(γ, p + α) REACTIONS PRODUCED IN PHOTOGRAPHIC EMULSIONS

1956 ◽  
Vol 34 (2) ◽  
pp. 216-222 ◽  
Author(s):  
D. L. Livesey
Keyword(s):  
Cross Section ◽  
Nuclear Emulsion ◽  
Maximum Energy ◽  
Energy Relation ◽  
Lithium Ions ◽  
Sharp Drop ◽  
Electron Synchrotron ◽  
Most Probable Mode ◽  
Integrated Cross Section ◽  
Photographic Emulsions

Ilford C.2 plates were exposed to bremsstrahlung of maximum energy 70 Mev. from the electron synchrotron at Queen's University, and 82 stars produced in the emulsion have been attributed to the reaction:[Formula: see text]The excitation function of the reaction shows a sharp drop near 40 Mev. and the integrated cross-section up to this limit has been estimated. In addition 23 stars have been identified as being due to the reaction:[Formula: see text]In both reactions the most probable mode of disintegration is by the initial emission of an alpha-particle. The range measurements in the carbon stars have been used to derive an accurate range–energy relation for lithium ions in nuclear emulsion.

Experiments on the reaction T( d , n ) 4 He I. The 90° cross-section

1951 ◽  
Vol 204 (1079) ◽  
pp. 488-499 ◽  
Keyword(s):  
Cross Section ◽  
Heavy Water ◽  
Incident Beam ◽  
Absolute Magnitude ◽  
Alpha Particles ◽  
Low Energy ◽  
Energy Relation ◽  
Conventional Theory ◽  
Simultaneous Observation ◽  
The Cross

The 90° cross-section of the reaction 3 1 H( d , n ) 4 2 He has been investigated over the energy range 100 to 200 keV (energy of bombarding triton) using the 200 keV accelerating set of the establishment. Two methods have been used. As a preliminary experiment the yield of alpha-particles from a thick heavy-ice target was measured per unit charge of incident beam, as a function of deuteron energy, and the variation of cross-section deduced from the gradient of this excitation curve and the range energy relation for tritons in heavy water. Secondly, a comparison was made between the yield of alpha-particles from the D-T reaction and the yield of protons from the D-D reaction when a beam containing both deuterons and tritons was passed through a heavy-water vapour target. (The energy loss in this target was calculated as only a few hundred electron volts.) To do this a simultaneous observation was made of the protons and alpha-particles using the same counter. The values obtained for the cross-section have been compared with the resonance formulae given by Bretscher & French (1949) and by Tascbek, Everhart, Gittings, Hemmendinger & Jarvis (1948) and have been found to be in disagreement with formulae of this type. From considerations of the absolute magnitude of the cross-section it has been deduced that no conventional theory postulating reaction at a distance equal to the sum of the nuclear radii (cf. Konopinski & Teller 1948) will be able to explain this reaction. The evidence for a low-energy resonance (Allan & Poole 1949) is thought to be inconclusive.

scholarly journals The Photoneutron Cross Section of 9Be in the Intermediate Energy Range

1959 ◽  
Vol 12 (1) ◽  
pp. 21 ◽  
Author(s):  
HH Thies ◽  
BM Spicer ◽  
JEE Baglln
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Level Scheme ◽  
Complex Shape ◽  
Intermediate Energy ◽  
Bremsstrahlung Radiation ◽  
Integrated Cross Section ◽  
The Cross

The photoneutron cross section of DBe has been measured in the region from 6�5 to 18 MeV, using filtered bremsstrahlung radiation from an 18 MeV synchrotron. The integrated cross section is in agreement with an earlier experiment, but increased resolution has shown a more complex shape, with sharp maxima at 1l�25�O�2 and 13� 25 � 0�2 MeV. The significant features of the cross section are discussed and compared with the level scheme as it is known at present.

Integrated Cross Section for a Velocity-Dependent Potential

1961 ◽  
Vol 123 (6) ◽  
pp. 2177-2179 ◽  
Author(s):  
O. Rojo ◽  
J. S. Levinger
Keyword(s):  
Cross Section ◽  
Dependent Potential ◽  
Integrated Cross Section

INCLUSIVE TRITIUM STRIPPING REACTION THEORY

1996 ◽  
Vol 05 (01) ◽  
pp. 107-119 ◽  
Author(s):  
A.I. AKHIEZER ◽  
A.P. SOZNIK ◽  
YU. A. BEREZHNOY
Keyword(s):  
Cross Section ◽  
Transfer Reaction ◽  
Energy Distributions ◽  
Nucleon Transfer ◽  
Intermediate Energies ◽  
Reaction Theory ◽  
Integrated Cross Section

The angular and energy distributions and the integrated cross-section of the inclusive two-nucleon transfer reaction with the participation of three-nucleon nucleus were calculated at intermediate energies.

PHOTONEUTRON THRESHOLD AND CROSS SECTION FOR 71Lu175

1958 ◽  
Vol 36 (4) ◽  
pp. 415-418 ◽  
Author(s):  
H. J. King ◽  
L. Katz
Keyword(s):  
Cross Section ◽  
Neutron Yield ◽  
Giant Resonance ◽  
Threshold Energy ◽  
Half Width ◽  
Bremsstrahlung Energy ◽  
Resonance Cross Section ◽  
Integrated Cross Section ◽  
Peak Value

The neutron yield resulting from photoneutron reactions in Lu175 has been measured as a function of peak bremsstrahlung energy up to 23 Mev. The threshold energy for this reaction was found to be 7.77 ± 0.05 Mev. The giant resonance cross section has a peak value of 225 millibarns at 16 Mev., a half-width of 8.4 Mev., and an integrated cross section to 23 Mev. of 1.9 Mev-barns.

Fluctuations in the integrated cross section of the reaction 45Sc(p, n)45Ti

1967 ◽  
Vol 96 (3) ◽  
pp. 521-528 ◽  
Author(s):  
K.V.K. Iyengar ◽  
S.K. Gupta ◽  
K.K. Sekharan ◽  
M.K. Mehta ◽  
A.S. Divatia
Keyword(s):  
Cross Section ◽  
Integrated Cross Section

Differential and Angle-Integrated Cross-Section Measurement for the6Li(n,t)4He Reaction atEn= 1.05, 1.54, and 2.25 MeV

2006 ◽  
Vol 153 (1) ◽  
pp. 41-45 ◽  
Author(s):  
Guohui Zhang ◽  
Rongtai Cao ◽  
Jinxiang Chen ◽  
Guoyou Tang ◽  
Yu. M. Gledenov ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Section Measurement ◽  
Section Measurement ◽  
Integrated Cross Section

Photoneutron Cross Sections in 14N

1972 ◽  
Vol 50 (15) ◽  
pp. 1689-1696 ◽  
Author(s):  
R. W. Gellie ◽  
K. H. Lokan ◽  
N. K. Sherman ◽  
R. G. Johnson ◽  
J. I. Lodge
Keyword(s):  
Excited States ◽  
Cross Section ◽  
Cross Sections ◽  
Neutron Emission ◽  
Giant Resonance ◽  
Sequential Decay ◽  
Dipole Resonance ◽  
Intermediate States ◽  
Integrated Cross Section ◽  
High Degree

Photoneutron distributions from 14N have been obtained by time-of-flight methods, for bremsstrahlung end-point energies increasing in 2 MeV steps from 15.5 to 29.5 MeV. A large part of the neutron yield is associated with the sequential decay of 14N to 12C, through well-defined intermediate states of 13C, at 7.55, 8.86, and 11.80 MeV, which are unstable against neutron emission. The (γ,n0) cross section for neutron emission to the ground state of 13N is found to agree very closely with the corresponding (γ,p0) cross section, implying a high degree of isospin purity for the giant dipole resonance of 14N. It is observed that the decay of the giant resonance proceeds freely through those odd-parity excited states of the A = 13 nuclei which are single hole states formed by the removal of a p-shell nucleon from the parent 14N.The integrated cross section for all neutron-producing interactions is found to be 88 ± 5 MeV mb.

The disintegration of nitrogen by slow neutrons

1936 ◽  
Vol 32 (4) ◽  
pp. 632-636 ◽  
Author(s):  
W. E. Burcham ◽  
M. Goldhaber
Keyword(s):  
Cross Section ◽  
Image Position ◽  
Photographic Emulsions ◽  
Α Particles ◽  
Slow Neutrons

The disintegration of nitrogen by slow neutrons has been studied in photographic emulsions of different sensitivity, which enable an unambiguous distinction to be made between the emission of α-particles and protons. Evidence has been obtained that the disintegration takes place according to the reactionwith a cross-section of about 10−24 cm.2

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