Cross section for formation of frenkel defects by Co60 gamma rays

1967 ◽  
Vol 10 (4) ◽  
pp. 30-32
Author(s):  
A. T. Lebedev
Keyword(s):  
Cross Section ◽  
Gamma Rays ◽  
Frenkel Defects ◽  
Co60 Gamma

Absolute Cross Section of the Reaction Cu63(γ, n)Cu62 for Lithium Gamma Rays

1960 ◽  
Vol 15 (11) ◽  
pp. 1913-1919 ◽  
Author(s):  
Shinjiro Yasumi ◽  
Minoru Yata ◽  
Kunio Takamatsu ◽  
Akira Masaike ◽  
Yoshiko Masuda
Keyword(s):  
Cross Section ◽  
Gamma Rays ◽  
Absolute Cross Section

A method for measuring the integral scattering cross section of gamma rays at small angles

1984 ◽  
Vol 224 (3) ◽  
pp. 461-468 ◽  
Author(s):  
K.S. Puttaswamy ◽  
Mari Gowda ◽  
B. Sanjeevaiah
Keyword(s):  
Cross Section ◽  
Gamma Rays ◽  
Scattering Cross Section ◽  
Scattering Cross

GAMMA RADIATION FROM THE PROTON BOMBARDMENT OF BORON TEN

1956 ◽  
Vol 34 (4) ◽  
pp. 381-388 ◽  
Author(s):  
G. B. Chadwick ◽  
T. K. Alexander ◽  
J. B. Warren
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Gamma Rays ◽  
Lower Energy ◽  
Sodium Iodide ◽  
Scintillation Counter ◽  
Proton Bombardment ◽  
Broad Resonance ◽  
Energy Formula ◽  
Cascade Transitions

The gamma rays resulting from the bombardment of B10 with protons of energies from 0.5 to 2.0 Mev. have been observed with a sodium iodide scintillation counter. Capture radiation, of energy[Formula: see text]showed a broad resonance at Ep = 1135 ± 15 kev. At this energy, the radiation had an angular distribution of the form 1 + (0.50 ± 0.05)cos2θ and a total cross section (3.5 ± 1.0)10−30 cm.2 Several lower energy radiations were also observed and assigned tentatively to cascade transitions in C11.The cross section for the 430 kev. radiation from the reaction B10(p, αγ)Be7 was found to be 0.21 ± 0.05 barn at Ep = 1.52 Mev. This radiation was found to be isotropic.

High-Purity Germanium Technology for Gamma-Ray and X-Ray Spectroscopy

1993 ◽  
Vol 302 ◽  
Author(s):  
L.S. Darken ◽  
C. E. Cox
Keyword(s):  
Cross Section ◽  
Gamma Rays ◽  
Ground State ◽  
High Purity ◽  
Gamma Ray ◽  
Capture Rate ◽  
X Rays ◽  
Hole Capture ◽  
High Purity Germanium ◽  
Energy Gamma

ABSTRACTHigh-purity germanium (HPGe) for gamma-ray spectroscopy is a mature technology that continues to evolve. Detector size is continually increasing, allowing efficient detection of higher energy gamma rays and improving the count rate and minimum detectable activity for lower energy gamma rays. For low-energy X rays, entrance window thicknesses have been reduced to where they are comparable to those in Si(Li) detectors. While some limits to HPGe technology are set by intrinsic properties, the frontiers have historically been determined by the level of control over extrinsic properties. The point defects responsible for hole trapping are considered in terms of the “standard level” model for hole capture. This model originates in the observation that the magnitude and temperature dependence of the cross section for hole capture at many acceptors in germanium is exactly that obtained if all incident s-wave holes were captured. That is, the capture rate is apparently limited by the arrival rate of holes that can make an angular-momentum-conserving transition to a s ground state. This model can also be generalized to other materials, where it may serve as an upper limit for direct capture into the ground state for either electrons or holes. The capture cross section for standard levels σS.L. is given bywhere g is the degeneracy of the ground state of the center after capture, divided by the degeneracy before capture. Mc is the number of equivalent extrema in the band structure for the carrier being captured, mo is the electronic mass, m* is the effective mass, and T is the temperature in degrees Kelvin.

