Direct measurement of the astrophysical reaction 14O(α,p)17F

Notani, M.; Kubono, S.; Teranishi, T.; Yanagisawa, Y.; Michimasa, S.; Ue, K.; He, Junyang; Iwasaki, Hirohide; Baba, H.; Tamaki, M.; Minemura, T.; Shimoura, S.; Hokoiwa, N.; Wakabayashi, Y.; Sasaki, Takashi; Fukuchi, Tetsuo; Odahara, A.; Gono, Y.; Fülöp, Zs.; Lee, E.K.; Hahn, K. I.; Moon, J. Y.; Yun, C. C.; Lee, J.H.; Lee, C.S.; Kato, S.

doi:10.1016/j.nuclphysa.2004.09.019

Cited by 27 publications

(31 citation statements)

References 10 publications

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“…Direct measurement of (α, p) reactions, such as 14 O(α, p) [19], 11 C(α, p) [20], 21 Na(α, p), 18 Ne(α, p), 30 S(α, p), and 22 Mg(α, p), have also been performed with the TTIK method using RI beams at CRIB. Several (α, p) reactions have been studied at CRIB.…”

Section: Direct Measurement Of (α P) Reactionsmentioning

confidence: 99%

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Experimental Studies of Light-Ion Nuclear Reactions Using Low-Energy RI Beams

Kahl¹,

Hayakawa²,

Sakaguchi³

et al. 2017

Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)

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CRIB (CNS Radio-Isotope Beam separator) is a low-energy RI beam separator of Center for Nuclear Study (CNS), the University of Tokyo. Studies on nuclear astrophysics, nuclear structure, and other interests have been performed using the RI beams at CRIB, forming international collaborations. A striking method to study astrophyiscal reactions involving radioactive nuclei is the thick-target method in inverse kinematics. Several astrophysical alpha-induced reactions have been be studied with that method at CRIB. A recent example is on the α resonant scattering with a radioactive 7 Be beam. This study is related to the astrophysical 7 Be(α,γ) reactions, important at hot p-p chain and νp-process in supernovae. There have been measurements based on several indirect methods, such as the asymptotic normalization coefficient (ANC) and Trojan horse method (THM). The first THM measurement using an RI beam has been performed at CRIB, to study the 18 F(p, α) 15 O reaction at astrophysical energies via the three body reaction 2 H( 18 F, α 15 O)n. The 18 F(p, α) 15 O reaction rate is crucial to understand the 511-keV γ-ray production in nova explosion phenomena, and we successfully evaluated the reaction cross section at novae temperature and below experimentally for the first time.

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Section: Direct Measurement Of (α P) Reactionsmentioning

confidence: 99%

“…The first measurement [22] may had problems in the identification of the resonances and the calculation of the cross section. Another measurement [23] reported considerable contribution of 2-proton decay events.…”

Section: Direct Measurement Of (α P) Reactionsmentioning

confidence: 99%

Experimental Studies of Light-Ion Nuclear Reactions Using Low-Energy RI Beams

Kahl¹,

Hayakawa²,

Sakaguchi³

et al. 2017

Proceedings of the 14th International Symposium on Nuclei in the Cosmos (NIC2016)

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“…This method has several advantages, namely, (a) using inverse kinematics, we can study reactions with short-lived RI which cannot be used as the target, (b) we can perform simultaneous measurements of cross section of various excitation energies without varying the incoming RI beam energy, and (c) we can perform measurements at 180 • in center-of-mass angle, where the Coulomb scattering is minimal. Many fruitful results have been obtained at CRIB with this method [5,6,7,8,9,10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Alpha resonant scattering for astrophysical reaction studies

Kahl

Nakao

Wakabayashi

et al. 2014

AIP Conference Proceedings

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Abstract. Several alpha-induced astrophysical reactions have been studied at CRIB (CNS Radioactive Ion Beam separator), which is a low-energy RI beam separator at Center for Nuclear Study (CNS) of the University of Tokyo. One of the methods to study them is the α resonant scattering using the thick-target method in inverse kinematics. Among the recent studies at CRIB, the measurement of 7 Be+α resonant scattering is discussed. Based on the result of the experiment, we evaluated the contributions of high-lying resonances for the 7 Be(α, γ) reaction, and proposed a new cluster band in 11 C.

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“…Constraining the proton-decay branches to the ground and first excited (E x = 495 keV, J π = 1/2 + ) states of 17 F is therefore of critical importance. Such inelastic channels were observed for several 18 Ne levels [20,29,32,37,39]; however, there are still some controversies [40].…”

mentioning

confidence: 99%

“…Although our understanding of this rate has been improved by indirect studies [20,[25][26][27][28][29][30][31], direct study [32], and time-reversal studies [33][34][35], most of the required resonance parameters (such as, J π and α ) have still not been sufficiently well determined.…”

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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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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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Direct measurement of the astrophysical reaction 14O(α,p)17F

Cited by 27 publications

References 10 publications

Experimental Studies of Light-Ion Nuclear Reactions Using Low-Energy RI Beams

Experimental Studies of Light-Ion Nuclear Reactions Using Low-Energy RI Beams

Alpha resonant scattering for astrophysical reaction studies

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

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