scholarly journals Angular Distributions for 6Li(p,g)7Be

1987 ◽  
Vol 40 (3) ◽  
pp. 319 ◽  
Author(s):  
CIW Tingwell ◽  
JD King ◽  
DG Sargood
Keyword(s):  
Excited States ◽  
Angular Distributions ◽  
Substantial Agreement ◽  
Direct Capture ◽  
Theoretical Predictions

Angular distributions of y rays leading directly to the ground and first excited states in the reaction 6Li(p, y) 7Be have been measured at bombarding energies of 500, 800 and 1000 keV. The results are compared with those of previous measurements and substantial agreement is found. The results are also compared with theoretical predictions of a simple direct capture model.

scholarly journals A Study of the 42Ca(p,?)43Sc Reaction

1977 ◽  
Vol 30 (4) ◽  
pp. 417 ◽  
Author(s):  
GU Din ◽  
B Heusch
Keyword(s):  
Excited States ◽  
Reasonable Agreement ◽  
Resonance Level ◽  
Angular Distributions ◽  
Proton Capture ◽  
Capture Reaction ◽  
Decay Properties ◽  
Theoretical Predictions ◽  
Bombarding Energy ◽  
First Time

The 42Ca(p, y)43SC reaction has been studied below 2�75 MeV proton bombarding energy. Approximately 100 resonances have been identified and located in the range Ep = 2�00-2�75 MeV. Nine resonances at Ep = 1045, 1201, 1299, 1319, 2038, 2471, 2523, 2643 and 2714 keV for the 42Ca(p, y)43SC reaction were investigated with either a 54 or a 120 cm3 Ge(Li) detector. Single spectra were obtained at each of these resonances, and these were used to derive consistent y ray decay schemes and accurate level energies for the resonant and bound levels of 43Sc. Fifty-two bound levels up to an excitation energy of 4�47 MeV were observed, out of which seventeen new levels have been identified at 2�114,2� 796,2' 846,2' 860,2' 875,3 '160,3' 331,3' 374,3 '463,3;504,3' 645, 3'734,3'757,3'860,4'007,4'038 and 4�430 MeV. In addition, new results or results differing from earlier reports have been obtained for the decay properties of levels below 4�47 MeV in 43SC? The strengths of the nine resonances were measured relative to the reported strength at Ep = 2038 keV. The resonance at Ep = 2643 keV was shown for the first time to populate levels of spin> 7/2 via the proton capture reaction. A strong M1 (analogue to anti-analogue) transition from the resonance level to the level at 1� 931 MeV (9/2+) was observed. From measurements of y ray angular distributions, the following spin and parity assignments were made: 9/2+ at 7'514, 7/2+ at 4'371, >7/2 at 4'038 and 7/2 at 3�808 MeV. The resonance level at 7�514 MeV has possibly aT = 3/2 character. The low-lying excited states in 43SC are in reasonable agreement with the theoretical predictions of Johnstone (1968).

MEASUREMENTS OF SPECTRAL AND ANGULAR DISTRIBUTIONS OF SECONDARY GAMMA-RAYS IN MATTER

1955 ◽  
Vol 33 (2) ◽  
pp. 96-109 ◽  
Author(s):  
G. N. Whyte
Keyword(s):  
Gamma Rays ◽  
Pulse Height ◽  
Energy Spectra ◽  
Angular Distributions ◽  
Barrier Thickness ◽  
Crystal Spectrometer ◽  
Theoretical Predictions ◽  
The Face ◽  
Concrete Barrier ◽  
Secondary Gamma Radiation

The distribution in energy and angle of the secondary gamma radiation emerging from the face of a concrete barrier containing a point source of cobalt-60 has been measured as a function of barrier thickness. Results on energy spectra and angular distributions are presented, and some of their features are compared with theoretical predictions. The operation of the two-crystal spectrometer and the photographic system for recording pulse-height distributions are described in some detail.

