A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production

Taggart, M. P.; Akers, C.; Laird, A. M.; Hager, U.; Ruiz, C.; Hutcheon, D. A.; Bentley, M. A.; Brown, J. R.; Buchmann, L.; Chen, A. A.; Chen, J.; Chipps, K. A.; Choplin, A.; D'Auria, J. M.; Davids, B.; Davis, C.; Diget, C. Aa.; Erikson, L.; Fallis, J.; Fox, S. P.; Frischknecht, U.; Fulton, B. R.; Galinski, N.; Greife, U.; Hirschi, R.; Howell, D.; Martin, L.; Mountford, D.; Murphy, A. St. J.; Ottewell, D.; Pignatari, M.; Reeve, S.; Ruprecht, G.; Sjue, S.; Veloce, L.; Williams, M.

doi:10.1016/j.physletb.2019.134894

Title: A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production

Abstract

During the slow neutron capture process in massive stars, reactions on light elements can both produce and absorb neutrons thereby influencing the final heavy element abundances. At low metallicities, the high neutron capture rate of ¹⁶O can inhibit s-process nucleosynthesis unless the neutrons are recycled via the ¹⁷O(α, n)²⁰Ne reaction. The efficiency of this neutron recycling is determined by competition between the ¹⁷O(α, n)²⁰Ne and ¹⁷O(α, γ)²¹Ne reactions. While some experimental data are available on the former reaction, no data exist for the radiative capture channel at the relevant astrophysical energies. The ¹⁷O(α, γ)²¹Ne reaction has been studied directly using the DRAGON recoil separator at the TRIUMF Laboratory. The reaction cross section has been determined at energies between 0.6 and 1.6 MeV Ecm, reaching into the Gamow window for core helium burning for the first time. Resonance strengths for resonances at 0.63, 0.721, 0.81 and 1.122 MeV Ecmhave been extracted. The experimentally based reaction rate calculated represents a lower limit, but suggests that significant s-process nucleosynthesis occurs in low metallicity massive stars.

Authors:

; Akers, C.;

; Hager, U.; Ruiz, C.; Hutcheon, D. A.; Bentley, M. A.; Brown, J. R.; Buchmann, L.; Chen, A. A.; Chen, J.;

; Choplin, A.; D'Auria, J. M.; Davids, B.; Davis, C.; Diget, C. Aa.; Erikson, L.; Fallis, J.; Fox, S. P. more »

Publication Date:: Fri Nov 01 00:00:00 EDT 2019

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE; National Science Foundation (NSF)

Contributing Org.:: NuGrid Collaboration

OSTI Identifier:: 1559356

Alternate Identifier(s):: OSTI ID: 1566949

Grant/Contract Number:: AC05-00OR22725; FG02-93ER40789

Resource Type:: Published Article

Journal Name:: Physics Letters. B

Additional Journal Information:: Journal Name: Physics Letters. B Journal Volume: 798 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats


                    Taggart, M. P., Akers, C., Laird, A. M., Hager, U., Ruiz, C., Hutcheon, D. A., Bentley, M. A., Brown, J. R., Buchmann, L., Chen, A. A., Chen, J., Chipps, K. A., Choplin, A., D'Auria, J. M., Davids, B., Davis, C., Diget, C. Aa., Erikson, L., Fallis, J., Fox, S. P., Frischknecht, U., Fulton, B. R., Galinski, N., Greife, U., Hirschi, R., Howell, D., Martin, L., Mountford, D., Murphy, A. St. J., Ottewell, D., Pignatari, M., Reeve, S., Ruprecht, G., Sjue, S., Veloce, L., and Williams, M. A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production.  Netherlands: N. p., 2019. 
Web.  doi:10.1016/j.physletb.2019.134894.

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                    Taggart, M. P., Akers, C., Laird, A. M., Hager, U., Ruiz, C., Hutcheon, D. A., Bentley, M. A., Brown, J. R., Buchmann, L., Chen, A. A., Chen, J., Chipps, K. A., Choplin, A., D'Auria, J. M., Davids, B., Davis, C., Diget, C. Aa., Erikson, L., Fallis, J., Fox, S. P., Frischknecht, U., Fulton, B. R., Galinski, N., Greife, U., Hirschi, R., Howell, D., Martin, L., Mountford, D., Murphy, A. St. J., Ottewell, D., Pignatari, M., Reeve, S., Ruprecht, G., Sjue, S., Veloce, L., & Williams, M. A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production.  Netherlands.  https://doi.org/10.1016/j.physletb.2019.134894

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                    Taggart, M. P., Akers, C., Laird, A. M., Hager, U., Ruiz, C., Hutcheon, D. A., Bentley, M. A., Brown, J. R., Buchmann, L., Chen, A. A., Chen, J., Chipps, K. A., Choplin, A., D'Auria, J. M., Davids, B., Davis, C., Diget, C. Aa., Erikson, L., Fallis, J., Fox, S. P., Frischknecht, U., Fulton, B. R., Galinski, N., Greife, U., Hirschi, R., Howell, D., Martin, L., Mountford, D., Murphy, A. St. J., Ottewell, D., Pignatari, M., Reeve, S., Ruprecht, G., Sjue, S., Veloce, L., and Williams, M. Fri .  
"A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production".  Netherlands.  https://doi.org/10.1016/j.physletb.2019.134894.

