Pub Date : 2024-09-09DOI: 10.1103/physrevc.110.035803
E. C. Vyfers, V. Pesudo, S. Triambak, M. Kamil, P. Adsley, B. A. Brown, H. Jivan, D. J. Marin-Lambarri, R. Neveling, J. C. Nzobadila Ondze, P. Papka, L. Pellegri, B. M. Rebeiro, B. Singh, F. D. Smit, G. F. Steyn
Background: The nucleosynthesis of several proton-rich nuclei is determined by radiative proton-capture reactions on unstable nuclei in nova explosions. One such reaction is , which links the NeNa and MgAl cycles in oxygen-neon novae.
{"title":"Proton-unbound states in Al24 relevant for the Mg23(p,γ) reaction in novae","authors":"E. C. Vyfers, V. Pesudo, S. Triambak, M. Kamil, P. Adsley, B. A. Brown, H. Jivan, D. J. Marin-Lambarri, R. Neveling, J. C. Nzobadila Ondze, P. Papka, L. Pellegri, B. M. Rebeiro, B. Singh, F. D. Smit, G. F. Steyn","doi":"10.1103/physrevc.110.035803","DOIUrl":"https://doi.org/10.1103/physrevc.110.035803","url":null,"abstract":"<b>Background:</b> The nucleosynthesis of several proton-rich nuclei is determined by radiative proton-capture reactions on unstable nuclei in nova explosions. One such reaction is <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mmultiscripts><mi>Mg</mi><mprescripts></mprescripts><none></none><mn>23</mn></mmultiscripts><mo>(</mo><mi>p</mi><mo>,</mo><mi>γ</mi><mo>)</mo><mmultiscripts><mi>Al</mi><mprescripts></mprescripts><none></none><mn>24</mn></mmultiscripts></mrow></math>, which links the NeNa and MgAl cycles in oxygen-neon novae.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-09DOI: 10.1103/physrevc.110.034606
Ying Wang, Fu-Quan Dou
Nuclear coherent population transfer (NCPT) plays an important role in the exploration and application of atomic nuclei. How to achieve high-fidelity NCPT remains so far challenging. Here, we investigate the complete population transfer of nuclear states. We first consider a cyclic three-level system, based on the mixed-state inverse engineering scheme by adding additional laser fields in an open three-level nuclear system with spontaneous emission. We find the amplitude of the additional field is related to the ratio of the pump and Stokes field amplitudes. As long as an appropriate additional field is selected, complete transfer can be achieved even when the intensities of the pump and Stokes fields are exceedingly low. The transfer efficiency exhibits excellent robustness with respect to laser peak intensity and pulse delay. We demonstrate the effectiveness through examples such as , and , which have a long lifetime excited state, as well as , and with a short lifetime excited state. Focusing on the case without additional coupling, we further reduce the three-level system to an effective two-level problem. We modify the pump and Stokes pulses by using counterdiabatic driving to implement high-fidelity population transfer. The schemes open up new possibilities for controlling nuclear states.
