CNO cycle: "Soft E1" mode of the 17Ne excitation in the 17Ne+γ → 15O+2p reaction

6th Nuclear Physics in Astrophysics

物理学;天文学

Parfenova, Yu.L.^1,2 ; Grigorenko, L.V.^1,3,4 ; Egorova, I.A.^1 ; Shulgina, N.B.^3 ; Zhukov, M.V.^5

JINR, Dubna, Russia^1

INP MSU, Moscow, Russia^2

RRC KI, Moscow, Russia^3

GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany^4

Chalmers University of Technology, Göteborg, Sweden^5

关键词: Capture rate;    CNO-cycle;    Coulomb dissociations;    Coulomb excitation;    Nuclear astro-physics;    Phenomenological approach;    Strength function;    Time-reversed;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/665/1/012047/pdf
DOI  :  10.1088/1742-6596/665/1/012047

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The15O(2p, γ)17Ne reaction is studied using the time-reversed reaction of the17Ne E1 Coulomb dissociation on lead target in the context of nuclear astrophysics. Looking for the relation between the data on the Coulomb excitation and the astrophysical 2p-capture rate, one faces problem to extract the Coulomb E1 strength function from the measured Coulex cross section. We use a number of phenomenological approaches to estimate influence of such processes as Coulomb-nuclear interference, populations of states with different Jπ, etc. We calculate the17Ne+2p astrophysical capture rate and compare the results with different calculations.