Finite-range simple effective interaction including tensor terms

ACKNOWLEDGMENTS Useful discussions with F. Stancu are warmly acknowledged. P. Bano acknowledges the support from MANF Fellowship of UGC, India. T.R.R. gives sincere thanks to Professor B. Behera for meaningful discussions. M.C. and X.V. were partially supported by Grants No. PID2020-118758GBI00 and No. CEX2019-000918-M (through the “Unit of Excellence María de Maeztu 2020-2023” award to ICCUB) from the Spanish MCIN/AEI (DOI 10.13039/501100011033). The work of L.M.R. was partly supported by the Spanish MINECO Grant No. PGC2018-094583-B-I00. M.A. has been partially supported by the Spanish MINECO Grant No. PID2019-104888GB-I00.An existing parametrization of the simple effective interaction (SEI) that is able to reproduce the experimentally known crossing between the 2p3/2 and 1f5/2 single-particle (s.p.) proton levels in neutron-rich Ni isotopes has been generalized. We have added a short-range tensor force in order to describe the observed gaps between the 1h11/2 and 1g7/2s.p. proton levels in the Sn isotopic chain and between the 1i13/2 and 1h9/2s.p. neutron levels in N=82 isotones without compromising the good agreement with the splittings in the Ni isotopes. Different scenarios where tensor effects are relevant are considered with the new interaction and its predictions are compared with results from other mean-field models and experimental data where available.MANF Fellowship of UGCUniversity Grants Commission CEX2019-000918-M, PID2020-118758GB-I00Ministerio de Economía y Competitividad PGC2018-094583-B-I00, PID2019-104888GB-I00Agencia Estatal de InvestigaciónInstituto de Ciencias del Cosmos, Universitat de Barcelona (ICCUB

Effect of short- and long-range correlations on neutron skins of various neutron-rich doubly magic nuclei

We study the effects of correlations beyond the independent particle model in the evaluation of neutron skins of various neutron-rich doubly magic nuclei.We consider short- and long-range correlations to take into account the presence of the strongly repulsive core of the bare nucleon-nucleon interaction and collective nuclear phenomena, respectively. Despite the strong sensitivity on the structure of the nucleus considered, our results indicate that, in general, correlations increase the values of the neutron skins.Junta de Andalucia FQM387Spanish Government PID2019-104888GB-I00European Commissio

General Purpose Transistor Characterized as Dosimetry Sensor of Proton Beams

This research has been partially funded by Junta de Andalucía (Spain), project numbers PI-0505-2017 FEDER/Junta de Andalucía-Consejería de Economía y Conocimiento Project B-TIC-468- UGR18; Ministerio de Ciencia e Innovación, Proyecto del Plan Nacional I + D: PID2019-104888 GB-I00 and Proyectos I + D + i Junta de Andalucía 2018: P18-RT-3237. This work has been also conducted in the framework of European Union H2020 ELICSIR project (grant No. 857558).A commercial pMOS transistor (MOSFET), 3N163 from Vishay (USA), has been character- ized as a low-energy proton beam dosimeter. The top of the samples’ housing has been removed to guarantee that protons reached the sensitive area, that is, the silicon die. Irradiations took place at the National Accelerator Centre (Seville, Spain). During irradiations, the transistors were biased to improve the sensitivity, and the silicon temperature was monitored activating the parasitic diode of the MOSFET. Bias voltages of 0, 1, 5, and 10 V were applied to four sets of three transistors, obtaining an averaged sensitivity that was linearly dependent on this voltage. In addition, the short-fading effect was studied, and the uncertainty of this effect was obtained. The bias voltage that provided an acceptable sensitivity, (11.4 ± 0.9) mV/Gy, minimizing the uncertainty due to the fading effect (−0.09 ± 0.11) Gy was 1 V for a total absorbed dose of 40 Gy. Therefore, this off-the-shelf electronic device presents promising characteristics as a dosimeter sensor for proton beams.Junta de Andalucia B-TIC-468-UGR18Ministry of Science and Innovation, Spain (MICINN) 2018: P18-RT-3237European Commission PI-0505-2017 FEDERJunta de Andalucia-Consejeria de Economia y Conocimiento ProjectPID2019-104888 GB-I00European Union H2020 ELICSIR project 85755