{"title":"High-fidelity nuclear coherent population transfer via mixed-state inverse engineering","authors":"Ying Wang, Fu-Quan Dou","doi":"10.1103/physrevc.110.034606","DOIUrl":"https://doi.org/10.1103/physrevc.110.034606","url":null,"abstract":"Nuclear coherent population transfer (NCPT) plays an important role in the exploration and application of atomic nuclei. How to achieve high-fidelity NCPT remains so far challenging. Here, we investigate the complete population transfer of nuclear states. We first consider a cyclic three-level system, based on the mixed-state inverse engineering scheme by adding additional laser fields in an open three-level nuclear system with spontaneous emission. We find the amplitude of the additional field is related to the ratio of the pump and Stokes field amplitudes. As long as an appropriate additional field is selected, complete transfer can be achieved even when the intensities of the pump and Stokes fields are exceedingly low. The transfer efficiency exhibits excellent robustness with respect to laser peak intensity and pulse delay. We demonstrate the effectiveness through examples such as <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Th</mi><mprescripts></mprescripts><none></none><mn>229</mn></mmultiscripts><mo>,</mo><mo> </mo><mmultiscripts><mi>Ra</mi><mprescripts></mprescripts><none></none><mn>223</mn></mmultiscripts><mo>,</mo><mo> </mo><mmultiscripts><mi>Cd</mi><mprescripts></mprescripts><none></none><mn>113</mn></mmultiscripts></math>, and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Tc</mi><mprescripts></mprescripts><none></none><mn>97</mn></mmultiscripts></math>, which have a long lifetime excited state, as well as <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Re</mi><mprescripts></mprescripts><none></none><mn>187</mn></mmultiscripts><mo>,</mo><mo> </mo><mmultiscripts><mi>Yb</mi><mprescripts></mprescripts><none></none><mn>172</mn></mmultiscripts><mo>,</mo><mo> </mo><mmultiscripts><mi>Er</mi><mprescripts></mprescripts><none></none><mn>168</mn></mmultiscripts></math>, and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Gd</mi><mprescripts></mprescripts><none></none><mn>154</mn></mmultiscripts></math> with a short lifetime excited state. Focusing on the case without additional coupling, we further reduce the three-level system to an effective two-level problem. We modify the pump and Stokes pulses by using counterdiabatic driving to implement high-fidelity population transfer. The schemes open up new possibilities for controlling nuclear states.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-09DOI: 10.1103/physrevc.110.034605
R. B. Baker, Ch. Elster, T. Dytrych, K. D. Launey
Background: Calculating microscopic optical potentials for elastic scattering at intermediate energies from light nuclei in an ab initio fashion within the Watson expansion has been established within the last few years.
{"title":"Ab initio leading order effective potential for elastic proton scattering based on the symmetry-adapted no-core shell model","authors":"R. B. Baker, Ch. Elster, T. Dytrych, K. D. Launey","doi":"10.1103/physrevc.110.034605","DOIUrl":"https://doi.org/10.1103/physrevc.110.034605","url":null,"abstract":"<b>Background:</b> Calculating microscopic optical potentials for elastic scattering at intermediate energies from light nuclei in an <i>ab initio</i> fashion within the Watson expansion has been established within the last few years.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-09DOI: 10.1103/physrevc.110.034607
K. Pomorski, B. Nerlo-Pomorska, J. Bartel, C. Schmitt, Z. G. Xiao, Y. J. Chen, L. L. Liu
Spontaneous fission of and fusion-induced fission of are investigated within a multidimensional Langevin model. The potential-energy surface is calculated in the macroscopic-microscopic Lublin-Strasbourg drop (LSD) Yukawa-folded approach using the four-dimensional (4D) Fourier-over-spheroid shape parametrization. The dynamical evolution described by the Langevin equation is coupled to neutron evaporation, thereby allowing for the possibility of multichance fission. Charge equilibration and excitation-energy sharing between the fragments emerging at scission are evaluated, and their deexcitation is finally computed. The correlation between various observables, particularly the isotopic properties of the fragments, is discussed and compared with the experiment whenever available. The theoretical predictions are generally in good agreement with the data.
