Cross section of direct three-body breakup of 9Be for 1576-keV gamma rays

1983 ◽  
Vol 61 (11) ◽  
pp. 1579-1581 ◽  
Author(s):  
M. Fujishiro ◽  
K. Okamoto ◽  
T. Tsujimoto
Keyword(s):  
Cross Section ◽  
Gamma Rays ◽  
Cluster Model ◽  
Theoretical Estimate ◽  
Γ Rays ◽  
The Cross ◽  
Three Body

Using 1576-keV γ-rays from 142Pr, the cross section of the direct three-body breakup of 9Be was measured and found to be (4.0 ± 1.8) × 10−1 μb. This result is in approximate agreement with Salyers' theoretical estimate based upon a cluster model of 9Be.

The coherent scattering of γ -rays by K electrons in heavy atoms - II. The scattering of 0·32 mc 2 γ -rays in mercury

1954 ◽  
Vol 227 (1168) ◽  
pp. 59-72 ◽  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorptive Part ◽  
Coherent Scattering ◽  
Heavy Atoms ◽  
University Of Cambridge ◽  
Γ Rays ◽  
The Cross ◽  
The University ◽  
Scattering Cross Sections

The results of calculations for the coherent scattering of γ -rays of energy 0·32 mc 2 by K electrons in mercury are given in a form which enables one to determine scattering cross-sections at any angle, for any initial and final polarizations and for any spin orientation of the electrons. The method used in doing the computation is that described in part І, the main part of the work having been performed on the EDSAC computer at the University of Cambridge. The dispersive contribution to the cross-section agrees with previous approximate calculations. The absorptive part is calculated as well and has the effect of adding to the cross-section a contribution approximately equal to one-sixth of the dispersive contribution at all angles of scattering.

Discrepancy of in-medium nucleon–nucleon cross-section in different T-matrix representations

2014 ◽  
Vol 23 (04) ◽  
pp. 1450023 ◽  
Author(s):  
Yong-Zhong Xing ◽  
Xing-Wen Zhao
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Nucleon Nucleon ◽  
Matrix Representations ◽  
Proton Proton ◽  
Hartree Fock ◽  
Wave States ◽  
T Matrix ◽  
The Cross ◽  
Three Body

In this paper, we study the in-medium nucleon–nucleon (NN) cross-section by using the Dirac–Breuckner–Hartree–Fock approximation (DBHF) with T-matrix project technique for determining the nucleon self-energy. By solving Thompson equation for different partial-wave states separately, we find that the discrepancies of nucleon self-energies in various T-matrix project representations are dominated by the channels with smaller angular momentum. Although the cross-section is independent on the project of T-matrix, the medium suppression of the cross-section in various T-matrix representations are apparently different due to the self-consistency of DBHF calculation involving effect mass of nucleon as an iterative parameter. Our results also show that the cross-sections in the complete pseudovector (CPV) choices are larger than those obtained with both DBHF in the pseudoscalar (PS) choice and nonrelativistic Brueckner–Hartree–Fock with three-body force (BHF + 3BF), respectively. Further comparison shows that the neutron–proton (NP) cross-section within DBHF + PV approach, [Formula: see text], is approximately equal to and slightly larger than that evaluated with BHF + 3BF, [Formula: see text], while the neutron–neutron (NN) (or proton–proton (PP)) cross-section given by DBHF + PV method, [Formula: see text], being the closest to the cross-section calculated by using BHF without 3BF in the lower energy region. Additionally, the discrepancies of the in-medium nucleon–nucleon differential cross-section induced by different representations of T-matrix in DBHF are discussed for nuclear matter with different densities.

