Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session F11: Minisymposium: Accessing the Third r-Process Peak: Nuclear Structure and Fission Studies
9:00 AM–11:45 AM,
Thursday, November 30, 2023
Hilton Waikoloa Village
Room: Kings 1
Chair: Maxime Brodeur, University of Notre Dame
Abstract: F11.00007 : Production and Discovery of Neutron Rich Isotopes by Fragmentation of 198Pt*
10:45 AM–11:00 AM
Presenter:
Kenny Haak
(Michigan State University)
Authors:
Kenny Haak
(Michigan State University)
Oleg B Tarasov
(Michigan State University)
Partha Chowdhury
(University of Massachusetts Lowell)
Andrew M Rogers
(University of Massachusetts Lowell)
Kartikeya Sharma
(University of Massachusetts Lowell)
Thomas Baumann
(FRIB/NSCL)
Daniel Bazin
(Michigan State University)
Peter C Bender
(University of Massachusetts Lowell)
Jun Chen
(FRIB)
Alfredo Estrade
(Central Michigan University)
Michael A Famiano
(Western Michigan University)
Dan C Foulds-Holt
(University of Cambridge)
Naoki Fukuda
(RIKEN)
Alexandra Gade
(FRIB)
Tom N Ginter
(FRIB/NSCL)
Richard W Gohier
(Western Michigan Universty)
Marc Hausmann
(Michigan State University)
Ava Hill
(Michigan State University)
Daniel E Hoff
(Lawrence Livermore National Laboratory)
Levi Klankowski
(Western Michigan University)
Elaine Kwan
(FRIB/NSCL)
Jingyi Li
(FRIB)
Sean N Liddick
(FRIB/NSCL)
Brenden R Longfellow
(Lawrence Livermore National Laboratory)
Stephanie M Lyons
(Pacific Northwest National Laboratory)
Chris Morse
(Brookhaven National Laboratory)
Mauricio Portillo
(Michigan State University)
Daniel Rhodes
(TRIUMF)
Andrea Richard
(Lawrence Livermore National Laboratory)
Sithira Samaranayake
(Central Michigan University)
Bradley M Sherrill
(Michigan State University)
Mark Spieker
(Florida State University)
Chandana S Sumithrarachchi
(FRIB/NSCL)
Hiroshi Suzuki
(RIKEN)
Kailong Wang
(Central Michigan Univ)
Sanjanee W Waniganeththi
(University of Massachusetts Lowell)
Dirk W Weisshaar
(Michigan State University)
Shaofei Zhu
(NNDC)
Collaboration:
The expertise of NSCL operations staff and of the A1900 separator group is gratefully acknowledged.
Production cross sections were measured for over 70 fragments produced by an 85 MeV/u 198Pt beam incident on a beryllium target, including three nuclei first observed in this work: 191, 192Hf and 189Lu. Event-by-event particle identification of A, Z, and q for the reaction products was performed by employing energy loss, time of flight, magnetic rigidity, and total kinetic energy measurements. Due to the existence of multiple charge up to C-like ions, a new analysis method was created, incorporating Monte Carlo calculations of charge state fractions for a given charge state of the projectile-residue just after the reaction. For the first time, charge-state probability distribution functions after the reaction have been deduced from experimental data.
This talk will discuss one possible method of rare-isotope production near N = 126 and the ability of a fragmentation residue to retain electrons from the primary beam.
*This experiment was performed at the NSF’s National Superconducting Cyclotron Laboratory (NSCL). This work was supported by the US National Science Foundation undergrants No. PHY-20-12040 and PHY-15-65546.
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