[en] The Infinite Nuclear Matter (INM) model of atomic nuclei in its latest development has predicted masses of about 7000 nuclei extending over the entire nuclear chart spanning up to and beyond the neutron- and proton-drip lines. Apart from predicting the usual nuclear saturation properties leading to resolution of the r₀-paradox including extraction of the hitherto problematic nuclear incompressibility, it has the the characteristic local energy η carrying signature of shell structure and many other important features

[en] The unexpected disappearance of traditional landmark nuclear properties in neutron rich sd-shell nuclei has been a topic interest for long. In 1975, Thibault et. al. first pointed (via mass measurements) the unexpected high binding energies in ^31,32Na. Similar effects were subsequently observed in neutron-rich Ne and Mg isotopes. Recently, an experiment has been performed to explore these neutron rich exotic nuclei around N ∼ 20 'Island of Inversion' through electromagnetic excitation. The exclusive set-up for kinematically complete measurement, the ALADIN-LAND setup at GSI, Darmstadt was used for this purpose. The data analysis of that experiment (S306) is in an advanced stage of various detector calibration. In this article, identification of mass of exotic nuclei after secondary reaction will be presented

[en] Mass spectrometer measurements of the neutron rich sodium isotopes show a sudden increase at ³¹Na in the values of the two neutron separation energies. The spherical shell model naturally predicts a sudden decrease at ³²Na after the N=20 shell closure. It is proposed that the explanation for this disagreement lies in the fact that sodium isotopes in this mass region are strongly deformed due to the filling of negative parity orbitals from the 1f(7/2) shell. Hartree-Fock calculations are presented in support of this conjecture

[en] Beta-delayed two-neutron emission from mass-separated samples of short-lived sodium isotopes has been detected both by n-n time correlations with a 4π neutron counter and by γ-spectroscopic identification of daughter products with mass A-2. The observed cases (intensities per beta decay) are ³⁰Na(1.2 +- 0.2%), ³¹Na(0.70 +- 0.25%) and ³²Na(5.1 +- 1.8%). The results are in good agreement with a simple model of beta-delayed particle emission. (orig.)

[en] The authors describe unexpected findings on a routine myocardial perfusion scan where increased uptake of a Tc-99m MIBI (isonitrile) was seen in a thyroid nodule. Conventional thyroid scintigraphy and ultrasonography were also performed, for correlation. Surgical treatment revealed a Hurthle carcinoma of thyroid. They claim to the possibility of a new radiotracer for thyroid disease. (author)

No abstract available

[en] An upper limit P₃sub(n) < 5 x 10^-4 is found for the branching ratio of the β-delayed three-neutron emission from ³¹Na. (orig.)

[en] In this paper intruder configurations, make up of valence neutrons and protons, are shown to exhibit rotational features in the region of N = 20 far from stability. In ³⁰Ne, ³¹Na and ³²Mg the ground states are dominated by the intruders

[en] Complete text of publication follows. In order to explore the borders of island of inversion we investigated the nuclei ^30,31Na and ^33,34Mg by inelastic proton scattering in inverse kinematics. A ⁴⁰Ar primary beam of 94 MeV/nucleon energy with 60 pnA intensity was transported to a ¹⁸¹Ta production target of 0.5 mm thickness. The RIPS fragment separator analyzed the momentum and mass of the reaction products. The ^30,31Na and ^33,34Mg beams were produced in two individual runs with different settings of Bρ values. In the first run of ^30,31Na, the secondary beam included neutron-rich O, F, Ne and Na nuclei with A=Z ∼ 3 while mainly Mg and Al isotopes were mixed in the second run of ^33,34Mg. The total intensity was about 100 particle/s (pps) for both runs, while the ^30,31Na/^33,34Mg intensities reached 8, 6, 3 and 2 pps, respectively, on average. The identification of incident beam species was performed on an event-by-event basis by means of energy loss, time-of-flight (TOF) and magnetic rigidity (Bρ). The secondary beam hit a liquid hydrogen target. The mean energy of the isotopes in the target was around 50 MeV/nucleon. Two PPACs at F3 upstream of the target monitored the position of the incident particles. The reaction products and scattered particles were detected and identified by a PPAC and a silicon telescope. The Z identification was performed by TOF-energy loss method where the TOF was taken between the PPACs upstream and downstream of the secondary target. The isotope separation was done by use of the ΔE-E method. The de-exciting γ rays emitted by the inelastically scattered nuclei were detected by the DALI2 setup consisting of 146 NaI(Tl) scintillators surrounding the target (see, e.g., Figure 1). To determine the cross sections of the production of the γ rays in proton inelastic scattering the peak positions determined were fed into the detector simulation software GEANT4 and the resultant response curves plus smooth polynomial backgrounds were used to analyze the experimental spectra. From a distorted wave analysis of the cross sections, we derived 'matter' deformation parameters (βM), which are consistent with the charge deformations determined from Coulomb excitation experiments. Based on the 'matter' and charge deformation parameters, the neutron deformation parameters could also be extracted. The results show that all these nuclei are largely deformed; the deformation of the proton and neutron distributions are similar and cannot be distinguished at the present experimental uncertainties. (author)

[en] Deformation in the neutron-rich Na, Mg, Al, and Si isotopes at, and near, N = 20 is discussed from the viewpoint of intruder states and shape coexistence. Predictions of coexisting spherical and deformed states at low energy are made for ³¹Na, ³²Mg, ³³Al and ³⁴Si. (author)