[en] Nuclear masses can be used to identify changes in nuclear structure by observing changing trends in the two-neutron separation energy and are necessary for accurate modeling of extreme astrophysical environments. Beyond the limit of known masses, theoretical predictions are relied upon, however these predictions often disagree. For example, in the region of ⁶²Ti, where an island of inversion is predicted, theoretical mass predictions disagree by several MeV. The Time-of-Flight Magnetic Rigidity (TOF-Bρ) method provides a way to measure the masses of nuclei far from the valley of beta-stability with sufficient precision to map general features in nuclear structure and substantially reduce nuclear physics uncertainties in astrophysics simulations. We recently performed a TOF-Bρ mass measurement at the National Superconducting Cyclotron Laboratory where significant progress has been made on the neutron-rich side of stability in the Sulfur to Zinc region. Preliminary data and details of the analysis procedure will be discussed. (author)

[en] The evolution of single-particle neutron spectra in the N = 40 isotones "6"0Ca, "6"2Ti, "6"4Cr, "6"6Fe, "6"8Ni, and "7"0Zn is calculated on the basis of the mean-field model featuring a dispersive optical potential. The results of these calculations agree with the idea that the degree of collectivity becomes higher in the "6"4Сr nucleus and that the coupling of single-particle motion to this collectivity becomes stronger, as well as with available experimental data, which are indicative of the closure of the N = 40 subshell in "6"8Ni and of the trend toward this closure in "6"0Ca.

No abstract available

[en] The production of the most neutron-rich nuclei by the fragmentation of ⁴⁸Ca and ⁷⁶Ge beams at Michigan State are presented. The cross sections were measured for a large range of nuclei including fifteen new isotopes that are the most neutron-rich nuclides of magnesium, aluminum, silicon, and the elements from chlorine to manganese. The observation of ⁴²Al was itself surprising. The cross sections of several new nuclei are enhanced relative to a simple thermal evaporation framework, previously shown to describe similar production cross sections, indicates that precursor excited nuclei in the region around ⁶²Ti that decay to the observed nuclei may be more stable than predicted by current mass models. This may be evidence for a new island of inversion similar to that centered on ³¹Na. It was recently announced that Michigan State will be the site of the next generation radioactive beam facility, FRIB, for the United States. A brief overview of the proposed facility are presented.

[en] We present here the mass excesses, binding energies, one- and two-neutron, one- and two-proton and α-particle separation energies of 6727 nuclei in the ranges 4≤Z≤120 and 8≤A≤303 calculated in the infinite nuclear matter model. Compared to our predictions of 1999 mass table, the present ones are obtained using larger data base of 2003 mass table of Wapstra and Audi and resorting to higher accuracy in the solutions of the η-differential equations of the INM model. The local energy η’s supposed to carry signature of the characteristic properties of nuclei are found to possess the predictive capability. In fact η-systematics reveal new magic numbers in the drip-line regions giving rise to new islands of stability supported by relativistic mean field theoretic calculations. This is a manifestation of a new phenomenon where shell-effect overcomes the instability due to repulsive components of the nucleon–nucleon force broadening the stability peninsula. The two-neutron separation energy-systematics derived from the present mass predictions reveal a general new feature for the existence of islands of inversion in the exotic neutron-rich regions of nuclear landscape, apart from supporting the presently known islands around ³¹Na and ⁶²Ti. The five global parameters representing the properties of infinite nuclear matter, the surface, the Coulomb and the pairing terms are retained as per our 1999 mass table. The root-mean-square deviation of the present mass-fit to 2198 known masses is 342 keV, while the mean deviation is 1.3 keV, reminiscent of no left-over systematic effects. This is a substantive improvement over our 1999 mass table having rms deviation of 401 keV and mean deviation of 9 keV for 1884 data nuclei.

