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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
β+ Gamow-teller transition strengths from Ti 46 and stellar electron-capture rates
Physical Review Letters, Volume 112, No. 25, Article 252501, Year 2014
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Description
The Gamow-Teller strength in the β+ direction to Sc46 was extracted via the Ti46(t,He3+γ) reaction at 115MeV/u. The γ-ray coincidences served to precisely measure the very weak Gamow-Teller transition to a final state at 991 keV. Although this transition is weak, it is crucial for accurately estimating electron-capture rates in astrophysical scenarios with relatively low stellar densities and temperatures, such as presupernova stellar evolution. Shell-model calculations with different effective interactions in the pf shell-model space do not reproduce the experimental Gamow-Teller strengths, which is likely due to sd-shell admixtures. Calculations in the quasiparticle random phase approximation that are often used in astrophysical simulations also fail to reproduce the experimental Gamow-Teller strength distribution, leading to strongly overestimated electron-capture rates. Because reliable theoretical predictions of Gamow-Teller strengths are important for providing astrophysical electron-capture reaction rates for a broad set of nuclei in the lower pf shell, we conclude that further theoretical improvements are required to match astrophysical needs. © 2014 American Physical Society.
Authors & Co-Authors
Noji, Shumpei
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Zegers, Remco G.T.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Austin, Sam M.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Baugher, Travis R.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Bazin, Daniel P.
United States, Alexandria
National Science Foundation
Brown, B. Alex
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Campbell, C. M.
United States, Berkeley
Lawrence Berkeley National Laboratory
Cole, A. L.
United States, Kalamazoo
Kalamazoo College
Doster, H. J.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Gade, Alexandra
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Guess, C. J.
United States, Lowell
University of Massachusetts Lowell
United States, Glassboro
Rowan University
Gupta, Sanjib S.
India, Rupnagar
Indian Institute of Technology Ropar
Hitt, George Wesley
United Arab Emirates, Abu Dhabi
Khalifa University of Science and Technology
Langer, C.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Lipschutz, Samuel
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Lunderberg, E. M.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Meharchand, Rhiannon T.
United States, Los Alamos
Los Alamos National Laboratory
Meisel, Zachary P.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Perdikakis, Georgios
United States, Alexandria
National Science Foundation
United States, Mount Pleasant
Central Michigan University
Pereira, Jorge R.
United States, Alexandria
National Science Foundation
Recchia, Francesco
United States, Alexandria
National Science Foundation
Schatz, Hendrik
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Scott, Mike J.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Stroberg, S. R.
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Sullivan, Chris
United States, Alexandria
National Science Foundation
United States, East Lansing
Michigan State University
Valdez, L.
United States, Alexandria
National Science Foundation
Walz, Ch
United States, Alexandria
National Science Foundation
Weisshaar, Dirk
United States, Alexandria
National Science Foundation
Williams, S. J.
United States, Alexandria
National Science Foundation
Wimmer, Kathrin
United States, Alexandria
National Science Foundation
United States, Mount Pleasant
Central Michigan University
Statistics
Citations: 30
Authors: 30
Affiliations: 10
Identifiers
Doi:
10.1103/PhysRevLett.112.252501
ISSN:
00319007
e-ISSN:
10797114