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]

Spectroscopic Study of 32S Through the 31P(d,n)32S Reaction

1974 ◽  
Vol 52 (14) ◽  
pp. 1288-1294 ◽  
Author(s):  
A. H. Hussein ◽  
G. C. Neilson ◽  
W. J. McDonald ◽  
W. K. Dawson
Keyword(s):  
Spectroscopic Study ◽  
Shell Model ◽  
Cross Sections ◽  
Differential Cross ◽  
Time Of Flight ◽  
Angular Distributions ◽  
Absolute Differential ◽  
Spectroscopic Factors ◽  
Model Predictions ◽  
Theoretical Predictions

The 31P(d,n)32S reaction has been studied at deuteron energies of 4.0 and 5.45 MeV. Neutron energies were measured by time of flight. Absolute differential cross sections of seven levels in 32S have been measured and compared with the theoretical predictions of both the DWBA and compound statistical theories. Analysis of the angular distributions yielded lP values and absolute spectroscopic factors. These results have been compared with those from other experiments and shell model predictions.

scholarly journals B → K(∗)μ+μ− in covariant quark model

2015 ◽  
Vol 39 ◽  
pp. 1560113
Author(s):  
A. Liptaj ◽  
S. Dubnička ◽  
A. Z. Dubničková ◽  
M. A. Ivanov
Keyword(s):  
Beyond Standard Model ◽  
Standard Model ◽  
Quark Model ◽  
Rare Decays ◽  
Form Factors ◽  
New Physics ◽  
Angular Distributions ◽  
Heavy Mesons ◽  
Theoretical Predictions ◽  
Covariant Quark Model

The covariant quark model with infrared confinement (CQM) is a well-suited theoretical framework to describe large variety of hadronic processes, including rare decays of heavy mesons. In this text we focus on the reactions [Formula: see text], which have been recently measured by Refs. 1–4. The measurements include also information about the angular distributions and their significance is given by possible New Physics (NP) effects which are predicted in numerous beyond Standard Model (SM) scenarios. Even with clever choice of experimental observables, a model dependence cannot be fully removed from the theoretical predictions. In this text we present the computation of the [Formula: see text] form factors within the CQM and give results for some of the most commonly used observables ([Formula: see text], [Formula: see text]).

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.

EXPERIMENTAL INVESTIGATION OF 6Be CLUSTER DECAY

2011 ◽  
Vol 20 (04) ◽  
pp. 1034-1037
Author(s):  
P. PAPKA ◽  
F. NEMULODI ◽  
R. A. BARK ◽  
N. Y. KHESWA ◽  
E. A. LAWRIE ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Excited States ◽  
Resonant State ◽  
Center Of Mass ◽  
Cluster Decay ◽  
Angular Distributions ◽  
Charge Exchange Reaction ◽  
First Excited State ◽  
Mass Frame ◽  
Energy And Angular Distributions

A complete kinematics measurement was performed using the 6 Li (3 He ,t) charge exchange reaction to populate 6 Be at Elab = 50 MeV . Decay mode of the ground and first excited states were studied through the analysis of the energy and angular distributions of the break-up particles in the 6 Be center of mass frame. Two-body decay is observed above the first excited state but not firmly assigned to a 6 Be resonant state. Experimental challenges regarding the identification of true 6 Be events in the excitation energy region 5 < Ex < 20 MeV are discussed.

scholarly journals Electron Collisions with Metastable Helium

1996 ◽  
Vol 49 (2) ◽  
pp. 515 ◽  
Author(s):  
Marcus Jacka ◽  
Jennifer Kelly ◽  
Birgit Lohmann ◽  
Stephen Buckman
Keyword(s):  
Excited States ◽  
Electron Scattering ◽  
Low Energy ◽  
Angular Distributions ◽  
Theoretical Studies ◽  
Electron Collisions ◽  
Metastable Helium ◽  
First Results

Measurements and theoretical studies of electron scattering from the metastable 21,3S excited states of helium are briefly reviewed. An apparatus developed for the study of low energy differential scattering from metastable excited states is discussed in detail and the first results of angular distributions for electrons superelastically scattered from the 21,3S states at incident energies of 5, 10 and 30 eV are presented.

Excited states of 48Ca and angular distributions in proton scattering

1966 ◽  
Vol 20 (5) ◽  
pp. 516-518 ◽  
Author(s):  
L. Lassen ◽  
T. Scholz ◽  
H.J. Unsöld
Keyword(s):  
Excited States ◽  
Angular Distributions ◽  
Proton Scattering
Sign in / Sign up

Export Citation Format

Share Document