THE ELASTIC SCATTERING OF Co60 γ-RAYS

1962 ◽  
Vol 40 (5) ◽  
pp. 622-653 ◽  
Author(s):  
K. G. Standing ◽  
J. V. Jovanovich
Keyword(s):  
Form Factor ◽  
Elastic Scattering ◽  
Cross Section ◽  
Cross Sections ◽  
Thomson Scattering ◽  
Special Method ◽  
Knock Out ◽  
Order Of Magnitude ◽  
Γ Rays ◽  
The Cross

Cross sections have been measured for 90° elastic scattering of Co60 γ-rays (1.33 and 1.17 Mev) from aluminum, copper, and tin. They agree with theoretical predictions for Rayleigh and nuclear Thomson scattering. A continuum between the Compton and the elastically scattered γ-rays interfered with the measurements for heavier elements, since it increased rapidly with Z.The continuum was investigated by observing the γ-rays scattered through 60° by thin gold foils. It was found to be produced directly by the γ-rays themselves, not by the electrons they knock out of the target atoms. The experimental cross section was compared with that expected for incoherent scattering from the bound atomic electrons. It agrees within a factor of 2 with the cross section given by the form factor approximation, although it is more than an order of magnitude larger than a modification of the form factor, which is based on comparison with elastic scattering calculations.The spectrum of elastically scattered γ-rays from lead was examined by a special method in order to reduce the contribution of the inelastic continuum; two photomultipliers faced a single scintillator and pulses from one photomultiplier were counted only when they corresponded to the largest pulses from the other. The cross section between 12° and 150° was found to be much lower than that of most previous measurements. It agrees with the calculated cross section for Rayleigh and nuclear Thomson scattering within the possible errors in the calculations. Therefore the measurements yield no evidence for the presence of Delbrück scattering, the upper limit on its intensity now being set primarily by the uncertainties in the theory.

scholarly journals Der Einfluß der Temperatur auf die Strahlenempfindlichkeit von Ribonuclease

1967 ◽  
Vol 22 (3) ◽  
pp. 313-320 ◽  
Author(s):  
Wolfgang Günther ◽  
Horst Jung
Keyword(s):  
Gamma Radiation ◽  
Cross Section ◽  
Gamma Rays ◽  
Room Temperature ◽  
Bacterial Spores ◽  
Kcal Mole ◽  
Biological Objects ◽  
The Cross ◽  
Apparent Activation Energies ◽  
Mev Protons

The radiosensitivity of dry ribonuclease was determined at various temperatures ranging from 90 °K to 300 °K and using 60Co gamma-radiation, 2 MeV protons, and 2 MeV deuterons. The cross section for the inactivation of RNase S (T) is, in this range, given as a function of temperature byS(T) =S0+S1·e-Ea/RT.For inactivation of ribonuclease with Co gamma-rays we found S0=0 and Ea=1000 cal/mole; S1= =0.125 Mrad-1 when irradiation is carried out in vacuo, and S1=0.265 Mrad-1 in oxygen. With protons and deuterons the following values were determined: S0=1.28·10-14 cm2, S1=19.5·10-14 cm2, Ea=1050 cal/mole for 2 MeV protons; S0=2.45·10-14 cm2, S1=31·10-14 cm2, and Ea = 1050 cal/mole for 2 MeV deuterons. Furthermore, by analysis of some recent data from the literature we found that the cross section for inactivation by ionizing radiation of various enzymes, bacteriophages, and bacterial spores in the range from 4 °K to temperatures higher than room temperature can satisfactorily be described by the more general equationS(T) =S0+S1·e-E₁/RT+S2·e-E₂/RT,with E1=1 kcal/mole and E2=4 kcal/mole being constant for all objects and for all circumambient conditions tested. This correlation between inactivation cross section S (T) and temperature T shows three mechanisms of inactivation to occur in biological objects: one (S0) being independent of temperature, while the two others have apparent activation energies of 1 kcal/mole and 4 kcal/mole, respectively.

Observables in

1984 ◽  
Vol 62 (11) ◽  
pp. 1064-1071 ◽  
Author(s):  
M. L. Rustgi ◽  
R. D. Nunemaker ◽  
R. Vyas
Keyword(s):  
Cross Section ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Nucleon Nucleon ◽  
Asymmetry Function ◽  
The Cross

A summary of the results obtained by the authors on the cross section, polarization, and asymmetry function for [Formula: see text] at medium and low gamma-ray energies is presented. The results on the disintegration of the oriented deuterons by unpolarized gamma rays illustrate the differences arising in two of the observables from the use of two different nucleon–nucleon potentials.

