Properties of Excited States ofP31. II. Gamma-Ray Angular Distributions and Correlations

1963 ◽  
Vol 131 (2) ◽  
pp. 787-804 ◽  
Author(s):  
Gale I. Harris ◽  
L. W. Seagondollar
Keyword(s):  
Excited States ◽  
Gamma Ray ◽  
Angular Distributions

Investigation of level properties of 139La

1979 ◽  
Vol 57 (11) ◽  
pp. 1940-1948 ◽  
Author(s):  
R. G. Kulkarni ◽  
K. Andhradev
Keyword(s):  
Angular Distribution ◽  
Excited States ◽  
Gamma Ray ◽  
Transition Probabilities ◽  
Coulomb Excitation ◽  
Theoretical Calculations ◽  
Angular Distributions

The excited states of 139La up to 1800 keV were studied by means of Coulomb excitation of 139La with protons varying in energy from 4.0 to 5.5 eV. The gamma-ray yields and angular distributions were measured with a Ge(Li) detector. The levels at 1715.0 and 1767.2 keV were Coulomb excited newly. The results of gamma-ray angular distribution measurements establish spin values of 3/2+, 9/2+, 7/2+, 5/2+, and 3/2+ for the 830, 1219.1, 1536.3, 1715.0, and 1767.2 keV levels, respectively. The reduced E2 and M1 transition probabilities were obtained for 11 transitions. The results were compared with the available theoretical calculations.

Gamma-Ray Angular Correlations and Lifetime Measurements for Some Excited States ofNe21

1969 ◽  
Vol 186 (4) ◽  
pp. 1174-1188 ◽  
Author(s):  
J. G. Pronko ◽  
C. Rolfs ◽  
H. J. Maier
Keyword(s):  
Excited States ◽  
Gamma Ray ◽  
Lifetime Measurements ◽  
Angular Correlations

scholarly journals Precision measurements on oxygen formation in stellar helium burning with gamma-ray beams and a Time Projection Chamber

2021 ◽  
Author(s):  
Robin Smith ◽  
Moshe Gai ◽  
Sarah Stern ◽  
Deran Schweitzer ◽  
Mohammad Ahmed
Keyword(s):  
Time Projection Chamber ◽  
Gamma Ray ◽  
Nuclear Reactions ◽  
Angular Distributions ◽  
Helium Burning ◽  
Low Energies ◽  
Important Input ◽  
Novel Method ◽  
Time Projection ◽  
First Time

Abstract Stellar Evolution theory relies on our knowledge of nuclear reactions, with the carbon/oxygen (C/O) ratio, at the end of helium burning, being the single most important input. However, the C/O ratio is still not known with sufficient accuracy, due to large uncertainties in the cross section for the fusion of helium with 12C to form 16O, denoted as the 12C(α,γ)16O reaction. We present initial results at moderately low energies using a novel method, which is significantly different from the experimental efforts of the past four decades. Precise angular distributions of the 12C(α,γ)16O reaction were obtained by measuring the inverse 16O(γ,α)12C reaction with gamma-beams and a Time Projection Chamber detector. These allowed us to measure, for the first time, the interference angle of the l = 1 and 2 partial waves contributing to this reaction (φ12), which agrees with predictions based on the unitarity of the scattering matrix.

Compound Inelastic Nucleon and Gamma-Ray Angular Distributions for Even- and Odd-Mass Nuclei

1966 ◽  
Vol 38 (1) ◽  
pp. 143-186 ◽  
Author(s):  
ERIC SHELDON ◽  
DOUGLAS M. VAN PATTER
Keyword(s):  
Gamma Ray ◽  
Angular Distributions

Study of the 14N(d, d)14N and 14N(d, p)15N angular distributions and excited states of 15N

1969 ◽  
Vol 125 (3) ◽  
pp. 568-584 ◽  
Author(s):  
H. Beaumevieille ◽  
M. Lambert ◽  
M. Yaker ◽  
A. Amokrane ◽  
Nguyen Van Sen
Keyword(s):  
Excited States ◽  
Angular Distributions

Nuclear g Factors in 55Fe

1973 ◽  
Vol 51 (7) ◽  
pp. 707-712 ◽  
Author(s):  
P. G. Kerr ◽  
A. W. Gibb ◽  
J. A. Cameron
Keyword(s):  
Excited States ◽  
Gamma Rays ◽  
Target Material ◽  
Internal Field ◽  
Angular Distributions ◽  
Mixing Ratios ◽  
Decay Gamma ◽  
G Factors

