Level structure of /sup 57/Mn from a /sup 55/Mn(t,p)/sup 57/Mn reaction study and a mixed-configuration shell model calculation

Journal Article · Sun May 01 00:00:00 EDT 1977 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.15.1708· OSTI ID:7097375

Mateja, J F; Browne, C P; Moss, C E; McGrory, J B

Twenty-seven levels below 2.7 MeV excitation in /sup 57/Mn have been identified using the /sup 55/Mn(t,p)/sup 57/Mn reaction. Of these levels 18 were not reported in an earlier /sup 54/Cr(..cap alpha..,p)/sup 57/Mn and /sup 54/Cr(..cap alpha..,p..gamma..)/sup 57/Mn work. From a distorted-wave Born approximation analysis of the angular distributions for states up to 2.1 MeV, the J = 5/2 ground state spin was confirmed and J = 5/2 and (11/2) spin assignments were made to levels at 1837 and 1916 keV, respectively. Further, the L values extracted from the /sup 55/Mn(t,p)/sup 57/Mn angular distributions were consistent with all of the tentative spin assignments given in the /sup 54/Cr(..cap alpha..,p..gamma..)/sup 57/Mn study. The ground state Q value is 7438.2 +- 3.6 keV. A shell model calculation for /sup 57/Mn was also attempted. A /sup 48/Ca core was assumed with the valence protons restricted to the f/sub 7///sub 2/ subshell and the valence neutrons allowed to occupy the 2p/sub 3///sub 2/, 1f/sub 5///sub 2/, and 2p/sub 1///sub 2/ subshells. The agreement between the experimental and predicted level schemes is extremely good to 2 MeV. Above 2 MeV where core and valence particle excitations are expected, the model begins to break down since these configurations were not included in the model's configuration space. The shell model wave functions were also used to calculate spectroscopic amplitudes for two nucleon transfer reactions. The quantitative agreement between the predicted strengths and the strengths extracted from the experiment for the /sup 55/Mn(t,p)/sup 57/Mn reaction is satisfactory.

• Research Organization: University of Notre Dame, Notre Dame, Indiana 46556
• OSTI ID: 7097375
• Journal Information: Phys. Rev., C; (United States), Vol. 15:5
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
MANGANESE 57
MANGANESE 55 TARGET
TRITON REACTIONS
STRIPPING
ANGULAR DISTRIBUTION
DWBA
PARITY
Q-VALUE
SHELL MODELS
SPIN
DIFFERENTIAL CROSS SECTIONS
MEV RANGE 10-100
PROTONS
TWO-NUCLEON TRANSFER REACTIONS
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BORN APPROXIMATION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
FERMIONS
HADRONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MANGANESE ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MINUTES LIVING RADIOISOTOPES
MULTI-NUCLEON TRANSFER REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
TARGETS
TRANSFER REACTIONS
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