PROPERTIES OF THE 7.02-MeV AND 10.65-MeV LEVELS OF 20Ne

1967 ◽  
Vol 45 (6) ◽  
pp. 2133-2143 ◽  
Author(s):  
P. J. M. Smulders ◽  
C. Broude ◽  
A. E. Litherland
Keyword(s):  
Angular Correlation ◽  
Excellent Agreement ◽  
Amplitude Ratio ◽  
Branching Ratio ◽  
Rotational Model ◽  
Particle Counter ◽  
Correlation Techniques

The 7.02-MeV level of 20Ne has been studied by the I2C(12C, αγ)20Ne reaction, using angular correlation techniques, with a particle counter and six Nal crystals. The spin and parity of this level were determined to be 4−. The branching ratio of the decays to the 5.63, 4.97, and 4.25 MeV levels was found to be 22:65:13. The transition to the 5.63-MeV state (4− → 3−) is an almost pure E2 transition with an M1/E2 amplitude ratio of 0.03 ± 0.03. The branching ratio of the E2 transitions to the 5.63-MeV 3− level and the 4.97-MeV 2− level is in excellent agreement with predictions from the rotational model and also with SU3 calculations.Similar measurements on the 10.65-MeV level in 20Ne support the tentative 6− assignment to this level.

Studies of continuum states using angular correlation techniques (I). 20Ne

1979 ◽  
Vol 330 (2-3) ◽  
pp. 452-476 ◽  
Author(s):  
K.C. Young ◽  
R.W. Zurmühle ◽  
J.M. Lind ◽  
D.P. Balamuth
Keyword(s):  
Angular Correlation ◽  
Continuum States ◽  
Correlation Techniques

GAMMA-RAY ANGULAR CORRELATION MEASUREMENTS IN Ne22

1964 ◽  
Vol 42 (6) ◽  
pp. 1300-1310 ◽  
Author(s):  
C. Broude ◽  
M. A. Eswaran
Keyword(s):  
Excited State ◽  
Angular Correlation ◽  
Gamma Ray ◽  
Amplitude Ratio ◽  
Spin Assignment ◽  
Primary Radiation ◽  
Angular Correlations ◽  
First Excited State

Coincidence gamma-ray angular correlations of the cascade decays from the 3.34- and 4.47-Mev states in Ne22 through the first excited state have been measured. The levels were excited by the reaction F19 (α, p)Ne22. The correlations give an unambiguous spin assignment of 4 to the 3.34-Mev state; the analysis of the correlations from the 4.47-Mev state is not unique, allowing spin 2 or 3. The quadrupole-to-dipole amplitude ratio for the primary radiation is −0.11 ± 0.03 or −1.07 ± 0.10, respectively, for the spin-2 and spin-3 assignments.

Study of levels in 24Mg

1968 ◽  
Vol 46 (12) ◽  
pp. 1381-1401 ◽  
Author(s):  
R. W. Ollerhead ◽  
J. A. Kuehner ◽  
R. J. A. Levesque ◽  
E. W. Blackmore
Keyword(s):  
Angular Correlation ◽  
Beta Decay ◽  
Rotational Band ◽  
Ground State ◽  
Present Experiment ◽  
Gamma Ray ◽  
Axially Symmetric ◽  
Excitation Energies ◽  
Rotational Model ◽  
Rotational Bands

Nineteen levels in 24Mg have been studied utilizing the reaction 12C(16O, αγ)24Mg. Angular correlation measurements have established the spins and parities of levels at excitation energies of 7.35, 7.56, 7.62, 8.44, 8.65, 9.00, 9.15, and 10.1 MeV as 2+, 1−, 3−, 1−, 2+, 2+, 1−, and 0+ respectively. Levels at 8.12 and 13.18 MeV have been identified as the 6+ and 8+ members of the K = 0 ground-state rotational band; levels at 7.81 and 9.52 MeV have been identified as the 5+ and 6+ members of the K = 2 rotational band based on the 2+ level at 4.23 MeV. The existence of doublets has been established at excitation energies of 8.44 and 9.52 MeV; in each case, one member of the doublet is populated in the beta decay of 24Al, and the present experiment indicates that these two levels have spin and parity 4+. Assignments are also suggested for levels at 7.75 MeV (1+) and 8.36 MeV (2+). Gamma-ray spectra have been obtained for levels at 8.86, 9.28, and 9.46 MeV. The properties of levels assigned to rotational bands are compared to the predictions of the rotational model for an axially symmetric nucleus.

