scholarly journals Measurement of (n, f) and (n, xn) cross sections with surrogate reaction method

2020 ◽  
Vol 239 ◽  
pp. 01007
Author(s):  
Nanru Ma ◽  
Chengjian Lin ◽  
Huiming Jia ◽  
Xinxing Xu ◽  
Feng Yang ◽  
...  
Keyword(s):  
Compound Nucleus ◽  
Cross Sections ◽  
Transfer Reaction ◽  
Neutron Capture Reaction ◽  
Capture Reaction ◽  
Reaction Method ◽  
Angular Momenta ◽  
Important Approach ◽  
Inelastic Excitation ◽  
Spin Distributions

Surrogate reaction method is an important approach to overcome the difficulties meet in the direct measurement of neutron induced nuclear reaction. The current existing surrogate reactions generally employ the peripheral reactions such as inelastic excitation and transfer reaction where the involved angular momenta are much larger than the neutron capture reaction, which causes a difficulty in theoretical correction of spin of compound nucleus. We proposed to use capture reaction of light charged particle as the surrogate reaction, thus the spin distributions of compound nucleus in two reactions are quite similar and therefore the spin correction is not strongly desired. Based on this idea, the 239Pu(n, f) and (n, 2n) cross sections were successfully extracted by using 236U(α,, f) and (α, 2n) reactions as the surrogate reactions. The well coincidence of the present results with the data of ENDFB7 within the error bars shows the reliability of the proposed surrogate capture reaction method.

THE LEVEL SCHEME OF 171Tm STUDIED BY MULTIPLE NEUTRON CAPTURE AND THE (3He,d) REACTION

1994 ◽  
Vol 03 (02) ◽  
pp. 793-800 ◽  
Author(s):  
W. SCHAUER ◽  
M. WEBER ◽  
T. von EGIDY ◽  
R. GEORGII ◽  
J. OTT ◽  
...  
Keyword(s):  
Level Scheme ◽  
Neutron Capture ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
The Other ◽  
Neutron Capture Reaction ◽  
Capture Reaction ◽  
Model Evidence ◽  
Nuclear Levels ◽  
Phonon Model

The double neutron capture reaction 169Tm(n,γ)170Tm(n,γ)171Tm and the proton transfer reaction 170Er(3He,d)171Tm were used to study nuclear levels in 171Tm. The level scheme up to 1 MeV was confirmed and very precise level energies were determined. The results are compared with the quasiparticle-phonon model. Evidence was found, that the 1/2−[541] orbit has larger deformation than the other states.

scholarly journals Fast Neutron Capture Reaction Data Measurement of Minor Actinides for Development of Nuclear Transmutation Systems

2020 ◽  
Vol 239 ◽  
pp. 01044
Author(s):  
Tatsuya Katabuchi ◽  
Osamu Iwamoto ◽  
Jun-ichi Hori ◽  
Atsushi Kimura ◽  
Nobuyuki Iwamoto ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Cross Sections ◽  
Neutron Capture ◽  
Minor Actinides ◽  
Neutron Capture Reaction ◽  
Energy Agency ◽  
Capture Reaction ◽  
Nuclear Transmutation ◽  
Reaction Data ◽  
Capture Cross Sections

A research project entitled "study on accuracy improvement of fast-neutron capture reaction data of long-lived MAs for development of nuclear transmutation systems" is ongoing as a joint collaboration, including Tokyo Tech, Japan Atomic Energy Agency and Kyoto University in Japan. This project focuses on neutron capture reaction of minor actinides 237Np, 241Am and 243Am, in the fast neutron energy region. The final goal of this project is to improve the neutron capture cross sections utilizing a high-intensity neutron beam from a spallation neutron source of the Japan Proton Research Complex. The overview of the project and the current progress are presented.

scholarly journals Transfer Reactions As a Tool in Nuclear Astrophysics

2021 ◽  
Vol 8 ◽  
Author(s):  
Faïrouz Hammache ◽  
Nicolas de Séréville
Keyword(s):  
Cross Sections ◽  
Transfer Reaction ◽  
Nuclear Reactions ◽  
Experimental Studies ◽  
Nuclear Astrophysics ◽  
Spectroscopic Properties ◽  
Reaction Rates ◽  
Theoretical Concept ◽  
Reaction Method ◽  
Basic Features

