Experimental Limit onϕ-Meson Photoproduction from Hydrogen at 15 GeV

1968 ◽  
Vol 20 (16) ◽  
pp. 877-878 ◽  
Author(s):  
A. Boyarski ◽  
F. Bulos ◽  
W. Busza ◽  
R. Diebold ◽  
S. Ecklund ◽  
...  
Keyword(s):  
Experimental Limit ◽  
Meson Photoproduction

Experimental limit on a 17 keV neutrino branch in the beta decay of 177Lu

1992 ◽  
Vol 28 (1) ◽  
pp. 176-178
Author(s):  
S. Schönert ◽  
K. Schreckenbach ◽  
S. Neumaier ◽  
F.v. Feilitzsch
Keyword(s):  
Beta Decay ◽  
Experimental Limit

An experimental limit on production of axions in a fission reactor

1981 ◽  
Vol 101 (5) ◽  
pp. 341-343 ◽  
Author(s):  
J.-L. Vuilleumier ◽  
F. Boehm ◽  
A.A. Hahn ◽  
H. Kwon ◽  
F.v. Feilitzsch ◽  
...  
Keyword(s):  
Experimental Limit ◽  
Fission Reactor

scholarly journals Theoretical Study on the Formation of 1-neutron and 2-neutron Halo Nuclei via Decay of Elements in Super-Heavy Region

2020 ◽  
Vol 8 (1) ◽  
pp. 11-24
Author(s):  
R.K. Biju ◽  
K. Prathapan ◽  
K.P. Anjali
Keyword(s):  
Half Life ◽  
Neutron Number ◽  
Halo Nuclei ◽  
Neutron Halo ◽  
Experimental Limit ◽  
Proximity Potential ◽  
Deformed Nuclei ◽  
Halo Structure ◽  
Frame Work ◽  
Neutron Shell Closure

The possibility for the existence of 1-neutron and 2-neutron halo nuclei through the decay of even-even nuclei 270-316116, 272-318118 and 278-320120 in the super-heavy region is studied within the frame work of the Coulomb and Proximity Potential Model (CPPM). Halo structure in neutron rich nuclei with Z<=20  is identified by calculating the neutron separation energies and on the basis of potential energy considerations. The 1n + core configuration of proposed 1-neutron halo nuclei between z=10  and Z=20 is found shifted to 2n + core configuration in higher angular momentum states. The calculation of half-life of decay is performed by considering the proposed halo nuclei as spherical cluster and as deformed nuclei with a rms radius. Except for 15C, the half-life of decay is found decreased when the rms radius is considered. Only the 1-neutron halo nuclei 26F and 55Ca showed half-lives of decay which are less than the experimental limit. None of the proposed 2-neutron halo nuclei have shown a half-life of decay lower than the experimental limit. Also, the probability for the emission of neutron halo nuclei is found to be less in super-heavy region when compared with the clusters of same isotope family. Further, neutron shell closure at neutron numbers 150, 164 and 184 is identified form the plot of  log10 T1/2 verses the neutron number of parents. The plots of Q-1/2 verses log10 T1/2 and -ln P verses log10 T1/2 for various halo nuclei emitted from the super-heavy elements are found to be linear showing that Geiger-Nuttall law is applicable to the emission of neutron halo also.

scholarly journals K0SΣ0 photoproduction at the BGO-OD experiment

2020 ◽  
Vol 241 ◽  
pp. 01009
Author(s):  
Katrin Kohl ◽  
Stefan Alef ◽  
Patrick Bauer ◽  
Reinhard Beck ◽  
Alessandro Braghieri ◽  
...  
Keyword(s):  
Vector Meson ◽  
Momentum Transfer ◽  
Cross Section ◽  
Photon Beam ◽  
Bremsstrahlung Photon ◽  
Meson Photoproduction ◽  
Accelerator Facility ◽  
Transfer Processes

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon via meson photoproduction. The setup with a BGO calorimeter surrounding the target and an open dipole spectrometer covering the for ward region is ideally suited for investigating low momentum transfer processes, in particular in strangeness photoproduction. The associated photoproduction of K0S and hyperons is essential to understand the role of K* exchange mech anisms. A cusp-like structure observed in the yp → K0SΣ+ reaction at the K* threshold is described by models including dynamically generated resonances from vector meson-baryon interactions. Such interactions are pre dicted to give a peak like structure in K0SΣ0 photoproduction off the neutron. A very preliminary cross section is determined and compared to the prediction, the results appear to support the model

scholarly journals Non-strange dibaryons studied in coherent double neutral-meson photoproduction on the deuteron

2020 ◽  
Vol 241 ◽  
pp. 01007
Author(s):  
Takatsugu Ishikawa ◽  
Hisako Fujimura ◽  
Hiroshi Fukasawa ◽  
Ryo Hashimoto ◽  
Qinghua He ◽  
...  
Keyword(s):  
Invariant Mass Distribution ◽  
Center Of Mass ◽  
Resonance State ◽  
Angular Distributions ◽  
Neutral Meson ◽  
Mass Energy ◽  
Meson Photoproduction ◽  
Neutral Pions ◽  
Center Of Mass Energy ◽  
Interesting Object

The B = 2 bound/resonance state (dibaryon) is an interesting object, which can be a molecule consisting of two baryons or a spatially compact hexaquark hadron object. The yd ^ n°n°d reaction has been experimentally investigated at incident energies ranging from 0.58 to 1.15 GeV to study non-strange dibaryons. The angular distributions of deuteron emission in the yd center-of-mass energy cannot be reproduced by quasi-free production of two neutral pions followed by deuteron coalescence. Additionally a 2.14-GeV peak is observed in the n°d invariant mass distribution. These suggest a sequential process such as yd ^ RIS ^ n°RIV ^ n°n°d with an isoscalar dibaryon RIS and an isovector dibaryon RIV. Since the mass of the observed isoscalar dibaryons are close to the sum of the nucleon (N) and nucleon resonance (N*) masses, an S-wave NN* molecule may play a role as a doorway to a dibaryon.

scholarly journals Color dipole predictions for the exclusive vector meson photoproduction in pp , pPb , and PbPb collisions at run 2 LHC energies

2017 ◽  
Vol 96 (9) ◽  
Author(s):  
V. P. Gonçalves ◽  
M. V. T. Machado ◽  
B. D. Moreira ◽  
F. S. Navarra ◽  
G. Sampaio dos Santos
Keyword(s):  
Vector Meson ◽  
Meson Photoproduction ◽  
Color Dipole
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