Events

Detecting single gravitons with quantum sensing, Mgr. Pavel Stránský, Ph.D. (IPNP FMP CU), Informal Friday Coffee Club seminar, seminar room A 945, Friday November 29th, 13:30

This seminar will review the recently published paper [1], which proposes and discusses the feasibility of an experiment to observe the exchange of energy quanta between matter and gravitational waves. In cross-correlation with classical gravitational wave detectors, such as LIGO, this experiment could allow for the detection of single gravitons.

[1] G. Tobar, S.K. Manikandan, T. Beitel et al., Detecting single gravitons with quantum sensing, Nat. Commun. 15, 7229 (2024), https://doi.org/10.1038/s41467-024-51420-8; available also on

arXiv:2308.15440

Nobel Prize in Physics 2024, Mgr. Tomáš. Sýkora, Ph.D. (IPNP FMP CU), Informal Friday Coffee Club seminar, seminar room A 945, Friday November 22nd, 13:30

The Nobel Prize in Physics 2024 was awarded jointly to John J. Hopfield and Geoffrey E. Hinton “for foundational discoveries and inventions that enable machine learning with Artificial Neural Networks” (ANNs).  The informal seminar is devoted in its first part to the basic ideas and works in the field of ANNs for which both laureates got the prize (1/2 + 1/2). The second part partly summarizes arguments causing shared fear of both Nobel prize winners from (misuse of) Artificial Intelligence, which can, in the end, overcome the contemporary human one. 

Measurement of VH(H->bb) process with the ATLAS experiment, Yicong Huang, Ph.D. (IPNP FMP CU), informal Friday Coffee Club seminar, seminar room A 945, Friday October 25th, 13:30

This seminar presents a measurement for a Higgs boson produced in association with a W or Z boson and decaying to a bb pair. The analyzed data samples, corresponding to an integrated luminosity of 139 fb^-1, were collected in proton-proton collisions at the LHC at a center-of-mass energy of 13 TeV from 2015 to 2018 (Run 2) by the ATLAS detector. The measurement focuses on high vector boson transverse momentum phase spaces where the decay products of the Higgs boson can be effectively reconstructed as a large-radius jet (R = 1.0). The reconstruction of the large radius jet collections, in particular the jet energy and mass scale calibration are also presented.

Meeting with Ph.D. students

The traditional informal meeting with PhD students and supervisors will take place on Friday, October 11, at 14.00 (A945 or will be specified later).

The surprisingly large neutron capture cross-section of $^{88}$Zr, Mgr. Stanislav Valenta, Ph.D. (IPNP FMP UK), half an hour Friday Coffee Club seminar, seminar room A 945, Friday October 4th, 13:30

In 2019 Shusterman et al. published in Nature [1] their measurement of neutron capture cross section of 88Zr. The result of 861 kb means that this is the second-largest thermal neutron capture cross-section ever measured. Two years later, authors also reported a huge resonance integral of 2.530 Mb [2], which is in fact the surprising result for the nuclear physics community. As such, it further strengthened the sparked interest. Recently, the neutron capture cross-section was measured at two time-of-flight facilities, namely using the DICER instrument at LANSCE in LANL, and at the n_TOF facility in CERN. Most importantly, the DICER result [3] on the resonance integral disputes the Shusterman’s. I would like to briefly describe the techniques, present the results, and discuss why the DICER values are more “natural” considering the statistical model of nucleus. If available and possible, I will also show the status of the n_TOF measurement.

[1] https://doi.org/10.1038/s41586-018-0838-z

[2] https://doi.org/10.1103/PhysRevC.103.024614

[3] https://doi.org/10.21203/rs.3.rs-3331910/v1

Meeting with students

The meeting with students takes place on Monday September 30 at 12.20 in the A945 room (big lecture room on the 9th floor). All interested ones in the study of the Particle and Nuclear Physics branch are kindly invited. The meeting will be held in Czech a meeting with a non-Czech speaking students will be organized separately.

The lecture “Fyzika elementárních částic” (NJSF105) will start after the meeting, likely at about 1 PM.