First {gamma}-ray spectroscopy of {sup 49}Fe and {sup 53}Ni: Isospin-breaking effects at large proton excess

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.011306· OSTI ID:21289964

Brown, J R; Bentley, M A; Taylor, M J ^[1]; Adrich, P; Bazin, D; Cook, J M; Diget, C A; Gade, A; Glasmacher, T; McDaniel, S; Ratkiewicz, A; Siwek, K; Weisshaar, D ^[2]; Lenzi, S M ^[3]; Pritychenko, B ^[4]

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1. Department of Physics, University of York, Heslington, York, YO10 5DD (United Kingdom)
2. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
3. Dipartimento di Fisica and INFN, Padova (Italy)
4. National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973 (United States)

Isospin-breaking effects have been studied for the first time in T=(3/2) isobaric analog states. Gamma decays have been observed from T{sub z}=-(3/2) nuclei, {sup 49}Fe and {sup 53}Ni, presented here in new level schemes, and mirror energy differences have been computed following observation of analog states in {sup 49}V and {sup 53}Mn, respectively. Shell-model calculations in the fp shell are in good agreement with the data and reveal the importance of non-Coulomb isospin-breaking effects in T=(3/2) isobaric analog states. A two-step fragmentation process was developed to allow access to highly proton-rich nuclei and to produce each member of a mirror pair via mirrored fragmentation of a {sup 56}Ni secondary beam. This work represents the first study using this technique and demonstrates the power of this approach for future studies of isobaric analog states in very proton-rich systems.

• OSTI ID: 21289964
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 1 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPUTER CALCULATIONS
FRAGMENTATION
GAMMA DECAY
GAMMA SPECTROSCOPY
IRON 49
ISOBARIC ANALOGS
ISOSPIN
MANGANESE 53
NEUTRON-DEFICIENT ISOTOPES
NICKEL 53
NICKEL 56
PROTONS
SECONDARY BEAMS
SHELL MODELS
VANADIUM 49