd International Conference on Nuclear Physics in Astrophysics

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Abstract. Thermonuclear runaways are at the origin of some of the most energetic and frequent stellar cataclysmic events. In this review talk, we outline our understanding of the mechanisms leading to classical nova explosions and X-ray bursts, together with their associated nucleosynthesis. In particular, we focus on the interplay between nova outbursts and the Galactic chemical abundances (where 13 C, 15 N, and 17 O constitute the likely imprints of many nova outbursts during the overall 10 Gyr of Galactic history), the synthesis of radioactive nuclei of interest for gamma-ray astronomy ( 7 Be-7 Li, 22 Na, or 26 Al), the endpoint of nova nucleosynthesis, based on theoretical and observational grounds, and the recent discovery of presolar meteoritic grains, both in the Murchison and Acfer 094 meteorites, likely condensed in nova shells. Recent progress in the modeling of X-ray bursts as well as an insight into the input nuclear physics requests, for both novae and X-ray bursts, will also be presented.PACS. 26.50.+x Nuclear physics aspects of novae, supernovae, and other explosive environments -26.30.+k Nucleosynthesis in novae, supernovae and other explosive environments -95.85.Pw γ-ray -97.80.Gm Cataclysmic binaries (novae, dwarf novae, recurrent novae, and nova-like objects); symbiotic stars

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TheNa21(p,γ)Mg22reaction fro

Cited by 80 publications

References 45 publications

Efficiency calibration measurement and GEANT simulation of the DRAGON BGO gamma ray array at TRIUMF.

Efficiency calibration measurement and GEANT simulation of the DRAGON BGO gamma ray array at TRIUMF.

Measurement of radiative proton capture onF18and implications for oxygen-neon novae reexamined

Beacons in the sky: Classical novae vs. X-ray bursts

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