Negative Parity Levels in 30Si

1974 ◽  
Vol 52 (16) ◽  
pp. 1485-1491 ◽  
Author(s):  
M. Wayne Greene ◽  
H. H. Grawe ◽  
J. A. Kuehner
Keyword(s):  
Gamma Ray ◽  
Negative Parity ◽  
Coincidence Measurement ◽  
Model Structure ◽  
Polarization Direction ◽  
Decay Branch ◽  
Mean Lifetime ◽  
Doppler Shift Attenuation ◽  
Γ Rays ◽  
The Mean

A polarization direction correlation measurement of γ rays from the 7.044 MeV level in 30Si results in Jπ = 5− for this level and implies a Jπ = 4− assignment for the level at 6.503 MeV. A particle gamma ray coincidence measurement establishes a new decay branch (15 ± 4%) for the 6.503 MeV level to the 5.485 MeV Jπ = 3− level. The Doppler shift attenuation method was used to measure the mean lifetime of the 7.044 MeV level as [Formula: see text]. A simple shell model structure for the low lying negative parity states is presented and shown to be consistent with experimental measurements.

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.

NOMOGRAM OF LIFETIME–ENERGY–SPIN FOR GAMMA-RAY TRANSITIONS

1952 ◽  
Vol 30 (6) ◽  
pp. 660-662 ◽  
Author(s):  
R. Montalbetti
Keyword(s):  
Gamma Ray ◽  
Mean Lifetime ◽  
The Mean

A nomogram of the recent Weisskopf formula relating the mean life for gamma-ray transitions to the energy and spin change has been constructed. The nomogram is useful in that it allows rapid computations and shows at a glance the dependence of mean lifetime upon the variables involved.

The Lifetimes of the 3/2+, 975 keV Level in 25Mg and the 3/2+, 945 keV Level in 25Al

1972 ◽  
Vol 50 (18) ◽  
pp. 2198-2205 ◽  
Author(s):  
T. K. Alexander ◽  
O. Häusser ◽  
A. B. McDonald ◽  
G. T. Ewan
Keyword(s):  
Gamma Ray ◽  
Transition Probabilities ◽  
Unified Model ◽  
Distance Method ◽  
Mixing Ratios ◽  
Mean Lifetime ◽  
Recoil Distance ◽  
The Mean ◽  
The Absolute ◽  
Mean Lifetimes

The 3/2+, 975 keV level in 25Mg and the 945 keV level in 25Al were populated in the 2H(24Mg,pγ)25Mg and 2H(24Mg,nγ)25Al reactions respectively and their mean lifetimes for gamma-ray decay were measured by the recoil-distance method. The mean lifetime of the 975 keV level in 25Mg is 14.6 ± 1.5 ps and that of the 945 keV level in 25Al is 6.2 ± 1.6 ps. Using previously measured branching and mixing ratios, the absolute M1 and E2 transition probabilities have been obtained and are compared with predictions of the unified model.

LIFETIMES OF THE 16O 6.13-MeV LEVEL AND THE 17O 0.871-MeV LEVEL

1965 ◽  
Vol 43 (9) ◽  
pp. 1563-1573 ◽  
Author(s):  
T. K. Alexander ◽  
K. W. Allen
Keyword(s):  
Doppler Shift ◽  
Gamma Ray ◽  
Doppler Shift Attenuation ◽  
The Mean ◽  
Data Yield ◽  
Gamma Ray Detector ◽  
Mean Lifetimes

The mean lifetimes of the 0.871-MeV state of 17O(E2) and the 6.13-MeV state of 16O(E3) have been measured by a new recoil method using a Ge(Li) gamma-ray detector. The data yield mean lifetimes of (2.33 ± 0.27) × 10−10 and (2.5 ± 0.2) × 10−11 sec for the states in 17O and 16O respectively. The recoil method is generally applicable to the measurement of lifetimes greater than about 5 × 10−12 sec and provides a technique for a region of time where neither direct electronic timing nor Doppler-shift attenuation methods are accurate.

