Decay of 83Ym and 83Yg to Levels in 83Sr

1973 ◽  
Vol 51 (10) ◽  
pp. 1098-1103 ◽  
Author(s):  
M. L. Simpson ◽  
J. E. Kitching ◽  
S. K. Mark
Keyword(s):  
Shell Model ◽  
Ground State ◽  
Internal Conversion ◽  
Metastable Level ◽  
Metastable Decay ◽  
Spin Parity ◽  
State Decay ◽  
Probable Spin ◽  
Γ Rays

The decays of 2.85 min 83Ym and of 7.06 min 83Yg have been investigated. Two photons are observed to be associated with the metastable decay, and one depopulates a 4.95 s metastable level at 259.3 keV in 83Sr. Seventeen γ rays are associated with the ground state decay, γ–γ coincidence and internal conversion measurements are carried out. Decay schemes are proposed with deduced log ft values for the various decay branches. Probable spin–parity assignments are given. The nature of the states involved are discussed within the context of the shell model.

scholarly journals The internal conversion of gamma-rays.—Part II

1928 ◽  
Vol 121 (787) ◽  
pp. 447-456
Keyword(s):  
Magnetic Field ◽  
Quantum Mechanics ◽  
Wave Equation ◽  
Gamma Rays ◽  
Internal Conversion ◽  
Scalar Potential ◽  
X Ray ◽  
Electro Magnetic Field ◽  
Γ Rays ◽  
Electro Magnetic

In a previous paper the absorption of γ-rays in the K-X-ray levels of the atom in which they are emitted was calculated according to the Quantum Mechanics, supposing the γ-rays to be emitted from a doublet of moment f ( t ) at the centre of the atom. The non-relativity wave equation derived from the relativity wave equation for an electron of charge — ε moving in an electro-magnetic field of vector potential K and scalar potential V is h 2 ∇ 2 ϕ + 2μ ( ih ∂/∂ t + εV + ih ε/μ c (K. grad)) ϕ = 0. (1) Suppose, however, that K involves the space co-ordinates. Then, (K. grad) ϕ ≠ (grad . K) ϕ , and the expression (K . grad) ϕ is not Hermitic. Equation (1) cannot therefore be the correct non-relativity wave equation for a single electron in an electron agnetic field, and we must substitute h 2 ∇ 2 ϕ + 2μ ( ih ∂/∂ t + εV) ϕ + ih ε/ c ((K. grad) ϕ + (grad. K) ϕ ) = 0. (2)

scholarly journals SPECTROSCOPY IN A ROTATING DEFORMED NUCLEUS

2020 ◽  
Vol 2 ◽  
pp. 295
Author(s):  
C. T. Papadopoulos ◽  
R. Vlastou
Keyword(s):  
Experimental Data ◽  
Shell Model ◽  
High Spin ◽  
Theoretical Treatment ◽  
Recent Advances ◽  
Γ Rays ◽  
Deformed Nucleus ◽  
New Phenomena ◽  
Band Crossing

Recent advances in the physics of nuclei at high spin are presented. In particular the new phenomena observed by the latest generation of γ-rays spectrometers are discussed. An overview of experimental and theoretical treatment of "backbending·'' effect, quasiparticle alignment and band crossing is described in more detail. The outlines of the Cranked Shell Model, which is a successful framework for the interpretation of experimental data, are also reported.

Detection of ground state atoms by electron excitation to a metastable level

1982 ◽  
Vol 15 (3) ◽  
pp. 328-333 ◽  
Author(s):  
P G A Theuws ◽  
H C W Beijerinck ◽  
N F Verster
Keyword(s):  
Ground State ◽  
Electron Excitation ◽  
Metastable Level