[en] The presentation will address nuclear structure and shell evolution at extreme isospin values, studied via in-beam gamma-ray spectroscopy at intermediate energies. Besides an introduction of the setup, recent results will be presented. These include shape transitions and deformation at the N=60 island of deformation around ⁹⁶Kr, shell effects for N=70 isotones down to ¹¹⁰Zr, and other topics. This document is composed of an abstract and the slides of the presentation. (authors)

[en] The results of measurements of the production of neutron-rich nuclei by the fragmentation of a ⁷⁶Ge beam are presented. The cross sections were measured for a large range of nuclei including 15 new isotopes that are the most neutron-rich nuclides of the elements chlorine to manganese (⁵⁰Cl, ⁵³Ar, ^55,56K, ^57,58Ca, ^59,60,61Sc, ^62,63Ti, ^65,66V, ⁶⁸Cr, ⁷⁰Mn). The enhanced cross sections of several new nuclei relative to a simple thermal evaporation framework, previously shown to describe similar production cross sections, indicates that nuclei in the region around ⁶²Ti might be more stable than predicted by current mass models and could be an indication of a new island of inversion similar to that centered on ³¹Na

[en] Experimental nuclear spectroscopic data for known nuclides of mass number 62 (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge) have been evaluated and presented together with adopted properties of levels and γ rays. New high-spin data are available for ⁶²Ga, and ⁶²Zn. Results of in-beam γ-ray studies for ⁶²Cu producing high-spin states are in conflict in terms of gamma-ray placements and branching ratios. In the opinion of the evaluators, a detailed study of high-spin structures in ⁶²Cu is needed to obtain a consistent and confident level scheme. Precise studies of superallowed β decay of ⁶²Ga to ⁶²Zn by several groups have extended the decay scheme. No significant new data, since the 2000 NDS for A = 62 (2000Hu18), have been reported for ⁶²Co, ⁶²Ni and ⁶²Cu. No data are yet available for excited states in ⁶²Ti and ⁶²V, and those for ⁶²Cr and 62Ge are scarce. The level lifetime data are available in very few cases. The radioactive decay schemes of ⁶²Ti and ⁶²Ge are unknown, and those for ⁶²V, ⁶²Cr and 92-ms ⁶²Mn are scantily known. The data presented here supersede those in the earlier NDS publications.

[en] The recent production of the most neutron-rich nuclei by the fragmentation of ⁴⁸Ca and ⁷⁶Ge beams at Michigan State are presented. The cross sections were measured for a large range of nuclei including fifteen new isotopes that are the most neutron-rich nuclides of magnesium, aluminum, silicon, and the elements from chlorine to manganese. The cross sections of several new nuclei were found to be enhanced relative to a simple thermal evaporation framework that was previously shown to describe similar production cross sections. This difference indicates that precursor excited nuclei in the region around ⁶²Ti that decay to the observed nuclei may be more stable than predicted by current mass models. The enhanced stability may be evidence for a new island of inversion similar to that centered on ³¹Na. The NSCL at Michigan State University was recently selected to be the site of the next generation radioactive beam facility, FRIB, for the United States. A brief overview of the proposed facility and some of its capabilities are presented.

[en] Production cross sections for neutron-rich nuclei from the fragmentation of a ⁷⁶Ge beam at 132 MeV/u were measured. The longitudinal momentum distributions of 34 neutron-rich isotopes of elements 13≤Z≤27 were scanned using a novel experimental approach of varying the target thickness. Production cross sections with beryllium and tungsten targets were determined for a large number of nuclei, including 15 isotopes first observed in this work. These are the most neutron-rich nuclides of the elements 17≤Z≤25 (⁵⁰Cl, ⁵³Ar, ^55,56K, ^57,58Ca, ^59,60,61Sc, ^62,63Ti, ^65,66V, ⁶⁸Cr, and ⁷⁰Mn). A one-body Q_g systematics is used to describe the production cross sections based on thermal evaporation from excited prefragments. Some of the fragments near ⁵⁸Ca show anomalously large production cross sections.