Developing the Recoil Distance Doppler-Shift technique towards a versatile tool for lifetime measurements of excited nuclear states

2012 ◽  
Vol 67 (3) ◽  
pp. 786-839 ◽  
Author(s):  
A. Dewald ◽  
O. Möller ◽  
P. Petkov
Keyword(s):  
Doppler Shift ◽  
Lifetime Measurements ◽  
Versatile Tool ◽  
Recoil Distance ◽  
Shift Technique

LIFETIME MEASUREMENTS IN 134Pr AND CHIRALITY IN NUCLEI

2006 ◽  
Vol 15 (07) ◽  
pp. 1531-1540 ◽  
Author(s):  
D. TONEV ◽  
P. PETKOV ◽  
D. L. BALABANSKI ◽  
G. DE ANGELIS ◽  
A. GADEA ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Transition Probabilities ◽  
Experimental Results ◽  
Lifetime Measurements ◽  
Evaporation Reaction ◽  
Doppler Shift Attenuation ◽  
Recoil Distance ◽  
Reduced Transition Probabilities ◽  
Fusion Evaporation Reaction

Lifetimes of exited states in 134 Pr were measured be means of the recoil distance Doppler-shift and Doppler-shift attenuation techniques. The experiments were performed at IReS, Strasbourg using the EUROBALL IV spectrometer, in conjunction with the inner BGO ball and the Cologne coincidence plunger apparatus. Exited states in 134 Pr were populated in the fusion-evaporation reaction 119 Sn (19 F , 4 n )134 Pr . Reduced transition probabilities in 134 Pr are compared to the predictions of the two quasiparticle+triaxial rotor and interacting boson fermion-fermion models. The experimental results do not support the presence of static chirality in 134 Pr underlying the importance of shape fluctuations. Only within a dynamical context the presence of intrinsic chirality in 134 Pr can be supported.

Coincidence recoil-distance Doppler-shift lifetime measurements in128Ba

2000 ◽  
Vol 62 (1) ◽  
Author(s):  
P. Petkov ◽  
A. Dewald ◽  
R. Kühn ◽  
R. Peusquens ◽  
D. Tonev ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Lifetime Measurements ◽  
Recoil Distance

scholarly journals Lifetime measurements in 105Sn: the puzzle of B(E2) strengths in Sn isotopes

2019 ◽  
Vol 223 ◽  
pp. 01048
Author(s):  
Giorgia Pasqualato ◽  
Andrea Gottardo ◽  
Alain Goasduff ◽  
Josè Javier Valiente Dobón ◽  
Daniele Mengoni
Keyword(s):  
Excited States ◽  
Experimental Technique ◽  
Systematic Study ◽  
Doppler Shift ◽  
Isotopic Chain ◽  
Lifetime Measurements ◽  
Preliminary Results ◽  
Shell Closures ◽  
Recoil Distance ◽  
Good Agreement

One of the most studied case to explore the evolution of shell closures far from stability is the doubly-magic and self-conjugated 100Sn nucleus. Information on its doubly-magic nature can be extracted fromthe systematic study of the tin isotopic chain. In this context, the lifetimes of the neutron deficient 105Sn have been investigated with the coincidence Recoil Distance Doppler Shift (RDDS) technique throughthe reaction 50Cr(58Ni,2pn)105Sn. Preliminary results concerning the lifetimesof 105In excited states are in good agreement with the adopted lifetimes, demonstrating the feasibility to extract lifetimes with this experimental technique.

Lifetime measurements of the six lowest lying levels in 35Cl

1969 ◽  
Vol 47 (12) ◽  
pp. 1295-1306 ◽  
Author(s):  
F. Ingebretsen ◽  
T. K. Alexander ◽  
O. Häusser ◽  
D. Pelte
Keyword(s):  
Gamma Rays ◽  
Doppler Shift ◽  
Gamma Ray ◽  
Level Structure ◽  
Branching Ratios ◽  
Distance Method ◽  
Lifetime Measurements ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Recoil Distance

The energies, gamma-ray branching ratios, and mean nuclear lifetimes of the six lowest lying levels in 35Cl have been measured. Gamma rays following the reaction 32S(α,pγ)35Cl were studied using two Ge(Li) detectors with 15-cm3 and 40-cm3 active volumes respectively. The lifetimes of the five lowest lying levels were measured using the Doppler shift attenuation method, with the results: 1219 keV, [Formula: see text]; 1763 keV, 0.55 ± 0.15 ps; 2646 keV, 0.30 ± 0.09 ps; 2695 keV, <0.03 ps; and 3003 keV, <0.05 ps. The lifetime of the 3163-keV level was measured to be 60 ± 7 ps, using a recoil distance method. The level structure is discussed taking into account known lifetimes, spins, parities, and gamma-ray mixing ratios.

Coincidence recoil-distance Doppler-shift lifetime measurements in129,130Bawith EUROBALL Ge cluster detectors

2000 ◽  
Vol 61 (4) ◽  
Author(s):  
O. Stuch ◽  
K. Jessen ◽  
R. S. Chakrawarthy ◽  
A. Dewald ◽  
R. Kühn ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Lifetime Measurements ◽  
Recoil Distance

scholarly journals Nuclear structure in the neutron-deficient Sn nuclei TKEL effects on lifetime measurements

2019 ◽  
Vol 223 ◽  
pp. 01060 ◽  
Author(s):  
Marco Siciliano ◽  
José-Javier Valiente-Dobón ◽  
Alain Goasduff
Keyword(s):  
Excited States ◽  
Transfer Reaction ◽  
Electromagnetic Properties ◽  
Isotopic Chain ◽  
Lifetime Measurements ◽  
Experimental Limitation ◽  
Recoil Distance ◽  
First Time ◽  
Shift Technique ◽  
Kinetic Energy Loss

The presence of seniority-like isomers along the Z = 50 isotopic chain have been an experimental limitation to the investigation of the electromagnetic properties of the low-lying states in the light Sn nuclei. Combining a multi-nucleon transfer reaction with the Recoil-Distance Doppler-Shift technique, the lifetimes of the 21+ and 41+ excited states have been directly measured in the neutron-deficient 106, 108Sn isotopes for the very first time. The emitted γ rays were detected by the AGATA array, while the reactionproducts were uniquely identified by the VAMOS++ magnetic spectrometer. The control of the direct feeding of the statesby gating on the Total Kinetic Energy Loss, together with the unique capabilities of the two spectrometers, was crucial for the measurementin 108Sn.

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