PARTICLE-NUMBER CONSERVING TREATMENT FOR THE GROUND STATE BANDS IN EVEN-EVEN TRANSFERMIUM NUCLEI

2008 ◽  
Vol 17 (supp01) ◽  
pp. 208-218 ◽  
Author(s):  
XIAO-TAO HE ◽  
ZHONG-ZHOU REN
Keyword(s):  
Angular Momentum ◽  
Shell Model ◽  
Single Particle ◽  
Ground State ◽  
Particle Number ◽  
Rotational Frequency ◽  
Moment Of Inertia ◽  
Particle Level ◽  
Pairing Correlations ◽  
Band Crossing

The ground state bands observed in even-even transfermium nuclei 250 Fm and 252,254 No are investigated by the cranked shell model with the particle-number conserving treatment for the monopole and quadrupole pairing correlations. The experimental variations of the kinematic moment of inertia with rotational frequency are reproduced very well in our calculation. Our results show bankbendings of [Formula: see text] at ħω ≈ 0.275 and 0.300 MeV in 252 No and 254 No , respectively. The detailed information about the contribution to alignment from each cranked single particle level exhibits that the backbending is mainly due to the rapidly aligned angular momentum of proton 1j15/2 [770]1/2 pairs and neutron 2h11/2 [761]3/2, 1j15/2 [734]9/2 pairs the band crossing.

scholarly journals On the Decay of 165Dy

1968 ◽  
Vol 23 (7) ◽  
pp. 962-967
Author(s):  
E. Bashandy ◽  
N. Ibrahiem ◽  
G. El-Sayad
Keyword(s):  
Decay Scheme ◽  
Internal Conversion ◽  
Level Structure ◽  
Low Energy ◽  
Conversion Electron Spectrum ◽  
Nuclear Models ◽  
Conversion Coefficients ◽  
Γ Rays ◽  
Double Focusing ◽  
Experimental Level

The internal conversion electron spectrum of transitions in the decay of (139 min) 165Dy to 165Ho has been studied using a high resolution iron-free double focusing β-ray spectrometer. In addition to γ rays previously reported eight new γ rays, mostly in the low energy region, have been observed. A decay scheme involving 17 excited levels is proposed for 165Ho. Multipolarity data, obtained from the measurements of absolute or ratios of conversion coefficients of γ rays, were utilized for assigning possible spins and parities to the levels of 165Ho. The experimental level structure is discussed in the light of nuclear models.

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.

Investigation of excitation of Ag atoms in internal conversion of γ rays

2007 ◽  
Vol 71 (6) ◽  
pp. 890-893 ◽  
Author(s):  
I. N. Vishnevsky ◽  
S. S. Drapey ◽  
V. A. Zheltonozhsky ◽  
E. O. Kochergina ◽  
N. V. Strilchuk
Keyword(s):  
Internal Conversion ◽  
Γ Rays

The high pressure photochemistry of alkenes. III. The 184.9 nm photoisomerization processes in acyclic alkenes

1985 ◽  
Vol 63 (7) ◽  
pp. 1424-1430 ◽  
Author(s):  
Guy J. Collin ◽  
Hélène Deslauriers
Keyword(s):  
Ground State ◽  
Internal Conversion ◽  
Rydberg State ◽  
Singlet State ◽  
Hydrogen Shift ◽  
Geometric Isomerization ◽  
Trans Isomerization ◽  
Show Evidence ◽  
Structural Isomerization ◽  
Π State

We have made a systematic study of the 184.9 nm photoisomerization of the gaseous acyclic alkenes. Apart from the cis-trans isomerization (geometric isomerization), we have also observed the formation of products arising from the 1,3-hydrogen and methylene shifts (structural isomerization). 1-Alkenes do not show evidence of structural isomerization. This kind of isomerization increases with an increase in the number of alkyl substituents around the double bond. These observations, combined with those from the literature, may be explained on the basis of the following: (a) the 1π,π* state is involved in the cis–trans isomerization process; (b) the 1π,R(3s) state is responsible for the methylene shifts; (c) another singlet state is required for the 1,3-hydrogen shift; (d) this last state is either at an energy level higher than that of the Rydberg state or the hot ground state. Finally, the photoexcited molecules, through internal conversion, may convert from one state to another, and their lifetime is long enough to be stabilized by collision.

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