scholarly journals Properties of the Lowest T = 2 State in 24Mg

1977 ◽  
Vol 30 (4) ◽  
pp. 407 ◽  
Author(s):  
JCP Heggie ◽  
HH Bolotin
Keyword(s):  
Simultaneous Measurement ◽  
Branching Ratios ◽  
Total Width ◽  
Excitation Energies ◽  
Particle Decays

The lowest T = 2 state in 24Mg was investigated using the 23Na(p, )I)24Mg reaction. The excitation energies of this level and of the two lower T = 1 levels subsequently fed in its )I-ray decay were determined to be 15436�4�0�6, 10711�7�0�8 and 9967�S�0�5keV respectively. Accurate )I-ray decay branching ratios of these three levels were obtained, and a comparison was made with the analogous AT = 1 transitions in 24Na. From a simultaneous measurement of the radiative strength and the 23Na(p, (Xl )I)2�Ne strength, partial widths were deduced for the )I-ray, proton and (X-particle decays of the T = 2 level. The total width of the level was found to be 1� 02 � O� 34 keV.

Mesures de Rapports d'Embranchement et de Vies Moyennes dans 30Si

1972 ◽  
Vol 50 (3) ◽  
pp. 278-286 ◽  
Author(s):  
A. Gallmann ◽  
F. Haas ◽  
M. Toulemonde
Keyword(s):  
Shell Model ◽  
Gamma Rays ◽  
Doppler Shift ◽  
Branching Ratios ◽  
Matrix Elements ◽  
Excitation Energies ◽  
Doppler Shift Attenuation ◽  
Annular Detector ◽  
Γ Rays

Gamma rays from the decay of 30Si levels with excitation energies less than 6.0 MeV have been studied by the 27Al(α, pγ)30Si reaction. The γ rays were detected in a Ge(Li) detector in coincidence with protons observed in an annular detector placed at 180°. Branching ratios and lifetimes have been extracted. The lifetimes have been measured by the Doppler-shift attenuation method.The electromagnetic matrix elements for some of the observed levels were compared with recent many-particle shell model and core-coupling calculations.

Mean Lives, Branching Ratios, and Excitation Energies of Levels inF20below 4 MeV

1969 ◽  
Vol 186 (4) ◽  
pp. 1167-1173 ◽  
Author(s):  
R. L. Hershberger ◽  
M. J. Wozniak ◽  
D. J. Donahue
Keyword(s):  
Branching Ratios ◽  
Excitation Energies

scholarly journals RARE t-QUARK DECAYS $t\to c\,l_j^{+}l_k^{-}$, $t\to c\,\tilde\nu_j\nu_k$ IN THE MINIMAL FOUR-COLOR SYMMETRY MODEL

2005 ◽  
Vol 20 (10) ◽  
pp. 755-767 ◽  
Author(s):  
P. YU. POPOV ◽  
A. D. SMIRNOV
Keyword(s):  
Charged Lepton ◽  
Branching Ratios ◽  
Mass Splitting ◽  
Higgs Mechanism ◽  
Total Width ◽  
Mixing Angle ◽  
Color Symmetry ◽  
Symmetry Model ◽  
Scalar Leptoquark ◽  
Quark Decays

The rare t-quark decays [Formula: see text], [Formula: see text] via the scalar leptoquark doublets are investigated in the minimal four-color symmetry model with the Higgs mechanism of the quark–lepton mass splitting. The partial widths of these decays are calculated and the total width of the charged lepton mode [Formula: see text] and the total width of the neutrino mode [Formula: see text] are found. The corresponding branching ratios are shown to be [Formula: see text] for the scalar leptoquark masses mS = 180–250 GeV and for the appropriate values (sin β≈ 0.2) of the mixing angle of the model. The search for such decays at LHC may be of interest.

The 23Na(α,γ)27Al reaction. A survey of the reaction and some properties of the 27Al nucleus

1969 ◽  
Vol 47 (15) ◽  
pp. 1545-1555 ◽  
Author(s):  
H. Röpke ◽  
N. Anyas-Weiss
Keyword(s):  
Excitation Energy ◽  
Excited States ◽  
Bound States ◽  
Branching Ratios ◽  
Angular Distributions ◽  
Particle Capture ◽  
Excitation Energies ◽  
Decay Modes ◽  
Γ Ray ◽  
27Al Reaction

The 23Na(α,γ) reaction has been studied in the region Eα = 2–3 MeV. The γ-ray spectra from a total of 16 resonances have been surveyed using a 40 cm3 Ge(Li) detector. Excitation energies, γ-ray decay modes, branching ratios, and γ-ray yields of these resonances are given. Below Eα = 2.7 MeV, all resonances have [Formula: see text] and the α-particle capture proceeds with [Formula: see text]. The resonances at Eα = 2.696 and 2.797 MeV have strong branches to the Jπ = 11/2+ state in 27Al at 4.509 MeV excitation energy. A measurement of γ-ray angular distributions at these resonances yields Jπ(2.969 res.) = 9/2+, 11/2 and Jπ(2.797 res.) = 9/2+ for the resonances, and Jπ(5.671) = 9/2+, 7/2 and Jπ(4.580) = 9/2+, 7/2 for bound states in 27Al. Investigation of this latter level at the Ep = 2.114 MeV resonance in the 26Mg(p,γ)27Al reaction restricts the spin to 7/2. New excited states in 27Al were found at Ex = 5.504, 5.671, and 7.815 MeV. A state at Ex = 5.499 MeV was confirmed.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

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