Measurement of Z-dependence of elastic scattering cross section of gamma rays (II)

1966 ◽  
Vol 80 (1) ◽  
pp. 93-98 ◽  
Author(s):  
S. Anand ◽  
M. Singh ◽  
B.S. Sood
Keyword(s):  
Elastic Scattering ◽  
Cross Section ◽  
Gamma Rays ◽  
Scattering Cross Section ◽  
Scattering Cross ◽  
Elastic Scattering Cross Section

The photoelectric cross section of gamma rays in the energy range 43 to 152 keV

1987 ◽  
Vol 17 (5) ◽  
pp. 1279-1284 ◽  
Author(s):  
F Machali ◽  
G G Al-Barakati ◽  
A A El-Sayed ◽  
W J Altaf
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Gamma Rays ◽  
Photoelectric Cross Section

scholarly journals Nuclear Structure Investigations of some Medium-Weight Isotopes

2021 ◽  
Author(s):  
◽  
Gavin Wallace
Keyword(s):  
Nuclear Structure ◽  
Beta Decay ◽  
Cross Section ◽  
Gamma Rays ◽  
Half Life ◽  
Decay Scheme ◽  
Gamma Ray ◽  
Calculated Cross Section ◽  
Beta Spectrum ◽  
Gamma Ray Detectors

<p>This thesis describes the methods and results of investigations made to determine the decay schemes of three short-lived isotopes 112Ag, 114Ag and 116Ag. A total of 76 gamma-rays was observed with a Ge(Li) detector in the gamma-radiation which follows the Beta-decay of 112Ag to levels of 112Cd. gamma- gamma coincidence and angular correlation measurements were made with Ge(Li)-NaI(T1) and NaI(T1)-NaI(T1) systems. A decay scheme consistent with the present data is proposed. Cross sections for the reactions 112Cd(n,p)112Ag and 115In(n, alpha)112Ag were measured, and the half-life of the 112Ag decay was found to be 3.14 plus-minus 0.01 hr. The decay scheme of 114Ag was studied with Ge(Li) gamma-ray detectors and plastic Beta-ray detectors. 9 of the 11 gamma-rays observed in the decay were incorporated into 114Cd level structure previously determined by conversion electron measurements on the 113Cd(n,gamma)114Cd reaction. The endpoint energy of the Beta-decay was determined as 4.90 plus-minus 0.26 MeV; no branching was evident in the Beta-spectrum. A decay scheme is proposed for which the Beta-branching was deduced from the measured gamma-ray yield and a calculated cross section value for the 114Cd(n,p)114Ag reaction. The 114Ag half-life was determined as 4.52 plus-minus 0.03 sec; a search for a previously reported isomeric state of 114Ag was unsuccessful. Ge(Li) and NaI(T1) gamma-ray detectors were used to study the direct and coincidence spectra that result from the decay of 116Ag, the half-life of which was found to be 2.50 plus-minus 0.02 min. 53 gamma-rays were observed from this decay. The Beta-branching to the 17 excited states of 116Cd in the proposed decay scheme was derived from the measured gamma-ray yield and a calculated cross section value for the 116Cd(n,p)Ag reaction. Spin and parity assignments for ihe energy levels of 116Cd are made. An investigation of the applicability of two collective models to nuclear structure typical of the Cd nuclei studied demonstrated that one of the models was misleading when applied to vibrational nuclei. A potential function was developed in the other model to extend the investigation to include a study of the transition between extremes of collective motion. This was used to examine the correspondence between nuclear level schemes representative of rotational and vibrational excitations.</p>

REARRANGEMENT STUDIES WITH C14. X. ETHANOL-2-C14 FROM THE IRRADIATION OF ETHANOL-1-C 14 WITH Co60 GAMMA RAYS

1960 ◽  
Vol 38 (12) ◽  
pp. 2315-2318 ◽  
Author(s):  
C. C. Lee ◽  
D. G. Lee
Keyword(s):  
Aqueous Solutions ◽  
Gamma Rays ◽  
Γ Rays ◽  
G Value ◽  
Co60 Gamma

The irradiation of aqueous solutions of ethanol-1-C14, containing about 2% ethanol by weight, with up to 58.0 million rads of Co60 γ-rays led to the formation of up to 0.49% ethanol-2-C14 in the alcohol recovered after irradiation. The G value of this isotope position rearrangement was about 0.04 and amounted to approximately 2% of the G value for the total amount of ethanol decomposed. Possible mechanisms for the rearrangement are discussed.

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