TY - JOUR

T1 - Cross section of α-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical γ process

AU - Szücs, T.

AU - Kiss, G. G.

AU - Gyürky, Gy

AU - Halász, Z.

AU - Fülöp, Zs

AU - Rauscher, T.

N1 - © 2017 The Authors. Published by Elsevier B. V.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

PY - 2018/1/10

Y1 - 2018/1/10

N2 - The stellar reaction rates of radiative α-capture reactions on heavy isotopes are of crucial importance for the γ process network calculations. These rates are usually derived from statistical model calculations, which need to be validated, but the experimental database is very scarce. This paper presents the results of α-induced reaction cross section measurements on iridium isotopes carried out at first close to the astrophysically relevant energy region. Thick target yields of 191Ir(α,γ)195Au, 191Ir(α,n)194Au, 193Ir(α,n)196mAu, 193Ir(α,n)196Au reactions have been measured with the activation technique between Eα=13.4 MeV and 17 MeV. For the first time the thick target yield was determined with X-ray counting. This led to a previously unprecedented sensitivity. From the measured thick target yields, reaction cross sections are derived and compared with statistical model calculations. The recently suggested energy-dependent modification of the α + nucleus optical potential gives a good description of the experimental data.

AB - The stellar reaction rates of radiative α-capture reactions on heavy isotopes are of crucial importance for the γ process network calculations. These rates are usually derived from statistical model calculations, which need to be validated, but the experimental database is very scarce. This paper presents the results of α-induced reaction cross section measurements on iridium isotopes carried out at first close to the astrophysically relevant energy region. Thick target yields of 191Ir(α,γ)195Au, 191Ir(α,n)194Au, 193Ir(α,n)196mAu, 193Ir(α,n)196Au reactions have been measured with the activation technique between Eα=13.4 MeV and 17 MeV. For the first time the thick target yield was determined with X-ray counting. This led to a previously unprecedented sensitivity. From the measured thick target yields, reaction cross sections are derived and compared with statistical model calculations. The recently suggested energy-dependent modification of the α + nucleus optical potential gives a good description of the experimental data.

KW - Activation method

KW - Astrophysical γ process

KW - Nuclear astrophysics

KW - Thick target yield

KW - α-induced reactions

UR - http://www.scopus.com/inward/record.url?scp=85037037338&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2017.11.072

DO - 10.1016/j.physletb.2017.11.072

M3 - Article

AN - SCOPUS:85037037338

SN - 0370-2693

VL - 776

SP - 396

EP - 401

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -