Dennis Bonatsos, Andriana Martinou, S. K. Peroulis, T. J. Mertzimekis, N. Minkov
The proxy-SU(3) symmetry was first presented in HINPw4 in Ioannina in May2017, justified within the Nilsson model and applied to parameter-free predictions of the collective variables beta and gamma in medium-mass and heavy nuclei. Major steps forward, including the connection of the proxy-SU(3) symmetry to the shell model, the justification of the dominance of highest weight states in terms of the short range nature of the nucleon-nucleon interaction, as well as the first proposal of appearance of islands of shape coexistence on the nuclear chart, have been presented in HINPw6 in Athens in May 2021. The recently hot topic of the prevalence of triaxial shapes in heavy nuclei will also be briefly outlined in the proxy-SU(3) framework.
{"title":"Seven years of the proxy-SU(3) shell model symmetry","authors":"Dennis Bonatsos, Andriana Martinou, S. K. Peroulis, T. J. Mertzimekis, N. Minkov","doi":"arxiv-2409.04357","DOIUrl":"https://doi.org/arxiv-2409.04357","url":null,"abstract":"The proxy-SU(3) symmetry was first presented in HINPw4 in Ioannina in\u0000May2017, justified within the Nilsson model and applied to parameter-free\u0000predictions of the collective variables beta and gamma in medium-mass and heavy\u0000nuclei. Major steps forward, including the connection of the proxy-SU(3)\u0000symmetry to the shell model, the justification of the dominance of highest\u0000weight states in terms of the short range nature of the nucleon-nucleon\u0000interaction, as well as the first proposal of appearance of islands of shape\u0000coexistence on the nuclear chart, have been presented in HINPw6 in Athens in\u0000May 2021. The recently hot topic of the prevalence of triaxial shapes in heavy\u0000nuclei will also be briefly outlined in the proxy-SU(3) framework.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In heavy-ion collisions, nuclear matter is subjected to extreme conditions in a highly dynamical, rapidly evolving environment. This poses a tremendous challenge for calculating jet quenching observables. Current approaches rely on analytical results for static cases, introducing theoretical uncertainties and biases in our understanding of the pre-equilibrated medium. To address this issue, we employ resummation schemes to derive analytical rates for radiative energy loss in generic, evolving backgrounds. We investigate regimes where rare scattering and multiple scattering with the dynamical medium occurs, and extract relevant scales governing the in-medium emission rate of soft gluons. Our analysis indicates that strong jet quenching is only possible when the equilibration time of the medium is longer than its mean free path, highlighting the importance of medium modifications of jets in the earliest stages of heavy-ion collisions. We also demonstrate analytically that a medium evolution, which initially has a small coupling to jets, typically leads to a stronger jet azimuthal asymmetry at the same jet suppression factor.
{"title":"Sensitivity of jet quenching to the initial state in heavy-ion collisions","authors":"Souvik Priyam Adhya, Konrad Tywoniuk","doi":"arxiv-2409.04295","DOIUrl":"https://doi.org/arxiv-2409.04295","url":null,"abstract":"In heavy-ion collisions, nuclear matter is subjected to extreme conditions in\u0000a highly dynamical, rapidly evolving environment. This poses a tremendous\u0000challenge for calculating jet quenching observables. Current approaches rely on\u0000analytical results for static cases, introducing theoretical uncertainties and\u0000biases in our understanding of the pre-equilibrated medium. To address this\u0000issue, we employ resummation schemes to derive analytical rates for radiative\u0000energy loss in generic, evolving backgrounds. We investigate regimes where rare\u0000scattering and multiple scattering with the dynamical medium occurs, and\u0000extract relevant scales governing the in-medium emission rate of soft gluons.\u0000Our analysis indicates that strong jet quenching is only possible when the\u0000equilibration time of the medium is longer than its mean free path,\u0000highlighting the importance of medium modifications of jets in the earliest\u0000stages of heavy-ion collisions. We also demonstrate analytically that a medium\u0000evolution, which initially has a small coupling to jets, typically leads to a\u0000stronger jet azimuthal asymmetry at the same jet suppression factor.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Superheavy nuclei represent the heaviest atoms and nuclides known at the limit of mass and charge. The observed superheavy nuclei are all proton-rich; they decay primarily by emitting $alpha$ particles and fission, with a possible small electron capture (EC) branch. Due to the huge atomic numbers and associated relativistic effects, EC-decays of superheavy systems are expected to differ from what is known in lighter nuclei. In this paper, using the quantified relativistic nuclear density functional theory and the quasiparticle random-phase approximation with the interaction optimized to experimental $beta^-$-decay half-lives and Gamow-Teller resonance energies, we study the EC/$beta^pm$-decays in $Z = 101-118$ nuclei. Both allowed ($1^+$) and first-forbidden ($0^-, 1^-$ and $2^-$) transitions are considered. We show that the first-forbidden $1^-$ transitions dominate the decay rates in almost all studied nuclei. For proton-rich nuclei, EC dominates over $beta^+$ decay. We identify 44 nuclei with EC/$beta^+$ branching ratio larger than 5%, indicating a possible competition with $alpha$-decay and spontaneous fission channels.