Multiple scattering calculations for proton beams: Comparison of results from the general-purpose Monte Carlo codes penh, fluka and topas

This work has been partially supported by the Spanish Ministerio de Ciencia y Competitividad ( PID2019-104888GB-I00 ), the European Regional Development Fund (ERDF) and the Junta de Andalucía, Spain ( FQM387 , P18-RT-3237 ). One of us (M.A.) thanks J. Schuemann and H. Paganetti for useful discussions. Funding for open access charge by Universidad de Granada / CBUA is also acknowledged.Purpose: To test the multiple Coulomb scattering theories implemented in the Monte Carlo simulation codes PENH, FLUKA and TOPAS. Methods: Simulations with the three codes of proton beams with initial energies between 100 and 220 MeV impinging normally on slabs of 14 different compositions and various thicknesses were performed. The simulated angular distributions of transmitted protons are very approximately Gaussian with a characteristic angle θ0, which measures the spread of the distribution. The characteristic angles resulting from the simulations are compared to experimental data available from two experiments. The degree of agreement is quantified by the χ2 statistic. The 151 cases considered are analyzed by grouping the data in various ways (all together, by experiment, according to the energy of the proton beam or the slab material). Results: In general, PENH produced the better description of the experimental data. If all data are included, the χ2 values were 3.7±0.6 for PENH, 18.7±0.4 for FLUKA and 7.4±1.5 for TOPAS. The ranges in the values of χ2 obtained for the various data groups are [0.1±0.2;10.7±4.1] for PENH, [0.10±0.03;221.1±7.8] for FLUKA, and [0.2±0.3;46.2±26.4] for TOPAS. The minimum and maximum values in these ranges occur, in the three codes, for the Zn and the brass slabs, respectively, with 158.6MeV protons. Conclusions: The three codes provide a reasonably accurate description of multiple scattering distributions of protons transmitted through material slabs. Brass is the material whose experimental data are worst described by the three codes analyzed.Spanish Ministerio de Ciencia y Competitividad PID2019-104888GB-I00European Regional Development Fund ERDFJunta de Andalucía FQM387, P18-RT-3237Universidad de Granada / CBU

Restauración de la simetría del número de partículas en teorías de campo medio con la fuerza de Gogny

Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Teórica. Fecha de lectura: 19-05-2000En el modelo HFB se tratan al mismo nivel las correlaciones nucleares de largo alcance (partícula-hueco), descritas por el campo de Hartree-Fock r y las correlaciones partícula-particula originadas por la parte de corto alcance de la fueriza nuclear y repiecentadas a traves del tensor de apareamiento nuclear A. Sin embargo, Ia teoría de HFB viola varias simetrías, entre. ellas la de conservación del número de partículas. Es precisaniente esta ruptura de simetría la que perniite al modelo de Hartree-Fock-Bogoliubov incluir correlaciones entre los nucleones que no son tenidas en cuenta en la aproximación HF Resulta por tanto, que la funcion de onda que describe el nucleo en el modelo HFB no es un autoestado del operador N Para recuperar esta simetría perdida es necesario proyectar la función de onda sobre el el subespacio generado por todas las funciones de onda autoestados del operador N con autovalor N0. El resultado de tal proyección, será la función de onda que describe al sistema nuclear con No nucleories En este trabajo se ha llevado a cabo por primera vez una restauración exacta de la simetria del numero de partículas en teorías HFB con una fuerza efectiva de alcance finito y dependiente de la densidad En paiticular, la interacción empleada en los calculos aquí desarrollados es la fuerza de Cogn

