Kriti Mahajan
(II. Physikalisches Institut, Justus-Liebig-Universitat, Heinrich-Buff-Ring 16, 35392 Gießen, Germany and Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtz Center for Heavy Ion Research, Gießen, 35392, Germany)
To study the r-process, experimental information is scarce and modern r-process network calculations rely on theoretical models that give divergent predictions as one moves away from the valley of stability. Nuclear masses help to determine the r-process path and shed light on the nucleosynthesis environment.
The neutron-rich nuclei at $N = 126$ that populate the r-process third abundance peak are of specific interest, but they are challenging to produce. The use of high-energy heavy-ion beams with the Fragment Separator (FRS) at GSI facilitates the study of neutron-rich nuclei in this region. An experiment was performed within FAIR Phase-0 with the goal to search for new isotopes in the neutron rich region and to measure masses and half-lives, where the neutron-rich nuclei were produced at the FRS using a 1 GeV/u $^{208}Pb$ beam on a 4g/cm$^{2}$ thick $^{9}Be$ target using the fragmentation reaction. The novel technique of mean range bunching was used to measure multiple fragments in one setting, and the precise mass measurements were performed using the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). The MR-TOF-MS features a high resolving power of up to 1,000,000, short cycle times of a few tens of milliseconds, and mass accuracy down to 20 keV was achieved in this experiment.
During the experiment, masses of fifteen nuclei around $N = 126$ were measured, of which four masses were measured for the first time. The results of this experiment will be presented, including the first mass measurements of $^{204}Au$ and $^{205}Au$, where significant deviations from the AME2020 extrapolations indicate a change in the nuclear structure. Irregularities in the mass surface are being studied using the Skyrme Hartree-Fock plus BCS calculations.
| Email address |
mahajan.kriti@exp2.physik.uni-giessen.de
|
| Supervisor's Name |
Prof. Dr. Christoph Scheidenberger
|
| Supervisor's email |
C.Scheidenberger@gsi.de
|
| Classification |
Ion guide, gas catcher, and beam manipulation techniques
|
Kriti Mahajan
(II. Physikalisches Institut, Justus-Liebig-Universitat, Heinrich-Buff-Ring 16, 35392 Gießen, Germany and Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtz Center for Heavy Ion Research, Gießen, 35392, Germany)
Daler Amanbayev
(II. Physikalisches Institut, Justus-Liebig-Universitat, Heinrich-Buff-Ring 16, 35392 Gießen, Germany)
Alison Bruce
(School of Computing Engineering and Mathematics, University of Brighton, Brighton, United Kingdom)
Timo Dickel
(II. Physikalisches Institut, Justus-Liebig-Universitat, Heinrich-Buff-Ring 16, 35392 Gießen, Germany and GSI Helmholtzzentrum for Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany)
Tuomas Grahn
(Accelerator Laboratory, Department of Physics, University of Jyväskylä, Jyväskylä, Finland)
Emma Haettner
(GSI Helmholtzzentrum for Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany)
Christine Hornung
(GSI Helmholtzzentrum for Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany)
Gabriella Kripko-Koncz
(II. Physikalisches Institut, Justus-Liebig-Universitat, Heinrich-Buff-Ring 16, 35392 Gießen, Germany and University of Edinburgh, James Clerk Maxwell Building, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, Scotland, United Kingdom)
Ali Akbar Mehmandoost-Khajeh-Dad
(Physics Department, University of Sistan and Baluchestan, Zahedan, Iran)
Nikolay Minkov
(Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria)
Stephane Pietri
(GSI Helmholtzzentrum for Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany)
Wolfgang Plass
(II. Physikalisches Institut, Justus-Liebig-Universitat, Heinrich-Buff-Ring 16, 35392 Gießen, Germany and GSI Helmholtzzentrum for Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany)
Christoph Scheidenberger
(II. Physikalisches Institut, Justus-Liebig-Universitat, Heinrich-Buff-Ring 16, 35392 Gießen, Germany and Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtz Center for Heavy Ion Research, Gießen, 35392, Germany and GSI Helmholtzzentrum for Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany)
Super-FRS Experiment Collaboration
There are no materials yet.