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@article{osti_1559356,

  title        = {A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production},

  author       = {Taggart, M. P. and Akers, C. and Laird, A. M. and Hager, U. and Ruiz, C. and Hutcheon, D. A. and Bentley, M. A. and Brown, J. R. and Buchmann, L. and Chen, A. A. and Chen, J. and Chipps, K. A. and Choplin, A. and D'Auria, J. M. and Davids, B. and Davis, C. and Diget, C. Aa. and Erikson, L. and Fallis, J. and Fox, S. P. and Frischknecht, U. and Fulton, B. R. and Galinski, N. and Greife, U. and Hirschi, R. and Howell, D. and Martin, L. and Mountford, D. and Murphy, A. St. J. and Ottewell, D. and Pignatari, M. and Reeve, S. and Ruprecht, G. and Sjue, S. and Veloce, L. and Williams, M.},

  abstractNote = {During the slow neutron capture process in massive stars, reactions on light elements can both produce and absorb neutrons thereby influencing the final heavy element abundances. At low metallicities, the high neutron capture rate of 16O can inhibit s-process nucleosynthesis unless the neutrons are recycled via the 17O(α, n)20Ne reaction. The efficiency of this neutron recycling is determined by competition between the 17O(α, n)20Ne and 17O(α, γ)21Ne reactions. While some experimental data are available on the former reaction, no data exist for the radiative capture channel at the relevant astrophysical energies. The 17O(α, γ)21Ne reaction has been studied directly using the DRAGON recoil separator at the TRIUMF Laboratory. The reaction cross section has been determined at energies between 0.6 and 1.6 MeV Ecm, reaching into the Gamow window for core helium burning for the first time. Resonance strengths for resonances at 0.63, 0.721, 0.81 and 1.122 MeV Ecmhave been extracted. The experimentally based reaction rate calculated represents a lower limit, but suggests that significant s-process nucleosynthesis occurs in low metallicity massive stars.},

  doi          = {10.1016/j.physletb.2019.134894},

  journal      = {Physics Letters. B},

  number       = C,

  volume       = 798,

  place        = {Netherlands},

  year         = {Fri Nov 01 00:00:00 EDT 2019},

  month        = {Fri Nov 01 00:00:00 EDT 2019}

}

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Figures / Tables:

Fig. 1: Part of ²¹Ne level scheme. The Gamow window for the ¹⁷O($α, γ$ )²¹Ne reaction during core helium burning in massive stars is indicated by the bar on the left and the bars on the right show the energy regions covered by the present work.

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Works referenced in this record:

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Non-standard s-process in low metallicity massive rotating stars
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Title: A direct measurement of the 17O(α,γ)21Ne reaction in inverse kinematics and its impact on heavy element production

Abstract

Citation Formats

Figures / Tables:

Non-standard s -process in massive rotating stars: Yields of 10–150 M ⊙ models at Z = 10 −3 journal, October 2018

Total Neutron Yield from the Reactions C 13 ( α , n ) O 16 and O 1 7 , 1 8 ( α , n ) Ne 2 0 , 2 1 journal, April 1973

Thermonuclear reaction rates V journal, November 1988

Calibration and simulation of a gamma array for DRAGON at ISAC journal, May 2003

Are some CEMP- s stars the daughters of spinstars? journal, November 2017

First direct measurement of resonance strengths in O 17 ( α , γ ) 21 Ne journal, May 2011

Imprints of fast-rotating massive stars in the Galactic Bulge journal, April 2011

Nuclear Data Sheets for A = 21 journal, July 2015

Microscopic three-cluster study of 21-nucleon systems journal, December 1993

Charge state studies of low energy heavy ions passing through hydrogen and helium gas journal, January 2003

Non-standard s-process in low metallicity massive rotating stars journal, January 2012

The (α, n) cross sections on 17O and 18O between 5 and 12.5 MeV journal, May 1967

The s process: Nuclear physics, stellar models, and observations journal, April 2011

The DRAGON facility for nuclear astrophysics at TRIUMF-ISAC: design, construction and operation journal, February 2003

Measurement of radiative capture resonance energies with an extended gas target journal, October 2012

The s -process in the Galactic halo: the fifth signature of spinstars in the early Universe? journal, April 2013

Improvements of the DRAGON recoil separator at ISAC journal, October 2008

Limits and confidence intervals in the presence of nuisance parameters journal, October 2005

Commissioning the DRAGON facility at ISAC journal, November 2005

Non-standard s -process in massive rotating stars: Yields of 10–150 M _⊙ models at Z = 10 ⁻³
journal, October 2018

Total Neutron Yield from the Reactions ${}^{13}C (α, n) {}^{16}O$ and ${}^{17, 18}O (α, n) {}^{20, 21}{Ne}$
journal, April 1973

Thermonuclear reaction rates V
journal, November 1988

Calibration and simulation of a gamma array for DRAGON at ISAC
journal, May 2003

Are some CEMP- s stars the daughters of spinstars?
journal, November 2017

First direct measurement of resonance strengths in ${}^{17}O$ $(α, γ)^{21}$ Ne
journal, May 2011

Imprints of fast-rotating massive stars in the Galactic Bulge
journal, April 2011

Nuclear Data Sheets for A = 21
journal, July 2015

Microscopic three-cluster study of 21-nucleon systems
journal, December 1993

Charge state studies of low energy heavy ions passing through hydrogen and helium gas
journal, January 2003

Non-standard s-process in low metallicity massive rotating stars
journal, January 2012

The (α, n) cross sections on 17O and 18O between 5 and 12.5 MeV
journal, May 1967

The $s$ process: Nuclear physics, stellar models, and observations
journal, April 2011

The DRAGON facility for nuclear astrophysics at TRIUMF-ISAC: design, construction and operation
journal, February 2003

Measurement of radiative capture resonance energies with an extended gas target
journal, October 2012

The s -process in the Galactic halo: the fifth signature of spinstars in the early Universe?
journal, April 2013

Improvements of the DRAGON recoil separator at ISAC
journal, October 2008

Limits and confidence intervals in the presence of nuisance parameters
journal, October 2005

Commissioning the DRAGON facility at ISAC
journal, November 2005