THE CAPTURE OF PROTONS BY DEUTERONS

1962 ◽  
Vol 40 (4) ◽  
pp. 402-411 ◽  
Author(s):  
G. M. Griffiths ◽  
E. A. Larson ◽  
L. P. Robertson
Keyword(s):  
Angular Distribution ◽  
Total Cross Section ◽  
Energy Dependence ◽  
Cross Section ◽  
Gamma Rays ◽  
Proton Energy ◽  
P Wave ◽  
S Wave ◽  
Proton Capture ◽  
The Cross

The cross section and angular distribution of gamma rays for the reaction D(p,γ)He3 have been measured for proton energies from 275 kev to 1.75 Mev. For 275-kev protons the total cross section is 0.97 ± 0.11 microbarns and for 985-kev protons it is 3.5 ± 0.38 microbarns. The angular distribution has the form (sin2θ+b) where b is small. b is found to increase with decreasing proton energy, contrary to some previous results from this laboratory, and the energy dependence of b and of the cross section suggests that the sin2 θ part of the cross section is due to the capture of p-wave protons and the b part is due to s-wave proton capture.

Results on the cross-section of238U-fission induced by low-energy monoenergetic γ-rays

1966 ◽  
Vol 44 (1) ◽  
pp. 218-221 ◽  
Author(s):  
A. Manfredini ◽  
M. Muchnik ◽  
L. Fiore ◽  
C. Ramorino ◽  
H. G. De Carvalho ◽  
...  
Keyword(s):  
Cross Section ◽  
Low Energy ◽  
Γ Rays ◽  
The Cross

The Decay of 8.0 Min 74Ga

1975 ◽  
Vol 53 (2) ◽  
pp. 107-116 ◽  
Author(s):  
H. W. Taylor ◽  
R. L. Schulte ◽  
P. J. Tivin ◽  
H. Ing
Keyword(s):  
Cross Section ◽  
Level Scheme ◽  
Half Life ◽  
Γ Rays ◽  
The Cross

74Ga was produced through the 74Ge(n,p)74Ga reaction using 94.48% enriched 74Ge. The cross section for the reaction and the half-life of 74Ga were measured. The energies and intensities of the γ rays emitted by 74Ga were measured using Ge(Li) spectrometers. A revised level scheme for 74Ge was deduced.

scholarly journals Nuclear Data Relevant to the Production of Radioiodine I-123, I-125 by Indirect Route and Medical Applications

2016 ◽  
Vol 63 ◽  
pp. 90-97
Author(s):  
Iman Tarik Al-Alawy ◽  
Raghad Saadoon Mohammed
Keyword(s):  
Cross Section ◽  
Gamma Rays ◽  
Cross Sections ◽  
Radioactive Iodine ◽  
Nuclear Data ◽  
Practical Applications ◽  
Proton Beam Energy ◽  
Exfor Library ◽  
The Cross ◽  
Indirect Route

The use of radioactive Iodine plays an important role in the treatment of some diseases and diagnosis of others, since they have suitable half-life. The radioactivity emitted from the dissolution of radioactive I-123 and I-125, such as the emission of Auger electrons, positrons and gamma rays reduce the spread of these diseases. Therefore, in this work we discuss the Iodine production via indirect reactions. In order to calculate the cross sections of these reactions for the mentioned target elements, we recommended the cross sections for EXFOR library using the recom.m program, which is written in the present work using Matlab-8, the data are taken from different authors. In order to supply accurate databases for different practical purposes such as proton beam energy monitoring, I-123 and I-125 radioisotopes production, we have evaluated the cross section collected from IAEA for EXFOR library measured by different authors of (p,xn), (d,xn) nuclear process. The selected data and our recommended cross sections were developed for practical applications. Since the preliminary overview of the cross section measurements up to 160MeV showed that there are discrepancies between the literature results.

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