THE DECAY OF Au193 AND LEVEL SCHEME OF Pt193

1957 ◽  
Vol 35 (5) ◽  
pp. 672-692 ◽  
Author(s):  
G. T. Ewan
Keyword(s):  
Excited State ◽  
Electron Capture ◽  
Level Scheme ◽  
Half Life ◽  
Internal Conversion ◽  
Upper Limit ◽  
First Excited State ◽  
Γ Rays ◽  
Γ Ray ◽  
Conversion Spectrum

Au193 has been produced as the daughter of Hg193 formed by the reaction Au197(p, 5n)Hg193 in the McGill synchrocyclotron. The internal conversion spectrum and unconverted γ-ray spectrum have been examined using β-ray spectrometers, Nal spectrometers, and coincidence techniques. Au193 decays by electron capture to Pt193 with a half-life of 17.5 ± 0.2 hr. An upper limit of 0.08% per disintegration has been placed on the probability of emission of positrons in this decay. Twenty-eight γ-rays, all below 500 kev., have been observed associated with the decay of Au193. The first excited state of Pt193 has been shown to be at 12.7 kev. and the lifetime of this state measured as (2.2 ± 0.8) × 10−9sec. A level scheme is proposed for Pt193.

EVIDENCE FOR THE FORMATION OF LONG-LIVED Bi208 BY THE (n, 2n) REACTION ON BISMUTH

1958 ◽  
Vol 36 (1) ◽  
pp. 18-24 ◽  
Author(s):  
J. C. Roy ◽  
T. A. Eastwood ◽  
R. C. Hawkings
Keyword(s):  
Excited State ◽  
Electron Capture ◽  
Half Life ◽  
First Excited State

Long-lived Bi208 has been observed through its decay by electron capture to the first excited state of Pb208 at 2.61 Mev. It has been produced by the (n, 2n) reaction on Bi209 in the NRX reactor. The half-life of Bi208 has been estimated to be 3 × 104 years, with an uncertainty of a factor of about 2.

Excitation Energy of the Fourth Excited State in 18F

1972 ◽  
Vol 50 (14) ◽  
pp. 1682-1684 ◽  
Author(s):  
I. Berka ◽  
C. Rolfs ◽  
R. E. Azuma
Keyword(s):  
Excited State ◽  
Excitation Energy ◽  
Coincidence Measurement ◽  
Resonant States ◽  
Mean Lifetime ◽  
First Excited State ◽  
Γ Rays ◽  
The Mean ◽  
Γ Ray

The excitation energy of the Jπ = 5+, fourth excited state in 18F has been determined to be Ex = 1119.0 ± 0.6 keV from a measurement of the energy of the γ-ray transition to the 937 keV, first excited state. This new excitation energy removes the discrepancies in the excitation energy of resonant states based on γ-ray decay schemes involving this state. The mean lifetime has been determined to be τ(1119) = 218 ± 8 ns by a delayed coincidence measurement between the γ rays populating and deexciting this state.

FURTHER MEASUREMENTS ON THE γ RAYS PRODUCED BY NEUTRON CAPTURE IN BERYLLIUM AND CARBON

1953 ◽  
Vol 31 (1) ◽  
pp. 49-54 ◽  
Author(s):  
G. A. Bartholomew ◽  
B. B. Kinsey
Keyword(s):  
Excited State ◽  
Ground State ◽  
Neutron Capture ◽  
First Excited State ◽  
Γ Rays ◽  
Γ Ray

New measurements have been made of the neutron capture radiation from beryllium and carbon using a more sensitive pair spectrometer. From beryllium, γ rays with energies of 6.81 and 3.41 ± 0.06 Mev. were detected. The former is the ground state γ ray previously reported. The 3.41 Mev. γ ray, which has an intensity of about 0.25 photon per capture, seems to be due to the excitation of the first excited state in Be10. From carbon, in addition to the 4.95 Mev. ground state γ ray previously reported, a γ ray was found with an energy of 3.68 ± 0.05 Mev. and with an intensity of about 0.3 photon per capture. No γ rays were observed which could be associated with the excitation of the level at 3.9 Mev. in C13.