Band Structure in 21Ne

1972 ◽  
Vol 50 (12) ◽  
pp. 1286-1294 ◽  
Author(s):  
A. A. Pilt ◽  
R. H. Spear ◽  
R. V. Elliott ◽  
D. T. Kelly ◽  
J. A. Kuehner ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Band Structure ◽  
Linear Polarization ◽  
Negative Parity ◽  
Mixing Ratios ◽  
Decay Branch ◽  
Nilsson Model ◽  
Γ Rays ◽  
Model Evidence ◽  
Γ Ray

The 18O(α,nγ) reaction at α-particle bombarding energies of 5.2 and 6.1 MeV was used to study the levels in 21Ne below 4 MeV excitation. A combination of γ-ray angular distribution and linear polarization measurements using a single crystal Ge(Li) polarimeter confirmed the spins and parities of the 1747 and 2867 keV states to be 7/2+ and 9/2+ respectively and assigned negative parity to the J = 3/2 level at 3663 keV and J = 5/2 level at 3886 keV. The state at 3735 keV was shown to have Jπ = 5/2+. Values of the multipole mixing ratios of γ rays deexciting these states were found to be consistent with previous measurements. A γ–γ coincidence experiment revealed the existence of a (1.8 ± 0.7)% decay branch of the 3886 keV level to the 2790 keV level. The results are interpreted in terms of the Nilsson model. Evidence for the existence of a Kπ = 1/2− band based on a hole in the 1p1/2 shell is given.

Temperature Dependences in the O + OH → O2 + H Reaction. Quasiclassical Trajectory Calculation

1993 ◽  
Vol 58 (2) ◽  
pp. 234-243 ◽  
Author(s):  
Viliam Klimo ◽  
Martina Bittererová ◽  
Stanislav Biskupič ◽  
Ján Urban ◽  
Miroslav Micov
Keyword(s):  
Temperature Dependence ◽  
Energy Surface ◽  
Analytical Form ◽  
Mean Values ◽  
Quantum Numbers ◽  
Mean Lifetime ◽  
Temperature Dependences ◽  
Quasiclassical Trajectory Calculation ◽  
The Mean ◽  
Combustion Processes

The reaction O + OH → O2 + H in conditions of combustion of hydrocarbons and polymers was modelled by using the method of quasiclassical trajectories. The potential energy surface was determined by the multiconfiguration interaction method and fitted with the analytical form of the extended LEPS function. Attention was paid to the mean values of the vibrational and rotational quantum numbers of O2 molecules and their temperature dependence. The temperature dependence of the mean lifetime of the OOH collision complex was also examined. The calculated rate constants were analyzed and compared with the experimental data over the temperature region of the combustion processes.

Approximate calculation of the mean energy of electrons produced by γ-rays in an ionization chamber

Atomic Energy ◽  
1961 ◽  
Vol 9 (2) ◽  
pp. 642-645
Author(s):  
A. K. Wal'ter ◽  
M. L. Gol'din ◽  
V. I. Slavin
Keyword(s):  
Ionization Chamber ◽  
Approximate Calculation ◽  
Γ Rays ◽  
The Mean

scholarly journals On the Absoluteness of Time

2017 ◽  
Vol 9 (3) ◽  
pp. 46
Author(s):  
Carmine Cataldo
Keyword(s):  
Analytical Solutions ◽  
Relativistic Corrections ◽  
Mean Lifetime ◽  
The Mean

This paper aims to qualitatively summarize the results up until now obtained in investigating the compatibility between the absoluteness of time and several well-known phenomena, such as the alleged increase of the mean lifetime of muons and the so-called relativistic corrections for GPS, whose explanation is commonly provided by resorting to Einstein’s Relativity. To make the discussion more flowing, we have herein preferred to completely avoid the writing of equations. All the analytical solutions, as well as several explicative figures, can be found in the first six articles cited in the references, drafted by the same author of this manuscript.

A Formula for the Mean Lifetime of Metapopulations in Heterogeneous Landscapes

2002 ◽  
Vol 159 (5) ◽  
pp. 530-552 ◽  
Author(s):  
Karin Frank ◽  
Christian Wissel
Keyword(s):  
Heterogeneous Landscapes ◽  
Mean Lifetime ◽  
The Mean
Sign in / Sign up

Export Citation Format

Share Document