Properties of levels in22Ne

Olivier, L.; Richter, W. A.; Stander, J. A.; Koen, J. W.

doi:10.1007/bf01284676

Cited by 11 publications

(67 citation statements)

References 33 publications

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“…• or less in this measurement, the 22 Mg recoils emerged at scattering angles up to 0. proton decay results in a small angular spread about the original 22 Mg trajectory, but the high incident beam energy and low decay energies of the states studied limited the laboratory scattering angles of the 21 Na decay products to 0.5…”

Section: Experimental Methodsmentioning

confidence: 72%

“…The γ-decay spectrum obtained from 22 Mg-triton coincidences is shown in Fig. 2, and the proton-decay spectrum obtained from 21 Na-triton coincidences is displayed in Fig.…”

Section: Excitation Energies Of Thementioning

confidence: 99%

“…One important observational test of the models would be the detection of γ-rays emitted by nuclei synthesized in a nova outburst [3]. Since classical novae synthesize 22 Na, the 1.275 MeV γ-ray emitted by its β + daughter 22 Ne is a good candidate for such detection efforts. An observational campaign conducted with the COMPTEL instrument on NASA's Compton Gamma Ray Observatory failed to positively detect any 22 Na γ-rays from galactic novae, placing a tight upper limit on their 22 Na production and ejection [4].…”

Section: Introductionmentioning

confidence: 99%

“…Knowledge of the 21 Na(p, γ) 22 Mg rate is essential for making quantitative predictions about the total 22 Na yield in a nova explosion [5]. At low temperatures, this * Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver BC V6T2A3, Canada; davids@triumf.ca reaction proceeds dominantly by direct capture, but at higher temperatures, resonant contributions from excited states in 22 Mg become important. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1 shows a level diagram of 22 Mg near the proton threshold. Recently, the first direct measurement of the resonance strength of the 5.714 MeV state in 22 Mg that dominates the 21 Na(p, γ) 22 Mg reaction rate at nova temperatures was carried out at TRIUMF [6].…”

Section: Introductionmentioning

confidence: 99%

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Proton-decaying states inMg22and the nucleosynthesis ofNa22<

et al. 2003

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Populating states in22 Mg via the (p, t) reaction in inverse kinematics with a 55 MeV/nucleon 24 Mg beam, we have measured the proton-decay branching ratios of the levels at 5.96 MeV and 6.05 MeV and obtained an experimental upper limit on the branching ratio of the 5.71 MeV state. On the basis of the present and previous measurements, we assign spins and parities to the 5.96 MeV and 6.05 MeV states. We combine our branching ratios with independent measurements of the lifetimes of these states or their 22 Ne analogs to compute the resonance strengths and thereby the astrophysical rate of the 21 Na(p, γ) 22 Mg reaction. We perform hydrodynamic calculations of nova outbursts with this new rate and analyze its impact on 22 Na yields.

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Section: Experimental Methodsmentioning

confidence: 72%

“…The γ-decay spectrum obtained from 22 Mg-triton coincidences is shown in Fig. 2, and the proton-decay spectrum obtained from 21 Na-triton coincidences is displayed in Fig.…”

Section: Excitation Energies Of Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Proton-decaying states inMg22and the nucleosynthesis ofNa22<

et al. 2003

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Nuclear Data Sheets for

Firestone

2005

Nuclear Data Sheets

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Nuclear Data Sheets for A = 22

Basunia

2015

Nuclear Data Sheets

115

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A b s t r a c t : E v a l u a t e d s p e c t r o s c o p i c d a t a a n d l e v e l s c h e m e s f r o m r a d i o a c t i v e d e c a y a n d n u c l e a r r e a c t i o n s t u d i e s are presented for . This evaluation for A=22 supersedes the earlier one by R. B. Firestone (2005Fi16). Cutoff Date: All data received by April 1, 2015 have been evaluated. The NSR database (2014Pr09) (www.nndc.bnl. gov/nsr/) was the main source of bibliography during this evaluation. General Policies and Organization of Material: see http://www.nndc.bnl.gov/nds/NDSPolicies.pdf. Acknowledgments: This evaluation is benefited from earlier evaluations by R. B. Firestone (2005Fi16) and P. M. E n d t ( 1 9 9 8 E n 0 4 , 1 9 9 0 E n 0 8 , 1 9 7 8 E n 0 2 ) . E v a l u a t o r i s t h a n k f u l t o t h e c o m p i l e r s o f X U N D L d a t a s e t s f o r i n i t i a l e n t r y f r o m r e f e r e n c e s ( c o m p i l e r s ) : 2 0 0 4 C o (MacMaster) and 2009Ma68 (K. Abusaleem (U. of Jordan) and B. Singh ( M c M a s t e r ) ) . A l s o t h e e v a l u a t o r i s g r a t e f u l t o t h e r e v i e w e r f o r c o n s t r u c t i v e c o m m e n t s a n d s u g g e s t i o n s a n d also thankful to E.A. McCutchan for a thorough editorial review.

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Properties of levels in22Ne

Abstract: Levels up to 9.3 MeV excitation in 22Ne were studied with the 19F(c~, p~/) 22Ne reaction at E~ = 12 MeV. Level energies, branching ratios, mean lifetimes, spins and mixing ratios were obtained for a number of levels.Relevant results are compared with many-particle shellmodel calculations.

Cited by 11 publications

References 33 publications

Proton-decaying states inMg22and the nucleosynthesis ofNa22<

Proton-decaying states inMg22and the nucleosynthesis ofNa22<

Nuclear Data Sheets for

Nuclear Data Sheets for A = 22

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