{"title":"Weak decays in superheavy nuclei","authors":"A. Ravlić, W. Nazarewicz","doi":"arxiv-2409.04620","DOIUrl":"https://doi.org/arxiv-2409.04620","url":null,"abstract":"Superheavy nuclei represent the heaviest atoms and nuclides known at the\u0000limit of mass and charge. The observed superheavy nuclei are all proton-rich;\u0000they decay primarily by emitting $alpha$ particles and fission, with a\u0000possible small electron capture (EC) branch. Due to the huge atomic numbers and\u0000associated relativistic effects, EC-decays of superheavy systems are expected\u0000to differ from what is known in lighter nuclei. In this paper, using the\u0000quantified relativistic nuclear density functional theory and the quasiparticle\u0000random-phase approximation with the interaction optimized to experimental\u0000$beta^-$-decay half-lives and Gamow-Teller resonance energies, we study the\u0000EC/$beta^pm$-decays in $Z = 101-118$ nuclei. Both allowed ($1^+$) and\u0000first-forbidden ($0^-, 1^-$ and $2^-$) transitions are considered. We show that\u0000the first-forbidden $1^-$ transitions dominate the decay rates in almost all\u0000studied nuclei. For proton-rich nuclei, EC dominates over $beta^+$ decay. We\u0000identify 44 nuclei with EC/$beta^+$ branching ratio larger than 5%,\u0000indicating a possible competition with $alpha$-decay and spontaneous fission\u0000channels.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vincent Cheung, Zhong-Bo Kang, Farid Salazar, Ramona Vogt
We compute the differential cross section for direct quarkonium production in high-energy electron-nucleus collisions at small $x$. Our computation is performed within the nonrelativistic QCD factorization formalism that separates the calculation into short distance coefficients and long distance matrix elements that depend on the color and spin of the state. We obtain the short distance coefficients of the production of the heavy quark pair within the framework of the Color Glass Condensate effective field theory, which resums coherent multiple interactions of the heavy quark pair with the nucleus to all orders. Our results are expressed as the convolution of perturbatively calculable perturbative functions with multi-point light-like Wilson line correlators. In the correlation limit, we establish the correspondence between our CGC formulation with calculations employing the transverse momentum dependent (TMD) framework. We extend this correspondence by resumming kinematic power corrections within the improved TMD framework, which interpolates between the TMD formalism and $k_perp$ factorization formalism. We present a detailed numerical analysis, focusing on $J/psi$ production in the kinematics accessible at the future Electron-Ion Collider, highlighting the importance of genuine higher-order saturation contributions when the electron collides with a large nucleus.
