scholarly journals Prompt Response Function (PRF) of Lifetime Measurement in the 2+ State of 192Os Nuclei Energy Levels from Triple-Gamma Coincidence Techniques

2020 ◽  
pp. 257-261
Author(s):  
Terver Daniel ◽  
Stanimir Kisyov ◽  
Patrick Regan ◽  
Nicu Marginean ◽  
Zsolt Podolyak ◽  
...  
Keyword(s):  
Response Function ◽  
Half Life ◽  
Energy Levels ◽  
Mean Value ◽  
Prompt Gamma ◽  
Difference Spectra ◽  
Gamma Coincidence ◽  
Gamma Transitions ◽  
Neutron Transfer Reaction ◽  
Prompt Response

The effective prompt response function full width at half maximum, PRF FWHM of 637 ps (obtained from the prompt gamma pairs of 477 keV and 700 keV associated with the yrast 2+ state in 206Po), and 1007 ps (obtained from the Compton gamma pairs of 189 keV and 237 keV associated with the 192Os(18O,16O)194Os 2 neutron transfer reaction) were used in fitting the time difference spectra obtained from the gamma coincident pairsof 206 keV and 374 keV in a symmetrised LaBr3(Ce) associated with the gamma transitions in 192Os, using the Half-life program. The values of half-life measured by fitting these PRF FWHM of 637 ps and 1007 ps separately show an excellent agreement of 282(16) ps and 272(21) ps, respectively, which correspond to the global half-life value of 282(4) ps for the 192Os. The mean value of 277(12) ps from these two measurements was used in calculating the B(E2; IL ->IL-2) of 4233(114) e2fm4, which is equivalent to be 81(19) W.u.

Low-energy levels and gamma transitions inCo58

1975 ◽  
Vol 11 (3) ◽  
pp. 1042-1047 ◽  
Author(s):  
B. J. Brunner ◽  
R. G. Arns ◽  
S. E. Caldwell ◽  
C. M. Rozsa ◽  
J. W. Smith ◽  
...  
Keyword(s):  
Energy Levels ◽  
Low Energy ◽  
Gamma Transitions

METABOLISM OF [4-14C]LYNESTRENOL IN MAN

1968 ◽  
Vol 42 (2) ◽  
pp. 337-343 ◽  
Author(s):  
SORAYA KAMYAB ◽  
K. FOTHERBY ◽  
A. I. KLOPPER
Keyword(s):  
Phenolic Compounds ◽  
Enzymatic Hydrolysis ◽  
Half Life ◽  
Human Subjects ◽  
Free Fraction ◽  
Urinary Metabolites ◽  
Polar Compounds ◽  
Mean Value ◽  
Biological Half Life ◽  
Chromatographic Evidence

SUMMARY After the administration of [4-14C]lynestrenol (17α-ethynyl-19-nor-androst-4-en-17β-ol) to 7 human subjects 31·–57·6% of the dose, whether administered orally or i.v., was excreted in the urine within 5 days. The biological half-life of radioactivity was 26·5 hr. After acid and enzymatic hydrolysis, 58·7 and 45·6% respectively of the urinary radioactivity was extractable. About 10% of the urinary metabolites were excreted as sulphate conjugates. A mean value of 1·75% of the administered dose was converted to phenolic compounds. The metabolites in the free fraction and enzymehydrolysed extract of urine were almost entirely polar compounds, whereas 70% of the metabolites in the sulphate fraction were much less polar. The chromatographic evidence showed that hydroxylation of lynestrenol must have occurred at two points in the molecule. Plasma radioactivity decreased more rapidly than after administration of norethisterone.

THE DECAY OF Pm151

1963 ◽  
Vol 41 (1) ◽  
pp. 57-82 ◽  
Author(s):  
D. G. Burke ◽  
M. E. Law ◽  
M. W. Johns
Keyword(s):  
Half Life ◽  
Decay Scheme ◽  
Internal Conversion ◽  
Decay Energy ◽  
Gamma Coincidence ◽  
Coincidence Measurements

The radiations from Pm151 have been studied by external and internal conversion measurements and electron–electron, electron–beta, electron–gamma, and beta–gamma coincidence experiments. Thirty-six transitions have been identified. A decay scheme incorporating 30 of these has been established by energy and coincidence measurements with levels in Sm151 at 0, 0.0048, 0.0658, 0.0697, 0.0915, 0.1048, 0.1677, 0.1684, 0.2090, 0.3239, 0.3449, 0.4445, 0.741, and 0.821 Mev. The half-life of the 0.0048-Mev level is (19 ± 10) × 10−9 sec. The total decay energy is 1.195 ± 0.010 Mev.

