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Title: Transition rates of high-spin states in /sup 56/Co and /sup 56/Fe: Possible coexistence of prolate- and oblate-like configurations in /sup 56/Fe. [Angular distributions and excitation functions for /sup 54/Fe(. cap alpha. ,pn) and (. cap alpha. ,2p) reactions at 20. 4 to 29. 5 MeV]

Abstract

The decay properties of the high-spin states in /sup 56/Co and /sup 56/Fe have been investigated via the /sup 54/Fe(..cap alpha.., pn)/sup 56/Co*(..gamma..) and /sup 54/Fe(..cap alpha.., 2p)/sup 56/Fe*(..gamma..) reactions in the energy range 20.4 to 29.5 MeV. From measurements of excitation functions and angular distributions of individual ..gamma.. rays with a Ge(Li)--NaI(Tl) anti-Compton spectrometer, and from ..gamma gamma..-coincidence experiments, new levels in /sup 56/Co have been identified at 2282.6 (7/sup +//sub 1/), 2371.9 (6/sup +//sub 1/), 3638.0 (8/sup +//sub 1/), 4180.2 (9/sup +//sub 1/), and 5274.6 (10/sup +//sub 1/) keV with the deduced J/sup ..pi../ values in parentheses. Similarly, levels in /sup 56/Fe have been confirmed at 3388.4 (6/sup +//sub 1/), 3755.8 (6/sup +//sub 2/), 4700.6 (7/sup +//sub 1/), 5255.3 (8/sup +//sub 1/), and 5626.8 (8/sup +//sub 2/) keV, and the J/sup ..pi../ values in parentheses have been deduced. The angular distributions in conjunction with the associated attenuation factors were analyzed to yield multipole mixing ratios delta(E2/M1). The mean lifetimes tau of these states were also carefully measured by extrapolation to the detection threshold of the effective mean lifetimes extracted from Doppler-broadened line shapes obtained at four bombardment energies between 20.4 and 29.5 MeV. Values were obtained in /supmore » 56/Co for the following levels: 2282.6 keV (>2000 fs), 2371.9 keV (60 +- 30 fs), 3638.0 keV (80/sup +40//sub -//sub 30/ fs), 4180.2 keV (590 +- 60 fs), and 5274.6 keV (60/sup +40//sub -//sub 20/ fs); and in /sup 56/Fe values were found for levels at 3388.4 keV (>2000 fs), 3755.8 keV (180/sup +40//-/sub 30/ fs), 4700.6 keV (120 +- 40 fs), 5255.3 keV (500 +- 50 fs), and 5626.8 keV (100/sup +40/-/sub 20/ fs). For most of the transitions from the high-spin states in /sup 56/Co and /sup 56/Fe B(..lambda..) values were obtained. The results for /sup 56/Fe are compared with recent calculations based on the aligned coupling scheme. The results for /sup 56/Co are compared with other recent shell-model calculations. (AIP)« less

Authors:
; ;
Publication Date:
Research Org.:
Department of Chemistry, Washington University, St. Louis, Missouri 63130
OSTI Identifier:
7147308
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev., C; (United States); Journal Volume: 14:4
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COBALT 56; IRON 56; ALPHA REACTIONS; COMPOUND-NUCLEUS REACTIONS; IRON 54 TARGET; COINCIDENCE SPECTROMETRY; LIFETIME; MIXING RATIO; MULTIPOLARITY; PARITY; PROBABILITY; SPIN; ANGULAR DISTRIBUTION; EXCITATION FUNCTIONS; GAMMA RADIATION; GAMMA SPECTRA; MEV RANGE 10-100; NEUTRONS; PROTONS; ANGULAR MOMENTUM; BARYONS; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CHARGED-PARTICLE REACTIONS; COBALT ISOTOPES; CROSS SECTIONS; DAYS LIVING RADIOISOTOPES; DISTRIBUTION; ELECTROMAGNETIC RADIATION; ELECTRON CAPTURE RADIOISOTOPES; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; EVEN-EVEN NUCLEI; FERMIONS; HADRONS; INTERMEDIATE MASS NUCLEI; IONIZING RADIATIONS; IRON ISOTOPES; ISOTOPES; MEV RANGE; NUCLEAR REACTIONS; NUCLEI; NUCLEONS; ODD-ODD NUCLEI; PARTICLE PROPERTIES; RADIATIONS; RADIOISOTOPES; SPECTRA; STABLE ISOTOPES; TARGETS; 651523* - Nuclear Properties & Reactions, A=39-58, Experimental- Energy Levels & Transitions- (-1987); 651525 - Nuclear Properties & Reactions, A=39-58, Experimental- Nuclear Reactions & Scattering- (-1987)