{"title":"Toward a unified description of isotopic fragment properties in spontaneous and fusion-induced fission within a 4D dynamical Langevin model","authors":"K. Pomorski, B. Nerlo-Pomorska, J. Bartel, C. Schmitt, Z. G. Xiao, Y. J. Chen, L. L. Liu","doi":"10.1103/physrevc.110.034607","DOIUrl":"https://doi.org/10.1103/physrevc.110.034607","url":null,"abstract":"Spontaneous fission of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Cf</mi><mprescripts></mprescripts><none></none><mn>252</mn></mmultiscripts></math> and fusion-induced fission of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi>Cf</mi><mprescripts></mprescripts><none></none><mn>250</mn></mmultiscripts></math> are investigated within a multidimensional Langevin model. The potential-energy surface is calculated in the macroscopic-microscopic Lublin-Strasbourg drop (LSD) <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mo>+</mo></math> Yukawa-folded approach using the four-dimensional (4D) Fourier-over-spheroid shape parametrization. The dynamical evolution described by the Langevin equation is coupled to neutron evaporation, thereby allowing for the possibility of multichance fission. Charge equilibration and excitation-energy sharing between the fragments emerging at scission are evaluated, and their deexcitation is finally computed. The correlation between various observables, particularly the isotopic properties of the fragments, is discussed and compared with the experiment whenever available. The theoretical predictions are generally in good agreement with the data.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-09DOI: 10.1103/physrevc.110.034306
Ik Jae Shin, Nadezda A. Smirnova, Andrey M. Shirokov, Zuxing Yang, Bruce R. Barrett, Zhen Li, Youngman Kim, Pieter Maris, James P. Vary
We present new microscopic effective shell-model interactions in the valence shell, obtained from the modern Daejeon16 nucleon-nucleon potential using no-core shell-model (NCSM) wave functions of at (total oscillator quanta of excitation) model space and the Okubo-Lee-Suzuki transformation. First, we explore the convergence properties of our calculations and show that the excitation energies of states in , characterized by the largest valence-like configurations, are reasonably converged and the lowest states are in sensible agreement with experiment. Then, we investigate the monopole properties of that interaction in comparison with the phenomenological universal -shell interaction, USDB, and with the previously derived interaction at . Theoretical binding energies and low-energy spectra of the O isotopes, as well as low-energy spectra of a selection of -shell nuclei, are presented. We conclude that the use of larger-space NCSM wave functions leads to a noticeable improvement in the quality of the derived effective interaction. We propose monopole modifications of the Daejeon16 centroids which further improve the agreement with experiment throughout the shell, as demonstrated by a compilation of spectra contained in Supplemental Material.
{"title":"Improving the sd-shell effective interaction obtained from the Daejeon16 nucleon-nucleon interaction","authors":"Ik Jae Shin, Nadezda A. Smirnova, Andrey M. Shirokov, Zuxing Yang, Bruce R. Barrett, Zhen Li, Youngman Kim, Pieter Maris, James P. Vary","doi":"10.1103/physrevc.110.034306","DOIUrl":"https://doi.org/10.1103/physrevc.110.034306","url":null,"abstract":"We present new microscopic effective shell-model interactions in the valence <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>s</mi><mi>d</mi></mrow></math> shell, obtained from the modern Daejeon16 nucleon-nucleon potential using no-core shell-model (NCSM) wave functions of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">F</mi><mprescripts></mprescripts><none></none><mn>18</mn></mmultiscripts></math> at <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>N</mi><mi>max</mi></msub><mo>=</mo><mn>6</mn></mrow></math> (total oscillator quanta of excitation) model space and the Okubo-Lee-Suzuki transformation. First, we explore the convergence properties of our calculations and show that the excitation energies of states in <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">F</mi><mprescripts></mprescripts><none></none><mn>18</mn></mmultiscripts></math>, characterized by the largest valence-like configurations, are reasonably converged and the lowest states are in sensible agreement with experiment. Then, we investigate the monopole properties of that interaction in comparison with the phenomenological universal <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>s</mi><mi>d</mi></mrow></math>-shell interaction, USDB, and with the previously derived interaction at <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><msub><mi>N</mi><mi>max</mi></msub><mo>=</mo><mn>4</mn></mrow></math>. Theoretical binding energies and low-energy spectra of the O isotopes, as well as low-energy spectra of a selection of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>s</mi><mi>d</mi></mrow></math>-shell nuclei, are presented. We conclude that the use of larger-space NCSM wave functions leads to a noticeable improvement in the quality of the derived effective interaction. We propose monopole modifications of the Daejeon16 centroids which further improve the agreement with experiment throughout the <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mi>s</mi><mi>d</mi></mrow></math> shell, as demonstrated by a compilation of spectra contained in Supplemental Material.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-06DOI: 10.1103/physrevc.110.034904
