scholarly journals First results in the study of level scheme for ¹⁷²Yb based on gamma-gamma coincidence spectrometer

2016 ◽  
Vol 6 (4) ◽  
pp. 26-31
Author(s):  
Ngoc Anh Nguyen ◽  
Xuan Hai Nguyen ◽  
Dinh Khang Pham ◽  
Huu Thang Ho
Keyword(s):  
Level Scheme ◽  
Level Density ◽  
Strength Function ◽  
Nuclear Research ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Nuclear Research Institute ◽  
Gamma Coincidence ◽  
First Results ◽  
Coincidence Spectrometer

Nuclear level scheme permits to determine nuclear level density, gamma strength function, and to evaluate nuclear models. In comparison to light nuclei, the structure of heavy nuclei is much more complicated because of their strong deformation. In order to study nuclear level scheme, gamma – gamma coincidence spectrometer with advantages of low Compton background and the ability of identifying correlated gamma transitionshas been often used. This paper presents the first results of an experimentalstudy of level scheme of 172Yb using gamma – gamma coincidence spectrometer at the Dalat Nuclear Research Institute.

scholarly journals Updated nuclear level density parameters of 153Sm nucleus within the back-shifted Fermi gas model

2021 ◽  
Vol 63 (1) ◽  
pp. 6-10
Author(s):  
Ngoc Anh Nguyen ◽  
◽  
Xuan Hai Nguyen ◽  
Quang Hung Nguyen ◽  
Tan Phuc Le ◽  
...  
Keyword(s):  
Level Scheme ◽  
Level Density ◽  
Energy Parameter ◽  
Nuclear Research ◽  
Fermi Gas ◽  
Reference Database ◽  
Density Parameter ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Level Density Parameter

The present work re-evaluates the level density parameter a, asymptotic level density parameter aasy, and back-shifted energy parameter E1 within the back-shifted Fermi gas model (BSFG) for the 153Sm nucleus. This reevaluation is based on the experimental nuclear level scheme extracted from the ENSDF library, the average level spacing at the neutron binding energy (D0 value), and the latest updated nuclear level scheme obtained from an experimental gamma cascade experiment, which was performed at the Dalat Nuclear Research Reactor using the thermal neutron beam. The updated values of the BSFG level parameters are: (1) a=18.09±0.25 MeV-1and E1=-0.92±0.07 MeV for the energy-independent level density parameter; and (2) aasy=15.00±0.20 MeV-1and E1=-0.81±0.08 MeV for the energy-dependent level density parameter. It has been found that the total nuclear level densities calculated using these updated parameters agree with the experimental data better than those using parameters taken from the nuclear reference database RIPL-3. These updated parameters are more accurate and reliable than those extracted from RIPL-3 and are, therefore, highly recommended for all the applications hereafter.

scholarly journals Level studies of 73As via 73Ge(p, nγ)73As reaction and density of discrete levels in 73As

2009 ◽  
Vol 24 (2) ◽  
pp. 82-85 ◽  
Author(s):  
Aziz Behkami ◽  
Rohallah Razavi ◽  
Tayeb Kakavand
Keyword(s):  
Proton Beam ◽  
Excited States ◽  
Level Scheme ◽  
Level Density ◽  
Fermi Gas ◽  
Temperature Model ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Level Densities ◽  
Experimental Level

The excited states of 73As have been investigated via the 73Ge(p, n?)73As reaction with the proton beam energies from 2.5-4.3 MeV. The parameters of the nuclear level density formula have been determined from the extensive and complete level scheme for 73As. The Bethe formula for the back-shifted Fermi gas model and the constant temperature model are compared with the experimental level densities.

scholarly journals An algorithms to improve the energy resolution of two-step cascade spectrum

2020 ◽  
Vol 4 (4) ◽  
pp. First
Author(s):  
Nguyen Ngoc Anh ◽  
Nguyen Xuan Hai ◽  
Hồ Hữu Thắng ◽  
Phan Bao Quoc Hieu ◽  
Truong Van Minh
Keyword(s):  
Energy Resolution ◽  
Spectrum Analysis ◽  
Nuclear Research ◽  
Final States ◽  
Nuclear Research Institute ◽  
Peak Deconvolution ◽  
Compound State ◽  
Gamma Spectrum Analysis ◽  
Gamma Coincidence ◽  
Coincidence Spectrometer

The present paper proposes an algorithm to improve the energy resolution of two-step cascade spectrum. The energy resolution plays an important role in the domain of gamma spectrum analysis. The better the energy resolution is, the better the ability of peak resolving is. The algorithm is constructed based on an analyze of energy resolution of the summation amplitude of coincident pulses spectrometer using the analogue technique. The algorithm proposed has been tested on some two-step cascade spectra of 164Dy nucleus obtained from the (n, ) reaction experiment using the gamma – gamma coincidence spectrometer at Dalat Nuclear Research Institute. Two-step cascade spectra corresponding to the cascade decays from the compound state to final states whose energies are 0, 74, and 242 keV have been evaluated. The results obtained show that the energy resolution of the two-step cascade spectrum has been reduced by 1.05 to 2.04 times within the energy range of 586 to 6830 keV. Our algorithm can therefore be applied to improve the ability of peak deconvolution, the accuracy, and the realibility in analyzing two-step cascade spectra.

scholarly journals Nuclear level density andγ-ray strength function of43Sc

2012 ◽  
Vol 85 (6) ◽  
Author(s):  
A. Bürger ◽  
A. C. Larsen ◽  
S. Hilaire ◽  
M. Guttormsen ◽  
S. Harissopulos ◽  
...  
Keyword(s):  
Level Density ◽  
Strength Function ◽  
Nuclear Level Density ◽  
Nuclear Level

scholarly journals Level studies of 93Mo via 93Nb(p, nγ)93Mo reaction and density of discrete levels in 93Mo

2011 ◽  
Vol 26 (1) ◽  
pp. 69-73 ◽  
Author(s):  
Rohallah Razavi ◽  
Tayeb Kakavand
Keyword(s):  
Proton Beam ◽  
Excited States ◽  
Level Scheme ◽  
Level Density ◽  
Fermi Gas ◽  
Temperature Model ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Level Densities ◽  
Experimental Level

The excited states of 93Mo have been investigated via the 93Nb(P,n?)93Mo reaction with proton beam energies of 2.5-4.3 MeV. The parameters of the nuclear level density formula were determined from the extensive and complete level scheme of 93Mo. The Bethe formula for the back-shifted Fermi gas model and the constant temperature model are compared with experimental level densities.

scholarly journals Puzzle of collective enhancement in the nuclear level density

2021 ◽  
pp. 136173
Author(s):  
Deepak Pandit ◽  
Balaram Dey ◽  
Srijit Bhattacharya ◽  
T.K. Rana ◽  
Debasish Mondal ◽  
...  
Keyword(s):  
Level Density ◽  
Nuclear Level Density ◽  
Nuclear Level
Sign in / Sign up

Export Citation Format

Share Document