Search results for "mass"
showing 10 items of 9693 documents
Ionic liquids: a highway with many lanes
Observation of the proton emitter 116,57La59
2022
The quantum tunneling and emission of a single constituent nucleon provide a beautifully simple and unique window into the complex properties of atomic nuclei at the extreme edge of nuclear existence. In particular, for odd-odd proton emitting nuclides, the associated decay energy and partial half-life can be used to probe the correlations between the valence neutrons and protons which have been theoretically predicted to favour a new type of nuclear superfluidity, isoscalar neutron-proton pairing, for which the experimental “smoking gun" remains elusive. In the present work, proton emission from the lanthanum isotope 11657La59, 23 neutrons away from the only stable isotope 13957La82, is re…
Impact of nuclear mass measurements in the vicinity of 132Sn on the r-process nucleosynthesis
2022
Nuclear masses are a key aspect in the modelling of nuclear reaction rates for the r-process nucleosynthesis. High precision mass measurements drastically reduce the associated uncertainties in the modelling of r-process nucleosynthesis. We investigate the impact of nuclear mass uncertainties on neutron-capture rates calculations using a Hauser – Feshbach statistical code in the vicinity of 132Sn. Finally, we study the impact of the propagated neutron-capture reaction rates uncertainties on the r-process nucleosynthesis. We find that mass measurements with uncertainties higher than 20 keV affect the calculation of reaction rates. We also note that modelling of reaction rates can differ for …
Local Structure Studies of Ti for SrTi16O3 and SrTi18O3 by Advanced X-ray Absorption Spectroscopy Data Analysis
2015
Strontium titanate is a model quantum paraelectric in which in the region of dominating quantum statistics the ferroelectric instability is inhibited due to nearly complete compensation of the harmonic contribution into ferroelectric soft mode frequency by the zero-point motion contribution. The enhancement of atomic masses by the substitution of 18O for 16O decreases the zero-point atomic motion and low-T ferroelectricity in SrTi18O3 is realized. In this study we report on the local structure of Ti in SrTi16O3 and SrTi18O3 by Ti K-edge extended x-ray absorption fine structure measurements in temperature range 6 – 300 K.
Partito e antipartito. Una storia politica della Prima Repubblica (1946-1978)
2004
Il lavoro si propone come un contributo sulla storia politica italiana in eta' repubblicana. Analizza il ruolo del partito politico e le polemiche relative, legittimanti e delegittimanti.
Jet mass and substructure of inclusive jets in $ \sqrt {s} = 7\;{\text{TeV}} $ pp collisions with the ATLAS experiment
2012
Recent studies have highlighted the potential of jet substructure techniques to identify the hadronic decays of boosted heavy particles. These studies all rely upon the assumption that the internal substructure of jets generated by QCD radiation is well understood. In this article, this assumption is tested on an inclusive sample of jets recorded with the ATLAS detector in 2010, which corresponds to 35 pb-1 of pp collisions delivered by the LHC at √s = 7TeV. In a subsample of events with single pp collisions, measurements corrected for detector efficiency and resolution are presented with full systematic uncertainties. Jet invariant mass, kt splitting scales and N-subjettiness variables are…
Uncertainties on the determination of the strong coupling αs from the energy evolution of jet fragmentation functions at low z
2014
The QCD coupling alpha_s is determined at NLO*+NMLLA accuracy from the comparison of experimental jet data to theoretical predictions of the energy-evolution of the parton-to-hadron fragmentation function moments (multiplicity, peak, width, skewness) at low fractional hadron momentum z. From the existing e+e- and e-p jet data, we obtain alpha_s(m_Z^2) = 0.1195 +/- 0.0021 (exp.) {+0.0015}_{-0.0} (scale) at the Z mass. The uncertainties of the extracted alpha_s value are discussed.
Dijet studies with ALICE at the LHC
2020
Relativistisissa hiukkastörmäyksissä syntyvistä suurenergisistä kvarkeista ja gluoneista, eli partoneista, muodostuvaa hyvin kollimoitunutta hiukkassuihkua kutsutaan jetiksi. Jettien tutkimusta on tehty jo vuosikaudet ja se hallitaan hyvin myös raskasionitörmäyksissä, joissa muodostuvaa kvarkkigluoniplasmaa on pystytty tutkimaan jettien liikemäärähäviöiden avulla. Tämän perusteella on huomattu, että kvarkkigluoniplasma jarruttaa sen läpi kulkevia suurenergisiä partoneita. Jettien lisäksi partonien energiahäviöitä raskasionitörmäyksessä on tutkittu myös dijettien avulla. Dijetti on määritelty törmäyksen kahdesta suurimman energian omaavasta jetistä muodostuvaksi systeemiksi. Aiempien RHIC- j…
Reporting in Conflict Zones in Pakistan: Risks and Challenges for Fixers
2020
As a backbone of reporting in war and conflicts, fixers offer essential assistance to the foreign correspondent in conflict zones, also in Pakistan. With valuable local knowledge and contacts, fixers can arrange travel to secure entry of foreign correspondents into conflict zones in addition to securing interviews with otherwise unattainable figures, while offering reliable translation services. Pakistani media, despite being one of the largest and most developed in South Asia, remains under the strict control of powerful military establishment and government, while seeming to mirror the overarching government sentiment with a distinct lack of research-based news. Challenging this state of …
A Relational Approach to How Media Engage With Their Audiences in Social Media
2022
People are increasingly turning to social media for their news and for sharing and discussing news with others. Simultaneously, media organizations are becoming platform-dependent and posting short forms of their news on their social media sites in the hope that audiences will not only consume this news but also comment on and share it. This article joins other media and journalism studies exploring this phenomenon through a relational approach to media audiences to better understand how media organizations, particularly newspapers, are cultivating relationships with audiences via social media. Drawing on public relations theory about organization–public relationships, the article examines …