Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al

Kankainen, A.; Woods, P. J.; Doherty, D. T.; Albers, H. M.; Albers, M.; Ayangeakaa, A. D.; Carpenter, M. P.; Chiara, C. J.; Harker, J. L.; Janssens, R. V. F.; Lederer-Woods, C.; Seweryniak, D.; Strieder, F.; Zhu, S.

doi:10.1016/j.physletb.2020.136033

Title: Decay of the key 92-keV resonance in the ²⁵Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter ²⁶Al

Abstract

The 92-keV resonance in the ²⁵Mg(p,γ)²⁶Al reaction plays a key role in the production of ²⁶Al at astrophysical burning temperatures of ≈100 MK in the Mg-Al cycle. However, the state can decay to feed either the ground, ^26gAl, or isomeric state, ^26mAl. It is the ground state that is critical as the source of cosmic γ rays. It is therefore important to precisely determine the ground-state branching fraction f₀ of this resonance. Here we report on the identification of four γ-ray transitions from the 92-keV resonance, and determine the spin of the state and its ground-state branching fraction f₀ = 0.52(2)_stat(6)_syst. The f₀ value is the most precise reported to date, and at the lower end of the range of previously adopted values, implying a lower production rate of ^26gAl and its cosmic 1809-keV γ rays.

Authors:

; Woods, P. J.; Doherty, D. T.;

; Albers, M.; Ayangeakaa, A. D.; Carpenter, M. P.;

; Harker, J. L.; Janssens, R. V. F.; Lederer-Woods, C.; Seweryniak, D.; Strieder, F.;

Publication Date:: Mon Feb 01 00:00:00 EST 2021

Research Org.:: University of North Carolina, Chapel Hill, NC (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); STFC; European Union's Horizon 2020; Academy of Finland; Austrian Science Fund (FWF); European Union - Horizon 2020 Research and Innovation Programme

OSTI Identifier:: 1737722

Alternate Identifier(s):: OSTI ID: 1764027; OSTI ID: 1812740

Grant/Contract Number:: AC02-06CH11357; FG02-97ER41033; FG02-97ER41041; FG02-94ER40834; ST/J00006X/1; 771036; 275389

Resource Type:: Published Article

Journal Name:: Physics Letters. B

Additional Journal Information:: Journal Name: Physics Letters. B Journal Volume: 813 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear astrophysics; 26Al; γ spectroscopy; Cosmic γ rays

Citation Formats


                    Kankainen, A., Woods, P. J., Doherty, D. T., Albers, H. M., Albers, M., Ayangeakaa, A. D., Carpenter, M. P., Chiara, C. J., Harker, J. L., Janssens, R. V. F., Lederer-Woods, C., Seweryniak, D., Strieder, F., and Zhu, S. Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al.  Netherlands: N. p., 2021. 
Web.  doi:10.1016/j.physletb.2020.136033.

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                    Kankainen, A., Woods, P. J., Doherty, D. T., Albers, H. M., Albers, M., Ayangeakaa, A. D., Carpenter, M. P., Chiara, C. J., Harker, J. L., Janssens, R. V. F., Lederer-Woods, C., Seweryniak, D., Strieder, F., & Zhu, S. Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al.  Netherlands.  https://doi.org/10.1016/j.physletb.2020.136033

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                    Kankainen, A., Woods, P. J., Doherty, D. T., Albers, H. M., Albers, M., Ayangeakaa, A. D., Carpenter, M. P., Chiara, C. J., Harker, J. L., Janssens, R. V. F., Lederer-Woods, C., Seweryniak, D., Strieder, F., and Zhu, S. Mon .  
"Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al".  Netherlands.  https://doi.org/10.1016/j.physletb.2020.136033.

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@article{osti_1737722,

  title        = {Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al},

  author       = {Kankainen, A. and Woods, P. J. and Doherty, D. T. and Albers, H. M. and Albers, M. and Ayangeakaa, A. D. and Carpenter, M. P. and Chiara, C. J. and Harker, J. L. and Janssens, R. V. F. and Lederer-Woods, C. and Seweryniak, D. and Strieder, F. and Zhu, S.},

  abstractNote = {The 92-keV resonance in the 25Mg(p,γ)26Al reaction plays a key role in the production of 26Al at astrophysical burning temperatures of ≈100 MK in the Mg-Al cycle. However, the state can decay to feed either the ground, 26gAl, or isomeric state, 26mAl. It is the ground state that is critical as the source of cosmic γ rays. It is therefore important to precisely determine the ground-state branching fraction f0 of this resonance. Here we report on the identification of four γ-ray transitions from the 92-keV resonance, and determine the spin of the state and its ground-state branching fraction f0 = 0.52(2)stat(6)syst. The f0 value is the most precise reported to date, and at the lower end of the range of previously adopted values, implying a lower production rate of 26gAl and its cosmic 1809-keV γ rays.},

  doi          = {10.1016/j.physletb.2020.136033},

  journal      = {Physics Letters. B},

  number       = C,

  volume       = 813,

  place        = {Netherlands},

  year         = {Mon Feb 01 00:00:00 EST 2021},

  month        = {Mon Feb 01 00:00:00 EST 2021}

}

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Works referenced in this record:

