Excitation function for α-particle-induced reactions in light-mass nuclei

1993 ◽  
Vol 71 (3-4) ◽  
pp. 115-121 ◽  
Author(s):  
N. L. Singh ◽  
S. Agarwal ◽  
J. Rama Rao
Keyword(s):  
High Resolution ◽  
Inelastic Scattering ◽  
Excitation Function ◽  
Low Energy ◽  
Activation Technique ◽  
Scattering Effects ◽  
Foil Activation ◽  
Stacked Foil Activation Technique ◽  
First Time ◽  
Existing Data

The excitation functions of 51V [(α, xn), x = 1.3; (α, p3n); (α, α3n) (α, 2α)] and 59Co[(α, 2n); (α, αxn); x = 1, 2] reactions were measured up to 50 MeV by the stacked-foil activation technique and high-resolution Ce(Li)–HPGe spectroscopy method. Of these 51V(α, xnypzα) reactions were studied for the first time with better accuracy than earlier measurements, which were done with a poor resolution scintillation–Ge(Li) detectors some 20 years ago. In the case of 59Co, existing data show large discrepancies at low energy. Comparisons are presented with the prediction of hybrid and exciton models. While for the (α, xn) type of reactions, reasonably explainable pre-equilibrium contributions are found, there seem to be indications of direct inelastic scattering effects in the (α, αxn) type of reactions.

ALPHA-INDUCED REACTIONS IN ANTIMONY

1994 ◽  
Vol 03 (01) ◽  
pp. 239-248 ◽  
Author(s):  
M.K. BHARDWAJ ◽  
I.A. RIZVI ◽  
A.K. CHAUBEY
Keyword(s):  
Excitation Function ◽  
Beam Energy ◽  
Gamma Ray ◽  
Computer Code ◽  
Reaction Yield ◽  
Activation Technique ◽  
Model Calculations ◽  
Equilibrium Fraction ◽  
Foil Activation ◽  
Stacked Foil Activation Technique

The excitation function of α-induced reactions on 121Sb and 123Sb has been measured. The α-beam energy ranges from 55.0±0.5 MeV to 21.9±1.2 MeV. In these experiments, the stacked foil activation technique was used. The reaction yield was measured by counting the gamma ray activity produced by the alpha-induced reactions. Results so obtained were compared with the calculations from the geometry-dependent hybrid (GDH) model. The assumption of initial exciton number n0=4 with n=2, p=2 and h=0 best satisfies the results measured in the present work. The model calculations were done using the ALICE/LIVERMORE-82 computer code. The pre-equilibrium fraction has also been calculated.

scholarly journals Excitation function of natCu(3He,x)65Zn nuclear reaction for 3He beam monitoring purpose

2020 ◽  
Vol 239 ◽  
pp. 20009
Author(s):  
Mayeen Uddin Khandaker ◽  
Kotaro Nagatsu ◽  
Honoka Obata ◽  
Katsuyuki Minegishi ◽  
Ming-Rong Zhang ◽  
...  
Keyword(s):  
Excitation Function ◽  
Nuclear Reaction ◽  
Incident Energy ◽  
Activation Technique ◽  
Monitor Reaction ◽  
Foil Activation ◽  
Experimental Works ◽  
Γ Ray ◽  
Stacked Foil Activation Technique ◽  
Beam Monitoring

The excitation function of the natCu(3He,x)65Zn nuclear reaction was measured from its threshold up to 53 MeV incident energy relative to the natTi(3He,x)48V monitor reaction by using the conventional stacked foil activation technique combined with HPGe γ-ray spectrometry. Our result is systematically higher than the IAEA recommendation, and more experimental works are desired especially above 25 MeV.

