Experimental study of resonant states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>27</mml:mn></mml:msup></mml:math>P via elastic scattering of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>26</mml:mn></mml:msup></mml:math>Si<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:mrow></mml:math>

Jung, H. S.; Lee, C. S.; Kwon, Y. K.; Moon, J. Y.; Lee, J. H.; Yun, C. C.; Kubono, S.; Yamaguchi, H.; Hashimoto, Takashi; Kahl, D.; Hayakawa, S.; Choi, S.; Kim, M. J.; Kim, Y. H.; Kim, Y. K.; Park, J. S.; Kim, E. J.; Moon, C. B.; Teranishi, Takashi; Wakabayashi, Y.; Iwasa, N.; Yamada, Teiko; Togano, Y.; Kato, S.; Cherubini, S.; Rapisarda, G. G.

doi:10.1103/physrevc.85.045802

Cited by 23 publications

(15 citation statements)

References 37 publications

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“…1, which is quite similar to that used in Ref. [49]. The beam purity was about 98% after the Wien-filter.…”

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confidence: 78%

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Examination of the role of theO14(α,p)F17reac

Parikh

et al. 2014

Phys. Rev. C

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The 14 O(α,p) 17 F reaction is one of the key reactions involved in the breakout from the hot-CNO cycle to the rp-process in type-I x-ray bursts (XRBs). The resonant properties in the compound nucleus 18 Ne have been investigated through resonant elastic scattering of 17 F+p. The radioactive 17 F beam was separated by the Center for Nuclear Study radioactive ion beam separator (CRIB) and bombarded a thick H 2 gas target at 3.6 MeV/nucleon. The recoiling light particles were measured by three E-E silicon telescopes at laboratory angles of θ lab ≈3 • , 10 • , and 18 • . Five resonances at E x = 6.15, 6.28, 6.35, 6.85, and 7.05 MeV were observed in the excitation functions, and their spin-parities have been determined based on an R-matrix analysis. In particular, J π = 1 − was firmly assigned to the 6.15-MeV state which dominates the thermonuclear 14 O(α,p) 17 F rate below 2 GK. As well, a possible new excited state in 18 Ne was observed at E x = 6.85 ± 0.11 MeV with tentative J = 0 assignment. This state could be the analog state of the 6.880 MeV (0 − ) level in the mirror nucleus 18 O, or a bandhead state (0 + ) of the six-particle four-hole (6p-4h) band. A new thermonuclear 14 O(α,p) 17 F rate has been determined, and the astrophysical impact of multiple recent rates has been examined using an XRB model. Contrary to previous expectations, we find only a modest impact on predicted nuclear energy generation rates from using reaction rates differing by up to several orders of magnitude.

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“…1, which is quite similar to that used in Ref. [49]. The beam purity was about 98% after the Wien-filter.…”

mentioning

confidence: 78%

“…The thick target method [41][42][43][44][45], proven to be successful in our previous studies [46][47][48][49], was used in this experiment. In particular, we have 17 F rates within the framework of one-zone XRB postprocessing calculations.…”

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confidence: 99%

Examination of the role of theO14(α,p)F17reac

Parikh

et al. 2014

Phys. Rev. C

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“…2 ) fm, where A 1 and A 2 are the mass numbers of the two species in channel i; an identical parametrization was used in the studies of 21 Na+α [58] and 26 Si+p [44], which are two of the most similar experiments to the present work. For consistency, the same α-channel radius was also used in the R-Matrix calculation.…”

