scholarly journals Gamma-ray Studies using a Solid Argon Target: Properties of States in 40K and 40Ar

1979 ◽  
Vol 32 (3) ◽  
pp. 195 ◽  
Author(s):  
DJ Beale ◽  
AR Poletti ◽  
JR Southon
Keyword(s):  
Angular Distribution ◽  
Doppler Shift ◽  
Weak Coupling ◽  
Gamma Ray ◽  
Interaction Model ◽  
Substantial Agreement ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Coupling Calculation ◽  
Solid Argon

The Doppler shift attenuation method was used to deduce lifetimes of levels in 40 Ar and 4�K populated by the reactions 40 Ar(p, n)4�K and 40 Ar(p, p')40 Ar. Spins and mixing ratios in 4�K were also deduced from angular distribution measurements. The target used was solid argon at a temperature of 66 K. Substantial agreement with other recent work has been found. The results are interpreted using a weak coupling calculation and a simple t5 function interaction model.

Gamma rays from the 3702 keV level in 25Al

1969 ◽  
Vol 47 (23) ◽  
pp. 2609-2619 ◽  
Author(s):  
N. Anyas-Weiss ◽  
A. E. Litherland
Keyword(s):  
Angular Distribution ◽  
Lower Limit ◽  
Gamma Rays ◽  
Doppler Shift ◽  
Gamma Ray ◽  
Decay Modes ◽  
Mirror Nucleus ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Decay Gamma

The decay modes of the 7/2−, 3702 keV level in 25Al have been studied at the Ep = 1490 keV resonance in the 24Mg(p,γ)25Al reaction. The decay gamma rays were observed using a 25 cm3 Ge(Li) detector. A previously unreported 2% transition from the resonance to the level at 2723 keV has been observed. The angular distribution of this gamma ray admits only a spin of 7/2 for the 2723 keV level. The lifetime of the 2723 keV level was measured with the Doppler shift attenuation method (DSAM) at the 1660 keV resonance and was found to be [Formula: see text]. The lifetime of the 5/2+, 1790 keV level has been measured using the DSAM and has been found to be [Formula: see text]. From Doppler shift measurements a lower limit for the lifetime of the 3/2+, 945 keV level of [Formula: see text] was obtained. From angular distribution measurements at the Ep = 1490 keV resonance, the following multipole mixing ratios have been measured: δ(R → 0) = 0.00 ± 0.02; δ(R → 1790) = −0.02 ± 0.02; δ(R → 2723) = 0.15 ± 0.30; [Formula: see text]; δ(1790 → 945) = −0.15 ± 0.05; δ(945 → 0) = 0.35 ± 0.10 or 1.7 ± 0.2; δ(945 → 451) = −0.15 ± 0.05 or 2.6 ± 0.4. Comparisons with data in the mirror nucleus 25Mg have been made.

Gamma-Ray Angular Distribution, Angular Correlation, Linear Polarization, and Doppler-Shift Attenuation Measurements in the 46Ti(α, nγ) 49Cr Reaction

1977 ◽  
Vol 43 (3) ◽  
pp. 741-754 ◽  
Author(s):  
Jirohta Kasagi ◽  
Shigeru Nakagawa ◽  
Norio Kishida ◽  
Yuichi Iritani ◽  
Hajime Ohnuma
Keyword(s):  
Angular Distribution ◽  
Angular Correlation ◽  
Linear Polarization ◽  
Doppler Shift ◽  
Gamma Ray ◽  
Doppler Shift Attenuation

Lifetime measurements of the six lowest lying levels in 35Cl

1969 ◽  
Vol 47 (12) ◽  
pp. 1295-1306 ◽  
Author(s):  
F. Ingebretsen ◽  
T. K. Alexander ◽  
O. Häusser ◽  
D. Pelte
Keyword(s):  
Gamma Rays ◽  
Doppler Shift ◽  
Gamma Ray ◽  
Level Structure ◽  
Branching Ratios ◽  
Distance Method ◽  
Lifetime Measurements ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Recoil Distance

The energies, gamma-ray branching ratios, and mean nuclear lifetimes of the six lowest lying levels in 35Cl have been measured. Gamma rays following the reaction 32S(α,pγ)35Cl were studied using two Ge(Li) detectors with 15-cm3 and 40-cm3 active volumes respectively. The lifetimes of the five lowest lying levels were measured using the Doppler shift attenuation method, with the results: 1219 keV, [Formula: see text]; 1763 keV, 0.55 ± 0.15 ps; 2646 keV, 0.30 ± 0.09 ps; 2695 keV, <0.03 ps; and 3003 keV, <0.05 ps. The lifetime of the 3163-keV level was measured to be 60 ± 7 ps, using a recoil distance method. The level structure is discussed taking into account known lifetimes, spins, parities, and gamma-ray mixing ratios.

Gamma-Ray Linear Polarization and Angular Distribution Formulas in Terms of Phase-Defined Reduced Matrix Elements

1971 ◽  
Vol 49 (3) ◽  
pp. 328-351 ◽  
Author(s):  
P. Taras
Keyword(s):  
Angular Distribution ◽  
Linear Polarization ◽  
Gamma Ray ◽  
Polarization Measurement ◽  
Recent Measurement ◽  
Full Potential ◽  
Matrix Elements ◽  
Mixing Ratios ◽  
Nuclear Models

Gamma-ray linear polarization and angular distribution formulas are presented in terms of the phase-defined reduced matrix elements of Rose and Brink. In particular, the mixing ratios are phase consistently related to reduced matrix elements of interaction multipole operators which are also well defined in phase. The mixing ratios extracted from the measurements of gamma-ray angular distribution and linear polarization can then be compared in both magnitude and sign with the predictions of nuclear models. The full potential of a gamma-ray linear polarization measurement is demonstrated by the discussion of a recent measurement.

