PRELIMINARY RESULTS ON η′ PHOTOPRODUCTION AT GRAAL

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1177-1182
Author(s):  
M. MANGANARO ◽  
V. BELLINI ◽  
J. P. BOCQUET ◽  
L. CASANO ◽  
A. D'ANGELO ◽  
...  
Keyword(s):  
Energy Range ◽  
Beam Asymmetry ◽  
Preliminary Results ◽  
Tagged Photons

The γp → η′p reaction was studied near the threshold, in the 1.44 GeV > Eγ < 1.55 GeV energy range with the tagged photons of the former GRAAL experiment. The two neutral decays γγ(Γi/Γ = 2.10 ± 0.12%) and π0π0η(Γi/Γ = 20.7 ± 1.2%) were analized and preliminary results of the beam asymmetry were extracted together with the invariant masses.

scholarly journals CROSS SECTION ASYMMETRY OF THE 12C(γ,p0)11B AND 12C(γ,p1)11B REACTIONS AT PHOTON ENERGIES 40...55MeV

2019 ◽  
pp. 26-37
Author(s):  
D.D. Burdeinyi ◽  
J. Brudvik ◽  
V.B. Ganenko ◽  
K. Hansen ◽  
K. Fissum ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Energy Range ◽  
Cross Section ◽  
Relative Contribution ◽  
Linearly Polarized ◽  
The Asymmetry ◽  
The Cross ◽  
Tagged Photons

The asymmetry of the cross section of the 12C(γ,p0)11B and 12C(γ,p1)11B reactions has been measured in the energy range 40...55MeV using linearly polarized tagged photons of the MAX-lab facility. The asymmetry of the process 12C(⃗γ,p0)11B is Σ ≈ 0.85, that implies one-particle reaction mechanism. The asymmetry of the reaction 12C(⃗γ,p1)11B is smaller, Σ ≈ 0.6...0.7, that may be due to the stronger relative contribution of the 2h−1p mechanism to the dominant one-particle reaction mechanism.

scholarly journals Current status of luminosity measurement with the CMD-3 detector at the VEPP-2000 collider

2019 ◽  
Vol 212 ◽  
pp. 04011 ◽  
Author(s):  
A.E. Ryzhenenkov ◽  
R.R. Akhmetshin ◽  
A.N. Amirkhanov ◽  
A.V. Anisenkov ◽  
V.M. Aulchenko ◽  
...  
Keyword(s):  
Energy Range ◽  
Current Status ◽  
Final State ◽  
Preliminary Results ◽  
Electron Positron ◽  
Integrated Luminosity

The CMD-3 detector started data taking at the electron-positron collider VEPP-2000 [1] in December 2010. The collected data sample corresponds to an integrated luminosity of 87 pb−1 in the c.m. energy range from 1.06 up to 2 GeV and 91 pb−1 from 0.32 to 1.06 GeV. The integrated luminosity was measured by counting e+e−→ e+e− and e+e−→ γγ events, allowing additional photons in the final state. Preliminary results of the luminosity measurement are presented for various energy ranges and its accuracy is estimated to be 1%.

A measurement of the beam asymmetry parameter Σ for neutral pion photoproduction in the energy range 1.2–2.8 GeV

1976 ◽  
Vol 104 (2) ◽  
pp. 253-276 ◽  
Author(s):  
P.J. Bussey ◽  
C. Raine ◽  
J.G. Rutherglen ◽  
P.S.L. Booth ◽  
L.J. Carroll ◽  
...  
Keyword(s):  
Energy Range ◽  
Asymmetry Parameter ◽  
Neutral Pion ◽  
Pion Photoproduction ◽  
Beam Asymmetry

scholarly journals A NEW MEASUREMENT OF BEAM ASYMMETRY IN PION PHOTOPRODUCTION FROM THE NEUTRON USING CLAS

2009 ◽  
Vol 24 (02n03) ◽  
pp. 497-500
Author(s):  
◽  
D. SOKHAN ◽  
D. WATTS ◽  
D. BRANFORD ◽  
F. KLEIN
Keyword(s):  
Energy Range ◽  
Excitation Spectrum ◽  
Preliminary Analysis ◽  
Pion Photoproduction ◽  
Photon Beam ◽  
Data Set ◽  
Beam Asymmetry ◽  
Large Acceptance ◽  
Photoproduction Reaction ◽  
Neutron Excitation

We present a preliminary analysis of the photon beam asymmetry observable (Σ) from the photoproduction reaction channel γn → π-p. This new data was obtained using the near-4π CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory, USA, employing a linearly polarised photon beam with an energy range 1.1 - 2.3 GeV. The measurement will provide new data to address the poorly established neutron excitation spectrum and will greatly expand the sparse world data-set both in energy and angle.

