Vacuum polarization and D-wave α−α scattering

1969 ◽  
Vol 47 (1) ◽  
pp. 113-115 ◽  
Author(s):  
Mark W. Kermode
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Vacuum Polarization ◽  
Center Of Mass ◽  
Phase Shifts ◽  
Differential Cross Sections ◽  
Wave Phase ◽  
Low Energies ◽  
D Wave

The D-wave phase shifts for α−α scattering at low energies are obtained from (i) new analyses of the differential cross sections and (ii) the effects of vacuum polarization. The results are −0.4° (−0.4°), −0.2° (−0.4°), +0.2° (−0.4°), −0.2° (−0.2°), and 0.3° (0.2°) for the center-of-mass energies 0.3, 0.425, 0.5, 0.75, and 1.0 MeV, respectively. It is felt that these results are significant.

scholarly journals Measurements of the differential cross sections of the production of Z + jets and γ + jets and of Z boson emission collinear with a jet in pp collisions at $$ \sqrt{s} $$ = 13 TeV

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
◽  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
F. Ambrogi ◽  
...  
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Z Boson ◽  
Center Of Mass ◽  
Z Bosons ◽  
Differential Cross Sections ◽  
Pp Collisions ◽  
Center Of Mass Energy ◽  
Cms Experiment ◽  
Theoretical Predictions

Abstract Measurements of the differential cross sections of Z + jets and γ + jets production, and their ratio, are presented as a function of the boson transverse momentum. Measurements are also presented of the angular distribution between the Z boson and the closest jet. The analysis is based on pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 35.9 fb−1 recorded by the CMS experiment at the LHC. The results, corrected for detector effects, are compared with various theoretical predictions. In general, the predictions at higher orders in perturbation theory show better agreement with the measurements. This work provides the first measurement of the ratio of the differential cross sections of Z + jets and γ + jets production at 13 TeV, as well as the first direct measurement of Z bosons emitted collinearly with a jet.

Determination of single neutron spectroscopic factor of doubly shell closed, neutron shell closed and neutron-rich nuclei through (d,p) reaction

2020 ◽  
Vol 29 (06) ◽  
pp. 2050030
Author(s):  
A. Vinayak ◽  
M. M. Hosamani ◽  
P. N. Patil ◽  
N. M. Badiger
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Spectroscopic Factor ◽  
Center Of Mass ◽  
Recoil Nucleus ◽  
Projectile Energy ◽  
Neutron Separation Energy ◽  
Differential Cross Sections ◽  
Separation Energy ◽  
Neutron Shell

The spectroscopic factor (SF) of doubly-magic nuclei, neutron shell closed and neutron-rich nuclei has been determined through ([Formula: see text], [Formula: see text]) reaction in the projectile energy range from 3 to 26[Formula: see text]MeV. The theoretical angular differential cross-sections of ([Formula: see text], [Formula: see text] reactions in scattering center-of-mass angles from [Formula: see text] to [Formula: see text] have been calculated using FRESCO and NRV-DWUCK5 codes. By comparing the theoretical angular differential cross-sections with available experimental angular differential cross-sections, the values of SF have been determined. The exponential increase of SF as a function of neutron separation energy normalized by spin of the recoil nuclei has been shown for the first time for doubly-magic nuclei. The similar type of trend has also been observed for neutron-rich as well as neutron shell closed nuclei as a function of neutron separation energy normalized by asymmetric factor of recoil nucleus. More experimental data are required to verify the trend predicted by this investigation.

scholarly journals The Angular Distribution of 1·79 MeV Neutrons Scattered from Helium

1963 ◽  
Vol 16 (2) ◽  
pp. 185 ◽  
Author(s):  
PG Young ◽  
GG Ohlsen ◽  
PL Okhuysen
Keyword(s):  
Angular Distribution ◽  
Cross Sections ◽  
Differential Cross ◽  
Phase Shifts ◽  
Differential Cross Sections ◽  
Angular Range

The angular distribution of 1�79 �O� 05 Me V neutrons scattered from 'He has been measured in an effort to settle" a discrepancy in the phase shifts. The laboratory angular range 25� to 135� was covered. The results are compared with differential cross sections computed from the phase shifts of Dodder and Gammel (1952) and Demanins et al. (1962), and the data are seen to agree best with the former.

χ2 analysis of p–d differential cross sections at low energies

2001 ◽  
Vol 689 (1-2) ◽  
pp. 349-352 ◽  
Author(s):  
A. Kievsky ◽  
M.H. Wood ◽  
C.R. Brune ◽  
B.M. Fisher ◽  
H.J. Karwowski ◽  
...  
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Low Energies

scholarly journals H(t Vector,t)H scattering at low energies. [Differential cross sections, vector analyzing powers, 1. 26 to 3. 71 MeV cm]

1977 ◽  
Author(s):  
R.F. Jr. Haglund ◽  
D. Fick ◽  
P.A. Schmelzbach ◽  
G.G. Ohlsen ◽  
N. Jarmie ◽  
...  
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Differential Cross Sections ◽  
Analyzing Powers ◽  
Low Energies
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