Preequilibrium emission of multiparticles in α-induced reactions with 55Mn nucleus

1989 ◽  
Vol 67 (11) ◽  
pp. 1091-1096 ◽  
Author(s):  
I. A. Rizvi ◽  
M. K. Bhardwaj ◽  
M. Afzal Ansari ◽  
A. K. Chaubey
Keyword(s):  
Experimental Data ◽  
Hybrid Model ◽  
Spectroscopy Method ◽  
Activation Technique ◽  
Target Element ◽  
Geometry Dependent Hybrid Model ◽  
Foil Activation ◽  
Γ Ray ◽  
Stacked Foil Activation Technique ◽  
First Time

α-induced reactions on the target element Mn were investigated from 7 to 60 MeV, using the stacked-foil activation technique and the Ge(Li) γ-ray spectroscopy method. Six excitation functions for the reaction residues 58Co, 57Co, 56Co, 55Co, 54Mn, and 52gMn were measured, of which 55Mn (α,α3n) 52gMn was measured for the first time. The experimental data were compared with calculations considering equilibrium as well as preequilibrium reactions according to the geometry-dependent hybrid model of Blann (see Phys. Rev. Lett. 27, 337 (1971); 27, 700E (1971); 27, 1550E (1971)). The initial exciton number, n0 = 4, with different configurations was tested. It was found that the configuration (2n + 2p + oh) appears to give a good fit to the experimental data.

Article

1998 ◽  
Vol 76 (10) ◽  
pp. 785-791
Author(s):  
N L Singh ◽  
D J Shah ◽  
H B Patel
Keyword(s):  
Hybrid Model ◽  
Alpha Particle ◽  
Gamma Ray ◽  
Experimental Results ◽  
Particle State ◽  
Activation Technique ◽  
Natural Iron ◽  
Foil Activation ◽  
Stacked Foil Activation Technique

The stacked-foil activation technique and HPGe gamma-ray spectroscopy were used for the investigation of alpha-particle-induced reactions on natural iron up to 50 MeV. Excitation functions for the production of reaction residues 57Ni, 56Ni, 58Co, 57Co, and 56Co from alpha-particle-induced reactions on 56Fe were measured with a view to improve the quality of earlier measurements. The experimental results were compared with calculations considering equilibrium as well as preequilibrium reactions according to hybrid model of Blann (ALICE/90). It was found that the initial exciton configuration n0= 4(2p + 2n + 0h ) i.e., pure particle state appears to give a good fit to the experimental data.PACS No.: 25.60

Study of Delayed States in 94Nb, 108Ag, and 110Ag

1971 ◽  
Vol 49 (6) ◽  
pp. 747-755 ◽  
Author(s):  
S. C. Gujrathi ◽  
J. M. d'Auria ◽  
R. G. Korteling
Keyword(s):  
High Resolution ◽  
Level Scheme ◽  
Half Life ◽  
Gamma Transition ◽  
Low Energy ◽  
X Ray ◽  
Upper Limits ◽  
Energy Gamma ◽  
Gamma Transitions ◽  
First Time

The lifetimes and energies associated with low-energy gamma transitions from the 93Nb(n,γ)94Nb, 107Ag(n,γ)108Ag, and 109Ag(n,γ)110Ag reactions have been studied using a high-resolution Ge(Li) X-ray spectrometer. New weak transitions are observed in the decay of 110Ag at 30.84, 38.19, 41.78, and 136.65 keV, while intense gamma transitions at 105.6, 235.8, and 266.95 keV are resolved into doublets. The half-life of the state involving the intense 117.47 keV transition in 110Ag and the 215 keV transition in 108Ag is confirmed as 36.5 ± 2.0 ns and 54 ± 8 ns, respectively, while a new delayed state associated with the gamma transition of 99.404 keV (T1/2 = 30 ± 5 ns) in 94Nb is observed for the first time. The upper limits for the half-lives involving most of the intense transitions in all the three isotopes are also reported. A level scheme is proposed and discussed for 108Ag.

STUDY OF EXCITATION FUNCTIONS IN Rh(α, xn) Ag REACTIONS

1996 ◽  
Vol 05 (02) ◽  
pp. 345-352 ◽  
Author(s):  
M. AFZAL ANSARI ◽  
N.P.M. SATHIK ◽  
B.P. SINGH ◽  
M.G.V. SANKARACHARYULU ◽  
R. PRASAD
Keyword(s):  
Experimental Data ◽  
Compound Nucleus ◽  
Alpha Particle ◽  
Computer Code ◽  
Particle Energy ◽  
Activation Technique ◽  
Excitation Functions ◽  
Foil Activation ◽  
Alpha Particle Energy ◽  
Stacked Foil Activation Technique