W. Rzesa, G. Kornakov, A. R. Kisiel, Yu. M. Sinyukov, V. M. Shapoval
Femtoscopy studies of pion radiation in heavy-ion collisions have been conducted extensively at all available collider energies, both theoretically and experimentally. In all these studies special attention is given to dependency of pion femtoscopy radii, usually approximated by a power-law function at transverse momenta above . However, the radii behavior has been much less explored for the ultrasoft pions, possessing transverse momentum comparable to or lower than the pion mass. For many experimental setups this region is difficult to measure. In this work we present theoretical calculations of pion emission in the ultrasoft region in the two hybrid models iHKM and . Along with the particle transverse momentum spectra, we present the calculated femtoscopy radii, in both one-dimensional and three-dimensional representations. We investigate the radii dependence on pair and observe, in particular, a departure from the power-law behavior at ultrasoft momenta, potentially reflecting a decoupling of such slow pions from the rest of collectively expanding system. We provide the theoretical interpretation of this result and discuss its significance, in particular, for the ongoing nonidentical particle femtoscopy analysis for pairs consisting of a pion and a baryon (or of a pion and a charmed meson).
{"title":"Femtoscopy analysis of ultrasoft pion trap at energies available at the CERN Large Hadron Collider","authors":"W. Rzesa, G. Kornakov, A. R. Kisiel, Yu. M. Sinyukov, V. M. Shapoval","doi":"10.1103/physrevc.110.034904","DOIUrl":"https://doi.org/10.1103/physrevc.110.034904","url":null,"abstract":"Femtoscopy studies of pion radiation in heavy-ion collisions have been conducted extensively at all available collider energies, both theoretically and experimentally. In all these studies special attention is given to <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>m</mi><mi>T</mi></msub></math> dependency of pion femtoscopy radii, usually approximated by a power-law function at transverse momenta above <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mn>200</mn><mspace width=\"4pt\"></mspace><mi>MeV</mi><mo>/</mo><mi>c</mi></mrow></math>. However, the radii behavior has been much less explored for the ultrasoft pions, possessing transverse momentum comparable to or lower than the pion mass. For many experimental setups this region is difficult to measure. In this work we present theoretical calculations of pion emission in the ultrasoft region in the two hybrid models iHKM and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mtext>LHYQUID</mtext><mo>+</mo><mi mathvariant=\"normal\">th</mi><mtext>ERMINATOR2</mtext></math>. Along with the particle transverse momentum spectra, we present the calculated femtoscopy radii, in both one-dimensional and three-dimensional representations. We investigate the radii dependence on pair <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub><mi>m</mi><mi>T</mi></msub></math> and observe, in particular, a departure from the power-law behavior at ultrasoft momenta, potentially reflecting a decoupling of such slow pions from the rest of collectively expanding system. We provide the theoretical interpretation of this result and discuss its significance, in particular, for the ongoing nonidentical particle femtoscopy analysis for pairs consisting of a pion and a baryon (or of a pion and a charmed meson).","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-06DOI: 10.1103/physrevc.110.035501
M. Cadeddu, N. Cargioli, J. Erler, M. Gorchtein, J. Piekarewicz, Xavier Roca-Maza, H. Spiesberger
We study the impact of nuclear structure uncertainties on a measurement of the weak charge of at the future Mainz Energy Recovering Superconducting Accelerator (MESA) facility in Mainz. Information from a large variety of nuclear models, accurately calibrated to the ground-state properties of selected nuclei, suggest that a 0.3% precision measurement of the parity-violating asymmetry at forward angles will not be compromised by nuclear structure effects, thereby allowing a world-leading determination of the weak charge of . Furthermore, we show that a combination of measurements of the parity-violating asymmetry at forward and backward angles for the same electron-beam energy can be used to extract information on the nuclear weak charge distribution. We conclude that a 0.34% precision on the weak radius of may be achieved by performing a 3% precision measurement of the parity-violating asymmetry at backward angles.
