Search results for "Reaction"
showing 10 items of 6134 documents
Production of exotic hypernuclei from excited nuclear systems
2012
We show that within a hybrid two-stage approach one can explain novel experimental data on the production of hypernuclei emitted from projectile residues in relativistic ion collisions. This reaction proceeds via formation of intermediate moderately excited hypernuclear systems, which decay into conventional nuclei and hyperfragments afterward. With a similar reaction mechanism one can also obtain weakly bound exotic hypernuclei (such as $\ensuremath{\Lambda}n$ and H-dibaryons), which may not be easily accessible in other processes.
Invariant mass spectrum and α-n correlation function studied in the fragmentation of 6He on a carbon target
1998
13 pags, 5 figures.-- PACS nrs.: 24.60.−t; 25.70.Ef; 27.20.+n.
Dependence of the C12(γ→,pd) reaction on photon linear polarisation
2007
Abstract The sensitivity of the C 12 ( γ → , pd ) reaction to photon linear polarisation has been determined at MAMI, giving the first measurement of the reaction for a nucleus heavier than 3He. Photon asymmetries and cross sections were measured for E γ = 170 to 350 MeV. For E γ below the Δ resonance, reactions leaving the residual 9Be near its ground state show a positive asymmetry of up to 0.3, similar to that observed for 3He suggesting a similar reaction mechanism for the two nuclei.
New gas-filled mode of the large-acceptance spectrometer VAMOS
2010
A new gas-filled operation mode of the large-acceptance spectrometer VAMOS at GANIL is reported. A beam rejection factor greater than 10(10) is obtained for the Ca-40+Sm-150 system at 196 MeV. The unprecedented transmission efficiency for the evaporation residues produced in this reaction is estimated to be around 80% for alpha x n channels and above 95% for x ny p channels. A detailed study of the performance of the gas-filled VAMOS and future developments are discussed. This new operation mode opens avenues to explore the potential of fusion reactions in various kinematics. (C) 2010 Elsevier B.V. All rights reserved.
The large-area micro-channel plate entrance detector of the heavy-ion magnetic spectrometer PRISMA
2005
This paper describes the entrance detector of the magnetic spectrometer PRISMA recently installed at Legnaro. The detector is based on rectangular (80 x 100 mm(2)) Micro-Channel Plates (MCP). It provides a fast time signal and its position-sensitive anode allows to extract the X and Y information. It exploits an electrostatic field for the acceleration of secondary electrons from a thin Carbon foil (similar or equal to 20 mu g/cm(2)) onto the MCP assembly. The electrons are guided by a parallel magnetic field. Good performances were obtained in the laboratory tests. The detector is presently installed at the entrance of PRISMA and gives resolutions <= 400 ps in time, and 1 mm in both X and …
Single particle structure of exotic nuclei with transfer reactions
2006
International audience; We report here on the first results obtained from the study of the 24Ne(d, p)25Ne reaction performed with SPIRAL beam at GANIL using the new TIARA+V AMOS+EXOGAM setup.
8He-6He: a comparative study of nuclear fragmentation reactions
2001
19 pages, 3 tables, 6 figures.-- PACS nrs.: 27.20.+n; 24.70.+s; 25.06.-t.-- Available online Dec 4, 2000.
The triple-alpha-reaction at low temperatures.
1986
We have studied the triple-α-reaction at low temperatures which is of importance on accreting white dwarfs and neutron stars. Although we have improved a recent investigation of Nomoto, Thielemann and Miyaji on several points, we find a reaction rate for the relevant temperature range (T=107−108K) which is rather similar to the previous result. In particular, our improved study confirms that helium might be ignited on accreting white dwarfs at temperaturesT≦4.107 K.
Formation of slow molecules in chemical reactions in crossed molecular beams
2008
T. V. Tscherbul, Ğ Barinovs, J. Klos, and R. V. Krems Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 Department of Theoretical Physics, Institute of Chemical Physics, University of Latvia, Riga, Latvia Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA Received 13 January 2008; revised manuscript received 29 May 2008; published 8 August 2008
Resonant Nuclear Fusion Processes and the Gamma Rays of SS 433
1984
Gamma-ray spectral lines have recently been reported coming from the celestial object SS 433, which is known to emit high-speed jets in opposite directions. The proposed identification of the lines as coming from fusion reactions on nitrogen nuclei as part of the carbon-nitrogen-oxygen cycle operating in the jets has now received observational support. Predictions of strengths and widths of additional lines which, if seen, would provide valuable new information about conditions giving rise to the jets are presented.