scholarly journals A study on the transition between seniority-type and collective excitations in 204Po and 206Po

2018 ◽  
Vol 194 ◽  
pp. 03002 ◽  
Author(s):  
Milena Stoyanova ◽  
Georgi Rainovski ◽  
Jan Jolie ◽  
Norbert Pietralla ◽  
Andrey Blazhev ◽  
...  
Keyword(s):  
Excited States ◽  
Collective Excitations ◽  
Preliminary Results ◽  
Fast Timing ◽  
Upper Limit ◽  
Systematic Behavior ◽  
The University ◽  
Fusion Evaporation Reactions

Low-lying yrast states in 204Po and 206Po have been investigated by the γ-γ fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the 197Au(11B,4n) and the 198Pt(12C,4n) fusion-evaporation reactions, respectively, at the FN-Tandem Facility at the University of Cologne. The lifetimes of the 4+1 states in both nuclei were measured, along with an upper limit for the 2+1 state in 204Po. The preliminary results are discussed in the scope of the systematic behavior of the transition strengths between yrast states in polonium isotopes.

scholarly journals Lifetime measurements in $$^{182}\hbox {Pt}$$ using $$\gamma $$–$$\gamma $$ fast-timing

2021 ◽  
Vol 57 (5) ◽  
Author(s):  
G. Häfner ◽  
A. Esmaylzadeh ◽  
J. Jolie ◽  
J.-M. Régis ◽  
C. Müller-Gatermann ◽  
...  
Keyword(s):  
Excited States ◽  
Theoretical Calculations ◽  
High Accuracy ◽  
Tandem Accelerator ◽  
Lifetime Measurements ◽  
Fast Timing ◽  
Evaporation Reaction ◽  
Configuration Mixing ◽  
The University ◽  
Fusion Evaporation Reaction

AbstractThe level lifetimes of the $$2_1^+$$ 2 1 + and $$4_1^+$$ 4 1 + states in $$^{182}\hbox {Pt}$$ 182 Pt have been re-measured employing the $$\gamma $$ γ –$$\gamma $$ γ fast-timing technique using fast $$\hbox {LaBr}_3$$ LaBr 3 (Ce) scintillators. Excited states in the nucleus of interest were populated by the fusion-evaporation reaction $$^{170}\hbox {Yb}(^{16}\hbox {O},\hbox {4n})^{182}\hbox {Pt}$$ 170 Yb ( 16 O , 4n ) 182 Pt at a beam energy of 87 MeV provided by the FN Tandem accelerator of the University of Cologne. The lifetime of the $$2_1^+$$ 2 1 + state was re-measured with high accuracy to be $$\tau = 563(12)~$$ τ = 563 ( 12 ) ps and resolves inconsistencies from previous measurements. Experimental results are compared to theoretical calculations in the framework of the sd-IBM with and without configuration mixing.

scholarly journals β-γ and isomeric decay spectroscopy of 168Dy

2018 ◽  
Vol 178 ◽  
pp. 02023
Author(s):  
G.X. Zhang ◽  
H. Watanabe ◽  
F.G. Kondev ◽  
G.J. Lane ◽  
P.H. Regan ◽  
...  
Keyword(s):  
Experimental Data ◽  
Excited States ◽  
Experimental Work ◽  
Isomeric State ◽  
Level Structure ◽  
Primary Beam ◽  
Average Intensity ◽  
Experimental Procedure ◽  
Preliminary Results ◽  
Decay Spectroscopy

This contribution will report on the experimental work on the level structure of 168Dy. The experimental data have been taken as part of the EURICA decay spectroscopy campaign at RIBF, RIKEN in November 2014. In the experiment, a 238U primary beam is accelerated up to 345 MeV/u with an average intensity of 12 pnA. The nuclei of interest are produced by in-flight fission of 238U impinging on Be target with a thickness of 5 mm. The excited states of 168Dy have been populated through the decay from a newly identified isomeric state and via the β decay from 168Tb. In this contribution, scientific motivations, experimental procedure and some preliminary results for this study are presented.

