NUCLEAR REACTIONS INDUCED IN TANTALUM BY PROTONS OF ENERGY UP TO 84 MEV

1963 ◽  
Vol 41 (10) ◽  
pp. 2516-2532 ◽  
Author(s):  
C. L. Rao ◽  
L. Yaffe
Keyword(s):  
Cross Sections ◽  
Half Life ◽  
Reasonable Agreement ◽  
Nuclear Reactions ◽  
Schematic Model ◽  
Radiation Characteristics ◽  
Excitation Functions ◽  
Γ Rays ◽  
The Cross

Nuclear reactions induced in tantalum by protons of energy up to 84 Mev have been studied and excitation functions obtained for products formed by (p,xn), (p,pxn), (p,2pxn), and (p,3pxn) reactions. Radiation characteristics of the products were redetermined. Previously unreported γ-rays with energies 90 to 1050 kev have been found for W176, and 113 kev for W177. A new half-life of 2.7 ± 0.1 hr for W176 is reported. The cross sections for the (p,xn) reactions were compared with the values predicted by Jackson's schematic model and found to be in reasonable agreement. More complex reactions are discussed in the light of current nuclear theories.

The cross sections for different channels in heavy ion nuclear reactions

1971 ◽  
Vol 32 (1) ◽  
pp. 7-9 ◽  
Author(s):  
J. Galin ◽  
D. Guerreau ◽  
M. Lefort ◽  
X. Tarrago
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Heavy Ion ◽  
The Cross

Reaction cross section calculations via second beta decay using the activation method for the p-process

2019 ◽  
Vol 97 (11) ◽  
pp. 1206-1209
Author(s):  
Ezgi Tantoğlu ◽  
Nalan Özkan ◽  
R. Taygun Güray
Keyword(s):  
Beta Decay ◽  
Cross Section ◽  
Cross Sections ◽  
Half Life ◽  
Reaction Cross Section ◽  
Experimental Studies ◽  
Reaction Cross ◽  
Activation Method ◽  
Alternative Method ◽  
The Cross

There are 35 proton-rich isotopes between 74Se and 196Hg that cannot be synthesized through neutron captures and β− decays (s- and r-processes). A third process is therefore required for the production of these nuclei, the so-called p-process. The abundance and the origin of the p-nuclei are still not fully understood even though significant experimental and theoretical efforts in astrophysical modeling have been expended in the last two decades. The experimental studies with the activation method to measure cross sections of the relevant reactions have some limitations: the reaction product must be radioactive, should have an appropriate half-life, and its decay should be followed by proper γ-radiations. If the cross section cannot be calculated with the radiation followed by the first beta decay of the product, it can be measured using the second beta decay as an alternative method. In this study, the method and candidate reactions for the cross-section measurements via the second beta decay of the reaction product using the activation method are discussed.

INCLUSIVE ELECTRON NEUTRINO REACTIONS IN NUCLEI AND THE NEUTRON NUMBER

2001 ◽  
Vol 10 (04n05) ◽  
pp. 387-392 ◽  
Author(s):  
S. L. MINTZ
Keyword(s):  
Cross Sections ◽  
Reasonable Agreement ◽  
Neutron Number ◽  
Electron Neutrino ◽  
The Cross ◽  
Inclusive Electron

We compare the inclusive electron neutrino cross sections, νe+Ni→X + e-, averaged over the Michel spectrum for 12 C , 13 C , 56 Fe and 127 I . We choose these nuclei because terrestrial measurements at LSND and KARMEN have been undertaken for them and these measurements are in reasonable agreement with calculated values. We show that the cross sections increase linearly with neutron number for these nuclei and discuss what this might imply.

PECULIARITIES OF NUCLEAR REACTIONS INDUCED BY 6He AND 6Li NUCLEI NEAR THE COULOMB BARRIER

2008 ◽  
Vol 17 (10) ◽  
pp. 2349-2353 ◽  
Author(s):  
YU. E. PENIONZHKEVICH ◽  
R. KALPAKCHIEVA ◽  
A. A. KULKO ◽  
S. M. LUKYANOV ◽  
V. A. MASLOV ◽  
...  
Keyword(s):  
Statistical Model ◽  
Cross Section ◽  
Coulomb Barrier ◽  
Nuclear Reactions ◽  
Transfer Reactions ◽  
Excitation Functions ◽  
Model Calculations ◽  
The Cross ◽  
Evaporation Residues

Excitation functions for evaporation residues in the reactions 206,208 Pb (6,4 He,2n 210 Po , as well as for the transfer reactions in the interaction of 6 He and 6 Li projectiles with Au and Pt were measured at the energies near the Coulomb barrier. Studied reactions were characterized by an increase in the cross-section compared to statistical model calculations.