{"title":"Direct quarkonium production in DIS from a joint CGC and NRQCD framework","authors":"Vincent Cheung, Zhong-Bo Kang, Farid Salazar, Ramona Vogt","doi":"arxiv-2409.04080","DOIUrl":"https://doi.org/arxiv-2409.04080","url":null,"abstract":"We compute the differential cross section for direct quarkonium production in\u0000high-energy electron-nucleus collisions at small $x$. Our computation is\u0000performed within the nonrelativistic QCD factorization formalism that separates\u0000the calculation into short distance coefficients and long distance matrix\u0000elements that depend on the color and spin of the state. We obtain the short\u0000distance coefficients of the production of the heavy quark pair within the\u0000framework of the Color Glass Condensate effective field theory, which resums\u0000coherent multiple interactions of the heavy quark pair with the nucleus to all\u0000orders. Our results are expressed as the convolution of perturbatively\u0000calculable perturbative functions with multi-point light-like Wilson line\u0000correlators. In the correlation limit, we establish the correspondence between\u0000our CGC formulation with calculations employing the transverse momentum\u0000dependent (TMD) framework. We extend this correspondence by resumming kinematic\u0000power corrections within the improved TMD framework, which interpolates between\u0000the TMD formalism and $k_perp$ factorization formalism. We present a detailed\u0000numerical analysis, focusing on $J/psi$ production in the kinematics\u0000accessible at the future Electron-Ion Collider, highlighting the importance of\u0000genuine higher-order saturation contributions when the electron collides with a\u0000large nucleus.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Axel Pérez-Obiol, Sergi Masot-Llima, Antonio M. Romero, Javier Menéndez, Arnau Rios, Artur García-Sáez, Bruno Juliá-Díaz
Simulating a physical system with variational quantum algorithms is a well-studied approach but challenging to implement in current devices due to demands in qubit number and circuit depth. We show how limited knowledge of the system, namely the entropy of its subsystems or its entanglement structure, can be used to reduce the cost of these algorithms with entanglement forging. To do so, we simulate a Fermi-Hubbard one-dimensional chain with a parametrized hopping term, as well as atomic nuclei ${}^{28}$Ne and ${}^{60}$Ti with the nuclear shell model. Using an adaptive variational quantum eigensolver we find significant reductions in both the maximum number of qubits (up to one fourth) and the amount of two-qubit gates (over an order of magnitude) required in the quantum circuits. Our findings indicate that our method, entropy-driven entanglement forging, can be used to adjust quantum simulations to the limitations of current noisy intermediate-scale quantum devices.
{"title":"Entropy-driven entanglement forging","authors":"Axel Pérez-Obiol, Sergi Masot-Llima, Antonio M. Romero, Javier Menéndez, Arnau Rios, Artur García-Sáez, Bruno Juliá-Díaz","doi":"arxiv-2409.04510","DOIUrl":"https://doi.org/arxiv-2409.04510","url":null,"abstract":"Simulating a physical system with variational quantum algorithms is a\u0000well-studied approach but challenging to implement in current devices due to\u0000demands in qubit number and circuit depth. We show how limited knowledge of the\u0000system, namely the entropy of its subsystems or its entanglement structure, can\u0000be used to reduce the cost of these algorithms with entanglement forging. To do\u0000so, we simulate a Fermi-Hubbard one-dimensional chain with a parametrized\u0000hopping term, as well as atomic nuclei ${}^{28}$Ne and ${}^{60}$Ti with the\u0000nuclear shell model. Using an adaptive variational quantum eigensolver we find\u0000significant reductions in both the maximum number of qubits (up to one fourth)\u0000and the amount of two-qubit gates (over an order of magnitude) required in the\u0000quantum circuits. Our findings indicate that our method, entropy-driven\u0000entanglement forging, can be used to adjust quantum simulations to the\u0000limitations of current noisy intermediate-scale quantum devices.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Anna Chen, Juan Diego DelPrado, Thomas W. Baumgarte, Stuart L. Shapiro
Lacking terrestrial experimental data, our best constraints on the behavior of matter at high densities up to and above nuclear density arise from observations of neutron stars. Current constraints include those based on measurements of stellar masses, radii, and tidal deformabilities. Here we explore how orbits of primordial black holes - should they exist - inside neutron stars could provide complementary constraints on the nuclear equation of state (EOS). Specifically, we consider a sample of candidate EOSs, construct neutron star models for these EOSs, and compute orbits of primordial black holes inside these stars. We discuss how the pericenter advance of eccentric orbits, i.e. orbital precession, results in beat phenomena in the emitted gravitational wave signal. Observing this beat frequency could constrain the nuclear EOS and break possible degeneracies arising from other constraints, as well as provide information about the host star.
