[en] The ⁴⁰Ca(⁴He,⁸He)³⁶Ca reaction has been used to provide the first observation of the nuclide ³⁶Ca. The Q value and mass excess were found to be -57.58 +- 0.04 and -6.44 +- 0.04 MeV, respectively. The new mass completes four members of the A = 36 isobaric quintet and hence serves as a test of the isobaric multiplet mass equation

[en] We give a description for the production of ¹³C foils and the preparation of an approximately 1 mg/cm² thick target. A recent experiment to measure the mass of ³⁶Ca via the ⁴⁰Ca(⁴He,⁸He)³⁶Ca reaction at the S800 magnetic spectrometer at MSU, needed a precise determination of the beam energy and calibration of the focal plane of the magnetic spectrometer in order to achieve the most accurate value for the ³⁶Ca mass. The 1 mg/cm²¹³C target was essential for these purposes. Target performance along with some preliminary results will also be discussed

[en] We measure the mass of the lowest T=2 state in ³⁶K by observing β-delayed protons following the superallowed ³⁶Ca decay and use this result to make a precise test of the isobaric multiplet mass equation

[en] Complete text of publication follows. Isospin symmetry is a consequence of the approximate charge invariance of nucleon-nucleon forces. The strong interaction conserves the charge symmetry very well and the Coulomb energies are almost state-independent in a nucleus. The large bulk displacement energies produced by the monopole part of the Coulomb ?eld are approximately cancelled in the excitation energy differences of the mirror nuclei. As a result, energy spectra are quite analogous between mirror nuclei. A small Coulomb effect may remain, due to differences in the radii of the single particle states. Especially, when the proton states are weakly bound, the wave function of the protons in the last shell becomes wider due to larger penetration to the classically forbidden region and consequently the Coulomb energy decreases. In the neutron-deficient ³⁶Ca, the 2₁⁺ state is expected to be unbound by about 500 keV, which may allow for a larger extension of the proton orbits. A measure of the increase of the proton radius may be the lowering of the energy of the 2₁⁺ state in ³⁶Ca relative to the position of the same state in the mirror nucleus ³⁶S. To check if this happens, an experiment was performed at GANIL in Caen, France. During the experiment the primary ⁴⁰Ca beam of around 95 A x MeV was fragmented in the SISSI target. The resulting beam cocktail was purified in the 'α' spectrometer consisting of two dipole magnets and a degrader with the setting optimised for ³⁷Ca. The fragments were identified event by event through a time-of-flight measurement between the spectrometer and the secondary ⁹Be target of 1072 μm thickness, in which further nucleons were removed at an energy of around 61 A x MeV. After passing through the target, the produced fragments were identified using the spectrometer SPEG by time-of-flight and energy loss measurements. To detect the emitted gamma rays, the Chateau de Cristal array consisting of 74 BaF₂ scintillators was placed around the Be target. The Doppler-corrected gamma-ray spectrum obtained for ³⁶Ca is shown in fig. 1. Using Gaussian fits for the peaks, the energy of the 2⁺ state in ³⁶Ca has been determined to be E(2⁺) 3050(60) keV, 240 keV lower than the corresponding value in ³⁶S much larger than the usual mirror energy differences, indicating a drip line effect. (author)

[en] The cross section for the knock-out of a deeply bound valence neutron from ³⁷Ca at an incident beam energy of 60 A MeV has been measured along with momentum distributions of the residual nuclei and? rays from the de-excitation of the first excited state in ³⁶Ca. As for other cases of deeply bound nucleons studied using knock-out reactions, the reduction of the measured cross section compared to theoretical predictions is stronger than those observed for near-magic stable nuclei. Both the momentum distributions and the excitation energy of the first excited state in ³⁶Ca indicate a sizable N = 16 gap. (authors)

[en] An experiment was performed to study excited states in neutron-deficient nuclei around Ca. After a first fragmentation of the primary beam, the one-neutron knockout reaction was used to produce ³⁶Ca ions from the ³⁷Ca secondary beam and in-beam γ rays were measured. The energy of the first excited 2⁺ state in ³⁶Ca and the cross section for the 1-neutron knock-out reaction from ³⁷Ca at ∼ 45 A MeV were obtained. The 2⁺ energy in ³⁶Ca is compared to the mirror nucleus ³⁶S to deduce information on the isospin dependence of the nuclear force near the proton drip line. Furthermore, for two other T_z=-2 nuclei, ²⁸S and ³²Ar, the deexcitation of the first 2⁺ states has been observed. (author)

[en] Continuum-coupling correction to binding energies in neutron rich oxygen and fluorine isotopes and to excitation energies of 2⁺₁ states in ³⁶Ca and ³⁶S mirror nuclei are studied using the real-energy continuum shell model. (author)

[en] The β-decay of the Tz = -2 nucleus ³⁶Ca was studied at the LISE3 magnetic spectrometer at GANIL. Two new proton-emitting states have been detected by a new experimental method and the other nine βρ and βγ known transitions have been remeasured with improved resolution. A simulation with GEANT code has been applied to this experimental setup resulting a very useful tool for the analysis. A comparison with shell model calculations is given. (author)

[en] We give a description for the production of ¹³C foils and the preparation of an approximately 1-mg/cm² thick target. A recent experiment to measure the mass of ³⁶Ca, via the ⁴⁰Ca(⁴He,⁸He)³⁶Ca reaction, required precise determination of the accelerated beam energy and calibration of the focal plane of a magnetic spectrometer to achieve the most accurate value for the ³⁶Ca mass. A 1 mg/cm²¹³C target was essential for these purposes. Target preparation and performance along with some preliminary results will be discussed

[en] Mass spectrometry based on an accelerator allows to measure rare cosmogenic isotopes found in natural samples with isotopic abundances up to 10E-15. The XTU Tandem of Legnaro National Laboratories can measure mean heavy isotopes (36Cl, 41Ca, 129I) in applications interesting cosmochronology and Medicine. The TTT-3 Tandem of the Naples University has been modified in view of precision studies of C14 in Archeology, Paleantology and Geology. In this paper a review is made of principles and methodologies and of some applicationy in the framework of the National Program for mass spectrametry research with the aid of accelerators