Structure Of Neutron-rich Nuclei Research Articles

Comment on “Structure of neutron-rich nuclei around132Sn”

Recent shell model calculations using a realistic interaction by Andreozzi et al. [Phys. Rev. C 56, R16 (1997)] have given excellent agreement with the experimental level spectra of ${}^{134}\mathrm{Te}$ and ${}^{135}\mathrm{I}.$ In addition, these authors call into question our contention that there is a serious inconsistency in the measured masses of N=82 isotones near ${}^{132}\mathrm{Sn}.$ In this Comment, we outline the shell model decomposition method and defend our conclusion that the accepted ground state masses of ${}^{134}\mathrm{Te}$ and/or ${}^{133}\mathrm{Sb}$ must be inaccurate by much more than their assigned errors.

Structure of neutron-rich nuclei around 132Sn

Recent studies have provided new experimental information on neutron-rich nuclei around doubly magic {sup 132}Sn. We have performed shell-model calculations for the two- and three-proton N=82 isotones {sup 134}Te and {sup 135}I using a realistic effective interaction derived from the Bonn A nucleon-nucleon potential. The results are in remarkably good agreement with the experimental data evidencing the reliability of our realistic effective interaction. {copyright} {ital 1997} {ital The American Physical Society}

Physics with REX-ISOLDE and MINIBALL

REX-ISOLDEis an experiment atISOLDE/CERN with the aim to study the nuclear structure of neutron-rich nuclei using radioactive ion beams up to 2.2 MeV/u. The highly-efficient γ-ray detector set-up MINIBALL will be used to explore reactions induced by Coulomb excitation or neutron transfer.

Structure of neutron-rich nuclei and neutron multiplicities in spontaneous fission

New insights into the fission process and the structure of neutron-rich nuclei have been gained by measuring γ-γ and γ-γ-γ coincidences of the prompt γ-rays following the spontaneous fission of 252Cf. The data were taken with the Compton Suppression Spectrometer System at HHIRF. New high spin levels were observed in 143,145,147Ba Only in 143Ba are intertwined bands observed with the characteristics of the octupole structure found only in 144Ba. New high spin states observed in the N = 84 136Te, 138Xe, 140Ba nuclei exhibit a symmetry pattern suggestive of a pseudospin f ̃ - shell . For the first time in fission, the relative yields and neutron multiplicities were measured directly. Yields and multiplicities were measured directly for the ZrCe and MoBa correlated fragment pairs by observing the coincidences between the γ-rays in each fragment. Zero-neutron to ten-neutron emission yields were determined; the latter for the first time. The zero-neutron emission can be understood as a new example of cluster radioactivity. These results demonstrate that the use of the high resolution γ-γ-γ coincidence technique employed here for the first time opens up a new approach to the study of the fission process that will provide previously inaccessible details of the process.

Structure of neutron rich nuclei: A typical example of the nucleus 11Li

The structure of 11Li as a typical example of the neutron dripline nuclei is studied in the microscopic framework of the 9Li+n+n three body system. It is called the hybrid model combining the cluster-orbital shell model with the extended cluster model. The study leads us to a plausible explanation of the binding mechanism of the 9Li+n+n three body system. The binding energy and the root mean square radius can be consistently reproduced. A few remarks are mentioned on the microscopic studies of the new type of the excitation modes in such neutron dripline nuclei.