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Structure of resonances in the Gamow burning window for the ${}^{25}{Al} (p, γ) {}^{26}{Si}$ reaction in novae
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Lifetimes of $^{26} Al$ and $^{34} Cl$ in an astrophysical plasma
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Coc, Alain; Porquet, Marie-Geneviève; Nowacki, Frédéric
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Title: Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al

Abstract

Citation Formats

Thermal Equilibration of 26 Al journal, August 2001

New estimates of the contribution of Wolf-Rayet stellar winds to the Galactic $\mathsf{^{26}}$Al journal, December 2004

New experimental study of low-energy ( p , γ ) resonances in magnesium isotopes journal, July 2010

Energy levels of A = 21–44 nuclei (VII) journal, December 1990

New Physics Opportunities at Gammasphere journal, January 1996

Carbon, nitrogen, magnesium, silicon, and titanium isotopic compositions of single interstellar silicon carbide grains from the Murchison carbonaceous chondrite journal, July 1994

The Nucleosynthesis of 26 Al and 60 Fe in Solar Metallicity Stars Extending in Mass from 11 to 120 M ⊙ : The Hydrostatic and Explosive Contributions journal, August 2006

Thermalization of long-lived nuclear isomeric states under stellar conditions journal, May 1980

Structure of resonances in the Gamow burning window for the Al 25 ( p , γ ) Si 26 reaction in novae journal, September 2015

The 25Mg(p, γ)26Al reaction at low astrophysical energies journal, January 2012

Lifetimes of 26 Al and 34 Cl in an astrophysical plasma journal, December 1999

The GAMMASPHERE journal, December 1990

Threshold states in 26Al revisited journal, March 1986

Threshold states in 26Al: (II). Extraction of resonance strengths journal, June 1983

Aluminum-26 in the early solar system - Fossil or fuel journal, January 1977

Radioactive 26Al from massive stars in the Galaxy journal, January 2006

Astrophysical aspects of the 25Mg(p, γ)26Al reaction journal, June 1987

Threshold states in 26Al journal, June 1983

Nuclear Data Sheets for A = 26 journal, May 2016

Title: Decay of the key 92-keV resonance in the ²⁵Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter ²⁶Al

Thermal Equilibration of ²⁶ Al
journal, August 2001

New estimates of the contribution of Wolf-Rayet stellar winds to the Galactic $\mathsf{^{26}}$Al
journal, December 2004

New experimental study of low-energy ( $p$ , $γ$ ) resonances in magnesium isotopes
journal, July 2010

Energy levels of A = 21–44 nuclei (VII)
journal, December 1990

New Physics Opportunities at Gammasphere
journal, January 1996

Carbon, nitrogen, magnesium, silicon, and titanium isotopic compositions of single interstellar silicon carbide grains from the Murchison carbonaceous chondrite
journal, July 1994

The Nucleosynthesis of ²⁶ Al and ⁶⁰ Fe in Solar Metallicity Stars Extending in Mass from 11 to 120 M _⊙ : The Hydrostatic and Explosive Contributions
journal, August 2006

Thermalization of long-lived nuclear isomeric states under stellar conditions
journal, May 1980

Structure of resonances in the Gamow burning window for the ${}^{25}{Al} (p, γ) {}^{26}{Si}$ reaction in novae
journal, September 2015

The 25Mg(p, γ)26Al reaction at low astrophysical energies
journal, January 2012

Lifetimes of $^{26} Al$ and $^{34} Cl$ in an astrophysical plasma
journal, December 1999

The GAMMASPHERE
journal, December 1990

Threshold states in 26Al revisited
journal, March 1986

Threshold states in 26Al: (II). Extraction of resonance strengths
journal, June 1983

Aluminum-26 in the early solar system - Fossil or fuel
journal, January 1977

Radioactive 26Al from massive stars in the Galaxy
journal, January 2006

Astrophysical aspects of the 25Mg(p, γ)26Al reaction
journal, June 1987

Threshold states in 26Al
journal, June 1983

Nuclear Data Sheets for A = 26
journal, May 2016