Abstract
The production of 77,79,85,85mKr and 77Br via the reaction Se() was investigated between and 15 MeV using the activation technique. The irradiation of natural selenium targets on aluminum backings was conducted at the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Germany. The spectroscopic analysis of the reaction products was performed using a high-purity germanium detector located at PTB and a low energy photon spectrometer detector at the Goethe University Frankfurt, Germany. Thick-target yields were determined. The corresponding energy-dependent production cross sections of 77,79,85,85mKr and 77Br were calculated from the thick-target yields. Good agreement between experimental data and theoretical predictions using the TALYS-1.6 code was found.
Highlights
Elements heavier than iron are almost exclusively produced in neutron capture processes, the r and s process [1,2,3]
The selenium samples were irradiated with α-particles at the cyclotron at Physikalisch-Technische Bundesanstalt (PTB) [22]
Doubly-charged He ions were extracted from the cyclotron to irradiate the samples in the activation chamber, which is designed as a Faraday cup
Summary
Elements heavier than iron are almost exclusively produced in neutron capture processes, the r and s process [1,2,3]. A matter of great interest over the years has been the isotope 85Kr [6] It represents a branching point in the s process because the β-decay rate and the neutron capture rate compete. An explanation of the relation between the observed spread in abundance ratio to the physical conditions inside the star is only possible, if the neutron capture cross section of 85Kr is sufficiently well known [8]. No measurement of the neutron capture cross section of 85Kr in standard kinematics has been performed in the astrophysically interesting keV-regime. Since the corresponding production cross sections are not well known, natural Se was irradiated with α-particles of different energies. The subsequent γ-spectroscopy of the freshly produced radioactive isotopes allowed the determination of production yields for thick targets as well as the determination of cross sections
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