Section: R-matrix Analysismentioning

confidence: 99%

First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
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Background: Type I x-ray bursts are the most frequently observed thermonuclear explosions in the galaxy, resulting from thermonuclear runaway on the surface of an accreting neutron star. The 30 S(α, p) reaction plays a critical role in burst models, yet insufficient experimental information is available to calculate a reliable, precise rate for this reaction.Purpose: Our measurement was conducted to search for states in 34 Ar and determine their quantum properties. In particular, natural-parity states with large α-decay partial widths should dominate the stellar reaction rate.Method: We performed the first measurement of 30 S+α resonant elastic scattering up to a center-of-mass energy of 5.5 MeV using a radioactive ion beam. The experiment utilized a thick gaseous active target system and silicon detector array in inverse kinematics. Results:We obtained an excitation function for 30 S(α, α) near 150• in the center-of-mass frame. The experimental data were analyzed with R-Matrix calculations, and we observed three new resonant patterns between 11.1 and 12.1 MeV, extracting their properties of resonance energy, widths, spin, and parity. Conclusions:We calculated the resonant thermonuclear reaction rate of 30 S(α, p) based on all available experimental data of 34 Ar and found an upper limit about one order of magnitude larger than a rate determined using a statistical model. The astrophysical impact of these two rates has been investigated through one-zone postprocessing type I x-ray burst calculations. We find that our new upper limit for the 30 S(α, p) 33 Cl rate significantly affects the predicted nuclear energy generation rate during the burst.

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“…By making use of charge-exchange or transfer reactions, CRIB can deliver intense, low-energy secondary beams for low-and medium-mass nuclei. Most of the produced radioactive ion beams have been used for resonant scattering experiments via the thick-target method [30,[33][34][35][36][37][38], as is adopted in the present work.…”

Section: A Production Of the 22 Na Secondary Beammentioning

confidence: 99%

“…In this regard, the 22 Na + p entrance channel plus resonant scattering with the thick-target inverse kinematics method [29] is sensitive to populate the relevant resonances in 23 Mg. In this work, we study proton resonant states in 23 Mg by using the 22 Na + p resonant scattering, with a setup similar to our recent 26 Si + p measurement [30]. The 22 Na(p, γ ) 23 Mg reaction rate is reevaluated by using both presently available and our new experimental data.…”

Section: Introductionmentioning

confidence: 99%

Resonant scattering of22Na + pstudied by the thick-target inverse-kinematic method

Jin

Wang

et al. 2013

Phys. Rev. C

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Background: In presolar low-density graphite grains, an extraordinarily large 22 Ne/ 20 Ne ratio or even nearly pure 22 Ne is found, pointing to the condensation of radioactive 22 Na in grains. Supernovae and neon-rich novae are the main events that produce 22 Na via the explosive hydrogen burning process. The 22 Na(p, γ) 23 Mg reaction is one of the key reactions that influences the 22 Na abundance in ejecta. Purpose:The present work aims to explore the proton resonant states in 23 Mg relevant to the astrophysical 22 Na(p, γ) 23 Mg reaction. The determined 23 Mg resonant parameters can be used to evaluate the 22 Na(p, γ) 23 Mg reaction rate. Method:A low-energy 22 Na radioactive ion beam is produced via the 1 H(22 Ne, 22 Na)n reaction, and used to measure the experimental excitation function of the 22 Na + p resonant scattering with a conventional thick-target inverse kinematic method. R-matrix analysis is applied to deduce the 23 Mg resonance parameters from the experimental excitation function. Results: Three proton resonance states in 23 Mg are observed. Spins/parities and the proton partial widths are determined. The deduced excitation energies agree with the compiled values. Conclusions: The new spin and parity assignments allow us to perform a shell-model calculation of the γ widths of the 23 Mg resonant states for the evaluation of the 22 Na(p, γ) 23 Mg astrophysical reaction rate. The two s-wave resonant states established in this work at 8.793 and 8.916 MeV in 23 Mg, respectively, increase the total reaction rate by about 5% at a temperature greater than 2 GK.

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Experimental study of resonant states in27P via elastic scattering of26Si+p

Cited by 23 publications

References 37 publications

Examination of the role of theO14(α,p)F17reac

Examination of the role of theO14(α,p)F17reac

First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
Self Cite
14
0
10
0
View full text Add to dashboard Cite

Resonant scattering of22Na + pstudied by the thick-target inverse-kinematic method

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Experimental study of resonant states in27P via elastic scattering of26Si+p

Cited by 23 publications

References 37 publications

Examination of the role of theO14(α,p)F17reac

Examination of the role of theO14(α,p)F17reac

First measurement of S30+α resonant elastic scattering for the S30Kahl1, Yamaguchi2, Kubono3 et al. 2018Phys. Rev. CSelf Cite140100View full textAdd to dashboardCite

Resonant scattering of22Na + pstudied by the thick-target inverse-kinematic method

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First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
Self Cite
14
0
10
0
View full text Add to dashboard Cite