scholarly journals (n,γ) reactions on rare Ca isotopes: Valence-hole - core excitation couplings in 47Ca

2018 ◽  
Vol 193 ◽  
pp. 05001 ◽  
Author(s):  
S. Bottoni ◽  
N. Cieplicka-Oryńczak ◽  
G. Bocchi ◽  
S. Leoni ◽  
B. Fornal ◽  
...  
Keyword(s):  
Experimental Data ◽  
Ground State ◽  
Neutron Capture ◽  
Nuclear Reactor ◽  
Cold Neutron ◽  
Effective Interaction ◽  
Core Excitation ◽  
Experimental Campaign ◽  
Hpge Detectors ◽  
Γ Ray

Recent results on the structure of 47Ca will be presented. The nucleus of interest was populated via the cold-neutron capture 46Ca(n,γ) reaction, on a rare 46Ca target, during the EXILL experimental campaign at the nuclear reactor of Institut Laue- Langevin in Grenoble. High-resolution γ-ray spectroscopy, performed with a composite array of HPGe detectors, enabled the identification of new transitions deexciting states between the neutron-capture level and the ground state. Experimental data will be compared with a novel microscopic theoretical model, currently under development, specifically designed to describe the low-lying structure of odd-mass nuclei with one valence particle/hole outside a spherical doubly-magic core, using the Skyrme effective interaction self-consistently.

THE NEUTRON CAPTURE 7-RAYS FROM POTASSIUM

1953 ◽  
Vol 31 (6) ◽  
pp. 927-931 ◽  
Author(s):  
G. A. Bartholomew ◽  
B. B. Kinsey
Keyword(s):  
Excited State ◽  
Potassium Carbonate ◽  
Ground State ◽  
Neutron Capture ◽  
State Transition ◽  
Ground State Transition ◽  
Γ Rays ◽  
Γ Ray

The capture γ-rays from potassium have been re-examined with greater resolution than was used in previous experiments. The upper end of the spectrum has been carefully studied both with a sample of natural potassium carbonate and with another in which the potassium was enriched in K40. From a comparison of the spectra two γ-rays with energies of 9.39 ± 0.06 and 8.45 ± 0.02 Mev. are assigned to capture by that isotope. The strong γ-ray at 7.757 ± 0.008 Mev. previously ascribed to the ground state transition in K40 is now found to represent a transition to a low-lying excited state in that nucleus.

Thermal neutron capture γ-ray spectrum of molybdenum and ruthenium

1991 ◽  
Vol 69 (6) ◽  
pp. 658-664 ◽  
Author(s):  
M. A. Islam ◽  
T. J. Kennett ◽  
W. V. Prestwich
Keyword(s):  
Thermal Neutron ◽  
Neutron Capture ◽  
Nuclear Reactor ◽  
Thermal Neutron Capture ◽  
Global Average ◽  
Transition Level ◽  
Γ Rays ◽  
Γ Ray ◽  
Strength Functions ◽  
Mcmaster University

The thermal neutron capture γ rays from natural molybdenum and ruthenium have been studied using a pair spectrometer and the tangential facility at the McMaster University Nuclear Reactor. Precise transition, level, and neutron separation energies of different isotopes are inferred. The separation energies are: Sn(93Mo) = 8069.76 ± 0.09, Sn(95Mo) = 7369.10 ± 0.10, Sn(96Mo) = 9154.31 ± 0.05, Sn(97Mo) = 6821.15 ± 0.25, Sn(98Mo) = 8642.55 ± 0.07, Sn(99Mo) = 5925.42 ± 0.15, Sn(100Ru) = 9673.48 ± 0.05, and Sn(102Ru) = 9219.64 ± 0.05 keV. The M1 strength functions of 100Ru,102Ru, 96Mo, and 98Mo are (34 ± 15) × 10−9, (82 ± 41) × 10−9, (22 ± 7) × 10−9, and (25 ± 8) × 10−9 MeV−3, respectively. All values but that for 102Ru agree with the global average of (20 ± 6) × 10−9 MeV−3. The average [Formula: see text] of 96Mo observed is 247 ± 175 e2 fm4 MeV−1.