{"title":"Constraining the nuclear equation of state from orbits of primordial black holes inside neutron stars","authors":"Anna Chen, Juan Diego DelPrado, Thomas W. Baumgarte, Stuart L. Shapiro","doi":"arxiv-2409.04526","DOIUrl":"https://doi.org/arxiv-2409.04526","url":null,"abstract":"Lacking terrestrial experimental data, our best constraints on the behavior\u0000of matter at high densities up to and above nuclear density arise from\u0000observations of neutron stars. Current constraints include those based on\u0000measurements of stellar masses, radii, and tidal deformabilities. Here we\u0000explore how orbits of primordial black holes - should they exist - inside\u0000neutron stars could provide complementary constraints on the nuclear equation\u0000of state (EOS). Specifically, we consider a sample of candidate EOSs, construct\u0000neutron star models for these EOSs, and compute orbits of primordial black\u0000holes inside these stars. We discuss how the pericenter advance of eccentric\u0000orbits, i.e. orbital precession, results in beat phenomena in the emitted\u0000gravitational wave signal. Observing this beat frequency could constrain the\u0000nuclear EOS and break possible degeneracies arising from other constraints, as\u0000well as provide information about the host star.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Martha Ege, Justin Mohs, Jan Staudenmaier, Hannah Elfner
The production of light nuclei in heavy -ion collisions is an excellent probe for studying the phase diagram of quantum chromodynamics and for the search of a critical end point. In this work we apply a hybrid approach in which we study the light nuclei production in the afterburner stage of central Au+Au collisions at $sqrt{s}_{NN}=7.7$, 14.5 and 19.6 GeV. In this stage, light nuclei are produced dynamically in $4leftrightarrow 2$ catalysis reactions. A comparison of the dynamic production and a coalescence approach is presented for transverse momentum spectra of deuterons, tritons, $^3rm He$ nuclei and hypertritons and ratios of light nuclei yields. A good agreement with the experimentally measured yield of nuclei is found and we proceed to further investigate the production mechanisms of light nuclei by calculating the rates of the important channels for the formation and disintegration. We find that the afterburner stage is essential for the description of light nuclei formation in heavy-ion collisions, as light nuclei undergo a large number of interactions.
{"title":"Deuteron, triton, helium-3 and hypertriton production in relativistic heavy-ion collisions via stochastic multi-particle reactions","authors":"Martha Ege, Justin Mohs, Jan Staudenmaier, Hannah Elfner","doi":"arxiv-2409.04209","DOIUrl":"https://doi.org/arxiv-2409.04209","url":null,"abstract":"The production of light nuclei in heavy -ion collisions is an excellent probe\u0000for studying the phase diagram of quantum chromodynamics and for the search of\u0000a critical end point. In this work we apply a hybrid approach in which we study\u0000the light nuclei production in the afterburner stage of central Au+Au\u0000collisions at $sqrt{s}_{NN}=7.7$, 14.5 and 19.6 GeV. In this stage, light\u0000nuclei are produced dynamically in $4leftrightarrow 2$ catalysis reactions. A\u0000comparison of the dynamic production and a coalescence approach is presented\u0000for transverse momentum spectra of deuterons, tritons, $^3rm He$ nuclei and\u0000hypertritons and ratios of light nuclei yields. A good agreement with the\u0000experimentally measured yield of nuclei is found and we proceed to further\u0000investigate the production mechanisms of light nuclei by calculating the rates\u0000of the important channels for the formation and disintegration. We find that\u0000the afterburner stage is essential for the description of light nuclei\u0000formation in heavy-ion collisions, as light nuclei undergo a large number of\u0000interactions.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Li, N. Sparveris, H. Atac, M. K. Jones, M. Paolone, Z. Akbar, M. Ali, C. Ayerbe Gayoso, V. Berdnikov, D. Biswas, M. Boer, A. Camsonne, J. -P. Chen, M. Diefenthaler, B. Duran, D. Dutta, D. Gaskell, O. Hansen, F. Hauenstein, N. Heinrich, W. Henry, T. Horn, G. M. Huber, S. Jia, S. Joosten, A. Karki, S. J. D. Kay, V. Kumar, X. Li, W. B. Li, A. H. Liyanage, D. Mack, S. Malace, P. Markowitz, M. McCaughan, Z. -E. Meziani, H. Mkrtchyan, C. Morean, M. Muhoza, A. Narayan, B. Pasquini, M. Rehfuss, B. Sawatzky, G. R. Smith, A. Smith, R. Trotta, C. Yero, X. Zheng, J. Zhou
We report new pion electroproduction measurements in the $Delta(1232)$ resonance, utilizing the SHMS - HMS magnetic spectrometers of Hall C at Jefferson Lab. The data focus on a region that exhibits a strong and rapidly changing interplay of the mesonic cloud and quark-gluon dynamics in the nucleon. The results are in reasonable agreement with models that employ pion cloud effects and chiral effective field theory calculations, but at the same time they suggest that an improvement is required to the theoretical calculations and provide valuable input that will allow their refinements. The data illustrate the potential of the magnetic spectrometers setup in Hall C towards the study the $Delta(1232)$ resonance. These first reported results will be followed by a series of measurements in Hall C, that will expand the studies of the $Delta(1232)$ resonance offering a high precision insight within a wide kinematic range from low to high momentum transfers.
