scholarly journals Lifetimes and electromagnetic transition strength in 124Ba

2018 ◽  
Vol 194 ◽  
pp. 03004
Author(s):  
Mariya Trichkova ◽  
Marcel Beckers ◽  
Kalin Gladnishki ◽  
Alfred Dewald ◽  
Andrey Blazhev ◽  
...  
Keyword(s):  
Excited States ◽  
Doppler Shift ◽  
Structural Changes ◽  
Decay Curve ◽  
Transition Strength ◽  
Electromagnetic Transition ◽  
Coincidence Data ◽  
Curve Method ◽  
Recoil Distance ◽  
Γ Ray

Lifetimes of excited states of 124Ba were measured by the Recoil Distance Doppler Shift (RDDS) technique. The γ-ray coincidence data were analysed by the Differential Decay Curve method (DDCM). The trend of the experimentally deduced normalized B(E2) values reveals a drop at the 8+1 state, which may be caused by structural changes in the backbending region.

scholarly journals 128Xe: Test for E(5) Symmetry through DDCM and GOSIA Analysis

2019 ◽  
Vol 18 ◽  
pp. 7
Author(s):  
T. Konstantinopoulos ◽  
... Et al.
Keyword(s):  
Excited States ◽  
Inverse Kinematics ◽  
Decay Curve ◽  
Computer Code ◽  
The Novel ◽  
Matrix Elements ◽  
Accelerator Facility ◽  
Lifetime Measurements ◽  
Curve Method ◽  
Γ Ray

Lifetime measurements in 128Xe have been undertaken at the JYFL accelerator facility using the novel Coulex-plunger in inverse kinematics technique [1], [2]. Excited states in 128Xe were populated by the natFe(128Xe, 128Xe*) reaction at E(128Xe)=525 MeV and the subsequent de-excitations were detected in the JUROGAM γ-ray array. Two independent analyses of the data were performed. Firstly the Differential Decay Curve Method (DDCM) [3] was applied to determine lifetimes of the excited states. Secondly, matrix elements and their corresponding B(E2) values, were extracted using the computer code GOSIA [4]. The results are presented and compared with the adopted values. Also, B(E2) values obtained from this work are compared to the values predicted by the E(5) critical-point symmetry, since 128Xe has been proposed as a candidate for E(5) symmetry [5].

scholarly journals Search for E(5) Symmetry in 102Pd

2019 ◽  
Vol 18 ◽  
pp. 169
Author(s):  
S. F. Ashley ◽  
... Et al.
Keyword(s):  
Excited States ◽  
Decay Curve ◽  
Interacting Boson Model ◽  
Yrast Band ◽  
Evaporation Reaction ◽  
Curve Method ◽  
Shift Experiment ◽  
Recoil Distance ◽  
Boson Model ◽  
Fusion Evaporation Reaction

Lifetimes of the excited states in the yrast band of 102Pd have been deter- mined using the Recoil-Distance Doppler Shift experiment at INFN, Labo- ratori Nazionali di Legnaro. Excited states in 102Pd were populated by the 92Zr(13C,3n)102Pd fusion-evaporation reaction. Lifetimes were deduced using the Differential Decay Curve method and the corresponding B(E2) values were compared to the E(5) critical-point symmetry, and also the U(5) and O(6) limits of the Interacting Boson Model-1. It is evident that 102Pd agrees poorly with the predicted E(5) symmetry but has a very good (and somewhat surprising) agreement with the O(6) limit.

EVIDENCE FOR X(5) CRITICAL POINT SYMMETRY IN 128Ce

2006 ◽  
Vol 15 (08) ◽  
pp. 1735-1740 ◽  
Author(s):  
D. L. BALABANSKI ◽  
K. A. GLADNISHKI ◽  
G. LO BIANCO ◽  
A. SALTARELLI ◽  
N. V. ZAMFIR ◽  
...  
Keyword(s):  
Critical Point ◽  
Nuclear Structure ◽  
Excited States ◽  
Ground State ◽  
Doppler Shift ◽  
Point Symmetry ◽  
Yale University ◽  
Doppler Shift Attenuation ◽  
Recoil Distance ◽  
Predicted Values

Lifetimes of excited states in 128 Ce were measured using the recoil distance Doppler-shift (RDDS) and the Doppler-shift attenuation (DSAM) methods. The experiments were performed at the Wright Nuclear Structure Laboratory of Yale University. Excited states of 128 Ce were populated in the 100 Mo (32 Si ,4 n ) reaction at 120 MeV and the nuclear γ decay was measured with an array of eight Clover detectors positioned at forward and backward angles. The deduced yrast transition strengths together with the energies of the levels within the ground-state (gs) band of 128 Ce are in agreement with the predicted values for the X (5) critical point symmetry. Thus, we suggest 128 Ce as a benchmark X (5) nucleus in the mass A ≈ 130 region.

scholarly journals Measurement of Nuclear Lifetimes and B(E2) Values in 130Xe as a Test for E(5) Symmetry

2020 ◽  
Vol 19 ◽  
pp. 33
Author(s):  
T. Konstantinopoulos ◽  
Et Al.
Keyword(s):  
Excited States ◽  
Inverse Kinematics ◽  
Decay Curve ◽  
Coulomb Excitation ◽  
Computer Code ◽  
Previous Measurement ◽  
The Novel ◽  
Accelerator Facility ◽  
Curve Method

As a continuation of the previous measurement in 128Xe [1], [2], [3], another E(5) candidate, 130Xe, has been studied through the novel experimental technique Coulex-plunger in inverse kinematics. The measurements have been undertaken at the JYFL accelerator facility in Jyvaskyl ̈a, Finland. For the purpose of this experiment the Cologne plunger was coupled to the JYFL cyclotron which delivered the 130Xe beam. Excited states in 130Xe were populated by the natFe(130Xe, 130Xe*) reaction at E(130Xe)=500 MeV and the subsequent de-excitations were detected in the JUROGAM γ-ray array. By applying the well known Differential Decay Curve Method (DDCM) [4], lifetimes of the 2^+_1 and 4^+_1 excited states were determined. In addition, since the investigated nucleus is excited through the Coulomb interaction, it is possible to perform a full Coulomb excitation analysis of the data using the computer code GOSIA [5] which will allow the determination of B(E2) values of the transitions up to the 6^+_1 excited state.

scholarly journals Determination of lifetimes of nuclear excited states using the Recoil Distance Doppler Shift Method in combination with magnetic spectrometers

2017 ◽  
Vol 53 (10) ◽  
Author(s):  
M. Doncel ◽  
A. Gadea ◽  
J. J. Valiente-Dobón ◽  
B. Quintana ◽  
V. Modamio ◽  
...  
Keyword(s):  
Excited States ◽  
Doppler Shift ◽  
Shift Method ◽  
Recoil Distance
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