6,283,742 research outputs found

    Study of deuteron-proton charge exchange reaction at small transfer momentum

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    The charge-exchange reaction pd->npp at 1 GeV projectile proton energy is studied in the multiple-scattering expansion technique. This reaction is considered in a special kinematics, when the transfer momentum from the beam proton to fast neutron is close to zero. The differential cross section and a set of polarization observables are calculated. It was shown that contribution of the final state interaction between two protons is very significant.Comment: 11 pages, 8 figure

    Nuclear effects in positive pion electroproduction on the deuteron near threshold

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    Positive pion electroproduction from the deuteron near threshold has been considered within an approach based on the unitary transformation method. The gauge independence of the treatment is provided by using an explicitly gauge independent expression for the reaction amplitude. The results of calculations for kinematics of the experiments on forward-angle π+\pi^+ meson electroproduction accomplished at Saclay and Jefferson Laboratory are discussed and compared with those given by the impulse approximation. It is shown that the observed behaviour of the cross sections is in accordance with the calculations based on the pion-nucleon dynamics. In particular, the pion production rate suppression in the 2H(e,eπ+)nn^2H(e,e'\pi^+)nn reaction compared to that for the 1H(e,eπ+)n^1H(e,e'\pi^+)n one can be due to such ``nuclear medium'' effects as nucleon motion and binding along with Pauli blocking in the final nnnn state.Comment: 15 pages, 8 figure

    Secure direct communication using Einstein-Podolsky-Rosen pairs and teleportation

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    A novel scheme for secure direct communication between Alice and Bob is proposed, where there is no need for establishing a shared secret key. The communication is based on Einstein-Podolsky-Rosen pairs and teleportation between Alice and Bob. After insuring the security of the quantum channel (EPR pairs), Bob encodes the secret message directly on a sequence of particle states and transmits them to Alice by teleportation. In this scheme teleportation transmits Bob's message without revealing any information to a potential eavesdropper. Alice can read out the encoded messages directly by the measurement on her qubits. Because there is not a transmission of the qubit which carry the secret message between Alice and Bob, it is completely secure for direct secret communication if perfect quantum channel is used

    Near-threshold production of omega mesons in the pn -> d omega reaction

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    The first measurement of the p n -> d omega total cross section has been achieved at mean excess energies of Q = 28 and 57 MeV by using a deuterium cluster-jet target. The momentum of the fast deuteron was measured in the ANKE spectrometer at COSY-Juelich and that of the slow "spectator" proton p(sp) from the p d -> p(sp) d omega reaction in a silicon telescope placed close to the target. The cross sections lie above those measured for p p -> p p omega but seem to be below theoretical predictions.Comment: 7 pages, 8 figures; second approach to describe the background has been added; results changed insignificantly, EPJ in pres

    First Year Experience: Writing Matters

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    Cover and table of contents from the class journal, Writing Matters, produced for the fall 2011 class with instructors Dr. Katherine Schmidt and Dr. Karen Sullivan-Vance. Student submissions were bound together for the Symposium. Assignment: to craft content that matters and to prepare a product that is ready for publication and a public reading. Write to the most important person in your life: describe why they have made such an impact on your life and how you imagine their influence will affect your future; or choose a life-changing event and write to your future self: describe the event, explain why the event has been significant to you, and project how you think the experience should/will influence you in the future

    Circular 101

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    This study was made possible by the financial support of the Alaska Science and Technology Foundation

    Umoja 101

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    The Student group Umoja hosted an event allowing students to learn more about the organization and its resources through networking with current members.Student Activities Offic

    Ecology 101

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    Verbena officinalis L.

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