{"title":"Pion electroproduction measurements in the nucleon resonance region","authors":"R. Li, N. Sparveris, H. Atac, M. K. Jones, M. Paolone, Z. Akbar, M. Ali, C. Ayerbe Gayoso, V. Berdnikov, D. Biswas, M. Boer, A. Camsonne, J. -P. Chen, M. Diefenthaler, B. Duran, D. Dutta, D. Gaskell, O. Hansen, F. Hauenstein, N. Heinrich, W. Henry, T. Horn, G. M. Huber, S. Jia, S. Joosten, A. Karki, S. J. D. Kay, V. Kumar, X. Li, W. B. Li, A. H. Liyanage, D. Mack, S. Malace, P. Markowitz, M. McCaughan, Z. -E. Meziani, H. Mkrtchyan, C. Morean, M. Muhoza, A. Narayan, B. Pasquini, M. Rehfuss, B. Sawatzky, G. R. Smith, A. Smith, R. Trotta, C. Yero, X. Zheng, J. Zhou","doi":"arxiv-2409.03750","DOIUrl":"https://doi.org/arxiv-2409.03750","url":null,"abstract":"We report new pion electroproduction measurements in the $Delta(1232)$\u0000resonance, utilizing the SHMS - HMS magnetic spectrometers of Hall C at\u0000Jefferson Lab. The data focus on a region that exhibits a strong and rapidly\u0000changing interplay of the mesonic cloud and quark-gluon dynamics in the\u0000nucleon. The results are in reasonable agreement with models that employ pion\u0000cloud effects and chiral effective field theory calculations, but at the same\u0000time they suggest that an improvement is required to the theoretical\u0000calculations and provide valuable input that will allow their refinements. The\u0000data illustrate the potential of the magnetic spectrometers setup in Hall C\u0000towards the study the $Delta(1232)$ resonance. These first reported results\u0000will be followed by a series of measurements in Hall C, that will expand the\u0000studies of the $Delta(1232)$ resonance offering a high precision insight\u0000within a wide kinematic range from low to high momentum transfers.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Converged results for E2 observables are notoriously challenging to obtain in ab initio no-core configuration interaction (NCCI) approaches. Matrix elements of the E2 operator are sensitive to the large-distance tails of the nuclear wave function, which converge slowly in an oscillator basis expansion. Similar convergence challenges beset ab initio prediction of the nuclear charge radius. However, we exploit systematic correlations between the calculated E2 and radius observables to yield meaningful predictions for relations among these observables. In particular, we examine ab initio predictions for dimensionless ratios of the form Q/r^2, for nuclei throughout the $p$ shell. Meaningful predictions for electric quadrupole moments may then be made by calibrating to the ground-state charge radius, if experimentally known, or vice versa. Moreover, these dimensionless ratios provide ab initio insight into the nuclear quadrupole deformation.
