Evidence for 15O + α resonance structures in 19Ne via direct measurement

Domenico Torresi; Carl Wheldon; Tzanka Kokalova Wheldon; Sam Bailey; A. Boiano; C. Boiano; M. Fisichella; M. Mazzocco; C. Parascandolo; D. Pierroutsakou; E. Strano; M. Zadro; M. Cavallaro; S. Cherubini; Neil Curtis; A. Di Pietro; J. P. Fernández Garcia; P. Figuera; T. Glodariu; J. Grbosz; M. La Cognata; M. La Commara; M. Lattuada; D. Mengoni; R. G. Pizzone; C. Signorini; C. Stefanini; L. Stroe; C. Spitaleri

doi:10.1103/PhysRevC.96.044317

Evidence for ¹⁵O + α resonance structures in ¹⁹Ne via direct measurement

Domenico Torresi, Carl Wheldon, Tzanka Kokalova Wheldon, Sam Bailey, A. Boiano, C. Boiano, M. Fisichella, M. Mazzocco, C. Parascandolo, D. Pierroutsakou, E. Strano, M. Zadro, M. Cavallaro, S. Cherubini, Neil Curtis, A. Di Pietro, J. P. Fernández Garcia, P. Figuera, T. Glodariu, J. GrboszM. La Cognata, M. La Commara, M. Lattuada, D. Mengoni, R. G. Pizzone, C. Signorini, C. Stefanini, L. Stroe, C. Spitaleri

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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218 Downloads (Pure)

Abstract

States in the astrophysically important ¹⁹Ne nucleus have been populated directly using the ¹⁵O(α,α)¹⁵O reaction with a radioactive ¹⁵O beam. Due to the challenges involved, this represents the first such ¹⁵O measurement with high resolution and the first dedicated to exploring the cluster structure. This measurement comprises three experiments: the first to develop the ¹⁵O radioactive beam, the second the resonant scattering study, and the third to measure the precise energy loss of O ions in ⁴He to reduce systematic uncertainties. The results show evidence for ¹⁵O+α cluster structure which could explain earlier results pointing to the increased α branching ratio in the astrophysical reaction rate for high-spin near-threshold resonances. Absolute differential cross sections have been measured. Additionally, spins, parities, and partial decay widths, essential for nuclear reaction-rate calculations, have been extracted using an R-matrix analysis.

Original language	English
Article number	044317
Journal	Physical Review C
Volume	96
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.96.044317
Publication status	Published - 18 Oct 2017

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Torresi_et_al_Evidence_for_15O_+_α_resonance_structures_Physical_Review_C_2017
Published in Physical Review C on 18/10/2017 DOI: 10.1103/PhysRevC.96.044317
Accepted author manuscript, 2.26 MBLicence: None: All rights reserved

Cite this

Torresi, D., Wheldon, C., Kokalova Wheldon, T., Bailey, S., Boiano, A., Boiano, C., Fisichella, M., Mazzocco, M., Parascandolo, C., Pierroutsakou, D., Strano, E., Zadro, M., Cavallaro, M., Cherubini, S., Curtis, N., Di Pietro, A., Fernández Garcia, J. P., Figuera, P., Glodariu, T., ... Spitaleri, C. (2017). Evidence for ¹⁵O + α resonance structures in ¹⁹Ne via direct measurement. Physical Review C, 96(4), Article 044317. https://doi.org/10.1103/PhysRevC.96.044317

@article{fe0307b350b64985a595aae629e78b39,

title = "Evidence for 15O + α resonance structures in 19Ne via direct measurement",

abstract = "States in the astrophysically important 19Ne nucleus have been populated directly using the 15O(α,α)15O reaction with a radioactive 15O beam. Due to the challenges involved, this represents the first such 15O measurement with high resolution and the first dedicated to exploring the cluster structure. This measurement comprises three experiments: the first to develop the 15O radioactive beam, the second the resonant scattering study, and the third to measure the precise energy loss of O ions in 4He to reduce systematic uncertainties. The results show evidence for 15O+α cluster structure which could explain earlier results pointing to the increased α branching ratio in the astrophysical reaction rate for high-spin near-threshold resonances. Absolute differential cross sections have been measured. Additionally, spins, parities, and partial decay widths, essential for nuclear reaction-rate calculations, have been extracted using an R-matrix analysis.",