The excitation functions for the reactions 103 Rh (α, n)106 m Ag , 103 Rh (α, 2n)105 Ag , and 103 Rh (α, 3n)104 Ag have been measured between 10 and 40 MeV alpha-particle energy, using the stacked foil activation technique. Excitation functions are also calculated theoretically using the Geometry Dependent Hybrid (GDH) model. The computer code ALICE/LIVERMORE-82 has been used which takes into account the pre-equilibrium contribution along with the equilibrium decay of the compound nucleus. It has been found that initial exciton number n0=4 gives a satisfactory reproduction of experimental data.

scholarly journals Charged particle activation facility in NPI CAS and in future GANIL/SPIRAL2-NFS

2020 ◽  
Vol 239 ◽  
pp. 17010
Author(s):  
Jaromir Mrazek ◽  
Eva Simeckova ◽  
Radomir Behal ◽  
Vadim Glagolev ◽  
František Vesely ◽  
...  
Keyword(s):  
Nuclear Astrophysics ◽  
Activation Technique ◽  
Transfer System ◽  
Isotope Production ◽  
Foil Activation ◽  
Charged Particle Activation ◽  
Particle Activation ◽  
Stacked Foil Activation Technique ◽  
Irradiation Chamber

The proton, deuteron and alpha induced reactions are of a great interest for the assessment of induced radioactivity of accelerator components, targets and beam stoppers as well as isotope production for medicine and also to nuclear astrophysics. We present a new irradiation chamber for activation measurements, that forms a prolongation of long-term experimental activities using stacked-foil activation technique in NPI CAS, Řež. The chamber is based on an airlock system and is coupled to a pneumatic transfer system delivered by KIT Karlsruhe. This system is installed in GANIL/SPIRAL2-NFS and will be used for proton, deuteron and alpha particle activation measurements with long- and short-lived isotopes.

Measurement and analysis of excitation functions for alpha-particle-induced reactions in rhenium

2004 ◽  
Vol 82 (3) ◽  
pp. 227-237
Author(s):  
N L Singh ◽  
M S Gadkari
Keyword(s):  
Cross Sections ◽  
Residual Nucleus ◽  
Reaction Cross ◽  
Activation Technique ◽  
Excitation Functions ◽  
Theoretical Predictions ◽  
Reaction Channels ◽  
Stacked Foil Activation Technique ◽  
The Individual ◽  
First Time

Excitation functions of the reactions 185Re[(α,n); (α,2n); (α,3n)] and 187Re[(α,n); (α,2n); (α,3n); (α,4n)] were investigated up to 50 MeV using the stacked-foil activation technique and high-purity germanium γ-ray spectroscopy method. Since the natural rhenium used as a target has two odd-mass stable isotopes of abundance 37.4% (185Re) and 62.6% (187Re), their activation in some cases gives the same residual nucleus through different reaction channels, but with very different Q values. In such cases, the individual reaction cross sections are separated with the help of the ratio of theoretical cross sections. The experimental cross sections were compared with the theoretical predictions considering equilibrium as well as pre-equilibrium contributions using code ALICE/90. It was found that the initial exciton configuration n0 = 4 (4p0h) appears to give a good fit to the experimental data. To the best of our knowledge, the excitation functions for 185Re[(α,n); (α,2n); (α,3n)] and 187Re[(α,3n); (α,4n)] reactions were measured for the first time. PACS No.: 25.55.–e

scholarly journals Measurement of cross-section for the 139La(n,γ)140la reaction using reflected neutron beam at 0.0334 eV energy

2015 ◽  
Vol 30 (4) ◽  
pp. 267-272 ◽  
Author(s):  
Mohammad Islam ◽  
Syed Hossain ◽  
Farzana Akter ◽  
Mohammad Uddin ◽  
Kamrun Naher ◽  
...  
Keyword(s):  
Excitation Function ◽  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Activation Technique ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
Present Value ◽  
Data Libraries ◽  
First Time

The experimental neutron capture cross-section for the 139La(n, g)140La reaction at 0.0334 eV was measured for the first time using activation technique. The obtained cross-section value amounted to 7.86 ? 0.55 b is in agreement with the evaluated data libraries ENDF/B-VII and JENDL-3.3. The present value measured at 0.0334 eV and the previous data at 0.0536 eV were extrapolated to the energy 0.0253 eV assuming 1/v dependence and the results were compared with the integrally measured values reported in the literature. The new data are thus useful to check the evaluated excitation function.

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