在最初的无核构型相互作用（NCCI）方法中，要获得 E2 观测值的收敛结果是众所周知的难题。E2 算子的矩阵元素对核波函数的大距离尾部很敏感，而尾部在振荡器基扩展中收敛得很慢。然而，我们利用计算出的 E2 和半径观测值之间的系统相关性，对这些观测值之间的关系进行了有意义的预测。特别是，我们研究了整个 p$ 核壳中 Q/r^2 形式的无量纲比率的 ab initio 预测。此外，这些无量纲比还提供了对核四极极变形的非初始洞察力。
{"title":"Robust ab initio predictions for dimensionless ratios of E2 and radius observables. I. Electric quadrupole moments and deformation","authors":"Mark A. Caprio, Pieter Maris","doi":"arxiv-2409.03926","DOIUrl":"https://doi.org/arxiv-2409.03926","url":null,"abstract":"Converged results for E2 observables are notoriously challenging to obtain in\u0000ab initio no-core configuration interaction (NCCI) approaches. Matrix elements\u0000of the E2 operator are sensitive to the large-distance tails of the nuclear\u0000wave function, which converge slowly in an oscillator basis expansion. Similar\u0000convergence challenges beset ab initio prediction of the nuclear charge radius.\u0000However, we exploit systematic correlations between the calculated E2 and\u0000radius observables to yield meaningful predictions for relations among these\u0000observables. In particular, we examine ab initio predictions for dimensionless\u0000ratios of the form Q/r^2, for nuclei throughout the $p$ shell. Meaningful\u0000predictions for electric quadrupole moments may then be made by calibrating to\u0000the ground-state charge radius, if experimentally known, or vice versa.\u0000Moreover, these dimensionless ratios provide ab initio insight into the nuclear\u0000quadrupole deformation.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142206541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fluctuations between charged and neutral kaons measured by the ALICE Collaboration in Pb-Pb collisions at the LHC exceed conventional explanations. Previously it was shown that if the scalar condensate is accompanied by an electrically neutral isospin--1 field then the combination can produce large equilibrium fluctuations where $langle bar{u}urangle ne langle bar{d}drangle$. Hadronizing strange and anti-strange quarks might then strongly fluctuate between charged ($ubar{s}$ or $sbar{u}$) and neutral ($dbar{s}$ or $sbar{d}$) kaons. Here we estimate the times for the condensates to achieve their equilibrium probability distributions within causal volumes in high energy heavy ion collisions. This is achieved by modeling the temperature dependence of the condensates, mesonic collective excitations, decay rates of the associated fields, and employing the Langevin and Fokker-Planck equations. We find that the equilibration times are short compared with the expansion time, and therefore disoriented isospin condensates are a viable explanation for the anomalous fluctuations observed at the LHC.
以前的研究表明，如果标量凝聚态伴随着一个中性等空素-1场，那么两者的结合就会产生很大的平衡波动，其中$langle bar{u}urangle ne langlebar{d}drangle$ 。然后，强子化奇异夸克和反奇异夸克可能会在带电（$ubar{s}$ 或 $sbar{u}$）和中性（$dbar{s}$ 或 $sbar{d}$）高子之间强烈波动。在这里，我们估算了在高能重离子碰撞中，这些凝聚态在因果体积内达到平衡概率分布的时间。这是通过模拟凝聚态的温度依赖性、介子集体猝发、相关场的衰变率以及使用朗格文和福克-普朗克方程来实现的。我们发现，与膨胀时间相比，平衡时间是短的，因此失向等空凝聚态是在大型强子对撞机上观测到的异常波动的一个可行解释。
{"title":"Relaxation times for disoriented isospin condensates in high energy heavy ion collisions","authors":"Olivia Chabowski, Joseph I. Kapusta, Mayank Singh","doi":"arxiv-2409.03711","DOIUrl":"https://doi.org/arxiv-2409.03711","url":null,"abstract":"Fluctuations between charged and neutral kaons measured by the ALICE\u0000Collaboration in Pb-Pb collisions at the LHC exceed conventional explanations.\u0000Previously it was shown that if the scalar condensate is accompanied by an\u0000electrically neutral isospin--1 field then the combination can produce large\u0000equilibrium fluctuations where $langle bar{u}urangle ne langle\u0000bar{d}drangle$. Hadronizing strange and anti-strange quarks might then\u0000strongly fluctuate between charged ($ubar{s}$ or $sbar{u}$) and neutral\u0000($dbar{s}$ or $sbar{d}$) kaons. Here we estimate the times for the\u0000condensates to achieve their equilibrium probability distributions within\u0000causal volumes in high energy heavy ion collisions. This is achieved by\u0000modeling the temperature dependence of the condensates, mesonic collective\u0000excitations, decay rates of the associated fields, and employing the Langevin\u0000and Fokker-Planck equations. We find that the equilibration times are short\u0000compared with the expansion time, and therefore disoriented isospin condensates\u0000are a viable explanation for the anomalous fluctuations observed at the LHC.","PeriodicalId":501573,"journal":{"name":"arXiv - PHYS - Nuclear Theory","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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