D. Cano-Ott

Pulse pileup correction of large NaI(Tl) total absorption spectra using the true pulse shape

Abstract The usefulness of a simple numerical correction method of electronic pulse pileup distortion in measured energy spectra is investigated. The algorithm only requires the knowledge of the true pulse shape. The accuracy of the correction achieved for total absorption gamma-ray spectroscopy measurements with NaI(Tl) detectors is demonstrated.

Monte Carlo simulation of the response of a large NaI(Tl)total absorption spectrometer for β-decay studies

Abstract The response of a large NaI(Tl) total absorption spectrometer for β-decay studies is investigated.The accuracy of Monte Carlo simulations taking into account the light yield non-proportionality of NaI(Tl) and the detailed geometry is assessed through comparison with spectra measured for several radioactive sources.

Beta decay of 103In: Evidence for the Gamow-Teller resonance near 100Sn

Abstract The β decay of the neutron-deficient isotope 103 In was investigated by using total absorption γ-ray spectrometry on mass-separated sources. The measurement reveals a high-lying resonance of the β-decay strength in striking disagreement with high-resolution γ-ray data. The result is discussed in comparison with shell-model predictions.

Determination of the Gamow–Teller strength function for the neutron-deficient isotopes 104–107In

Abstract The Gamow–Teller β decays of the neutron-deficient indium isotopes 104–107 In have been investigated by using total absorption γ -ray spectrometry on mass-separated sources. The experimental Gamow–Teller strength, deduced as a function of the excitation energy in the daughter nuclei 104–107 Cd, is compared to shell-model predictions.

The GT Resonance revealed in β+-Decay using new experimental techniques

Abstract The GT beta decay of 150 Ho has been studied with a Total Absorption Spectrometer (TAS), with an array of 6 Euroball CLUSTER Ge detectors (the CLUSTER CUBE), and with an alpha detector. The three techniques complement each other. The results provide the first observation of an extremely sharp resonance in GT beta decay.

The rp-process and new measurements of β-delayed proton decay of light Ag and Cd isotopes

Abstract Recent network calculations suggest that a high temperature rp-process could explain the abundances of light Mo and Ru isotopes, which have long challenged models of p-process nuclide production. Important ingredients to network calculations involving unstable nuclei near and at the proton drip line are β-halflives and decay modes, i.e., whether or not β-delayed proton decay takes place. Of particular importance to these network calculation are the proton-rich isotopes 96 Ag, 98 Ag, 96 Cd and 98 Cd. We report on recent measurements of β-delayed proton branching ratios for 96 Ag, 98 Ag, and 98 Cd at the on-line mass separator at GSI.

Beta-decay of 97Ag: evidence for the Gamow-Teller resonance near 100Sn

The 97Ag→97Pd β-decay was investigated by using a total absorption spectrometer and an array of 6 Euroball-Cluster Ge detectors. A total of 603 γ-rays de-exciting 151 levels in 97Pd have been assigned. The Gamow-Teller β-decay strength distributions from the experiment and a shell-model calculation are compared, revealing a dominant resonance around a 97Pd excitation energy of 4 MeV with a width of about 1.5 MeV. An experimental quenching factor of about 4.9(7) for the total Gamow-Teller strength was obtained, which is close to the predicted theoretical hindrance factor.

A new Total Absorption Spectrometer for the study of exotic nuclei at the CERN/ISOLDE mass separator

We report here on a new Total Absorption Spectrometer dedicated to the study of exotic nuclei, presently installed at the CERN/ISOLDE mass separator.

Nuclear level density from beta decay measurements: The Gamow—Teller resonance as a lens to study nuclear properties

Using the results of β-decay studies with two complementary techniques, level density parameters for the nucleus 150Ho were deduced.