Radiative Width of the Hoyle State from γ-Ray Spectroscopy.

Autor: Kibédi T; Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia., Alshahrani B; Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.; Department of Physics, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia., Stuchbery AE; Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia., Larsen AC; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Görgen A; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Siem S; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Guttormsen M; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Giacoppo F; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Morales AI; Dipartimento di Fisica dell'Universitá degli Studi di Milano and INFN-Milano, 20133 Milano, Italy., Sahin E; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Tveten GM; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Garrote FLB; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Campo LC; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Eriksen TK; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Klintefjord M; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Maharramova S; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Nyhus HT; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Tornyi TG; Department of Physics, University of Oslo, N-0316 Oslo, Norway.; Institute of Nuclear Research, MTA ATOMKI, Debrecen H-4026, Hungary., Renstrøm T; Department of Physics, University of Oslo, N-0316 Oslo, Norway., Paulsen W; Department of Physics, University of Oslo, N-0316 Oslo, Norway.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2020 Oct 30; Vol. 125 (18), pp. 182701.
DOI: 10.1103/PhysRevLett.125.182701
Abstrakt: The cascading 3.21 and 4.44 MeV electric quadrupole transitions have been observed from the Hoyle state at 7.65 MeV excitation energy in ^{12}C, excited by the ^{12}C(p,p^{'}) reaction at 10.7 MeV proton energy. From the proton-γ-γ triple coincidence data, a value of Γ_{rad}/Γ=6.2(6)×10^{-4} was obtained for the radiative branching ratio. Using our results, together with Γ_{π}^{E0}/Γ from Eriksen et al. [Phys. Rev. C 102, 024320 (2020)PRVCAN2469-998510.1103/PhysRevC.102.024320] and the currently adopted Γ_{π}(E0) values, the radiative width of the Hoyle state is determined as Γ_{rad}=5.1(6)×10^{-3}  eV. This value is about 34% higher than the currently adopted value and will impact models of stellar evolution and nucleosynthesis.
Databáze: MEDLINE