Measurement of the 24Mg(p, t)22Mg reaction for the states near the 21Na + p threshold

Michimasa, S.; Kubono, S.; Park, S.H.; Teranishi, Takashi; Yanagisawa, Y.; Imai, N.; Fülöp, Zs.; Liu, X.; Minemura, T.; Yun, C. C.; D’Auria, J.M.; Jackson, K. P.

doi:10.1140/epja/i2002-10024-x

Cited by 22 publications

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“…Its angular distribution was compared with DWBA calculations and found to be consistent with a 0 + assignment. In the recent (p, t) measurements at 38 MeV [12] and 35 MeV [14], the 6.046 MeV state was found to be populated about ten times more strongly than the 5.962 MeV state. Those measurements covered center-of-mass angles larger than about 10…”

Section: Resonance Strengthsmentioning

confidence: 93%

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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: Resonance Strengthsmentioning

confidence: 93%

“…Most importantly, the angular distributions of Refs. [14,25] do not cover the small angles at which L = 0 transitions are most readily identified. In contrast, the present (p, t) data taken at 0…”

Section: Resonance Strengthsmentioning

confidence: 99%

Proton-decaying states inMg22and the nucleosynthesis ofNa22<

et al. 2003

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“…Thus, measurement of the maximum thick target yield can determine the resonance strength, !. Figure 2 shows the 22 Mg level scheme [12,13]. Calculation of the Gamow window indicates that the 212 keV, ' 0 resonance will be the dominant contributor (as compared to other higher resonances and direct capture) to the 21 Nap; 22 Mg reaction at all nova temperatures from 0.2 to 0.35 GK.…”

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confidence: 99%

“…The22 Mg level scheme of those states of astrophysical interest for ONe nova, shown with solid lines[12,13]. The numbers on the far left denote center-of-mass energies (E x -Q) in units of keV.…”

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confidence: 99%

Na21(p,γ)Mg
S¹,
Re²,
Buchmann³
et al. 2003
Phys. Rev. Lett.
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The 21Na(p,gamma)22Mg reaction is expected to play an important role in the nucleosynthesis of 22Na in oxygen-neon novae. The decay of 22Na leads to the emission of a characteristic 1.275 MeV gamma-ray line. This report provides the first direct measurement of the rate of this reaction using a radioactive 21Na beam, and discusses its astrophysical implications. The energy of the important state was measured to be E(c.m.)=205.7+/-0.5 keV with a resonance strength omegagamma=1.03+/-0.16(stat)+/-0.14(sys) meV.

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“…The excited states in 22 Mg have been investigated via many reactions; the 24 Mg(p, t) 22 Mg [3][4][5][6], 24 Mg( 4 He, 6 He) [7] and 12 C( 16 O, 6 He) reactions [8], which preferentially populate the natural-parity states in 22 Mg; the 25 Mg( 3 He, 6 He) reaction [9] which populates both the natural-parity and unnatural-parity states; the a Present address: School of Physics, University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ, UK; e-mail:…”

Section: Introductionmentioning

confidence: 99%

A study of the proton resonant property in 22Mg by elastic scattering of 21Na + p and its astrophysical implication in the 18Ne(α, p)21Na reaction rate

Kubono

Teranishi

et al. 2008

Eur. Phys. J. A

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Abstract. Proton resonances in22 Mg have been investigated by the resonant elastic scattering of 21 Na + p. The 21 Na beam with a mean energy of 4.00 MeV/nucleon was separated by the CNS radioactive-ion-beam separator (CRIB) and bombarded a thick (CH2)n target. The energy spectra of recoiled protons were measured at scattering angles of θc.m. ≈ 172• , 146• , respectively. Several excited states observed before have been confirmed including two states (at 6.616, 6.796 MeV) observed at TRIUMF. A new state at 7.06 MeV has been observed, and another new one at 7.28 MeV is tentatively identified due to its low statistics. The proton resonant parameters were deduced from an R-matrix analysis of the differential crosssection data with a SAMMY-M6-BETA code. The astrophysical implication for the 18 Ne(α, p) 21 Na reaction has been briefly discussed.PACS. 25.60.-t Reaction induced by unstable nuclei -23.50.+z Decay by proton emission -26.50.+x Nuclear physics aspects of novae, supernovae, and other explosive environments

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Measurement of the 24Mg(p, t)22Mg reaction for the states near the 21Na + p threshold

Cited by 22 publications

References 0 publications

Proton-decaying states inMg22and the nucleosynthesis ofNa22<

Proton-decaying states inMg22and the nucleosynthesis ofNa22<

Na21(p,γ)Mg
S¹,
Re²,
Buchmann³
et al. 2003
Phys. Rev. Lett.
Self Cite
99
0
19
0
1
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A study of the proton resonant property in 22Mg by elastic scattering of 21Na + p and its astrophysical implication in the 18Ne(α, p)21Na reaction rate

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Measurement of the 24Mg(p, t)22Mg reaction for the states near the 21Na + p threshold

Cited by 22 publications

References 0 publications

Proton-decaying states inMg22and the nucleosynthesis ofNa22<

Proton-decaying states inMg22and the nucleosynthesis ofNa22<

Na21(p,γ)MgS1, Re2, Buchmann3 et al. 2003Phys. Rev. Lett.Self Cite9901901View full textAdd to dashboardCite

A study of the proton resonant property in 22Mg by elastic scattering of 21Na + p and its astrophysical implication in the 18Ne(α, p)21Na reaction rate

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Na21(p,γ)Mg
S¹,
Re²,
Buchmann³
et al. 2003
Phys. Rev. Lett.
Self Cite
99
0
19
0
1
View full text Add to dashboard Cite