{"title":"Simultaneous extraction of the weak radius and the weak mixing angle from parity-violating electron scattering on C12","authors":"M. Cadeddu, N. Cargioli, J. Erler, M. Gorchtein, J. Piekarewicz, Xavier Roca-Maza, H. Spiesberger","doi":"10.1103/physrevc.110.035501","DOIUrl":"https://doi.org/10.1103/physrevc.110.035501","url":null,"abstract":"We study the impact of nuclear structure uncertainties on a measurement of the weak charge of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">C</mi><mprescripts></mprescripts><none></none><mn>12</mn></mmultiscripts></math> at the future Mainz Energy Recovering Superconducting Accelerator (MESA) facility in Mainz. Information from a large variety of nuclear models, accurately calibrated to the ground-state properties of selected nuclei, suggest that a 0.3% precision measurement of the parity-violating asymmetry at forward angles will not be compromised by nuclear structure effects, thereby allowing a world-leading determination of the weak charge of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">C</mi><mprescripts></mprescripts><none></none><mn>12</mn></mmultiscripts></math>. Furthermore, we show that a combination of measurements of the parity-violating asymmetry at forward and backward angles for the same electron-beam energy can be used to extract information on the nuclear weak charge distribution. We conclude that a 0.34% precision on the weak radius of <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mmultiscripts><mi mathvariant=\"normal\">C</mi><mprescripts></mprescripts><none></none><mn>12</mn></mmultiscripts></math> may be achieved by performing a 3% precision measurement of the parity-violating asymmetry at backward angles.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-06DOI: 10.1103/physrevc.110.034002
Elena Filandri, Michele Viviani
We study dark matter, assumed to be composed of weak interacting massive particles (WIMPs), scattering off and nuclei. In order to parametrize the WIMP-nucleon interaction, the chiral effective field theory approach is used. Considering only interactions invariant under parity, charge conjugation, and time reversal, we examine five interaction types: scalar, pseudoscalar, vector, axial, and tensor. Scattering amplitudes between two nucleons and a WIMP are determined up to second order of chiral perturbation theory. We apply this program to calculate the interaction rate as a function of the WIMP mass and of the magnitude of the WIMP-quark coupling constants. From our study, we conclude that the scalar nuclear response functions is much greater than the others due to their large combination of low energy constants. We verify that the leading order contributions are dominant in these low energy processes. We also provide an estimate for the background due to atmospheric neutrinos.
{"title":"Dark matter scattering off H2 and He4 nuclei within chiral effective field theory","authors":"Elena Filandri, Michele Viviani","doi":"10.1103/physrevc.110.034002","DOIUrl":"https://doi.org/10.1103/physrevc.110.034002","url":null,"abstract":"We study dark matter, assumed to be composed of weak interacting massive particles (WIMPs), scattering off <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mrow></mrow><mmultiscripts><mi mathvariant=\"normal\">H</mi><mprescripts></mprescripts><none></none><mn>2</mn></mmultiscripts></mrow></math> and <math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow><mrow></mrow><mmultiscripts><mi>He</mi><mprescripts></mprescripts><none></none><mn>4</mn></mmultiscripts></mrow></math> nuclei. In order to parametrize the WIMP-nucleon interaction, the chiral effective field theory approach is used. Considering only interactions invariant under parity, charge conjugation, and time reversal, we examine five interaction types: scalar, pseudoscalar, vector, axial, and tensor. Scattering amplitudes between two nucleons and a WIMP are determined up to second order of chiral perturbation theory. We apply this program to calculate the interaction rate as a function of the WIMP mass and of the magnitude of the WIMP-quark coupling constants. From our study, we conclude that the scalar nuclear response functions is much greater than the others due to their large combination of low energy constants. We verify that the leading order contributions are dominant in these low energy processes. We also provide an estimate for the background due to atmospheric neutrinos.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-06DOI: 10.1103/physrevc.110.034604
G. Mohanto, M. T. Senthil Kannan, Jhilam Sadhukhan, B. Srinivasan
Background: In the theoretical analysis of nuclear fission observables, dissipation strength is often adjusted locally to reproduce the experimental data. The global trend of the dissipation strength over the whole mass range of fissioning nuclei is still not known convincingly. Also, its connection with fission timescales is essential to understand the reaction dynamics.
