About Laboratory

V. P. Dzhelepov, renowned Russian scientist, was one of the founders of the Institute of Nuclear Problems (1948) and later of the Joint Institute for Nuclear Research in Dubna, where he was director (1956–1988) and since 1988 honorary director of the Laboratory of Nuclear Problems.

V. P Dzhelepov

В КОНЦЕ 1949 года был введен в действие один из важнейших ядерных объектов нашей страны — пятиметровый синхроциклотрон, который был способен ускорять частицы до рекордных в то время энергий и по своим параметрам превосходил ускоритель, сооруженный в 1946 году в Беркли американцами. Тем самым был заложен фундамент крупнейшего физического исследовательского центра, который с 1956 года стал известен всему миру как Объединенный институт ядерных исследований.


А.С. Жемчугов: "Отчёт о выполнении работ, выполненных в ОИЯИ по Соглашению о предоставлении субсидии с Минобрнауки от 17 сентября 2014г. № 14.618.21.0001 по теме "Создание гибридных пиксельных детекторов большой площади на основе сенсоров из модифицированного арсенида галлия GaAs:Cr и микросхем считывания Medipix3RX для источников синхротронного излучения и источников нейтронов (GALAPAD-2)" на этапе №3."

Archive of seminars

27 November 201515 : 00 Конференц-зал ЛЯП   Общелабораторный семинар

Katherin Shtejer Diaz (University of Turin)

ALICE is one of four large experiments at the CERN Large Hadron Collider. Located 52 meters underground with 28 meters of overburden rock, it has also been used to detect atmospheric muons produced by cosmic ray interactions in the upper atmosphere. The multiplicity distribution of these cosmic ray muon events and their comparison with Monte Carlo simulation is presented. This analysis exploits the large size and excellent tracking capability of the ALICE Time Projection Chamber. A special emphasis is given to the study of high multiplicity events containing more than 100 reconstructed muons and corresponding to a muon areal density larger than 6.7 m−2. Similar high muon multiplicity events have been studied in previous underground experiments such as ALEPH and DELPHI at LEP. While these experiments were able to reproduce the measured muon multiplicity distribution with Monte Carlo simulation at low and intermediate multiplicities, they failed to reproduce the frequency of the highest multiplicity events.
We demonstrate that the high muon multiplicity events observed in ALICE stem from primary cosmic rays with energies above 10^16 eV.
The frequency of these events can be successfully described by assuming a heavy mass composition of primary cosmic rays in this energy range
and using the most recent hadronic interaction models to simulate the development of the resulting air showers.