Results on the cross-section of238U-fission induced by low-energy monoenergetic γ-rays

1966 ◽  
Vol 44 (1) ◽  
pp. 218-221 ◽  
Author(s):  
A. Manfredini ◽  
M. Muchnik ◽  
L. Fiore ◽  
C. Ramorino ◽  
H. G. De Carvalho ◽  
...  
Keyword(s):  
Cross Section ◽  
Low Energy ◽  
Γ Rays ◽  
The Cross

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.

Vibrational relaxation induced by very low energy collisions in the S1(1B2u) state of naphthalene: a search for resonance enhancement of the cross section

1988 ◽  
Vol 92 (13) ◽  
pp. 3751-3760 ◽  
Author(s):  
Desmond J. Muller ◽  
Ruth I. McKay ◽  
Geoffrey B. Edwards ◽  
Warren D. Lawrance ◽  
Judith P. Hardy ◽  
...  
Keyword(s):  
Cross Section ◽  
Vibrational Relaxation ◽  
Low Energy ◽  
Resonance Enhancement ◽  
The Cross

Formation of dtμ in muon-catalysed fusion: a resonant rearrangement process

1996 ◽  
Vol 74 (7-8) ◽  
pp. 401-406 ◽  
Author(s):  
E. A. G. Armour
Keyword(s):  
Cross Section ◽  
Formation Rate ◽  
Low Energy ◽  
Energy Collision ◽  
Scattering Process ◽  
New Approach ◽  
Coupled Equations ◽  
Rearrangement Process ◽  
The Cross

A key process in the muon-catalysed fusion cycle is a low-energy collision of a tμ atom with a DA molecule, where A is H, D, or T, which leads at appropriate incident energies, to the formation of a resonant complex containing dtμ. In this paper, methods of calculating the resonant formation rate of dtμ are discussed. A description is given of a new approach that makes use of coupled equations for the rearrangement scattering process and elements of Feshbach's theory of resonances to obtain an expression for the cross section for resonant dtμ formation. The insights gained from this approach are discussed.

The coherent scattering of γ -rays by K electrons in heavy atoms - II. The scattering of 0·32 mc 2 γ -rays in mercury

1954 ◽  
Vol 227 (1168) ◽  
pp. 59-72 ◽  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorptive Part ◽  
Coherent Scattering ◽  
Heavy Atoms ◽  
University Of Cambridge ◽  
Γ Rays ◽  
The Cross ◽  
The University ◽  
Scattering Cross Sections

The results of calculations for the coherent scattering of γ -rays of energy 0·32 mc 2 by K electrons in mercury are given in a form which enables one to determine scattering cross-sections at any angle, for any initial and final polarizations and for any spin orientation of the electrons. The method used in doing the computation is that described in part І, the main part of the work having been performed on the EDSAC computer at the University of Cambridge. The dispersive contribution to the cross-section agrees with previous approximate calculations. The absorptive part is calculated as well and has the effect of adding to the cross-section a contribution approximately equal to one-sixth of the dispersive contribution at all angles of scattering.

ISOMER SPECTROSCOPY AT RI BEAM LINE IN RCNP

2010 ◽  
Vol 25 (21n23) ◽  
pp. 1951-1954 ◽  
Author(s):  
A. ODAHARA ◽  
A. TAKASHIMA ◽  
M. SUGA ◽  
K. TAJIRI ◽  
K. KURATA ◽  
...  
Keyword(s):  
Cross Section ◽  
High Spin ◽  
Event Detection ◽  
Fusion Reaction ◽  
Beam Line ◽  
Low Energy ◽  
Spin States ◽  
High Spin States ◽  
Γ Rays ◽  
Ri Beam

Experiments based on the isomer-spectroscopy method were performed using the secondary beam line at RCNP, Osaka University. Recently, a new γ-ray spectroscopy method was established using fusion reaction induced by low-energy RI beam. This method enables us to study high-spin states of nuclei in wider mass region where it is difficult to populate them by using the combination of stable beams and stable targets. This method works well although low production of nuclei, because (1) the combination of beams and targets can be selected with large-reaction cross section and (2) high-S/N measurement can be performed by the event-by-event detection to select the events correlated with RI beam, which reduces background γ rays, competing with γ rays emitted from fusion products. As the first step, high-spin states of 142 Pr were studied using fusion reaction induced by low-energy 17 N RI beam. Large cross section was obtained by the 130 Te (17 N ,5 n ) reaction with 4.9 MeV/u 17 N beam. Event selection, which was carried out by the event-by-event detection with low-beam intensity of 2×104 pps, enables high-S/N measurement.

THE ν - N CHARGED CURRENT CROSS-SECTION AT LOW ENERGY

2001 ◽  
Vol 16 (36) ◽  
pp. 2335-2343
Author(s):  
KLARA GOIZ HERNÁNDEZ ◽  
J. J. GODINA NAVA
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Cross Section ◽  
Form Factors ◽  
Low Energy ◽  
Charged Current ◽  
Deep Underground ◽  
The Cross

We reanalyze the neutrino–nucleon charged current (CC) cross-section with particular attention to the energy range Eν ≤ 10 GeV . We use new experimental data to obtain the form factors involved in the calculation of the cross-section, and discuss possible consequences for the interpretation of the measurements of the atmospheric fluxes obtained by deep underground detectors.

Cross section of direct three-body breakup of 9Be for 1576-keV gamma rays

1983 ◽  
Vol 61 (11) ◽  
pp. 1579-1581 ◽  
Author(s):  
M. Fujishiro ◽  
K. Okamoto ◽  
T. Tsujimoto
Keyword(s):  
Cross Section ◽  
Gamma Rays ◽  
Cluster Model ◽  
Theoretical Estimate ◽  
Γ Rays ◽  
The Cross ◽  
Three Body

Using 1576-keV γ-rays from 142Pr, the cross section of the direct three-body breakup of 9Be was measured and found to be (4.0 ± 1.8) × 10−1 μb. This result is in approximate agreement with Salyers' theoretical estimate based upon a cluster model of 9Be.

Sign in / Sign up

Export Citation Format

Share Document