Nuclear level density and γ -ray strength function of Ni 67 and the impact on the i process

Summary, in English

Proton-γ coincidences from (d,p) reactions between a Ni66 beam and a deuterated polyethylene target have been analyzed with the inverse-Oslo method to find the nuclear level density (NLD) and γ-ray strength function (γSF) of Ni67. The Ni66(n,γ) capture cross section has been calculated using the Hauser-Feshbach model in TALYS using the measured NLD and γSF as constraints. The results confirm that the Ni66(n,γ) reaction acts as a bottleneck when relying on one-zone nucleosynthesis calculations. However, the impact of this reaction is strongly dampened in multizone models of low-metallicity AGB stars experiencing i-process nucleosynthesis.

• Author: V. W. Ingeberg; S. Siem; M. Wiedeking; A. Choplin; S. Goriely; L. Siess; K. J. Abrahams; K. Arnswald; F. Bello Garrote; D. L. Bleuel; J. Cederkäll; T. L. Christoffersen; D. M. Cox; H. De Witte; L. P. Gaffney; A. Görgen; C. Henrich; A. Illana; P. Jones; B. V. Kheswa; T. Kröll; S. N.T. Majola; K. L. Malatji; J. Ojala; J. Pakarinen; G. Rainovski; P. Reiter; M. Von Schmid; M. Seidlitz; G. M. Tveten; N. Warr; F. Zeiser
• Department/s: Particle and nuclear physics; Department of Physics
• Publishing year: 2025-01
• Language: English
• Publication/Series: Physical Review C
• Volume: 111
• Issue: 1
• Links: http://dx.doi.org/10.1103/PhysRevC.111.015803
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 2469-9985