scholarly journals INSTALLATION AND PRELIMINARY RESULTS FROM A SMALL APERTURE SEISMIC ARRAY IN TRIPOLI, GREECE

2004 ◽  
Vol 36 (3) ◽  
pp. 1499 ◽  
Author(s):  
M. Pirli ◽  
Ν. Voulgaris ◽  
J. Alexopoulos ◽  
K. Makropoulos
Keyword(s):  
Body Wave ◽  
Seismic Array ◽  
Small Aperture ◽  
Preliminary Results ◽  
Seismic Waveforms ◽  
Equipment Safety ◽  
Array Calibration ◽  
Array Performance ◽  
The University ◽  
Of Greece

A small aperture seismic array was installed by the University of Athens, in the area of Tripoli, Greece, on July 16th 2003, in order to test the performance of seismic array processing in the area of Greece and assess its contribution to earthquake location, especially in offshore areas not azimuthally covered by the existing, conventional seismological networks. The array consists of four three-component seismological stations, one of them in the middle of a small, almost equilateral triangle, formed by the deployment of the other three stations. Despite the fact that array siting is a compromise of array installation criteria, equipment safety and logistics, the test character of the experiment can be served successfully. The array transfer function depicts good azimuthal coverage nonetheless the existence of side-lobes and a rather wide main lobe is characteristic of spatial aliasing and low resolution in the two-dimensional wavenumber domain. The resolvable wavenumber passband of the array permits the determination of most of the common seismic body wave phases (Pn, Pg, Sn, Sg, etc.) for local and regional events in the area of Greece. Location of recorded events was performed using slowness and backazimuth data, calculated by f-k analysis of the seismic waveforms. Preliminary results have been compared to epicentres calculated by the Geodynamic Institute of the National Observatory of Athens. Although some differences are observed, these are not significant and location results as well as overall array performance can be improved by array calibration and travel-time, azimuth and slowness correction calculations.

scholarly journals The sanctuary of Punta Stilo at Kaulonia-Monasterace (Rc, Italy): preliminary results of the close range photogrammetric surveys 2012-2013

2014 ◽  
Vol XL-5 ◽  
pp. 559-563
Author(s):  
E. Taccola ◽  
M. C. Parra ◽  
C. Ampolo
Keyword(s):  
Preliminary Results ◽  
3D Data ◽  
Close Range ◽  
The University ◽  
First Time

During the 2012–2013 excavations at the Sanctuary of Punta Stilo at Kaulonia, carried out by the University of Pisa and the Scuola Normale Superiore of Pisa, close range aerial and terrestrial photogrammetric surveys were tested for the first time. The aim of the test was to verify the accuracy of the site planimetry currently used, dating back also to a century ago. The 3D data obtained have allowed new data to be acquired for correcting and updating the mapping of the site.

CRDS study of auto-ionizing Rydberg states of argon in a microwave discharge This article is part of a Special Issue on Spectroscopy at the University of New Brunswick in honour of Colan Linton and Ron Lees.

2009 ◽  
Vol 87 (5) ◽  
pp. 575-581 ◽  
Author(s):  
B. M. van der Ende ◽  
C. Winslade ◽  
R. L. Brooks ◽  
R. H. deLaat ◽  
N. P.C. Westwood
Keyword(s):  
New Brunswick ◽  
Excited States ◽  
Microwave Discharge ◽  
Rydberg States ◽  
Spectral Lines ◽  
Optical Transitions ◽  
Single Source ◽  
Special Issue ◽  
Line Widths ◽  
The University

Optical transitions from two microwave discharge excited states of argon have been observed using cavity ring-down spectroscopy. These transitions originate on the high-lying levels, 3d[1/2] 1° and 3d[3/2] 2° , and terminate on the nf ′[5/2] Rydberg (n = 8 to 22) levels, which, except for n = 8, lie between the 2P3/2 and 2P1/2 ionization thresholds. In total, 24 such spectral lines have been observed. The quantum defect for the f ′ series has been measured and is compared to previously measured values. We observe a nearly threefold jump in line width in going from n = 8 to n = 9, below and above the 2P3/2 threshold, respectively. The line widths are broad and increase monotonically with n (above 9), in contrast to the narrowing of line widths usually observed. We cannot attribute this to a single source but conclude that collisional, quasielastic l-mixing of the nf ′[5/2] Rydberg states plays a significant role.

scholarly journals The Rise of Urbanized Landscapes in Mesopotamia: The QADIS Integrated Survey Results and the Interpretation of Multi-Layered Historical Landscapes