A new empirical formula for cross-sections of (n,nα) reactions

2020 ◽  
Vol 29 (08) ◽  
pp. 2050062
Author(s):  
Mustafa Yiğit
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Empirical Formula ◽  
Nuclear Reactions ◽  
Measured Cross Section ◽  
Future Studies ◽  
Present Formalism ◽  
The Cross ◽  
Neutron Cross Sections ◽  
Good Agreement

Studies on the cross-sections of (n,n[Formula: see text]) reactions which are energetically possible, about 14 MeV neutrons are quite scarce. In this paper, the cross-sections of (n,n[Formula: see text] nuclear reactions at [Formula: see text]14–15 MeV are analyzed by using a new empirical formula based on the statistical theory. We show that neutron cross-sections are closely related to the [Formula: see text]-value of nuclear reaction, in particular for (n,n[Formula: see text]) channels. Results obtained with this empirical formula show good agreement with the available measured cross-section values. We hope that the estimations on the cross-sections using the present formalism may be helpful in future studies in this field.

scholarly journals Excitation functions of proton induced nuclear reactions on natFe up to 16 MeV, with emphasis on radiochemical determination of low cross sections

2017 ◽  
Vol 105 (12) ◽  
Author(s):  
Md. Shuza Uddin ◽  
Animesh Kumer Chakraborty ◽  
Stefan Spellerberg ◽  
Ingo Spahn ◽  
Md. Asad Shariff ◽  
...  
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Excitation Functions ◽  
Radiochemical Determination

AbstractExcitation functions for the formation of the radionuclides

STUDY OF ISOMERIC CROSS-SECTION RATIO AND PRE-EQUILIBRIUM FRACTION IN PROTON AND ALPHA PARTICLE INDUCED NUCLEAR REACTIONS ON 197Au

2012 ◽  
Vol 21 (06) ◽  
pp. 1250059 ◽  
Author(s):  
B. SATHEESH ◽  
M. M. MUSTHAFA ◽  
B. P. SINGH ◽  
R. PRASAD
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Energy Difference ◽  
Activation Technique ◽  
Cross Section Ratio ◽  
Excitation Functions ◽  
Section Ratio ◽  
Isomeric Cross Section Ratio ◽  
Equilibrium Emission

Excitation functions for the reactions 197 Au(p,n) 197g Hg and 197 Au(p,n) 197m Hg have been measured over the energy ranges from threshold up to 20 MeV using stacked foil activation technique. The isomeric cross-section ratio σm/(σm+σg) for the formation of 197g, m Hg was determined. The excitation functions and isomeric cross-section ratios were calculated for the reactions 197 Au(p,n) 197g,m Hg , 197 Au(p,2n) 196 Hg , 197 Au(p,3n) 195g,m Hg , 197 Au(p,4n) 194 Hg , 197 Au(p,5n) 193g,m Hg , 197 Au (α, n )200 Tl , 197 Au (α, 2n )199 Tl , 197 Au (α, 3n )198g,m Tl , 197 Au (α, 4n )197 Tl and 197 Au (α, 5n )196g,m Tl from reaction threshold up to 40 MeV for proton induced reactions and 80 MeV for alpha induced reactions. The results were compared with the theoretical cross-sections calculated by means of the code EMPIRE-II and with the available literature data, which makes use of the Hauser Feshbach model for the compound nuclear calculations and the exciton model for the pre-equilibrium emission part. The isomeric cross-section ratio is found to depend strongly on the relative spins of the isomeric and ground state, energy difference between the levels, presence of intermediate states and some dependence on decay modes and on the onset of pre-equilibrium emission.

scholarly journals Investigation of cross sections of deuteron induced nuclear reactions on selenium up to 50 MeV

2021 ◽  
Vol 57 (4) ◽  
Author(s):  
Ferenc Tárkányi ◽  
Sándor Takács ◽  
Ferenc Ditrói ◽  
Zoltán Szűcs ◽  
Károly Brezovcsik ◽  
...  
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Gamma Ray ◽  
Nuclear Reactions ◽  
Particle Energy ◽  
Gamma Ray Spectrometry ◽  
Excitation Functions ◽  
On Line ◽  
Theoretical Model Codes ◽  
Activation Cross Sections

AbstractIn the frame of a systematic study of deuteron induced nuclear reactions on all elements, activation cross sections on $$^{\mathrm {nat}}$$ nat Se were investigated. Excitation functions were measured up to 50 MeV particle energy for production of $$^{\mathrm {82}}$$ 82 Br(m$$+)$$ + ) ,$$^{\mathrm {80m}}$$ 80 m Br, $$^{\mathrm {77}}$$ 77 Br(m$$+)$$ + ) ,$$^{\mathrm {76}}$$ 76 Br(m$$+)$$ + ) , $$^{\mathrm {75}}$$ 75 Br, $$^{\mathrm {75}}$$ 75 Se(cum), $$^{\mathrm {73}}$$ 73 Se(cum), $$^{\mathrm {76}}$$ 76 As,$$^{\mathrm {74}}$$ 74 As, $$^{\mathrm {73}}$$ 73 As(cum), $$^{\mathrm {72}}$$ 72 As and $$^{\mathrm {71}}$$ 71 As(cum) by using the activation method through stacked foil irradiation followed by off-line gamma-ray spectrometry. The experimental results were compared to the earlier experimental data and to excitation functions calculated with the ALICE-D and EMPIRE-D theoretical model codes and data given in the TENDL-2019 on-line library based on TALYS calculations.

The cross sections of the proton nuclear reactions on Cd isotopes

2015 ◽  
Vol 170 (11) ◽  
pp. 901-905
Author(s):  
Jong-Do An ◽  
Chol-Jin Kim ◽  
Hak-Son Jin ◽  
Myong-Son Go
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Cd Isotopes ◽  
The Cross
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