author = "Domenico Torresi and Carl Wheldon and {Kokalova Wheldon}, Tzanka and Sam Bailey and A. Boiano and C. Boiano and M. Fisichella and M. Mazzocco and C. Parascandolo and D. Pierroutsakou and E. Strano and M. Zadro and M. Cavallaro and S. Cherubini and Neil Curtis and {Di Pietro}, A. and {Fern{\'a}ndez Garcia}, {J. P.} and P. Figuera and T. Glodariu and J. Grbosz and {La Cognata}, M. and {La Commara}, M. and M. Lattuada and D. Mengoni and Pizzone, {R. G.} and C. Signorini and C. Stefanini and L. Stroe and C. Spitaleri",

year = "2017",

month = oct,

day = "18",

doi = "10.1103/PhysRevC.96.044317",

language = "English",

volume = "96",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society (APS)",

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Torresi, D, Wheldon, C , Kokalova Wheldon, T, Bailey, S, Boiano, A, Boiano, C, Fisichella, M, Mazzocco, M, Parascandolo, C, Pierroutsakou, D, Strano, E, Zadro, M, Cavallaro, M, Cherubini, S, Curtis, N, Di Pietro, A, Fernández Garcia, JP, Figuera, P, Glodariu, T, Grbosz, J, La Cognata, M, La Commara, M, Lattuada, M, Mengoni, D, Pizzone, RG, Signorini, C, Stefanini, C, Stroe, L & Spitaleri, C 2017, 'Evidence for ¹⁵O + α resonance structures in ¹⁹Ne via direct measurement', Physical Review C, vol. 96, no. 4, 044317. https://doi.org/10.1103/PhysRevC.96.044317

TY - JOUR

T1 - Evidence for 15O + α resonance structures in 19Ne via direct measurement

AU - Torresi, Domenico

AU - Wheldon, Carl

AU - Kokalova Wheldon, Tzanka

AU - Bailey, Sam

AU - Boiano, A.

AU - Boiano, C.

AU - Fisichella, M.

AU - Mazzocco, M.

AU - Parascandolo, C.

AU - Pierroutsakou, D.

AU - Strano, E.

AU - Zadro, M.

AU - Cavallaro, M.

AU - Cherubini, S.

AU - Curtis, Neil

AU - Di Pietro, A.

AU - Fernández Garcia, J. P.

AU - Figuera, P.

AU - Glodariu, T.

AU - Grbosz, J.

AU - La Cognata, M.

AU - La Commara, M.

AU - Lattuada, M.

AU - Mengoni, D.

AU - Pizzone, R. G.

AU - Signorini, C.

AU - Stefanini, C.

AU - Stroe, L.

AU - Spitaleri, C.

PY - 2017/10/18

Y1 - 2017/10/18

N2 - States in the astrophysically important 19Ne nucleus have been populated directly using the 15O(α,α)15O reaction with a radioactive 15O beam. Due to the challenges involved, this represents the first such 15O measurement with high resolution and the first dedicated to exploring the cluster structure. This measurement comprises three experiments: the first to develop the 15O radioactive beam, the second the resonant scattering study, and the third to measure the precise energy loss of O ions in 4He to reduce systematic uncertainties. The results show evidence for 15O+α cluster structure which could explain earlier results pointing to the increased α branching ratio in the astrophysical reaction rate for high-spin near-threshold resonances. Absolute differential cross sections have been measured. Additionally, spins, parities, and partial decay widths, essential for nuclear reaction-rate calculations, have been extracted using an R-matrix analysis.

AB - States in the astrophysically important 19Ne nucleus have been populated directly using the 15O(α,α)15O reaction with a radioactive 15O beam. Due to the challenges involved, this represents the first such 15O measurement with high resolution and the first dedicated to exploring the cluster structure. This measurement comprises three experiments: the first to develop the 15O radioactive beam, the second the resonant scattering study, and the third to measure the precise energy loss of O ions in 4He to reduce systematic uncertainties. The results show evidence for 15O+α cluster structure which could explain earlier results pointing to the increased α branching ratio in the astrophysical reaction rate for high-spin near-threshold resonances. Absolute differential cross sections have been measured. Additionally, spins, parities, and partial decay widths, essential for nuclear reaction-rate calculations, have been extracted using an R-matrix analysis.

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U2 - 10.1103/PhysRevC.96.044317

DO - 10.1103/PhysRevC.96.044317

M3 - Article

AN - SCOPUS:85032021194

SN - 2469-9985

VL - 96

JO - Physical Review C

JF - Physical Review C

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