Discovery of a Nuclear Isomer in {sup 65}Fe with Penning Trap Mass Spectrometry

A new long-lived isomeric state in {sup 65}Fe has been discovered with Penning trap mass spectrometry and high-precision mass measurements of the neutron-rich isotopes {sup 63-65}Fe and {sup 64-66}Co have been performed with the Low-Energy Beam and Ion Trap Facility at the NSCL. For the new isomer i...

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Bibliographic Details
Published in:Physical review letters 2008-04, Vol.100 (13)
Main Authors: Block, M., Bachelet, C., Bollen, G., Facina, M., Folden, C. M. III, Guenaut, C., Kwiatkowski, A. A., Morrissey, D. J., Pang, G. K., Prinke, A., Ringle, R., Savory, J., Schury, P., Schwarz, S.
Format: Article
Language:English
Subjects:
COBALT 64
COBALT 65
COBALT 66
EXCITATION
GROUND STATES
IRON 63
IRON 64
IRON 65
ISOMERS
KEV RANGE 100-1000
MASS
MASS DIFFERENCE
MASS SPECTROSCOPY
NEUTRON-RICH ISOTOPES
NUCLEAR PHYSICS AND RADIATION PHYSICS
TRAPS
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Summary:A new long-lived isomeric state in {sup 65}Fe has been discovered with Penning trap mass spectrometry and high-precision mass measurements of the neutron-rich isotopes {sup 63-65}Fe and {sup 64-66}Co have been performed with the Low-Energy Beam and Ion Trap Facility at the NSCL. For the new isomer in {sup 65}Fe an excitation energy of 402(5) keV has been determined from the measured mass difference between the isomeric and ground states. The mass uncertainties of all isotopes have been reduced by a factor of 10-100 compared to previous results. In the case of {sup 64}Co the previous mass value was found to deviate by about 5 standard deviations from the new measurement.
ISSN:0031-9007
1079-7114
DOI:10.1103/PHYSREVLETT.100.132501