Study of Delayed States in 94Nb, 108Ag, and 110Ag

1971 ◽  
Vol 49 (6) ◽  
pp. 747-755 ◽  
Author(s):  
S. C. Gujrathi ◽  
J. M. d'Auria ◽  
R. G. Korteling
Keyword(s):  
High Resolution ◽  
Level Scheme ◽  
Half Life ◽  
Gamma Transition ◽  
Low Energy ◽  
X Ray ◽  
Upper Limits ◽  
Energy Gamma ◽  
Gamma Transitions ◽  
First Time

The lifetimes and energies associated with low-energy gamma transitions from the 93Nb(n,γ)94Nb, 107Ag(n,γ)108Ag, and 109Ag(n,γ)110Ag reactions have been studied using a high-resolution Ge(Li) X-ray spectrometer. New weak transitions are observed in the decay of 110Ag at 30.84, 38.19, 41.78, and 136.65 keV, while intense gamma transitions at 105.6, 235.8, and 266.95 keV are resolved into doublets. The half-life of the state involving the intense 117.47 keV transition in 110Ag and the 215 keV transition in 108Ag is confirmed as 36.5 ± 2.0 ns and 54 ± 8 ns, respectively, while a new delayed state associated with the gamma transition of 99.404 keV (T1/2 = 30 ± 5 ns) in 94Nb is observed for the first time. The upper limits for the half-lives involving most of the intense transitions in all the three isotopes are also reported. A level scheme is proposed and discussed for 108Ag.

scholarly journals Testing the modified dependence of the radiative strength function on different excitation energies in the light nucleus 28Al

2018 ◽  
Vol 39 (1) ◽  
pp. 47-63
Author(s):  
D. Knezevic ◽  
N. Jovancevic ◽  
A. M. Sukhovoj ◽  
L.V. Mitsyna
Keyword(s):  
Radiative Capture ◽  
Level Density ◽  
Strength Function ◽  
Mean Value ◽  
Excitation Energies ◽  
Radiative Strength Function ◽  
The Mean ◽  
Strength Functions ◽  
Gamma Transitions ◽  
New Hypothesis

Abstract The spectrum of random functions of level density as well as radiative strength functions of dipole E1- and M1-transitions of 28Al were determined. Obtained functions can reproduce very precisely the intensity of the two-step cascade following the radiative capture of thermal neutrons for a given energy of the primary transitions. The density of the observed intermediate levels can be reproduced correctly using the mean value of these functions. In this work we proposed a new hypothesis about the dependence of radiative strength functions for gamma-transitions in heated nucleus on the energy of excited levels. The results provide a solid basis that this new hypothesis allows to get realistic estimation on the parameters of nuclear structure in any nucleus, including the light ones.

scholarly journals ON THE STABILITY OF PERIODICALLY TIME-DEPENDENT QUANTUM SYSTEMS

2008 ◽  
Vol 20 (06) ◽  
pp. 725-764 ◽  
Author(s):  
P. DUCLOS ◽  
E. SOCCORSI ◽  
P. ŠŤOVÍČEK ◽  
M. VITTOT
Keyword(s):  
Transition Probabilities ◽  
Initial Conditions ◽  
Energy Levels ◽  
Sufficient Conditions ◽  
Energy Operator ◽  
Mean Value ◽  
Quantum Systems ◽  
Time Dependent ◽  
Dense Subspace ◽  
Periodically Driven

The main motivation of this article is to derive sufficient conditions for dynamical stability of periodically driven quantum systems described by a Hamiltonian H(t), i.e. conditions under which it holds true sup t ∈ ℝ|〈ψt, H(t)ψt〉| < ∞ where ψt denotes a trajectory at time t of the quantum system under consideration. We start from an analysis of the domain of the quasi-energy operator. Next, we show, under certain assumptions, that if the spectrum of the monodromy (Floquet) operator U(T, 0) is pure point then there exists a dense subspace of initial conditions for which the mean value of the energy is uniformly bounded in the course of time. Further, we show that if the propagator admits a differentiable Floquet decomposition then ‖H(t)ψt‖ is bounded in time for any initial condition ψ0, and one employs the quantum KAM algorithm to prove the existence of this type of decomposition for a fairly large class of H(t). In addition, we derive bounds uniform in time on transition probabilities between different energy levels, and we also propose an extension of this approach to the case of a higher order of differentiability of the Floquet decomposition. The procedure is demonstrated on a solvable example of the periodically time-dependent harmonic oscillator.