{"title":"Inferring fission timescales from prescission neutron multiplicity using a Langevin dynamical model","authors":"G. Mohanto, M. T. Senthil Kannan, Jhilam Sadhukhan, B. Srinivasan","doi":"10.1103/physrevc.110.034604","DOIUrl":"https://doi.org/10.1103/physrevc.110.034604","url":null,"abstract":"<b>Background:</b> In the theoretical analysis of nuclear fission observables, dissipation strength is often adjusted locally to reproduce the experimental data. The global trend of the dissipation strength over the whole mass range of fissioning nuclei is still not known convincingly. Also, its connection with fission timescales is essential to understand the reaction dynamics.","PeriodicalId":20122,"journal":{"name":"Physical Review C","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-05DOI: 10.1103/physrevc.110.034602
A. J. Smith, C. Hebborn, F. M. Nunes, R. G. T. Zegers
Charge-exchange reactions are versatile probes for nuclear structure. In particular, when populating isobaric analog states, these reactions are used to study isovector nuclear densities and neutron skins. The quality of the information extracted from charge-exchange data depends on the accuracy of the reaction models and their inputs; this work addresses these two points. First, we quantify the uncertainties due to effective nucleon-nucleus interactions by propagating the parameter posterior distributions of the recent global optical model KDUQ [C. D. Pruitt, J. E. Escher, and R. Rahman, Phys. Rev. C107, 014602 (2023)] to reaction observables populating the isobaric analog state, at beam energies in the range of 25–160 MeV. Our analysis, focusing on , shows that the total parametric uncertainties on the cross sections are around 60–100%. The source of this uncertainty is mainly the transition operator as the uncertainties from the distorted waves alone are less than about 15%. Second, we perform a comparison between two- and three-body models that both describe the dynamics of the reaction within the DWBA. The predictions from these two models are similar and generally agree with the available data, suggesting that one-step DWBA is sufficient to describe the reaction process. Only at a beam energy of 25 MeV are there possible signs that a one-step assumption is not fully correct. This work provides motivation for the quantification of uncertainties associated with the transition operator in three-body model. It also suggests that further constraint of the optical potential parameters is needed for increased model precision.
电荷交换反应是核结构的多功能探针。特别是在填充等压类似态时，这些反应可用于研究等向核密度和中子皮。从电荷交换数据中提取的信息的质量取决于反应模型及其输入的准确性；这项工作涉及这两点。首先，我们通过传播近期全球光学模型 KDUQ [C. D. Pruitt, J. E. Escher, and R. Rahman, Phys. Rev. C 107, 014602 (2023)]的参数后验分布，量化了有效核子-核相互作用引起的不确定性，并在 25-160 兆电子伏特的光束能量范围内，将（p,n）反应观测值填充到等压模拟态。我们以 Ca48 为重点进行的分析表明，横截面的总参数不确定性约为 60-100%。这种不确定性的来源主要是转换算子，因为仅来自扭曲波的不确定性就小于约 15%。其次，我们对描述 DWBA 内反应动力学的二体和三体模型进行了比较。这两种模型的预测结果相似，与现有数据基本吻合，表明一步 DWBA 足以描述反应过程。只有在束流能量为 25 MeV 时，才可能出现单步假设不完全正确的迹象。这项工作为量化与三体模型中转变算子相关的不确定性提供了动力。它还表明，要提高模型的精确度，还需要进一步限制光学势参数。
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