The (α,n) reaction on natural chromium has been used to study levels in 55Fe up to 2.5 MeV excitation. Intensities and angular distributions of the decay gamma rays were measured, yielding branching and E2/M1 mixing ratios. In a magnetized target of the alloy Cr20Fe80, the rotation of the angular distributions was observed. Using recently determined lifetimes for the excited states and the average internal field of 277 kOe measured in the target material by Mössbauer absorption, the following g factors are obtained:[Formula: see text]

High spin states in 96Tc populated through the (α,n) reaction

1980 ◽  
Vol 58 (2) ◽  
pp. 174-190 ◽  
Author(s):  
H. A. Mach ◽  
M. W. Johns ◽  
J. V. Thompson
Keyword(s):  
Theoretical Model ◽  
High Spin ◽  
Spin Structure ◽  
Gamma Ray ◽  
Angular Distributions ◽  
Spin States ◽  
High Spin States ◽  
Gamma Coincidence ◽  
Electron Conversion ◽  
Conversion Coefficients

High spin states of 96Tc populated by the (α,n) reaction using alpha beams from 13 to 27 MeV have been studied. Gamma-ray energies and intensities, gamma–gamma coincidence probabilities, gamma-ray angular distributions, and electron conversion coefficients were determined at 18 MeV. In addition, some results taken at 14 MeV are reported.The high spin structure observed in this work includes the following levels: 49.3(6+), 318.8(6+), 574.7(7+), 926.9(9+), 946.5(8+), 1062.1(8+), 1138.8(8+), 1447.2(9+), 1702.8(10+), 1861.6(9+), 1922.3(11+), 2147.5(11+), 2213.5(10(+)), 2317.2(12+), 2396.8(11(+)), 2599.0((13)+), 2642.4((14)+), and 3020.1(12(+)).These experiments also clarify and extend the information obtained by previous workers. In particular, evidence is adduced for low-lying states at 0.0(7+), 34.3(4+), 45.3(5+), 120.3(3−), 177.0(5+), 226.2(2−), 227.0(4+), and 254.3(3+).The work identifies many other states of intermediate energy.Attenuation coefficients for states in 96Tc are calculated using a theoretical model.

scholarly journals Evaluation of Angular Distributions and Gamma-Ray Production Cross Sections for Iron

2000 ◽  
Vol 37 (sup1) ◽  
pp. 748-752 ◽  
Author(s):  
M V Savin ◽  
A V Livke ◽  
Yu. Ya. Nefedov ◽  
M S Shvetsov ◽  
A G Zvenigorodskii ◽  
...  
Keyword(s):  
Cross Sections ◽  
Gamma Ray ◽  
Production Cross ◽  
Angular Distributions

Gamma-ray angular distributions in the decays of polarizedLu171,172

1976 ◽  
Vol 13 (3) ◽  
pp. 1295-1311 ◽  
Author(s):  
K. S. Krane ◽  
C. E. Olsen ◽  
S. S. Rosenblum ◽  
W. A. Steyert
Keyword(s):  
Gamma Ray ◽  
Angular Distributions

Properties of low-lying states in 43Sc

1970 ◽  
Vol 48 (22) ◽  
pp. 2735-2750 ◽  
Author(s):  
G. C. Ball ◽  
J. S. Forster ◽  
F. Ingebretsen ◽  
C. F. Monahan
Keyword(s):  
Excited States ◽  
Gamma Ray ◽  
Level Structure ◽  
Surface Barrier ◽  
Angular Correlations ◽  
Mixing Ratios ◽  
Gamma Coincidence ◽  
Theoretical Predictions ◽  
Barrier Detector ◽  
Coincidence Spectra

The 40Ca(α, pγ)43Sc reaction at Eα = 11.8 to 15.5 MeV has been used to investigate the level structure of 43Sc below 4.2 MeV excitation. Level energies and decay schemes were determined from proton–gamma coincidence spectra obtained using an annular surface barrier detector positioned near 180° and two 40 cm3 Ge(Li) detectors. Angular correlations were measured in the same configuration using an array of six 12.7 × 15.2 cm NaI(Tl) detectors mounted on the Chalk River LOTUS goniometer. Twelve new levels were observed in 43Sc and information on the spins, branching ratios, and gamma-ray multipole mixing ratios of these and several other excited states has been obtained. The results are compared with recent theoretical predictions of Johnstone. In particular, levels at 1931 and 2552 keV, 1830 keV and 1883 keV have been tentatively assigned as the 9/2+ and probable 11/2+ members of the kπ = 3/2+ band, the (fp)3, Jπ = 11/2− state, and the 9/2− member of the kπ = 3/2− band, respectively.

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