Spectroscopy of the N=Z-2 nucleus {sup 46}Cr and mirror energy differences

Journal Article · Mon Jan 15 00:00:00 EST 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.014307· OSTI ID:20990946

Garrett, P E ^[1]; Lenzi, S M ^[2]; Algin, E ^[3]; Appelbe, D; Cameron, J A ^[4]; Bauer, R W; Becker, J A; Bernstein, L A ^[5]; Carpenter, M P; Janssens, R V. F.; Lister, C J; Seweryniak, D ^[6]; Warner, D D ^[7]

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1. Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1 (Canada)
2. Dipartimento di Fisica and INFN, Padova (Italy)
3. Department of Physics, Eskisehir Osmangazi University, Meselik, Eskisehir, TR-26480 (Turkey)
4. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
5. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
6. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
7. CLRC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD (United Kingdom)

Excited states in {sup 46}Cr were sought using the {sup 12}C({sup 36}Ar,2n) reaction. Gamma rays were detected with the Gammasphere array, and the Z value of the reaction products was determined with an ionization chamber located at the focal plane of the Fragment Mass Analyzer. In addition to the ground-state band observed up to I{sup {pi}}=10{sup +} (tentatively 12{sup +}), five states are proposed to belong to the 3{sup -} band. The mirror energy differences with the analog states in {sup 46}Ti present a pronounced staggering effect between the odd and even spin members that is reproduced well by shell-model calculations incorporating the different Coulomb contributions, monopole, multipole, and single-particle effects together with an isospin-nonconserving interaction that accounts for the so-called J=2 anomaly. Dramatically different E1 decay patterns for members of the 3{sup -} band between the {sup 46}Cr and {sup 46}Ti mirrors are also observed.

• OSTI ID: 20990946
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 75, Issue 1; Other Information: DOI: 10.1103/PhysRevC.75.014307; (c) 2007 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
ARGON 36
CARBON 12
CHROMIUM 46
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
GAMMA RADIATION
GROUND STATES
HEAVY ION REACTIONS
IONIZATION CHAMBERS
ISOBARIC ANALOGS
ISOSPIN
MASS NUMBER
MIRRORS
SHELL MODELS
SPECTROSCOPY
SPIN
TITANIUM 46