METABOLIC CLEARANCE OF HUMAN CHORIONIC GONADOTROPHIN ADMINISTERED TO NON PREGNANT WOMEN

1968 ◽  
Vol 59 (4) ◽  
pp. 579-594 ◽  
Author(s):  
L. Wide ◽  
E. Johannisson ◽  
K.-G. Tillinger ◽  
E. Diczfalusy
Keyword(s):  
Plasma Concentration ◽  
Half Life ◽  
Life Time ◽  
Mean Value ◽  
Chorionic Gonadotrophin ◽  
Human Chorionic Gonadotrophin ◽  
Metabolic Clearance ◽  
Initial Plasma ◽  
Large Single Dose ◽  
Bioassay Data

ABSTRACT A large single dose (94 000 to 131 000 IU) of human chorionic gonadotrophin (HCG) was administered intravenously to three amenorrhoeic women and the plasma levels and urinary elimination of HCG were followed by a bioassay method and a radioimmunoassay procedure in parallel. There was a close agreement between the estimates of HCG obtained by the two methods in the urine, but not in the plasma, where bioassays gave significantly (P < 0.001) higher estimates of potency than immunoassays. The disappearance rate of the injected HCG from the plasma was calculated on the assumption that the logarithm of the plasma concentration of HCG is linearly related to the time elapsed following its administration. There was a satisfactory parallelism between the regression lines obtained by the two methods. The half-life time of administered HCG in circulating plasma varied between 6 and 10 hours, with a mean value of 8 hours. From the relationship of the initial plasma concentration and dose administered, the plasma distribution volume of the hormone was tentatively calculated. The calculated plasma volumes (1664 ml from bioassays and 3680 ml from immunoassays) suggested that the bioassays gave most probably an overestimate and the immunoassays an underestimate of the HCG present in the plasma. On the basis of different assumptions it was calculated that the metabolic clearance rate of HCG was around 4 ml/min. The urinary excretion of the administered HCG by the three subjects amounted to 21 to 22 per cent of the injected material, estimated both by the bioassay and immunoassay methods. The renal clearance of the injected hormone was 0.36 ml/min when calculated from the bioassay data and 0.70 ml/min on the basis of immunoassays. Since the half-life time of circulating HCG is considerably longer than that reported for human luteinising hormone of pituitary origin, it should be realized that repeated daily injections of HCG will result in a progressive accumulation of the hormone in the circulation.

High energy levels of 144Nd excited in the decay of 144Pm

1968 ◽  
Vol 46 (19) ◽  
pp. 2189-2192 ◽  
Author(s):  
J. Barrette ◽  
S. Monaro ◽  
S. Santhanam ◽  
S. Markiza
Keyword(s):  
Excited States ◽  
Energy Levels ◽  
High Energy ◽  
Gamma Coincidence ◽  
Coincidence Measurements

Gamma–gamma coincidence measurements, carried out with a 7.6 cm × 7.6 cm NaI(Tl) crystal and a 30 cm3 Ge–Li detector, have been performed to look for excited states in 144Nd higher than the known level at 1789 keV. These measurements definitely establish the existence of a level at 2093.11 keV and suggest the placing of another level at 2204.74 keV. Furthermore, an E3 transition deexciting the 1510.14-keV level seems to be present.

DEEP LEVELS DUE TO VACANCY PAIRS IN SILICON

1989 ◽  
Vol 03 (06) ◽  
pp. 863-870 ◽  
Author(s):  
HONGQI XU ◽  
U. LINDEFELT
Keyword(s):  
Electronic Structure ◽  
Band Gap ◽  
State Energy ◽  
Energy Levels ◽  
Mean Value ◽  
Deep Levels ◽  
Nearest Neighbour ◽  
Recursion Method ◽  
The Mean ◽  
The Many

The recursion method is used to investigate the electronic structure of undistorted vacancy pairs in silicon up to the seventh nearest-neighbour divacancy. The many energy levels associated with these vacancy pairs in and around the band gap region are calculated. The results of the calculation show that the strength of the interaction between a pair of vacancies depends as much on their relative positions as on the inter-vacancy distance, but the mean value of the gap-state energy levels remains essentially constant at the monovacancy level.

THYROXINE SECRETION RATE IN THE HORSE IN VARIOUS PHYSIOLOGICAL STATES

1967 ◽  
Vol 39 (3) ◽  
pp. 313-320 ◽  
Author(s):  
C. H. G. IRVINE
Keyword(s):  
Half Life ◽  
Mean Value ◽  
Secretion Rate ◽  
Volume Distribution ◽  
Adaptation To Cold ◽  
The Mean ◽  
In Pregnancy

SUMMARY Studies on the rate of thyroxine secretion (t.s.r.) in the horse, as measured from degradation of labelled thyroxine, are reported. In the resting horse, the mean t.s.r. was 0·49 mg./453·6 kg. (1000 lb.), with a mean value of PBI of 1·80 μ./100 ml., volume distribution of 60 1., and a half-life of 2·31 days. Partly and fully trained horses showed increases of 38% and 65% in t.s.r. associated with lower values for PBI and a greatly decreased half-life. During adaptation to cold, there was an increase of 66% in t.s.r. In horses adapted to cold, t.s.r. was increased by 17%. In pregnancy, the mean increase in t.s.r. of 18% was not statistically significant.

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