Citation Formats

Sarantites, D.G., Urbon, J., and Rutledge, L.L. Jr. Transition rates of high-spin states in /sup 56/Co and /sup 56/Fe: Possible coexistence of prolate- and oblate-like configurations in /sup 56/Fe. [Angular distributions and excitation functions for /sup 54/Fe(. cap alpha. ,pn) and (. cap alpha. ,2p) reactions at 20. 4 to 29. 5 MeV]. United States: N. p., 1976. Web. doi:10.1103/PhysRevC.14.1412.
Sarantites, D.G., Urbon, J., & Rutledge, L.L. Jr. Transition rates of high-spin states in /sup 56/Co and /sup 56/Fe: Possible coexistence of prolate- and oblate-like configurations in /sup 56/Fe. [Angular distributions and excitation functions for /sup 54/Fe(. cap alpha. ,pn) and (. cap alpha. ,2p) reactions at 20. 4 to 29. 5 MeV]. United States. doi:10.1103/PhysRevC.14.1412.
Sarantites, D.G., Urbon, J., and Rutledge, L.L. Jr. Fri . "Transition rates of high-spin states in /sup 56/Co and /sup 56/Fe: Possible coexistence of prolate- and oblate-like configurations in /sup 56/Fe. [Angular distributions and excitation functions for /sup 54/Fe(. cap alpha. ,pn) and (. cap alpha. ,2p) reactions at 20. 4 to 29. 5 MeV]". United States. doi:10.1103/PhysRevC.14.1412.
@article{osti_7147308,
title = {Transition rates of high-spin states in /sup 56/Co and /sup 56/Fe: Possible coexistence of prolate- and oblate-like configurations in /sup 56/Fe. [Angular distributions and excitation functions for /sup 54/Fe(. cap alpha. ,pn) and (. cap alpha. ,2p) reactions at 20. 4 to 29. 5 MeV]},
author = {Sarantites, D.G. and Urbon, J. and Rutledge, L.L. Jr.},
abstractNote = {The decay properties of the high-spin states in /sup 56/Co and /sup 56/Fe have been investigated via the /sup 54/Fe(..cap alpha.., pn)/sup 56/Co*(..gamma..) and /sup 54/Fe(..cap alpha.., 2p)/sup 56/Fe*(..gamma..) reactions in the energy range 20.4 to 29.5 MeV. From measurements of excitation functions and angular distributions of individual ..gamma.. rays with a Ge(Li)--NaI(Tl) anti-Compton spectrometer, and from ..gamma gamma..-coincidence experiments, new levels in /sup 56/Co have been identified at 2282.6 (7/sup +//sub 1/), 2371.9 (6/sup +//sub 1/), 3638.0 (8/sup +//sub 1/), 4180.2 (9/sup +//sub 1/), and 5274.6 (10/sup +//sub 1/) keV with the deduced J/sup ..pi../ values in parentheses. Similarly, levels in /sup 56/Fe have been confirmed at 3388.4 (6/sup +//sub 1/), 3755.8 (6/sup +//sub 2/), 4700.6 (7/sup +//sub 1/), 5255.3 (8/sup +//sub 1/), and 5626.8 (8/sup +//sub 2/) keV, and the J/sup ..pi../ values in parentheses have been deduced. The angular distributions in conjunction with the associated attenuation factors were analyzed to yield multipole mixing ratios delta(E2/M1). The mean lifetimes tau of these states were also carefully measured by extrapolation to the detection threshold of the effective mean lifetimes extracted from Doppler-broadened line shapes obtained at four bombardment energies between 20.4 and 29.5 MeV. Values were obtained in /sup 56/Co for the following levels: 2282.6 keV (>2000 fs), 2371.9 keV (60 +- 30 fs), 3638.0 keV (80/sup +40//sub -//sub 30/ fs), 4180.2 keV (590 +- 60 fs), and 5274.6 keV (60/sup +40//sub -//sub 20/ fs); and in /sup 56/Fe values were found for levels at 3388.4 keV (>2000 fs), 3755.8 keV (180/sup +40//-/sub 30/ fs), 4700.6 keV (120 +- 40 fs), 5255.3 keV (500 +- 50 fs), and 5626.8 keV (100/sup +40/-/sub 20/ fs). For most of the transitions from the high-spin states in /sup 56/Co and /sup 56/Fe B(..lambda..) values were obtained. The results for /sup 56/Fe are compared with recent calculations based on the aligned coupling scheme. The results for /sup 56/Co are compared with other recent shell-model calculations. (AIP)},
doi = {10.1103/PhysRevC.14.1412},
journal = {Phys. Rev., C; (United States)},
number = ,
volume = 14:4,
place = {United States},
year = {Fri Oct 01 00:00:00 EDT 1976},
month = {Fri Oct 01 00:00:00 EDT 1976}
}