Disappearance of the N=14 shell
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
- Department of Physics, Florida State University, Tallahassee, Florida 32303 (United States)
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
- Department of Physics, Wabash College, Crawfordsville, Indiana 47933 (United States)
- Department of Physics, Hope College, Holland, Michigan 49423 (United States)
- Department of Physics, Central Michigan University, Mt. Pleasant, Michigan, 48859 (United States)
- Department of Physics, Westmont College, Santa Barbara, California 93108 (United States)
An excited state of {sup 22}N unbound with respect to neutron emission was observed in a stripping reaction from a 85 MeV/nucleon {sup 26}F beam. The observed decay energy of 650(50) keV places the level, which is interpreted to be the first 3{sup -} state, at an excitation energy of 1.93(22) MeV. Together with the previously measured bound states of {sup 22}N, reduction of the N=14 shell gap compared to less neutron-rich nitrogen isotopes at the neutron dripline is observed. Based on the magnitude of the reduction of the shell gap for {sup 22}N, a disappearance of the gap and even a level inversion of the {nu}1s{sub 1/2} and the {nu}0d{sub 5/2} levels in the neutron-unbound nucleus {sup 21}C seems likely.
- OSTI ID:
- 21290034
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 80, Issue 2; Other Information: DOI: 10.1103/PhysRevC.80.021302; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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