α -unbound levels in Ar 34 from Ar 36 (p,t) Ar 34 reaction measurements and implications for the astrophysical S 30 (α,p) Cl 33 reaction rate

A. M. Long; T. Adachi; M. Beard; G. P.A. Berg; M. Couder; R. J. Deboer; M. Dozono; J. Görres; H. Fujita; Y. Fujita; K. Hatanaka; D. Ishikawa; T. Kubo; H. Matsubara; Y. Namiki; S. O'Brien; Y. Ohkuma; H. Okamura; H. J. Ong; D. Patel; Y. Sakemi; Y. Shimbara; S. Suzuki; R. Talwar; A. Tamii; A. Volya; T. Wakasa; R. Watanabe; M. Wiescher; R. Yamada; J. Zenihiro

doi:10.1103/PhysRevC.97.054613

α -unbound levels in Ar 34 from Ar 36 (p,t) Ar 34 reaction measurements and implications for the astrophysical S 30 (α,p) Cl 33 reaction rate

A. M. Long, T. Adachi, M. Beard, G. P.A. Berg, M. Couder, R. J. Deboer, M. Dozono, J. Görres, H. Fujita, Y. Fujita, K. Hatanaka, D. Ishikawa, T. Kubo, H. Matsubara, Y. Namiki, S. O'Brien, Y. Ohkuma, H. Okamura, H. J. Ong, D. PatelY. Sakemi, Y. Shimbara, S. Suzuki, R. Talwar, A. Tamii, A. Volya, T. Wakasa, R. Watanabe, M. Wiescher, R. Yamada, J. Zenihiro

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Abstract

The S30(α,p)Cl33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the αp process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the S30(α,p) Cl33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar36(p,t)Ar34 measurements in order to identify levels in Ar34 that could appear as resonances in the S30(α,p)Cl33 reaction. Energies of levels identified in this work, along with model-based assumptions for spin assignments and spectroscopic factors, were then used to determine a rate for the S30(α,p)Cl33 reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model predictions over a range of XRB temperatures.

Original language	English (US)
Article number	054613
Journal	Physical Review C
Volume	97
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.97.054613
State	Published - May 22 2018
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Long, A. M., Adachi, T., Beard, M., Berg, G. P. A., Couder, M., Deboer, R. J., Dozono, M., Görres, J., Fujita, H., Fujita, Y., Hatanaka, K., Ishikawa, D., Kubo, T., Matsubara, H., Namiki, Y., O'Brien, S., Ohkuma, Y., Okamura, H., Ong, H. J., ... Zenihiro, J. (2018). α -unbound levels in Ar 34 from Ar 36 (p,t) Ar 34 reaction measurements and implications for the astrophysical S 30 (α,p) Cl 33 reaction rate. Physical Review C, 97(5), Article 054613. https://doi.org/10.1103/PhysRevC.97.054613

Long, AM, Adachi, T, Beard, M, Berg, GPA, Couder, M, Deboer, RJ, Dozono, M, Görres, J, Fujita, H, Fujita, Y, Hatanaka, K, Ishikawa, D, Kubo, T, Matsubara, H, Namiki, Y, O'Brien, S, Ohkuma, Y, Okamura, H, Ong, HJ, Patel, D, Sakemi, Y, Shimbara, Y, Suzuki, S, Talwar, R, Tamii, A, Volya, A, Wakasa, T, Watanabe, R, Wiescher, M, Yamada, R & Zenihiro, J 2018, 'α -unbound levels in Ar 34 from Ar 36 (p,t) Ar 34 reaction measurements and implications for the astrophysical S 30 (α,p) Cl 33 reaction rate', Physical Review C, vol. 97, no. 5, 054613. https://doi.org/10.1103/PhysRevC.97.054613

@article{41b8bf59e8724ba08a370088c9abc58d,

title = "α -unbound levels in Ar 34 from Ar 36 (p,t) Ar 34 reaction measurements and implications for the astrophysical S 30 (α,p) Cl 33 reaction rate",

abstract = "The S30(α,p)Cl33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the αp process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the S30(α,p) Cl33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar36(p,t)Ar34 measurements in order to identify levels in Ar34 that could appear as resonances in the S30(α,p)Cl33 reaction. Energies of levels identified in this work, along with model-based assumptions for spin assignments and spectroscopic factors, were then used to determine a rate for the S30(α,p)Cl33 reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model predictions over a range of XRB temperatures.",

author = "Long, {A. M.} and T. Adachi and M. Beard and Berg, {G. P.A.} and M. Couder and Deboer, {R. J.} and M. Dozono and J. G{\"o}rres and H. Fujita and Y. Fujita and K. Hatanaka and D. Ishikawa and T. Kubo and H. Matsubara and Y. Namiki and S. O'Brien and Y. Ohkuma and H. Okamura and Ong, {H. J.} and D. Patel and Y. Sakemi and Y. Shimbara and S. Suzuki and R. Talwar and A. Tamii and A. Volya and T. Wakasa and R. Watanabe and M. Wiescher and R. Yamada and J. Zenihiro",

note = "Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

year = "2018",

month = may,

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doi = "10.1103/PhysRevC.97.054613",

language = "English (US)",

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AU - Long, A. M.

AU - Adachi, T.

AU - Beard, M.

AU - Berg, G. P.A.

AU - Couder, M.

AU - Deboer, R. J.

AU - Dozono, M.

AU - Görres, J.

AU - Fujita, H.

AU - Fujita, Y.

AU - Hatanaka, K.

AU - Ishikawa, D.

AU - Kubo, T.

AU - Matsubara, H.

AU - Namiki, Y.

AU - O'Brien, S.

AU - Ohkuma, Y.

AU - Okamura, H.

AU - Ong, H. J.

AU - Patel, D.

AU - Sakemi, Y.

AU - Shimbara, Y.

AU - Suzuki, S.

AU - Talwar, R.

AU - Tamii, A.

AU - Volya, A.

AU - Wakasa, T.

AU - Watanabe, R.

AU - Wiescher, M.

AU - Yamada, R.

AU - Zenihiro, J.

PY - 2018/5/22

Y1 - 2018/5/22

N2 - The S30(α,p)Cl33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the αp process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the S30(α,p) Cl33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar36(p,t)Ar34 measurements in order to identify levels in Ar34 that could appear as resonances in the S30(α,p)Cl33 reaction. Energies of levels identified in this work, along with model-based assumptions for spin assignments and spectroscopic factors, were then used to determine a rate for the S30(α,p)Cl33 reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model predictions over a range of XRB temperatures.

AB - The S30(α,p)Cl33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the αp process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the S30(α,p) Cl33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar36(p,t)Ar34 measurements in order to identify levels in Ar34 that could appear as resonances in the S30(α,p)Cl33 reaction. Energies of levels identified in this work, along with model-based assumptions for spin assignments and spectroscopic factors, were then used to determine a rate for the S30(α,p)Cl33 reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model predictions over a range of XRB temperatures.

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α -unbound levels in Ar 34 from Ar 36 (p,t) Ar 34 reaction measurements and implications for the astrophysical S 30 (α,p) Cl 33 reaction rate

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