Internal conversion coefficients of the 392 keV γ-ray and half-life of the isomeric state in 113In

1971 ◽  
Vol 22 (1) ◽  
pp. 1-8 ◽  
Author(s):  
H.H. Hansen ◽  
E. De Roost ◽  
D. Mouchel ◽  
R. Vaninbroukx
Keyword(s):  
Isomeric State ◽  
Half Life ◽  
Internal Conversion ◽  
Internal Conversion Coefficients ◽  
Conversion Coefficients ◽  
Γ Ray

ENERGIES AND HALF-LIVES OF ISOMERIC LEVELS IN THE NUCLEI 139Ce, 141Nd, 161Ho, AND 163Ho

1967 ◽  
Vol 45 (7) ◽  
pp. 2281-2293 ◽  
Author(s):  
J. S. Geiger ◽  
R. L. Graham
Keyword(s):  
Internal Conversion ◽  
Rotational Transition ◽  
Proton Bombardment ◽  
Conversion Electrons ◽  
Transition Energies ◽  
Γ Rays ◽  
Γ Ray ◽  
Internal Conversion Electrons

A search has been made for delayed γ rays with 1 second [Formula: see text] minutes following 10.5-MeV proton bombardment of 18 natural metallic targets. The five activities observed are: (1) 139Ce, Eγ = 754.5 ± 1.3 keV, [Formula: see text] second; (2) 141Nd, Eγ = 756.8 ± 1.3 keV, [Formula: see text] second; (3) 161Ho, Eγ = 211 ± 2 keV, [Formula: see text] second; (4) 163Ho, Eγ = 299 ± 2 keV, [Formula: see text] second; and (5) a γ ray of 122 ± 2 keV, [Formula: see text] second which is tentatively assigned to 179Ta. All transitions have been measured using a Ge(Li) γ-ray detector. The internal conversion electrons of the transitions in 139Ce and 141Nd were also studied using an orange β-ray spectrometer. Rotational transition energies in 158Dy, 164Er, 168Yb, and 174Hf were measured in conjunction with the internal conversion studies and are reported in an Appendix.

The decay of 237Np

1976 ◽  
Vol 54 (13) ◽  
pp. 1409-1420 ◽  
Author(s):  
M. Skalsey ◽  
R. D. Connor
Keyword(s):  
Level Scheme ◽  
Low Energy ◽  
Coincidence Data ◽  
Γ Rays ◽  
Γ Ray

The decay of 237Np has been investigated from singles and coincidence γ-ray spectra acquired using Ge(Li) detectors. Forty-two γ rays have been observed and all but one have been placed in the level scheme of 233Pa. The presence of unobserved transitions of low energy has been confirmed by the coincidence data. Five new γ rays are reported here and a new level in 233Pa at 303.8 keV is proposed.

scholarly journals New limit for the half-life of double beta decay of 94Zr to the first excited state of 94Mo

2017 ◽  
Vol 53 (4) ◽  
Author(s):  
N. Dokania ◽  
V. Nanal ◽  
G. Gupta ◽  
S. Pal ◽  
R. G. Pillay ◽  
...  
Keyword(s):  
Excited State ◽  
Beta Decay ◽  
Half Life ◽  
Double Beta Decay ◽  
First Excited State

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.

Half-life of the first excited state in 143Pm

1968 ◽  
Vol 26 (9) ◽  
pp. 571-572 ◽  
Author(s):  
K. Heyde ◽  
M. Dorikens ◽  
J. Demuynck ◽  
D. De Frenne ◽  
J. Uyttenhove ◽  
...  
Keyword(s):  
Excited State ◽  
Half Life ◽  
First Excited State

Nuclear alinement of manganese-56

1959 ◽  
Vol 250 (1263) ◽  
pp. 550-561 ◽  
Keyword(s):  
Angular Distribution ◽  
Excited State ◽  
Angular Correlation ◽  
Excited States ◽  
Daughter Nucleus ◽  
Γ Radiation ◽  
Mixing Ratios ◽  
First Excited State ◽  
Γ Rays ◽  
Coincidence Measurements

The present work demonstrates the feasibility of alining manganese-56 produced by neutron irradiation of a nickel fluosilicate crystal containing stable 55 Mn. Measurements were made of the angular distribution of the γ-radiation from the alined 56 Mn and also of the angular correlation of the γ-rays from this isotope. By combining the results it is possible to establish uniquely as 2 the spins of the states of the daughter nucleus of 56 Fe at 2.66 and 2.98 MeV. The mixing ratios δ ( E 2/ M 1) for the 1.81 and 2.13 MeV γ-rays to the first excited state are shown to be 0.19 ± 0.02 and — 0.28 ± 0.02. The spectrum of the γ-radiation was studied with a scintillation spectrometer and this leads to the following relative intensities; 0.845 MeV (100%), 1.81 MeV (27 ± 3%), 2.13 MeV (15 ± 3%), 2.55 MeV (1.2 ± 0.2%), 2.66 MeV (0.65 ± 0.1%), 2.98 MeV (0.35 ± 0.1%) and 3.4 MeV (0.22 ± 0.05%). Coincidence measurements suggest that the 2.55 and 3.4 MeV γ-rays are due to de-excitation of a level at about 3.4 MeV which decays both to the ground and first excited states. A spin of 2 for this state is proposed.

Sign in / Sign up

Export Citation Format

Share Document