NEUTRON-CAPTURE γ-RAY STUDIES IN 50Cr(n, γ)51Cr

1966 ◽  
Vol 44 (9) ◽  
pp. 2111-2130 ◽  
Author(s):  
G. A. Bartholomew ◽  
E. D. Earle ◽  
M. R. Gunye
Keyword(s):  
Angular Correlation ◽  
Neutron Capture ◽  
Decay Scheme ◽  
Γ Ray ◽  
Correlation Techniques

Level energies and details of the γ-ray decay scheme in 51Cr are determined by Ge(Li) spectrometer and angular correlation techniques. Spin 3/2 is assigned to levels at 0.748, 1.898, 2.893, 3.125, and 3.769 MeV. A level at 776 keV, for which spin 1/2– is favored, may account for the anomalous lifetime previously reported for the 748-keV γ ray in 51Cr.

THE 199Hg(n, γ)200Hg REACTION WITH THERMAL NEUTRONS

1967 ◽  
Vol 45 (4) ◽  
pp. 1517-1540 ◽  
Author(s):  
G. A. Bartholomew ◽  
S. I. H. Naqvi ◽  
M. R. Gunye ◽  
E. D. Earle
Keyword(s):  
Thermal Neutron ◽  
Angular Correlation ◽  
Level Scheme ◽  
Neutron Capture ◽  
Gamma Ray ◽  
Germanium Detector ◽  
Thermal Neutrons ◽  
Thermal Neutron Capture ◽  
Γ Rays ◽  
Correlation Techniques

Thermal neutron-capture γ rays from 199Hg(n, γ)200Hg were studied with a lithium germanium detector and with angular correlation techniques. Gamma-ray and level energies were determined with accuracies of at best ±3 keV. Spin 0 for the capturing state was confirmed and levels at 1 569, 2 060, 2 369, 2 640, 3 186, 3 269, 3 289, 3 351 keV were assigned spin 1. The 200Hg level scheme is discussed.

A Measurement of the Branching Ratio for the Gamma Transitions from the 4·235 MeV Level of 24Mg

1973 ◽  
Vol 26 (2) ◽  
pp. 257 ◽  
Author(s):  
D Branford
Keyword(s):  
Shell Model ◽  
Branching Ratio ◽  
Rotational Model ◽  
Model Calculations ◽  
Gamma Transitions ◽  
Bombarding Energy

The branching ratio for the y-transitions from the 4�235 MeV level of 24Mg has been measured following a study of the 23Na(p, y) resonances at 1021 and 1416 keV bombarding energy. The result, which is considerably more accurate than those reported previously, is compared with the predictions of the rotational model and shell model calculations.

scholarly journals THE CP-VIOLATING ASYMMETRY IN η → π+ π-e+e-

2002 ◽  
Vol 17 (24) ◽  
pp. 1583-1588 ◽  
Author(s):  
DAO-NENG GAO
Keyword(s):  
Angular Correlation ◽  
Upper Bound ◽  
Branching Ratio ◽  
Type Operator ◽  
Cp Asymmetry ◽  
The Future ◽  
The Asymmetry ◽  
O 10 ◽  
Magnetic Amplitude

We study the CP-violating asymmetry [Formula: see text], which arises, in η → π+π-e+e-, from the angular correlation of the e+e- and π+ π- planes due to the interference between the magnetic and electric decay amplitudes. With the phenomenologically determined magnetic amplitude and branching ratio as input, the asymmetry, induced by the electric bremsstrahlung amplitude through the CP-violating decay η → π+π-, and by an unconventional tensor type operator, has been estimated respectively. The upper bound of [Formula: see text] from the former is about 10-3, and the asymmetry from the latter might be up to O(10-2). One can therefore expect that this CP asymmetry would be an interesting CP-violating observable for the future precise measurements in the η factories.

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