Conveners
Spin physics in Nuclear Reactions and Nuclei
- Or Hen (MIT)
- Francesco Becattini (FI)
Spin physics in Nuclear Reactions and Nuclei
- Or Hen (MIT)
- Francesco Becattini (FI)
Spin physics in Nuclear Reactions and Nuclei
- Or Hen (MIT)
- Francesco Becattini (FI)
Spin physics in Nuclear Reactions and Nuclei
- Francesco Becattini (FI)
- Or Hen (MIT)
Dr
Igor Korover
(NRCN)
10/09/2018, 14:30
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
The nuclear force that binds nucleons together is predominantly scalar, i.e., spin and isospin independent. This force includes tensor, spin-isospin and other components, but these parts are much weaker than the main scalar part. Since the scalar force is attractive at typical distances between nucleons in nuclei and becomes repulsive at shorter distances, it must vanish in between, and there...
Mr
Reynier Cruz Torres
(MIT)
10/09/2018, 14:50
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
Due to their complexity, atomic nuclei are traditionaly studied using effective theories. While these tend to describe the low-momentum part of the nucleon momentum distribution well, they fail to describe two-nucleon short-range correlations (SRC). The latter account for approximately 20% of nucleons in the nucleus and dominate the many-body wave function at short distances. The Contact...
Dr
Vladimir Ladygin
(VBLHEP JINR)
10/09/2018, 15:10
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
The results on the angular dependencies of the vector Ay and tensor Ayy and Axx analyzing powers in deuteron-proton elastic scattering at large scattering angles are presented. These data were obtained at internal target at JINR Nuclotron in the energy range 400-1800 MeV using polarized deuteron beam from new polarized ion source [1].
New data on the deuteron analyzing powers in in the...
Prof.
Elena Long
(University of New Hampshire)
10/09/2018, 15:30
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
Whenever technological advancements provide access to a new degree of freedom, previously inaccessible quantities can be measured. Currently, we are seeing the beginning of a renaissance of experiments utilizing a tensor polarized target to probe the structure of the deuteron. This is due to two recent developments: the JLab 12 GeV upgrade, and a high-luminosity, high-tensor-polarized target....
Prof.
Israel Mardor
(Tel Aviv University, Tel Aviv, Israel)
10/09/2018, 16:40
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
I will report on recent polarization transfer experiments carried out at the Mainz Microtron (MAMI), via the quasi-elastic A(e ⃗,e^' p ⃗ ) reaction, over a wide range of missing momentum and virtuality. We measured the ratio (Px/Pz)A of the transverse to longitudinal components of polarization transferred from an electron to a bound proton in 2H and 12C [1, 2] , and transverse (Px and Py) and...
156.
Measurement of Vector and Tensor Asymmetries in Quasielastic Electron Scattering from Deuterium
Prof.
Richard Milner
(MIT)
10/09/2018, 17:00
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
The measurement of the beam-vector and tensor asymmetries in quasielastic electrodisintegration
of the deuteron at the MIT-Bates Linear Accelerator Center up to missing momentum of 500 MeV/c. Data were collected simultaneously over a momentum transfer range 0.1 < Q2 < 0.5 (GeV/c)2 with the Bates Large Acceptance Spectrometer Toroid using an internal deuterium gas target, polarized...
Dr
Sergey Dymov
(INFN)
10/09/2018, 17:20
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
The hadron reactions with the production of a diproton final state, which is a proton pair $\{pp\}_s$
with small excitation energy, have been studied extensively at ANKE-COSY.
These included the break-up process $pd\to \{pp\}_sn$ at high and low momentum transfer,
the $pN\to\{pp\}_s\pi$ one pion production, the $pp\to\{pp\}_s\gamma$ reaction and study of
the ABC effect in the...
Prof.
Yury Uzikov
(Joint Institute for Nuclear Researches)
10/09/2018, 17:40
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
Intrinsic electric dipole momenta (EDM) of particles and atoms if they do exist will indicate directly to time-reversal invariance violation (and CP violation under CPT symmetry) as well as P-parity violation. Knowledge of these signals is important to understand origin of matter-antimatter asymmetry of the Universe. An EDM of charged particles can be observed by measuring the rate of spin...
Katherine Woodruff
(New Mexico State University)
11/09/2018, 14:30
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
One of the least constrained contributions to the neutral current (NC) elastic
neutrino-proton cross section is the strange axial form factor, which
represents the strange quark spin contribution to the spin structure of the
proton. This becomes the net strange spin contribution, $\Delta s$, in the
limit when the negative four-momentum transfer squared ($Q^2$) is zero. The
strange...
Dr
Carlos Ayerbe Gayoso
(The College of William and Mary)
11/09/2018, 15:05
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
The Barely Off-Shell Nucleon Structure (BONuS) experiment at CLAS will measure the neutron structure function $F_2$ for $0.1 < x < 0.8$ over a broad $Q^2$ range, from 1 to 14 GeV$^2 /c$, using electron scattering from deuterium with spectator-proton tagging. By selecting the low-momentum recoil protons at large backward angles, final-state interactions as the deuteron breaks up can be...
Marco Ripani
(GE)
11/09/2018, 15:40
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
Several experiments at Jefferson Lab have collected a large amount of data on the spin structure of nucleons using a polarized electron beam directed onto various polarized targets (NH3, ND3, and 3He). In these double polarization experiments, either the double spin asymmetries A|| and A⊥ or the polarized cross section differences Δσ|| and Δσ⊥ are measured with unprecedented precision and...
Mr
George Prokhorov
(JINR), Prof.
Oleg Teryaev
(JINR)
11/09/2018, 16:40
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
The relation of polarization in heavy-ion collisions to axial anomaly is systematically explored. The qualitative description of and quantitative
comparison with experimental data is discussed. The comparison to thermodynamocal approach to polarization is performed. The quark and hadronic degrees of freedom and duality between them are discussed. The role od mass effects, dissipation and...
Michal Krelina
(Universidad Técnica Federico Santa María)
11/09/2018, 17:05
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
We investigate the spin-flip component of the Pomeron using the single spin asymmetry, $A_N(t)$, arising from Coulomb-nuclear interference (CNI) in small-angle elastic scattering.
The study of elastic proton-nucleus scattering is important because it suppresses or excludes the contributions from iso-vector Reggeons which are predominantly spin-flip, and might have a significant impact on the...
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna ))
11/09/2018, 17:30
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
Spin correlations for the $\Lambda \Lambda$ and
$\Lambda \bar{\Lambda}$ pairs, generated in relativistic
heavy-ion collisions, and related angular correlations at the
joint registration of space-parity nonconserving hadronic decays
of two hyperons are theoretically analyzed.
These correlations give important information about the character
and mechanism of multiple processes, and the...
Dr
Valery Lyuboshitz
(Joint Institute for Nuclear Research ( Dubna ))
11/09/2018, 17:55
Spin Physics in Nuclear Reactions and Nuclei
Parallel Sessions
The electromagnetic processes of annihilation of $(e^+ e^-)$ pairs --
which may be generated, in particular, in relativistic nucleus-nucleus and hadron-nucleus collisions -- into heavy flavor lepton pairs are
theoretically studied in the one-photon approximation, using the
technique of helicity amplitudes . For the process $e^+ e^- \rightarrow
\mu^+\mu^-$, it is shown that -- in the...
