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Nuclear Theory·nucl-th

Wednesday·July 20, 2022

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    Statistical analysis of proton induced reactions to generate recommended data for the production of medical radio-isotopes

    Sourav Mondal · A. Gandhi · Rebecca Pachuau

    Radio-isotopes produced via proton induced reaction holds special significance regarding nuclear medicine, astrophysical p-process, theragnostic and diagnostic processes. Br, Br and Cu are positron emitter and they are useful in the functional studies via Positron Emission Tomography (PET), whereas Br bears the potential for the application in Single Photon Emission Computed Tomography (SPECT) which involves electron capture process. PET and SPECT have been in high application in medical physics, diagnostics, therapy and nuclear medicine. Tc and Cu are two popular radionuclide which play important role in nuclear medicine, currently being used in bio-medical physics, bone scan, modern imaging, blood pool leveling, oncology and diagnosis of copper related diseases. This paper focus on the generation of recommended nuclear reaction cross sections for the production of some useful medical radio-isotopes using the experimental datasets obtained from EXFOR database and simulated datasets from nuclear reaction model codes TALYS-1.95 and EMPIRE-3.1.1. 95\% confidence interval has been implemented to ensure confidence and precision.

    nucl-thphysics.med-ph0 citations
  2. 02

    Broken axial symmetry as essential feature for a consistent modelling of various observables in heavy nuclei

    Eckart Grosse · Arnd.R. Junghans

    Although most nuclear spectroscopy as well as atomic hyperfine structure data do not deliver accurate information on nuclear axiality the ad-hoc assumption of symmetry about one axis found widespread use in nuclear model calculations. In the theoretical interpretation of nuclear properties as well as in the analysis of experimental data triaxiality was considered - if at all - only for some, often exotic, nuclides. A breaking of axial symmetry combined to a spin-independent moment of inertia results in a surprisingly simple heuristic triaxial parametrization of the yrast sequence in all heavy nuclei, including well deformed ones. No additional fit parameters are needed in detailed studies of the mass and charge dependence of the electric dipole strength in the range of and outside of giant dipole resonances. Allowing triaxiality also avoids the introduction of an arbitrary level density parameter ā to fit the accurate values observed in n-capture experiments and ā can be taken from nuclear matter studies. A combination of this value to the yrast energies no longer based on axiality and the related I(I+1) rule results in agreement to data independent of spin. And predictions for radiative neutron capture as derived on the basis of non-axiality are improved as well. The experimentally favoured broken axial symmetry is in accord to HFB and MC-shell model calculations already for nuclei in the valley of stability.

    nucl-thnucl-exPLB(2022)·7 citations
  3. 03

    Classical vs quantum corrections to jet broadening in a weakly-coupled Quark-Gluon Plasma

    Jacopo Ghiglieri🇫🇷 · Eamonn Weitz🇫🇷

    The transverse momentum broadening coefficient receives both soft, classical and radiative, quantum corrections. The former are responsible for a large O(g) correction, whereas the latter enter at relative order , but are enhanced by a double logarithm of the length of the medium over the thermal wavelength. We analyze radiative corrections for a weakly-coupled quark-gluon plasma. We find that a thermal population of dynamical gluons changes the boundaries and reduces the size of the double-logarithmic phase space. It also provides new subdominant logarithmic corrections. We also show how the quantum, double-logarithmic and classical, soft phase spaces are smoothly connected once the radiated gluon becomes soft enough. Finally, we discuss a pathway to a determination of radiative corrections beyond the harmonic-oscillator approximation.

    ↳ hep-phnucl-thJHEP(2022)·28 citations
  4. 04

    Chiral effects in astrophysics and cosmology

    Kohei Kamada🇯🇵 · Naoki Yamamoto🇯🇵 · Di-Lun Yang🇹🇼

    The microscopic quantum nature of elementary particles, chirality, leads to macroscopic phenomena like the chiral anomaly, chiral magnetic effect, and chiral plasma instability. We review recent progress of the studies of these chiral effects in high-energy astrophysics, such as pulsar kicks, magnetars, and core-collapse supernovae, and early Universe cosmology, such as the primordial magnetic field, baryogenesis, and chiral gravitational waves. We also provide a pedagogical introduction to the chiral effects and low-energy effective theories to describe them in and out of equilibrium -- the chiral (magneto)hydrodynamics, chiral kinetic theory, and chiral radiation transport theory for neutrinos.

    ↳ astro-ph.COastro-ph.HEgr-qchep-ph+1PPNP(2023)·69 citations

Affiliations

first authorsco-authorsvia INSPIRE