NEUTRON CAPTURE GAMMA RAYS FROM FLUORINE, MAGNESIUM, GALLIUM, BROMINE, AND HAFNIUM

1957 ◽  
Vol 35 (12) ◽  
pp. 1361-1379 ◽  
Author(s):  
P. J. Campion ◽  
G. A. Bartholomew
Keyword(s):  
Energy Range ◽  
Gamma Rays ◽  
Ground State ◽  
Neutron Capture ◽  
State Transition ◽  
High Energy ◽  
The Other ◽  
Ground State Transition ◽  
Γ Rays ◽  
Γ Ray

The neutron capture γ-ray spectra of fluorine, magnesium, gallium, bromine, and hafnium have been studied in the energy range above 3 Mev. In fluorine four γ-rays and in magnesium 12 γ-rays have been detected in addition to those previously observed. Most of these new radiations can be assigned to the known level schemes of the product nuclei. The spectrum obtained for each of the other elements is complex with only a few of the high energy γ-rays resolved, and in each case the γ-ray of highest energy is very weak and difficult to distinguish from the background. The most energetic gallium γ-ray at 7.73 ± 0.02 Mev. may be emitted in the direct ground state transition in Ga70 while the 7.879 ± 0.013 Mev. γ-ray from bromine probably corresponds to the ground state transition in Br80. In hafnium none of the observed γ-rays can be identified with a ground state transition in any of the isotopes.

Lifetimes of the 26 and 110 keV levels in 56Mn

1971 ◽  
Vol 49 (23) ◽  
pp. 2911-2916 ◽  
Author(s):  
J. F. Boulter ◽  
W. V. Prestwich
Keyword(s):  
Dipole Moment ◽  
Ground State ◽  
Neutron Capture ◽  
Magnetic Dipole Moment ◽  
Transition Probabilities ◽  
Magnetic Moments ◽  
Thermal Neutron Capture ◽  
Lifetime Measurements ◽  
Γ Ray ◽  
Theoretical Results

Using thermal-neutron capture on natural manganese targets, delayed coincidence lifetime measurements have been made for the 26 keV level: T1/2 = 8.65 ± 0.50 ns, and the 110 keV level: T1/2 = 5.08 ± 0.15 ns in 56Mn. A systematic error in the 26 keV lifetime measurement, which arises when the 26 keV level is populated by a γ ray which has cascaded through the delayed 110 keV level, has been examined. The experimental reduced M1 and E2 transition probabilities were calculated for the 26 and 84 keV transitions. The reduced M1 strength for the 26 keV transition and the ground-state magnetic dipole moment of 56Mn have been compared with theoretical results obtained using the magnetic moments of neighboring odd-A nuclei as the base states.

scholarly journals Activities of γ-ray emitting isotopes in rainwater from Greater Sudbury, Canada following the Fukushima incident

2012 ◽  
Vol 90 (6) ◽  
pp. 599-603 ◽  
Author(s):  
B.T. Cleveland ◽  
F.A. Duncan ◽  
I.T. Lawson ◽  
N.J.T. Smith ◽  
E. Vázquez-Jáuregui
Keyword(s):  
Neutron Capture ◽  
Nuclear Reactor ◽  
Reference Sample ◽  
Germanium Detector ◽  
Activity Levels ◽  
Eastern Canada ◽  
Health Concerns ◽  
Γ Ray ◽  
Ice Water

We report the activity measured in rainwater samples collected in the Greater Sudbury area of eastern Canada on 3, 16, 20, and 26 April 2011. The samples were γ-ray counted in a germanium detector and the isotopes 131I and 137Cs, produced by the fission of 235U, and 134Cs, produced by neutron capture on 133Cs, were observed at elevated levels compared to a reference sample of ice water. These elevated activities are ascribed to the accident at the Fukushima Dai-ichi nuclear reactor complex in Japan that followed the 11 March 2011, earthquake and tsunami. The activity levels observed at no time presented health concerns.

