Gamma decay of the T = 3/2 states in 25Al

1977 ◽  
Vol 55 (3) ◽  
pp. 206-211 ◽  
Author(s):  
D. W. O. Rogers ◽  
N. Anyas-Weiss ◽  
S. P. Dolan ◽  
N. A. Jelley ◽  
T. K. Alexander
Keyword(s):  
Angular Distribution ◽  
Shell Model ◽  
Poor Agreement ◽  
Model Calculations ◽  
Upper Level ◽  
Gamma Decay

The decay of the two lowest T = 3/2 levels at Ex = 7901 ± 2 and 7969 ± 2 keV in 25Al have been investigated using the 24Mg(p,γ)25Al reaction. Angular distribution and radiative yield measurements rigorously assign J = 5/2 to the lower level. J = 3/2 is consistent with the results for the upper level although J = 5/2 and 7/2 are also admissible. Any possibility of an inversion of these states as compared to the first two levels in 25Na is excluded by these results. The measured radiative yields are ωγ = 0.25 ± 0.06 and 0.40 ± 0.09 eV for the lower and upper resonances respectively. Two previously reported γ-decay branches from the upper resonance were found to be nonresonant. Comparisons to recent shell model calculations show poor agreement.

scholarly journals p-Wave Strength in the Low-energy 7Li(p,?0)8Be Cross Section

1995 ◽  
Vol 48 (5) ◽  
pp. 813 ◽  
Author(s):  
FC Barker
Keyword(s):  
Angular Distribution ◽  
Shell Model ◽  
Cross Section ◽  
Low Energy ◽  
P Wave ◽  
Model Calculations ◽  
Energy Data

Recent fits to low-energy 7Li(p, "Yo)8Be angular distribution and analysing power data suggested a large p-wave strength. It is shown that acceptable fits to the data can be obtained by attributing the p-wave Ml contributions to the tails of the 17 �64 and 18 �15 MeV 1+ levels of 8Be, with p-wave strengths much less than those obtained previously, but only if some of the spectroscopic amplitudes have signs opposite to those suggested by shell model calculations and/or a fit to higher-energy data.

The electromagnetic decay of the T = 3/2 states in19F

1976 ◽  
Vol 54 (9) ◽  
pp. 938-943 ◽  
Author(s):  
D. W. O. Rogers ◽  
A. L. Carter ◽  
T. J. M. Symons ◽  
S. P. Dolan ◽  
N. Anyas-Weiss ◽  
...  
Keyword(s):  
Shell Model ◽  
Weak Decay ◽  
Model Calculations ◽  
Electromagnetic Decay ◽  
Decay Modes ◽  
Upper Limits ◽  
Gamma Decay

The gamma-decay modes of the first two T = 3/2 levels in 19F at Ex = 7538 ± 2 and 7659 ± 2 keV have been studied at resonances in the 15N(α, γ)19F reaction at Eα = 4.465 and 4.618 MeV. Several weak decay branches have been seen: 7.54 → 5.11 MeV, 1.7 ± 0.4%; 7.54 → 1.35 MeV, 1.2 ± 0.4%; 7.66 → 4.55 MeV, 5.1 ± 0.3%; 7.66 → 5.11 MeV, 5.9 ± 0.5%. Comparison with (sd)3 shell model calculations indicate that the 4.55 and 5.11 MeV levels can be associated with the second and third calculated 5/2+ states. Using the DSAM, upper limits have been set on several lifetimes: 4377 ± 1 keV, < 22 fs; 4548 ± 2 keV, < 50 fs; 5105 ± 2 keV, < 30 fs.

Radiative decay of unbound levels in 14N

1985 ◽  
Vol 63 (9) ◽  
pp. 1141-1147 ◽  
Author(s):  
C. Pruneau ◽  
M. B. Chatterjee ◽  
C. Rangacharyulu ◽  
C. St-Pierre
Keyword(s):  
Shell Model ◽  
Radiative Decay ◽  
Branching Ratios ◽  
Gamma Transition ◽  
Model Calculations ◽  
Mixing Ratios ◽  
Decay Properties ◽  
Decay Widths ◽  
Gamma Decay ◽  
Good Agreement

The gamma decay properties of 10.43-, 10.1-, 9.7-, 9.51-, and 8.91-MeV levels are studied by the 13C(p, γ) reaction. The natural widths, gamma decay widths, branching ratios, and multipole mixing ratios are determined. The gamma branching ratios are generally in good agreement with earlier works. However, it is found that the previous (p, γ) measurements overestimated the gamma transition strengths. The results are compared with shell model calculations. Also, a phenomenological description is attempted for a few 14N levels.

Grid Lifetime Measurements and Shell Model Calculations In 59Ni

1991 ◽  
Author(s):  
S. Ulbig ◽  
K. P. Lieb ◽  
H. G. Börner ◽  
S. J. Robinson ◽  
J. G. L. Booten
Keyword(s):  
Shell Model ◽  
Lifetime Measurements ◽  
Model Calculations

Low-lying Negative-parity Levels of 17N and 18N

1984 ◽  
Vol 37 (1) ◽  
pp. 17 ◽  
Author(s):  
FC Barker
Keyword(s):  
Shell Model ◽  
Weak Coupling ◽  
Coupling Model ◽  
Negative Parity ◽  
Positive Parity ◽  
Model Calculations

On the basis of a weak-coupling model, adjustments are made to the interactions used in the full shell model calculations of Millener in order to fit the experimental energies of the low-lying negativeparity levels of 16N and of the low-lying positive-parity levels of 180 and 190 . The predicted energies of the low-lying negative-parity levels of 17N then agree better with experiment, while those for 18N lead to suggested spin assignments for the observed levels.

scholarly journals Study of nuclei around Z = 28 by large-scale shell model calculations

2013 ◽  
Vol 445 ◽  
pp. 012028 ◽  
Author(s):  
Y Tsunoda ◽  
T Otsuka ◽  
N Shimizu ◽  
M Honma ◽  
Y Utsuno
Keyword(s):  
Shell Model ◽  
Large Scale ◽  
Model Calculations
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