New neutron-rich microsecond isomers observed among fission products of {sup 238}U at 80 MeV/nucleon

Journal Article · Mon Jun 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.064318· OSTI ID:21289913

Folden, III, C M; Ginter, T N; Hausmann, M; Portillo, M ^[1]; Nettleton, A S; Amthor, A M; Sherrill, B M ^[1]; Kubo, T; Takeda, H ^[2]; Loveland, W ^[3]; Manikonda, S L ^[4]; Morrissey, D J ^[1]; Nakao, T ^[2]; Souliotis, G A ^[5]; Strong, B F ^[6]; Tarasov, O B ^[1]

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1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
2. RIKEN Nishina Center, RIKEN, Wako, Saitama 351-0198 (Japan)
3. Department of Chemistry, Oregon State University, Corvallis, Oregon 97330 (United States)
4. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
5. Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)
6. Department of Chemistry, Michigan State University, East Lansing, Michigan 48824 (United States)

Eight new isomeric states in neutron-rich nuclides have been discovered in fission fragments produced by the reaction of an 80 MeV/nucleon {sup 238}U beam with a {sup 9}Be target and separated in-flight using the A1900 fragment separator. The experiment was conducted at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. Gamma rays were detected in a high-purity germanium detector located at the focal plane within a time window of 20 {mu}s following ion implantation. In some cases the isomers were observed to decay into previously reported states, allowing us to assign the initial decay from the isomeric state. Among the outcomes, the results suggest that many studies on the nuclear structure of medium-mass neutron-rich nuclei are feasible at projectile fragmentation facilities using induced fission.

• OSTI ID: 21289913
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 79, Issue 6; Other Information: DOI: 10.1103/PhysRevC.79.064318; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BEAMS
BERYLLIUM 9 TARGET
FISSION
FISSION FRAGMENTS
FISSION PRODUCTS
FRAGMENTATION
GAMMA RADIATION
GE SEMICONDUCTOR DETECTORS
ION IMPLANTATION
ISOMERS
MASS
MEV RANGE 10-100
NEUTRON-RICH ISOTOPES
NEUTRONS
NUCLEAR STRUCTURE
SUPERCONDUCTING CYCLOTRONS
URANIUM 238