2019 ◽  
Vol 109 (2) ◽  
pp. 214-237 ◽  
Author(s):  
Nicolò Marchetti ◽  
Abbas Al-Hussainy ◽  
Giacomo Benati ◽  
Giampaolo Luglio ◽  
Giulia Scazzosi ◽  
...  
Keyword(s):  
Dense Network ◽  
Urbanization Process ◽  
Anthropogenic Transformation ◽  
Preliminary Results ◽  
The Core ◽  
Survey Results ◽  
The University ◽  
Artificial Water ◽  
Over Time ◽  
Archaeological Landscape

Abstract This paper draws on the preliminary results of the QADIS survey project, conducted by the University of Bologna and the Iraqi State Board of Antiquities and Heritage since 2016 in the Qadisiyah province. The project addresses phenomena related to anthropogenic transformation of landscapes in a region that was at the core of the early Mesopotamian urbanization process. Building upon the seminal work conducted by R. McC. Adams in the 1960 s and 1970 s, we implemented an integrated documentation technique to reconstruct at regional levels the changes in the dense network of human settlements and artificial water infrastructures characterizing the evolution of this archaeological landscape over time. The aim of the article is that of providing a finer-grained regional picture of 4th and 3rd millennium BC urban developments which can be useful for better conceptualizing the scale and pace of early Mesopotamian urbanism.

scholarly journals Measurement of the 3 K Cosmic Background Noise in the Far Infrared

1983 ◽  
Vol 104 ◽  
pp. 135-138 ◽  
Author(s):  
G. Dall'oglio ◽  
P. de Bernardis ◽  
S. Masi ◽  
F. Melchiorri
Keyword(s):  
Background Noise ◽  
Quantum Fluctuations ◽  
Far Infrared ◽  
Preliminary Results ◽  
Upper Limit ◽  
Cosmic Background

Quantum fluctuations of the cosmic background have been measured in the 900 to 2000 micron range (H.P.B.W.) by means of a balloon-borne correlator operating between 5 and 150 Hz. Preliminary results indicate an upper limit √<dP2> ≤ 2.1 × 10−17 watt/(cm2 srad Hz)1/2, corresponding to the noise of a blackbody at a temperature T ≤ 3.1 K at 1σ.

scholarly journals Spectroscopic and Polarimetric Observations of AC Her and UU Her

1989 ◽  
Vol 106 ◽  
pp. 296-296
Author(s):  
M.A. Nook ◽  
J.A. Cardelli ◽  
K.H. Nordsieck
Keyword(s):  
Wavelength Range ◽  
Spectral Resolution ◽  
Preliminary Results ◽  
Cassegrain Telescope ◽  
The University

We present preliminary results obtained between March and August of 1987 of a two-year spectropolarimetric study of 10 RV Tauri stars. The observations were made at the University of Wisconsin's Pine Bluff Observatory using the 36 inch cassegrain telescope with a Lyot polarimeter. The spectral resolution of the instrument was 6 A and covered the range between 4350 A and 7500 A. The polarimetry covered the same wavelength range but is binned in four broad bands at 4828 A, 5361 A, 6025 A, and 6877 A.

The radiation-induced formation of excited states of aromatic hydrocarbons in alicyclic hydrocarbons I. Yields of excited singlet and triplet state solute molecules

1975 ◽  
Vol 347 (1648) ◽  
pp. 61-73 ◽  
Keyword(s):  
Energy Transfer ◽  
Excited States ◽  
Pulse Radiolysis ◽  
Minor Role ◽  
Intersystem Crossing ◽  
Excited Singlet ◽  
Excited Triplet ◽  
Upper Limit ◽  
Radiation Induced ◽  
A Minor

The dependences on concentration of the yield of excited triplet naphthalene, G ( 3 Naph٭), and of the radiation-induced fluorescence obtained on pulse radiolysis of solutions of naphthalene in cyclopentane, cyclooctane and decalin are reported. The yields of singlet excited naphthalene, G( 1 Naph٭), formed on pulse radiolysis of these solutions have been determined by comparing the intensity of the radiation-induced fluorescence with that obtained on photo excitation and the extent of formation of 3 Naph٭ by intersystem crossing, G ( 3 Naph٭) i. s. c., is assessed. Upper limit yields of solvent excited states, G ( 1 RH٭), were determined by measuring the extent of singlet energy transfer to toluene. It is concluded that energy transfer from solvent excited states plays a minor role in the formation of excited states of aromatic solutes.

Sign in / Sign up

Export Citation Format

Share Document