Coulomb excitation of 133Cs with protons

1985 ◽  
Vol 63 (4) ◽  
pp. 483-487 ◽  
Author(s):  
K. P. Singh ◽  
D. C. Tayal ◽  
B. K. Arora ◽  
T. S. Cheema ◽  
H. S. Hans
Keyword(s):  
Angular Distribution ◽  
Gamma Ray ◽  
Transition Probabilities ◽  
Coulomb Excitation ◽  
Spin Assignment ◽  
Thick Target ◽  
Angular Distributions ◽  
Distribution Data ◽  
Mixing Ratios ◽  
Reduced Transition Probabilities

Protons of energy 3.2–4.2 MeV have been used to Coulomb excite the states in 133Cs. The thick-target gamma-ray yields and the angular distributions were measured using a 50 cm3 Ge(Li) detector. The measurements were used to extract the reduced transition probabilities, B (E2) and B(M1), and multipole mixing ratios (δ) for the various transitions. A spin assignment has been made to the 871.8 keV level on the basis of angular distribution data. The results obtained have been compared with those of other authors.

LIFETIME OF THE 3.85-MEV LEVEL IN C13

1962 ◽  
Vol 40 (6) ◽  
pp. 769-774 ◽  
Author(s):  
J. J. Simpson ◽  
F M. A. Clark ◽  
A. E. Litherland
Keyword(s):  
Relative Intensity ◽  
Doppler Shift ◽  
Weak Coupling ◽  
Theoretical Calculations ◽  
Ground Level ◽  
Coupling Model ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method ◽  
Strength Formula ◽  
Measured Transition

The lifetime of the 3.85-Mev level in C13 has been measured by the Doppler shift attenuation method and has been found to be [Formula: see text] second. This lifetime together with the (9.3 ± 2.0) × 10−3 relative intensity of the E2 branch from this level implies a strength [Formula: see text] in Weisskopf units for this transition. It is also found that the primarily M2 transition to the ground level of C13 has [Formula: see text] and the E1 transition to the 3.68-Mev level has [Formula: see text]. The measured transition strengths are compared with recent theoretical calculations based upon the weak-coupling model.

LIFETIMES OF THE LOW-LYING LEVELS OF 20Ne

1965 ◽  
Vol 43 (1) ◽  
pp. 82-95 ◽  
Author(s):  
H. C. Evans ◽  
M. A. Eswaran ◽  
H. E. Gove ◽  
A. E. Litherland ◽  
C. Broude
Keyword(s):  
Doppler Shift ◽  
Gamma Ray ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method

The lifetimes of the 1.63-, 4.25-, 4.97-, and 5.63-MeV levels in 20Ne have been measured by the Doppler shift attenuation method. The lifetimes in picoseconds are 1.23 ± 0.12, 0.134 ± 0.012, [Formula: see text], and 0.35 ± 0.075 respectively. The reduced widths in Weisskopf units for the 1.63-, 2.62-, 3.34-, and 4.00-MeV gamma-ray transitions, together with the gamma-ray multipolarities, are [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text].

Study of the Decay of the 3.696 MeV Level in 25Al

1971 ◽  
Vol 49 (4) ◽  
pp. 467-474 ◽  
Author(s):  
G. J. McCallum ◽  
R. J. Sparks ◽  
G. E. Coote ◽  
K. P. Pohl
Keyword(s):  
Doppler Shift ◽  
Gamma Ray ◽  
Branching Ratios ◽  
Angular Distributions ◽  
Doppler Shift Attenuation ◽  
Doppler Shift Attenuation Method

The decay of the 3.696 MeV level in 25Al has been studied by means of the 24Mg(p,γ)25Al reaction at the 1.49 MeV resonance. Gamma-ray branching ratios, direct angular distributions, and lifetimes determined by the Doppler shift attenuation method are reported.

Gamma-ray induced Doppler shift attenuation after (n, γ) reactions in Si and Ti

1997 ◽  
Vol 385 (1) ◽  
pp. 100-107 ◽  
Author(s):  
T Kahn ◽  
T von Egidy ◽  
F.J Hartmann ◽  
J Ott ◽  
M Jentschel
Keyword(s):  
Doppler Shift ◽  
Gamma Ray ◽  
Doppler Shift Attenuation

The 7/2− Doublet in 55Fe

1975 ◽  
Vol 53 (23) ◽  
pp. 2631-2638 ◽  
Author(s):  
B. C. Robertson ◽  
M. Micklinghoff ◽  
B. Castel
Keyword(s):  
Doppler Shift ◽  
Model Analysis ◽  
Experimental Information ◽  
Doppler Shift Attenuation ◽  
Coupling Calculation

An investigation of the Jπ = 7/2− states at 1316 and 1408 keV excitation in 55Fe is presented as a test of the coexistence of particle and hole states in that nucleus. The lifetimes were measured using the solid stopper Doppler shift attenuation technique, yielding values of [Formula: see text] and τ > 4 ps for the 1316 and 1408 keV levels respectively. The 1408 → 1316 keV branch was determined to be 2.5 ± 0.5%. The results are compared with other available experimental information and with the predictions of a quasiparticle–core coupling calculation. The model analysis indicates very limited mixing of particle and hole configurations.

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