Isospin character of low-lying states in {sup 56}Fe

Journal Article · Sat Jun 01 00:00:00 EDT 1996 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.53.2718· OSTI ID:284757

De Leo, R; Akimune, H; Blasi, N; Daito, I; Fujita, Y; Fujiwara, M; Hayakawa, S I; Hatori, S; Hosono, K; Ikegami, H; Inomata, T; Katayama, I; Katori, K; Lagamba, L; Micheletti, S; Morinobu, S; Nakagawa, T; Nakayama, S; Narita, A; Noro, T ; Perrino, R; Pignanelli, M; Sakaguchi, H; Takamatsu, J; Tamii, A; Tamura, K; Tanaka, M; Terakawa, A; Tohei, T; Tosaki, M; Yamagata, T; Yamagoshi, A; Yosimura, M; Yosoi, M ^[1]

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1. Research Center for Nuclear Physics, Osaka University, Osaka 567 (Japan)

Low-lying states in {sup 56}Fe, up to an excitation energy of about 4 MeV, have been investigated by means of inelastic proton and deuteron scattering experiments at {ital E}{sub {ital p}}=65 and 400 MeV and at {ital E}{sub {ital d}}=56 MeV, respectively. Measured cross sections and analyzing powers have been compared with coupled-channels calculations using collective form factors; calculations in both the Schr{umlt o}dinger and Dirac formalisms have been carried out for the proton data. For each probe, the matrix elements have been deduced for transitions from the ground state and from the 2{sub 1}{sup +} state to six quadrupole (2{sup +}) states to one octupole (3{sub 1}{sup {minus}}) and two hexadecapole (4{sub 1}{sup +} and 4{sub 2}{sup +}) states. The obtained matrix elements and the previous values from {gamma} decay or electron inelastic scattering have been used to evaluate the isospin character of the transitions. To discuss the quadrupole mixed-symmetry states in {sup 56}Fe, the deduced neutron ({ital M}{sub {ital n}}) and proton ({ital M}{sub {ital p}}) components of the matrix elements, or equivalently the isoscalar ({ital M}{sub {ital s}}) and isovector ({ital M}{sub {ital v}}) parts, have been compared with theoretical calculations based on the neutron-proton interacting boson model and on the shell model evaluated in a full {ital f}-{ital p} configuration space. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284757
• Journal Information: Physical Review, C, Vol. 53, Issue 6; Other Information: PBD: Jun 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
IRON 56
ENERGY LEVELS
PROTON REACTIONS
INELASTIC SCATTERING
DEUTERON REACTIONS
IRON 56 TARGET
EXCITATION
COUPLED CHANNEL THEORY
CROSS SECTIONS
FORM FACTORS
MATRIX ELEMENTS
QUADRUPOLES
OCTUPOLES
HEXADECAPOLES
INTERACTING BOSON MODEL
SHELL MODELS
ISOSPIN
MEV RANGE 10-100
MEV RANGE 100-1000
POLARIZATION-ASYMMETRY RATIO