Tensor force and deformation in even-even nuclei

This work has been partially supported by the Junta de Andalucia (FQM387), the Spanish Ministerio de Economia y Competitividad (PID2019-104888GB-I00), and the European Regional Development Fund (ERDF).The variational principle is used to build a model which describes open shell nuclei with ground state deformations. Hartree-Fock equations are solved by using single particle wave functions whose radial parts depend on the projection of the angular momentum on the quantisation axis. Pairing effects are taken into account by solving Bardeen-Cooper-Schrieffer equations in each step of the minimization procedure. The Gogny D1S finite-range interaction and an extension of it that includes tensor terms are consistently used in both parts of our calculations. The model is applied to study a set of isotopes with 34 protons and of isotones with 34 neutrons. Total energies, density distributions, their radii, and single particle energies are analyzed and the results of our calculations are compared with the available experimental data. We focused our attention on the effects of the deformation and of the tensor force on these observables. Our model describes open shell nuclei from a peculiar perspective and opens the possibility of future theoretical developments.Junta de Andalucia FQM387Spanish Ministerio de Economia y Competitividad PID2019-104888GB-I00European Commissio

Charge radii of Ca isotopes and correlations

This work has been partially supported by the Junta de Andalucía (FQM387), the Spanish Ministerio de Economía y Competitividad (PID2019-104888GB-I00) and the European Regional Development Fund (ERDF). One of us (G.C.) thanks Sonia Bacca for useful discussions.We study the effects of short- and long-range correlations on the charge radii of Ca isotopes. We start our investigation with an independent particle model consisting of Hartree-Fock plus Bardeen-Cooper-Schrieffer calculations with finite-range effective nucleon-nucleon interactions of Gogny type. The short-range correlation effects are evaluated by considering all the terms of a cluster expansion containing a single correlation line. The long-range correlations are taken into account by including the coupling with the quasiparticle random phase approximation phonons. While the effects of the short-range correlations are negligible, those of the longrange correlations largely modify the independent particle model results and improve the agreement with the experimental data.Ministerio de Economía y Competitividad PID2019-104888GB-I00European Regional Development FundJunta de Andalucía FQM38

Neutronic assessment of the IFMIF-DONES HFTM specimen stack distribution

This work has been supported by the European Union's FEDER program, IFMIF-DONES Junta de Andalucia's program at the Universidad de Granada SE21, by MCIN/AEI/10.13039/501100011033/FEDER, UE (PID2022-137543NB-I00) and has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.IFMIF-DONES (International Fusion Materials Irradiation Facility- DEMO Oriented NEutron Source) is a neutron irradiation facility designed to collect data on material irradiation for the construction of demonstration fusion power plants. This study focuses in investigate the effect of a realistic model of specimens being irradiated in HFTM in IFMIF-DONES, and its comparison with previous results with the homogeneous model. Neutron fluence rate, damage dose rates, and gas production have been calculated for the standard 20 × 5 cm² profile and a 10 × 5 cm² beam size. These calculations were performed for a deuteron beam with an energy of 40 MeV and a current of 125 mA. More realistic neutronics model gives very consistent DPA volumes with the previous. The main difference is a neutron slight streaming in the detailed one. The distribution of DPA shows irregular patterns depending on specimen location. This research highlights the significant role played by specimen distribution in enhancing the accuracy and reliability of dpa measurements within the IFMIF-DONES facility and the influence of the beam size.European Union's FEDER programIFMIF-DONES Junta de Andalucia's programUniversidad de Granada SE21European Union 101052200 — EUROfusionEuropean Commissio

Tesoros bibliográficos de Física en el Hospital Real: De Aristóteles a de Broglie

El catálogo de la exposición bibliográfica muestra un recorrido por la historia de la física a través de más de medio centenar de textos, donde se incluyen autores como Apiano, Ptolomeo, Descartes o Newton, junto con instrumental antiguo de física