| Title: |
Direct Mass Measurements of Neutron-Rich Zinc and Gallium Isotopes : An Investigation of the Formation of the First 𝑟-Process Peak |
| Authors: |
Jacobs, Andrew; Nikas, Stylianos; Ash, John; Ashrafkhani, Behnam; Belosovic, Ivana; Bergmann, Julian; Brown, Callum; Cardona, Jaime; Dunling, Eleanor; Dickel, Timo; Egoriti, Luca; Gelinas, Gabriella; Hockenbery, Zach; Kakkar, Sakshi; Kootte, Brian; Mollaebrahimi, Ali; Lykiardopoulou, Eleni Marina; Murböck, Tobias; Paul, Stefan; Plaß, Wolfgang R.; Porter, William S.; Reiter, Moritz Pascal; Ridley, Alex; Ringuette, Jon; Scheidenberger, Christoph; Simpson, Rane; Walls, Coulter; Wang, Yilin; Dilling, Jens; Kwiatkowski, Ania |
| Publisher Information: |
American Physical Society |
| Publication Year: |
2025 |
| Collection: |
JYX - Jyväskylä University Digital Archive / Jyväskylän yliopiston julkaisuarkisto |
| Subject Terms: |
binding energy & masses; nuclear astrophysics; rare & new isotopes; 59 ≤ A ≤ 89; radioactive beams; spectrometers & spectroscopic techniques; hiukkasfysiikka; ydinfysiikka |
| Description: |
The prediction of isotopic abundances resulting from the rapid neutron capture process (𝑟 process) requires high-precision mass measurements. Using TITAN’s on-line time-of-flight spectrometer, first time mass measurements are performed for 83Zn and 86Ga. These measurements reduced uncertainties, and are used to calculate isotopic abundances near the first 𝑟-process abundance peak using astrophysical conditions present during a binary neutron star (BNS) merger. Good agreement in abundance across a range of trajectories is found when comparing to several metal-poor stars while also strongly deviating from the solar 𝑟-process pattern. These findings point to a high degree of sensitivity to the electron fraction of a BNS merger on the final elemental abundance pattern for certain elements near the first 𝑟-process peak while others display universality. We find that small changes in electron fraction can produce distinct abundance patterns that match those of metal-poor stars with different classifications. ; peerReviewed |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf; fulltext |
| Language: |
English |
| ISSN: |
0031-9007 |
| Relation: |
Physical Review Letters; 134 |
| Availability: |
http://urn.fi/URN:NBN:fi:jyu-202502202117 |
| Rights: |
In Copyright ; © 2025 American Physical Society ; openAccess ; http://rightsstatements.org/page/InC/1.0/?language=en |
| Accession Number: |
edsbas.1BD1275A |
| Database: |
BASE |