Nuclear reaction rates are one of the most important ingredients in describing how stars evolve. The study of the nuclear reactions involved in different astrophysical sites is thus mandatory to address most questions in nuclear astrophysics. Direct measurements of the cross-sections at stellar energies are very challenging–if at all possible. This is essentially due to the very low cross-sections of the reactions of interest (especially when it involves charged particles), and/or to the radioactive nature of many key nuclei. In order to overcome these difficulties, various indirect methods such as the transfer reaction method at energies above or near the Coulomb barrier are used to measure the spectroscopic properties of the involved compound nucleus that are needed to calculate cross-sections or reaction rates of astrophysical interest. In this review, the basic features of the transfer reaction method and the theoretical concept behind are first discussed, then the method is illustrated with recent performed experimental studies of key reactions in nuclear astrophysics.

scholarly journals Decay of 160Er* in 16O + 144Nd and 64Ni + 96Zr Fusion Reactions

2019 ◽  
Vol 7 ◽  
pp. 137
Author(s):  
N. G. Nicolis ◽  
J. L. Barreto ◽  
D. G. Sarantites ◽  
R. J. Charity ◽  
L. G. Sobotka ◽  
...  
Keyword(s):  
Compound Nucleus ◽  
Cross Sections ◽  
Detection System ◽  
Good Description ◽  
Evaporation Residue ◽  
Fusion Reactions ◽  
Fusion Model ◽  
Fusion Data ◽  
Spin Distributions ◽  
Bombarding Energy

The population of evaporation residue entry states in the decay of the compound nucleus 160Er*(54 MeV) is investigated in a cross-bombardment employing the reactions 160 + 144Nd and 64Ni + 96Zr. Evaporation residue cross sections and entry state 7-ray fold distributions of the dominant exit channels were obtained for each reaction, using a 4π 7-ray detection system. An entrance-channel dependence of the 7-ray fold distributions of the xn products is observed. This effect is described successfully by the statistical model making use of compound nucleus angular momentum distributions obtained with a fusion model that provides a good description of the bombarding energy dependence of fusion data for both reactions. In accordance with recent findings on the decay of 164Yb*, it is suggested that the observed differences in the population of the dominant exit channels originate from the primary spin distributions rather than a possible dependence of the compound nucleus decay on the formation mode.

scholarly journals Detailed low-spin spectroscopy of Ni65 via neutron capture reaction

2020 ◽  
Vol 102 (6) ◽  
Author(s):  
C. Porzio ◽  
C. Michelagnoli ◽  
N. Cieplicka-Oryńczak ◽  
M. Sferrazza ◽  
S. Leoni ◽  
...  
Keyword(s):  
Neutron Capture ◽  
Neutron Capture Reaction ◽  
Capture Reaction

A ALow-Energy Direct Channel Regge-pole Approach to α-C12Elastic Scattering .I

1981 ◽  
Vol 36 (5) ◽  
pp. 443-446 ◽  
Author(s):  
D. Majumdar ◽  
A. Roy Chowdhury ◽  
T. Roy
Keyword(s):  
Elastic Scattering ◽  
Compound Nucleus ◽  
Cross Sections ◽  
Regge Pole ◽  
Direct Channel ◽  
Scattering Cross ◽  
Scattering Cross Sections ◽  
Background Effect

Abstract Differential scattering cross-sections for the elastic scattering of α by C12 at laboratory bombarding energies from 11.0 to 16.0 MeV have been evaluated in the direct channel Regge-pole formalism, taking into account the contributions from a few nearby dominant excited levels of the compound nucleus O16 and incorporating the background effect. The relevant pole-parameters have also been predicted.

Levels of 188Re nucleus populated in thermal neutron capture reaction

2016 ◽  
Vol 947 ◽  
pp. 76-126 ◽  
Author(s):  
J. Bērziņš ◽  
T. Krasta ◽  
L. Simonova ◽  
M. Balodis ◽  
V. Bondarenko ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
Neutron Capture ◽  
Thermal Neutron Capture ◽  
Neutron Capture Reaction ◽  
Capture Reaction
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