Temat: nuclei - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Search for $\eta$‐mesic helium using WASA‐at‐COSY
Autorzy:: Moskal, Paweł
Wydawca:: American Institute of Physics
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Inne

na półce

Skocz do pozycji: 2.

Tytuł:: A modified Nuclear Model for Binding Energy of Nuclei
Autorzy:: Sirma, K. K.
Chelimo, L. S.
Khanna, K. M.
Tematy:: Core
Heavy Nuclei
Isotones
Isotopes
Potential
Surface region
light Nuclei; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/1030120.pdf Link otwiera się w nowym oknie
Opis:: A new nuclear model to calculate the binding energy of nuclei is proposed. The nucleus is assumed to be composed of two regions; the inner core region and surface region. The inner core is assumed to be composed of Z proton-neutron pairs (Z = N) and the surface region is composed of the unpaired neutrons for a nucleus in which N>Z. The interaction between the core and neutrons in the surface region is assumed to be such that it leads to an average potential Vo in which each neutron in the surface region can move. Knowing the experimental values for the binding energy of nuclei, this average interaction potential Vo has been calculated for light, medium and heavy nuclei. It is found that Vo varies for isotopes and isotones. For isotopes the value of Vo decreases as the neutron number (N) in the surface region of the nucleus increases. The decrease in Vo is quite large when the neutron number increases by unity in light nuclei compared to heavy nuclei. For isotones, the value of Vo increases with an increase in proton number (Z). This is evident for both light nuclei and heavy nuclei.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Identifying the secondary jet in the RadioAstron image of OJ 287
Autorzy:: Berdyugin, Andrei V.
Nilsson, Kari
Jelínek, Martin
Matsumoto, Katsura
Mugrauer, Markus
Uemura, Makoto
Zhang, Zhongli
Ogloza, Waldemar
Kishore, Shubham
Štrobl, Jan
Ciprini, Stefano
Drozdz, Marek
Zejmo, Michal
Reichart, Daniel E.
Kouprianov, Vladimir V.
Hudec, Rene
Pursimo, Tapio
Susobhanan, Abhimanyu
Valtonen, Mauri J.
Sadun, Alberto
Dey, Lankeswar
Gu, Minfeng
Gupta, Alok C.
Wiita, Paul J.
Davidson, James W.
Imazawa, Ryo
Gopakumar, Achamveedu
Nakaoka, Tatsuya
Zoła, Stanisław
Opis:: The 136 yr long optical light curve of OJ 287 is explained by a binary black hole model where the secondary is in a 12 yr orbit around the primary. Impacts of the secondary on the accretion disk of the primary generate a series of optical flares that follow a quasi-Keplerian relativistic mathematical model. The orientation of the binary in space is determined from the behavior of the primary jet. Here, we ask how the jet of the secondary black hole projects onto the sky plane. Assuming that the jet is initially perpendicular to the disk, and that it is ballistic, we follow its evolution after the Lorentz transformation to the observer’s frame. Since the orbital speed of the secondary is of the order of one-tenth of the speed of light, the result is a change in the jet direction by more than a radian during an orbital cycle. We match the theoretical jet line with the recent 12 μas resolution RadioAstron map of OJ 287 and determine the only free parameter of the problem, the apparent speed of the jet relative to speed of light. It turns out that the Doppler factor of the jet, δ ∼ 5, is much lower than in the primary jet. Besides following a unique shape of the jet path, the secondary jet is also distinguished by a different spectral shape than in the primary jet. The present result on the spectral shape agrees with the huge optical flare of 2021 November 12, also arising from the secondary jet.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego