Temperature effects on neutron-capture cross sections and rates through electric dipole transitions in hot nuclei

Berceanu, A. C.; Xu, Y.; Niu, Y.

doi:10.1103/physrevc.104.044332

Cited by 2 publications

(5 citation statements)

References 47 publications

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“…Reference [38] has highlighted similar FT-RRPA results as one moves from 126 Sn to 146 Sn at T = 1 and 2 MeV. Table IV represents the partial contributions of particle configurations to the newly emerged low-energy E 1 peaks at E < 5 MeV in 140 Sn nucleus at T = 2 MeV.…”

Section: B Sn Isotopesmentioning

confidence: 64%

“…III A for 56 Ca, these low-energy peaks are predominantly attributed to single neutron transitions, primarily caused by thermal unblocking effects, which is consistent with the results documented in Refs. [37,38].…”

Section: B Sn Isotopesmentioning

confidence: 99%

“…Given that nuclei can also exist in extreme conditions within stellar environments, there has been a growing interest in understanding the temperature dependence of nuclear excitations. Temperature (T ) serves as an external probe capable of significantly influencing the structure and dynamics of nuclei [31][32][33][34][35][36][37][38][39]. The experimental data on the GDR at finite temperature is mainly based on the study of the decay from fusion-evaporation reactions, which allow the production of self-conjugate compound nuclei (CN) at high excitation energy [40,41].…”

Section: Introductionmentioning

confidence: 99%

“…By adopting a time-blocking technique in the Matsubara Green's function formalism, the finite-temperature relativistic time-blocking approximation (FT-RTBA) approach was formulated to study the E 1 spectra in the excited Ca and Sn isotopes [35][36][37]. In a recent study [38], the E 1 response in Sn nuclei was also investigated using the QRPA and DD-ME2 interaction with density-dependent meson-nucleon couplings at zero temperature, while finite temperature effects were analyzed using the FT-RRPA. All of these studies have revealed the emergence of new excited states, particularly in the low-energy region, attributed to the thermal unblocking effect of temperature on single-particle orbitals near the Fermi level.…”

Section: Introductionmentioning

confidence: 99%

“…However, the calculations in Refs. [35][36][37][38] were performed at high temperatures above T 1 MeV. In this temperature regime, the nucleus undergoes a pairing phase transition from superfluid to the normal state, hence pairing correlations do not play a role in the calculations.…”

Section: Introductionmentioning

confidence: 99%

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Electric dipole transitions in the relativistic quasiparticle random-phase approximation at finite temperature

Kaur,

Yüksel,

Paar

2024

Phys. Rev. C

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Finite temperature results in various effects on the properties of nuclear structure and excitations of relevance for nuclear processes in hot stellar environments. Here, we introduce the self-consistent finite temperature relativistic quasiparticle random phase approximation (FT-RQRPA) based on relativistic energy density functional with point coupling interaction for describing the temperature effects in electric dipole (E 1) transitions.We perform a study of E 1 excitations in the temperature range T = 0-2 MeV for the selected closed-and open-shell nuclei ranging from 40 Ca to 60 Ca and 100 Sn to 140 Sn by including both thermal and pairing effects. The isovector giant dipole resonance strength is slightly modified for the considered range of temperature, while new low-energy peaks emerge for E < 12 MeV with non-negligible strength in neutron-rich nuclei at high temperatures. The analysis of relevant two-quasiparticle configurations discloses how new excitation channels open due to thermal unblocking of states at finite temperature. The study also examines the isospin and temperature dependence of electric dipole polarizability (α D ), resulting in systematic increase in the values of α D with increasing temperature, with a more pronounced effect observed in neutron-rich nuclei. The FT-RQRPA introduced in this work will open perspectives for microscopic calculation of γ -ray strength functions at finite temperatures relevant for nuclear reaction studies.

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Section: B Sn Isotopesmentioning

confidence: 64%

Section: B Sn Isotopesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electric dipole transitions in the relativistic quasiparticle random-phase approximation at finite temperature

Kaur,

Yüksel,

Paar

2024

Phys. Rev. C

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Nuclear physics midterm plan at Legnaro National Laboratories (LNL)

et al. 2023

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The next years will see the completion of the radioactive ion beam facility SPES (Selective Production of Exotic Species) and the upgrade of the accelerators complex at Istituto Nazionale di Fisica Nucleare – Legnaro National Laboratories (LNL) opening up new possibilities in the fields of nuclear structure, nuclear dynamics, nuclear astrophysics, and applications. The nuclear physics community has organised a workshop to discuss the new physics opportunities that will be possible in the near future by employing state-of-the-art detection systems. A detailed discussion of the outcome from the workshop is presented in this report.

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Temperature effects on neutron-capture cross sections and rates through electric dipole transitions in hot nuclei

Cited by 2 publications

References 47 publications

Electric dipole transitions in the relativistic quasiparticle random-phase approximation at finite temperature

Electric dipole transitions in the relativistic quasiparticle random-phase approximation at finite temperature

Nuclear physics midterm plan at Legnaro National Laboratories (LNL)

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