scholarly journals Performing the differential decay curve method on γ-ray transitions with unresolved Doppler-shifted components

2020 ◽  
Vol 950 ◽  
pp. 162965 ◽  
Author(s):  
L. Barber ◽  
D.M. Cullen ◽  
M.M. Giles ◽  
B.S. Nara Singh ◽  
M.J. Mallaburn ◽  
...  
Keyword(s):  
Decay Curve ◽  
Curve Method ◽  
Γ Ray

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].

A development of lifetime measurement based on the differential decay curve method

2018 ◽  
Vol 29 (8) ◽  
Author(s):  
Jian Zhong ◽  
Xiao-Guang Wu ◽  
Ying-Jun Ma ◽  
Yun Zheng ◽  
Cong-Bo Li ◽  
...  
Keyword(s):  
Decay Curve ◽  
Lifetime Measurement ◽  
Curve Method

THE RATIO OF THE DIRECT TO THE CUMULATIVE YIELD OF 135Xe IN THE THERMAL NEUTRON FISSION OF 233U, 235U, 239Pu, AND 241pu

1966 ◽  
Vol 44 (1) ◽  
pp. 237-246 ◽  
Author(s):  
A. Okazaki ◽  
W. H. Walker ◽  
C. B. Bigham
Keyword(s):  
Neutron Flux ◽  
Thermal Neutron ◽  
Decay Curve ◽  
Time Shift ◽  
Cumulative Yield ◽  
Β Decay ◽  
Neutron Fission ◽  
Short Irradiation ◽  
Thermal Neutron Fission ◽  
Γ Ray

The ratio of the direct to cumulative yields of 135Xe produced in thermal neutron fission has been determined by measuring the growth and decay of this nuclide in irradiated 233U, 235U, 239Pu, and 241Pu. After a short irradiation in a low neutron flux, the amount of 135Xe increases and reaches a maximum at about 11 hours after the end of the irradiation. The direct yield of 135Xe modifies the time this maximum is reached. The ratio of the direct to cumulative yields was determined by measuring the time shift of the growth and decay curve. The amount of 135Xe was measured as a function of time after the end of irradiation by counting the 249-keV γ ray accompanying the β decay of 135Xe with a lithium-drifted germanium-diode spectrometer. The ratio of the direct to the cumulative yield was found to be 0.195 ± 0.016, 0.044 ± 0.017, 0.162 ± 0.025, and 0.070 ± 0.040 for 233U, 235U, 239Pu, and 241Pu fission respectively.

scholarly journals Lifetime measurements of yrast states in $$^{\mathbf {178}}$$Pt using the charge plunger method with a recoil separator

2021 ◽  
Vol 57 (4) ◽  
Author(s):  
J. Heery ◽  
L. Barber ◽  
J. Vilhena ◽  
B. S. Nara Singh ◽  
R.-D. Herzberg ◽  
...  
Keyword(s):  
Focal Plane ◽  
Decay Curve ◽  
Alpha Decay ◽  
Alternative Analysis ◽  
Lifetime Measurements ◽  
Lifetime Value ◽  
Charge State Distributions ◽  
Curve Method ◽  
Internal Electron ◽  
Bateman Equation

AbstractLifetime measurements in $$^{178}$$ 178 Pt with excited states de-exciting through $$\gamma $$ γ -ray transitions and internal electron conversions have been performed. Ionic charges were selected by the in-flight mass separator MARA and measured at the focal plane in coincidence with the $$4_1^+\rightarrow 2_1^+$$ 4 1 + → 2 1 + $$257\,$$ 257 keV $$\gamma $$ γ -ray transition detected using the JUROGAM 3 spectrometer. The resulting charge-state distributions were analysed using the differential decay curve method (DDCM) framework to obtain a lifetime value of 430(20) ps for the $$2_1^+$$ 2 1 + state. This work builds on a method that combines the charge plunger technique with the DDCM analysis. As an alternative analysis, ions were selected in coincidence with the $$^{178}$$ 178 Pt alpha decay ($$E_{\mathrm {alpha}} = 5.458(5)$$ E alpha = 5.458 ( 5 ) MeV) at the focal plane. Lifetime information was obtained by fitting a two-state Bateman equation to the decay curve with the lifetime of individual states defined by a single quadrupole moment. This yielded a lifetime value of 430(50) ps for the $$2_1^+$$ 2 1 + state, and 54(6) ps for the $$4_1^+$$ 4 1 + state. An analysis method based around the Bateman equation will become especially important when using the charge plunger method for the cases where utilising coincidences between prompt $$\gamma $$ γ rays and recoils is not feasible.

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.

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