Description
P1
In nuclear astrophysics, the nuclear reactions of the stellar evolution occur within the Gamow window which lies much below the Coulomb barrier. The cross-sections of these reactions are very less around nb-pb order, thereby making these measurements very difficult [1]. In such measurements, the low yields of measured ϒ-ray lead to insufficient statistics and hence increase uncertainty in the...
The total angular momentum of resonance is one of the significant parameters in nuclear data, but the identification is difficult. The parameter has been determined by several methods: the measurement of the spin-dependent transmission ratio by polarized neutrons and a polarized target [1], the measurement of intensity ratio of cascade $\gamma$-rays emitted from neutron resonance captures [2],...
Nucleosynthesis of heavier nuclei (Z $>$ 26) generally occurs through s or r-process. However, certain neutron deficient nuclei in stars are produced neither by r or s-process. They are produced by ($\gamma,\alpha$), ($\gamma$,p), and ($\gamma$,n) reactions and are known as p-nuclei. Due to the better availability of ion beams over $\gamma$-beams, the inverse reaction cross-sections on...
The detection of environmental radiation is of great importance and efficient, compact, and cost-effective instruments are highly needed. One of the potentially suitable detection tools for the detection of gamma radiation is the Compton gamma camera (CGC), which, in contrast to gamma cameras with mechanical collimations, uses electronic collimation based on the kinematics of the Compton...
N,Z ~ 28 is the first shell gap originated due to the inclusion of spin - orbit (l.s) coupling term in the nuclear Hamiltonian. The lowering of 1f$_{7/2}$ orbital from other fp space creates this shell gap though small excitation energy can excite nucleons from 1f$_{7/2}$ orbital to upper fp orbitals and also to 1g$_{9/2}$ orbital (depending upon the deformation of the system). The nuclei near...
One of the primary aims of experimental nuclear astrophysics is to determine the rates of nuclear reactions taking place in stars under various astrophysical conditions. The reaction rates are determined from the cross sections, which need to be measured at energies as close as possible to the astrophysically relevant ones (near the Gamow window). In many cases, the final nucleus of an...
Measurement of lifetime of nuclear excited states and determination of electromagnetic transition strengths from that provides direct insight into nuclear structure. The measurement of lifetime in $\gamma-\gamma$ electronic coincidence method depends on the time resolution and energy resolution of the detector system. The ideal $\gamma$-ray spectroscopy requires a combination of excellent...
Isomeric studies are crucial for understanding the fundamental nuclear structure as well as for practical applications. Because nuclear isomers are known to exist throughout the nuclear landscape, it is interesting to depict their global features and, if any, systematics. This resulted in the first compilation of (more than) 2400 isomers in 2015, with a lower limit on the half-life of 10...
Quantum shape phase transitions and shape coexistence in finite many body quantum systems, such as nuclei, are of contemporary interest [1]. The phenomenon of rapid shape changes as a function of nucleon number has been observed in the rare-earth region around N = 90. The N = 90 nuclei in Sm-Gd region are well known for the observation of quantum shape phase transition from spherical to well...
In this work we study the effects of the octupole degrees of freedom in the nuclear structure of the even-even radium isotopic chain, obtaining the energy spectra and electromagnetic transition rates between states of different parity, comparing our calculations with the experimental data currently available. The analysis of the effects produced by the octupole degrees of freedom in radium...
The total angular momentum, J, of resonances is one of the important parameters to represent cross sections in low-energy nuclear reactions. Several methods have been proposed to estimate J of resonances from experiments [1]. One of the attractive methods was to compare the intensity ratios of appropriately chosen pairs of low-energy transitions in the gamma-ray spectrum of a resonance...
Due to fast progress in Radioactive Ion Beam programs, the study of neutron-proton (n-p) pairing effects has known a renewal of interest during the last decade (cf. e.g. [1-3]).
N-p pairing effects may exist in two forms: the isovector (T=1) and the isoscalar (T=0) pairing, where T is the isospin quantum number.
On the other hand, the study of the temperature effect on pairing correlations at...
The shape of nuclei is determined by a fine balance between the stabilizing effect of closed shells and the pairing and quadrupole force that tends to make them deformed. As other well known cases, located in the A = 100 mass region, as Yb, Zr or Nb for example, Sr isotopes [1] are good candidates to study the existence of this nuclear deformation, while Ru and Mo [2] isotopes are interesting...
Over the past several decades, the spectroscopy of atomic nuclei provided invaluable information towards our current understanding of nature at the most fundamental level. More recent state-of-the-art experiments have placed critical bounds on beyond the standard model (BSM) physics, while also offering important benchmarks for related theoretical calculations.
This work presents recent...
Up-to-date recommended nuclear data are key to new and successful developments in basic research and applications. In this paper we present international efforts to collect and assess available experimental data with the goal to provide recommended data. We discuss trends observed through systematic comparisons of the data and present online databases with versatile retrieval interfaces and...
The rotational band based on the scissors mode is investigated by an angular-momentum-projected method, which introduces the scissors degree of freedom by projecting protons and neutrons independently. An odd-even splitting of the rotational energy is found as a characteristic feature of these bands, which can be amplified by mixing with K=1 two-quasiparticle excitations. The odd-even...
The p process nucleosynthesis is responsible for the creation of around 35 low-abundant nuclides which lie in the neutron-deficient side of the isotopic chart [1]. The modeling of the p process consists of around 20,000 reactions involving around 2,000 nuclides, including photodisintegration reactions such as (γ,p), (γ,a) and (γ,n). Their inverse reactions, related by the reciprocity theorem,...
The stable neutron deficient nuclei with mass number of 74<A<196 (nearly 30-35 nuclei) not produced via the s- or r- process are known as p-nuclei. Their isotopic abundances are considerably lower than the other stable isotopes of the same element. Generally accepted that s- or r- isotopes are serves as seed nuclei for the p-nuclei production.
In the stellar explosive site, the series...
A quantum simulation of the Agassi model from nuclear physics is proposed so as to be implemented within a trapped-ion quantum platform [1]. Numerical simulations and analytical estimations illustrate the feasibility of this simple proposal with current technology, while our approach is fully scalable to a larger number of sites. The use of a quantum correlation function is studied as a...
Determination of the true feeding intensities (Iβ ) in β -decay of fission products is very important in addressing the reactor antineutrino anomaly and modeling the reactor decay heat. β -decay mea- surements with high-resolution but low-efficiency detectors may affect by the Pandemonium effect. This effect may lead to underestimation of the feeding to high excited levels, thus systematically...