NPDGamma: A Measurement of the Parity Violating Directional γ-Ray Asymmetry in Polarized Cold Neutron Capture on Hydrogen

2009 ◽  
Author(s):  
Nadia Fomin ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
Simonetta Liuti ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Cold Neutron ◽  
Γ Ray

scholarly journals Relativistic Hartree-Bogoliubov description of deformed light nuclei

2020 ◽  
Vol 13 ◽  
pp. 1
Author(s):  
G. A. Lalazissis ◽  
D. Vretenar ◽  
P. Ring
Keyword(s):  
Experimental Data ◽  
Nuclear Matter ◽  
Ground State ◽  
Effective Interaction ◽  
Mean Field ◽  
Light Nuclei ◽  
Recent Experimental Data ◽  
Finite Range ◽  
Pairing Correlations ◽  
The Mean

The Relativistic Hartree-Bogoliubov model is applied in the analysis of ground- state properties of light nuclei with 4 < Ζ < 11. The model uses the NL3 effective interaction in the mean-field Lagrangian, and describes pairing correlations by the pairing part of the finite range Gogny interaction DIS. Neutron separation energies, quadrupole deformations, nuclear matter radii, and differences in radii of proton and neutron distributions are compared with recent experimental data.

GAMMA-RAY STUDIES USING DEUTERIUM-LOADED PHOTOGRAPHIC PLATES

1950 ◽  
Vol 28a (5) ◽  
pp. 475-487 ◽  
Author(s):  
C. H. Millar ◽  
A. G. W. Cameron ◽  
M. Glicksman
Keyword(s):  
Ground State ◽  
Neutron Capture ◽  
Gamma Ray ◽  
Excited Level ◽  
Cooling Water ◽  
Β Decay ◽  
Nuclear Emulsions ◽  
Γ Rays ◽  
Γ Ray

Deuterium-loaded nuclear emulsions have been used to study the γ-rays of neutron capture in sodium, chlorine, and cadmium, and the γ-rays following the β-decay of N16. Proton tracks caused by the photodisintegration of deuterium were measured, and from these the γ-ray energies were calculated. Several lines have been observed in the γ-ray spectra of neutron capture. The known energy of the 6.124 Mev. γ-ray following the decay of N16 (produced in the cooling water of the Chalk River pile) was used to calibrate the plates. A higher energy γ-ray from the decay of N16 was tentatively identified as corresponding to a transition from the 6.897 Mev. excited level of O16 to the ground state and was found to have one-seventh the intensity of the 6.124 Mev. γ-ray.

Determination of Hydrogen in Semiconductors and Related Materials by Cold Neutron Capture Prompt Gamma-Ray Activation Analysis

1993 ◽  
Vol 324 ◽  
Author(s):  
Rick L. Paul ◽  
Richard M. Lindstrom
Keyword(s):  
Activation Analysis ◽  
Neutron Capture ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Dielectric Film ◽  
Nondestructive Method ◽  
Chemical Form ◽  
Prompt Gamma ◽  
Γ Ray

AbstractA reliable nondestructive method for measuring trace amounts of hydrogen in semiconductors and related materials has long been needed. Cold neutron capture prompt γ-ray activation analysis (CNPGAA) is a nondestructive, multielement technique which has found application in the measurement of trace amounts of hydrogen. The sample is irradiated by a beam of “cold” neutrons; the presence of hydrogen is confirmed by the detection of a 2223 keV gamma-ray. The technique gives bulk analyses (the neutron and gamma radiation penetrate the sample), the hydrogen peak is free of interferences, and the results are independent of the chemical form of hydrogen present. The instrument is capable of detecting less than 10 mg/kg of hydrogen in many matrices. We have used the technique to measure hydrogen levels in a dielectric film on a silicon wafer, semiconductor grade germanium, and quartz.

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