Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions

Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions

The 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reactions play an important role in astrophysics because they have significant influence on the neutron flux during the weak branch of the s-process. We constrain the astrophysical rates for these reactions by measuring partial α-widths of resonances in 26Mg locat...

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Main Authors: H. Jayatissa, G.V. Rogachev, V.Z. Goldberg, E. Koshchiy, G. Christian, J. Hooker, S. Ota, B.T. Roeder, A. Saastamoinen, O. Trippella, S. Upadhyayula, E. Uberseder
Format: Article
Language:English
Published: Elsevier 2020-03-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S037026932030071X
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spelling doaj-0a0a7fe922f44e8cabbf3a5301037d072020-11-25T02:27:29ZengElsevierPhysics Letters B0370-26932020-03-01802Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactionsH. Jayatissa0G.V. Rogachev1V.Z. Goldberg2E. Koshchiy3G. Christian4J. Hooker5S. Ota6B.T. Roeder7A. Saastamoinen8O. Trippella9S. Upadhyayula10E. Uberseder11Department of Physics & Astronomy, Texas A&M University, College Station, TX 77843, USA; Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA; Corresponding authors at: Department of Physics & Astronomy, Texas A&M University, College Station, TX 77843, USA.Department of Physics & Astronomy, Texas A&M University, College Station, TX 77843, USA; Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA; Nuclear Solutions Institute, Texas A&M University, College Station, TX 77843, USA; Corresponding authors at: Department of Physics & Astronomy, Texas A&M University, College Station, TX 77843, USA.Cyclotron Institute, Texas A&M University, College Station, TX 77843, USACyclotron Institute, Texas A&M University, College Station, TX 77843, USADepartment of Physics & Astronomy, Texas A&M University, College Station, TX 77843, USA; Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA; Nuclear Solutions Institute, Texas A&M University, College Station, TX 77843, USADepartment of Physics & Astronomy, Texas A&M University, College Station, TX 77843, USA; Cyclotron Institute, Texas A&M University, College Station, TX 77843, USACyclotron Institute, Texas A&M University, College Station, TX 77843, USACyclotron Institute, Texas A&M University, College Station, TX 77843, USACyclotron Institute, Texas A&M University, College Station, TX 77843, USADepartment of Physics and Geology, University of Perugia, and Instituto Nazionale di Fisica Nucleare, Secion of Perugia, Via A. Pascoli, 06123, Perugia, ItalyDepartment of Physics & Astronomy, Texas A&M University, College Station, TX 77843, USA; Cyclotron Institute, Texas A&M University, College Station, TX 77843, USACyclotron Institute, Texas A&M University, College Station, TX 77843, USAThe 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reactions play an important role in astrophysics because they have significant influence on the neutron flux during the weak branch of the s-process. We constrain the astrophysical rates for these reactions by measuring partial α-widths of resonances in 26Mg located in the Gamow window for the Ne22+α capture. These resonances were populated using 22Ne(6Li,d)26Mg and 22Ne(7Li,t)26Mg reactions at energies near the Coulomb barrier. At these low energies α-transfer reactions favor population of low spin states and the extracted partial α-widths for the observed resonances exhibit only minor dependence on the model parameters. The astrophysical rates for both the 22Ne(α,γ)26Mg and the 22Ne(α,n)25Mg reactions are shown to be significantly different than the previously suggested values. Keywords: s-Process, Reaction rate, 22Ne(α,γ)26Mg, 22Ne(α,n)25Mg, Sub-Coulomb α-transfer reactionhttp://www.sciencedirect.com/science/article/pii/S037026932030071X
collection DOAJ
language English
format Article
sources DOAJ
author H. Jayatissa
G.V. Rogachev
V.Z. Goldberg
E. Koshchiy
G. Christian
J. Hooker
S. Ota
B.T. Roeder
A. Saastamoinen
O. Trippella
S. Upadhyayula
E. Uberseder
spellingShingle H. Jayatissa
G.V. Rogachev
V.Z. Goldberg
E. Koshchiy
G. Christian
J. Hooker
S. Ota
B.T. Roeder
A. Saastamoinen
O. Trippella
S. Upadhyayula
E. Uberseder
Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions
Physics Letters B
author_facet H. Jayatissa
G.V. Rogachev
V.Z. Goldberg
E. Koshchiy
G. Christian
J. Hooker
S. Ota
B.T. Roeder
A. Saastamoinen
O. Trippella
S. Upadhyayula
E. Uberseder
author_sort H. Jayatissa
title Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions
title_short Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions
title_full Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions
title_fullStr Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions
title_full_unstemmed Constraining the 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reaction rates using sub-Coulomb α-transfer reactions
title_sort constraining the 22ne(α,γ)26mg and 22ne(α,n)25mg reaction rates using sub-coulomb α-transfer reactions
publisher Elsevier
series Physics Letters B
issn 0370-2693
publishDate 2020-03-01
description The 22Ne(α,γ)26Mg and 22Ne(α,n)25Mg reactions play an important role in astrophysics because they have significant influence on the neutron flux during the weak branch of the s-process. We constrain the astrophysical rates for these reactions by measuring partial α-widths of resonances in 26Mg located in the Gamow window for the Ne22+α capture. These resonances were populated using 22Ne(6Li,d)26Mg and 22Ne(7Li,t)26Mg reactions at energies near the Coulomb barrier. At these low energies α-transfer reactions favor population of low spin states and the extracted partial α-widths for the observed resonances exhibit only minor dependence on the model parameters. The astrophysical rates for both the 22Ne(α,γ)26Mg and the 22Ne(α,n)25Mg reactions are shown to be significantly different than the previously suggested values. Keywords: s-Process, Reaction rate, 22Ne(α,γ)26Mg, 22Ne(α,n)25Mg, Sub-Coulomb α-transfer reaction
url http://www.sciencedirect.com/science/article/pii/S037026932030071X
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