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Production and discovery of neutron-rich isotopes by fragmentation of 198Pt

Journal Article · · Physical Review. C
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  1. Michigan State University, East Lansing, MI (United States); Michigan State University
  2. Michigan State University, East Lansing, MI (United States)
  3. University of Massachusetts Lowell, MA (United States)
  4. Central Michigan University, Mt Pleasant, MI (United States)
  5. Western Michigan University, Kalamazoo, MI (United States)
  6. University of Massachusetts Lowell, MA (United States); University of Cambridge (United Kingdom)
  7. RIKEN Nishina Center, Saitama (Japan)
  8. University of Massachusetts Lowell, MA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  9. Michigan State University, East Lansing, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  10. Michigan State University, East Lansing, MI (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  11. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  12. Michigan State University, East Lansing, MI (United States); TRIUMF, Vancouver, BC (Canada)
  13. Michigan State University, East Lansing, MI (United States); Florida State University, Tallahassee, FL (United States)
  14. Brookhaven National Laboratory (BNL), Upton, NY (United States)
+ Show Author Affiliations

Production cross sections were measured for fragments produced by an 85 MeV/u 198Pt beam incident on a beryllium target. 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. Over 70 nuclei in the Hf-Pt region were identified, including three isotopes first observed in this work: 191,192Hf and 189Lu. Due to the existence of multiple charge states between H-like and C-like ions, a new analysis method was introduced, 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. Furthermore, this study provides insight into how to produce key nuclides near N = 126 and the ability of a fragmentation residue to retain electrons from the primary beam.

Research Organization:
Michigan State University, East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)
Grant/Contract Number:
SC0023633; AC02-05CH11231; FG02-94ER40848; AC02-98CH10886; SC0022538
OSTI ID:
1998848
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 108; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

190 ≤ A ≤ 219
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Models & methods for nuclear reactions
Monte Carlo methods
Nuclear data analysis & compilation
Nuclear fragmentation
Rare & new isotopes