نتایج جستجو برای: rich nuclei
تعداد نتایج: 218149 فیلتر نتایج به سال:
Nuclear level densities (NLDs) are key ingredients in calculations of neutron capture rates for rich isotopes nuclear astrophysics applications. Available experimental NLDs limited mainly to nuclei near stability. Therefore, theoretical models employed predict the nuclei. Here we present a methodology calculating spin- and parity- dependent using methods statistical spectroscopy, based on Shell...
The damping of single-particle and collective motion in exotic isotopes is a new topic and its study may shed light on basic problems of nuclear dynamics. For instance, it is known that nuclear structure calculations are not able, as a rule, to account completely for the empirical single-particle damping. In this contribution, we present calculations of the single-particle self-energy in the ca...
Until relatively recently cluster studies have been confined to the region encompassing the line of beta stability. As clustering is expected to manifest itself most strongly near thresholds, exotic structures might be expected to form in the more weakly bound systems found in the vicinity of the driplines. Perhaps the most striking example of this are the halo nuclei. In the present paper two ...
The two-basis method to solve the HFB for deformed nuclei in coordinate space is examined concerning the precision of the density tail. Small cutoff energies are shown to give rise to ripples in the tail, whose wave length corresponds to the cutoff momentum. More precise solutions require higher cutoff energies, which result in HFB matrices of larger dimensions. To circumvent the difficulty of ...
We perform Hartree-Fock+BCS calculations for even-even nuclei with 2 ≤ Z ≤ 82 and N ranging from outside the proton drip line to the experimental frontier on the neutron-rich side. The ground state solutions are obtained for 737 nuclei, together with shape-coexistence solutions for 480 nuclei. Our method features the Cartesian-mesh representation of single-particle wavefunctions, which is advan...
We investigate the isoscalar and isovector E1 response of neutron-rich nuclei, within a semiclassical transport model employing effective interactions for the nuclear mean-field. In particular, we adopt the recently introduced SAMi-J Skyrme interactions, whose parameters are specifically tuned to improve the description of spin-isospin properties of nuclei. Our analysis evidences a relevant deg...
A simple model based on the group SO(5) suggests that both the likeparticle and neutron-proton components of isovector pairing correlations in odd-A nuclei are Pauli blocked. The same effect emerges from Monte Carlo Shell-model calculations of proton-rich nuclei in the full fp shell. There are small differences between the two models in their representation of the effects of an odd nucleon on t...
A new way is found to discover and examine unknown neutron-rich heavy nuclei at the ‘north-east’ part of the nuclear map. This ‘blank spot’ of the nuclear map can be reached neither in fusion–fission reactions nor in fragmentation processes widely used nowadays for the production of new nuclei. The present limits of the upper part of the nuclear map are very close to stability while the unexplo...
We propose to study the neutron-deficient (201−206Fr) and neutron-rich (218,219,229−232Fr) francium isotopes with high-resolution collinear resonance ionization spectroscopy. Extraction of the quadrupole moments will provide information on the nature of the deformation in the neutron-deficient nuclei and the octupole deformation suggested in the neutron-rich nuclei. The presence of the decay sp...
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