Experimental study of the photoemission of protons off12C using tagged photons in the energy range 200?385 MeV

1980 ◽  
Vol 298 (2) ◽  
pp. 103-111 ◽  
Author(s):  
J. Arends ◽  
J. Eyink ◽  
H. Hartmann ◽  
A. Hegerath ◽  
B. Mecking ◽  
...  
Keyword(s):  
Experimental Study ◽  
Energy Range ◽  
Tagged Photons

Hadron reactions study with the CMD-3 detector in e+e− collisions

2016 ◽  
Vol 31 (33) ◽  
pp. 1630038
Author(s):  
E. P. Solodov ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
V. S. Banzarov ◽  
...  
Keyword(s):  
Energy Range ◽  
Invariant Mass ◽  
Energy Dependence ◽  
Cross Section ◽  
Cross Sections ◽  
Final States ◽  
Preliminary Results ◽  
Mass Distributions ◽  
Electron Positron ◽  
Intermediate States

The CMD-3 detector has been taking data since December 2010 at the VEPP-2000 electron–positron collider. The collected data sample corresponds to about 60 inverse picobarn of integrated luminosity in the c.m. energy range from 0.32 GeV to 2.0 GeV. Preliminary results of the analysis of various hadronic cross-sections, in particular, [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], 3[Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are presented. The processes with multi-hadron final states have several intermediate states which have to be taken into account to correctly describe the angular and invariant mass distributions, as well as cross-section energy dependence.

The polarized beam asymmetry for γd→pn in the energy range 0.4−0.8 GeV

1982 ◽  
Author(s):  
F. V. Adamyan ◽  
G. V. Arustamyan ◽  
P. I. Galumyan ◽  
V. H. Grabsky ◽  
H. H. Hakopyan ◽  
...  
Keyword(s):  
Energy Range ◽  
Beam Asymmetry ◽  
Polarized Beam

scholarly journals Preliminary results on CMD-3 measurement of e+e−→ π+π− cross section

2019 ◽  
Vol 218 ◽  
pp. 02006 ◽  
Author(s):  
Fedor Ignatov ◽  
I.B. Logashenko ◽  
R.R. Akhmetshin ◽  
A.N. Amirkhanov ◽  
A.V. Anisenkov ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Range Analysis ◽  
Preliminary Results ◽  
Electron Positron ◽  
Integrated Luminosity

The CMD-3 detector has been successfully collecting data at the electron-positron collider VEPP-2000 since December 2010. The first scan below 1 GeV for a π+π− measurement was performed in 2013. The collected data sample corresponds to about 18 pb−1 of integrated luminosity in this energy range. Analysis of the e+e−→ π+π− cross section is in progress. Status of this measurement are presented.

Fissilities of 238U and 237Np nuclei measured with tagged photons in the energy range 60–240 MeV

1992 ◽  
Vol 539 (2) ◽  
pp. 263-275 ◽  
Author(s):  
A.S. Iljinov ◽  
D.I. Ivanov ◽  
M.V. Mebel ◽  
V.G. Nedorezov ◽  
A.S. Sudov ◽  
...  
Keyword(s):  
Energy Range ◽  
Tagged Photons

scholarly journals Study of 3He(n,p)3H reaction at cosmological energies with trojan horse method

2020 ◽  
Vol 227 ◽  
pp. 02013 ◽  
Author(s):  
C. Spampinato ◽  
R.G. Pizzone ◽  
R. Spartà ◽  
M. Couder ◽  
W. Tan ◽  
...  
Keyword(s):  
Energy Range ◽  
Big Bang ◽  
Trojan Horse ◽  
Big Bang Nucleosynthesis ◽  
Preliminary Results ◽  
Trojan Horse Method ◽  
Gamow Energy ◽  
The Big Bang

In the network of reactions present in the Big Bang nucleosynthesis, the 3He(n, p)3H has an important role which impacts the final 7Li abundance. The Trojan Horse Method (THM) has been applied to the 3He(d, pt)H reaction in order to extract the astrophysical S(E)-factor of the 3He(n, p)3H in the Gamow energy range. The experiment will be described in the present work together with the first preliminary results.

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