Competition between Allowed and First-Forbidden ß Decay: The Case of

The ß decay of ^{208}Hg into the one-proton hole, one neutron-particle _{81}^{208}Tl_{127} nucleus was investigated at CERN-ISOLDE. Shell-model calculations describe well the level scheme deduced, validating the proton-neutron interactions used, with implications for the whole of the N>126, Z<82 quadrant of neutron-rich nuclei. While both negative and positive parity states with spin 0 and 1 are expected within the Q_{ß} window, only three negative parity states are populated directly in the ß decay. The data provide a unique test of the competition between allowed Gamow-Teller and Fermi, and first-forbidden ß decays, essential for the understanding of the nucleosynthesis of heavy nuclei in the rapid neutron capture process. Furthermore, the observation of the parity changing 0^{+}→0^{-}ß decay where the daughter state is core excited is unique, and can provide information on mesonic corrections of effective operators.

Perspective of health personnel on end-of-life care in Intensive Care Units. / Perspectiva de los profesionales de la salud sobre cuidados al final de la vida en unidades de cuidados intensivos.

OBJECTIVE: To understand for what care of the patient at the end of life and their relatives means to ICU health professionals. METHODS: Qualitative study with a Research-Action (AI) design, in two intensive care units of the city of Bogotá. Groups were formed in each unit and each group included at least six health professionals, the data collection techniques were: 4 participative assemblies and 6 clinical narratives, the data analysis was done through the preparation of the data, discovery of topics, coding and interpretation of data, relativisation and rigour of the data. RESULTS: 20 ICU workers participated, the analysis of the data revealed four thematic categories: Multidisciplinary team of the ICU facing the end-of-life process, Management of critical patients and their families at the end of life in the ICU, Communication process between the patient, family and multidisciplinary team at the end of life, Ethical aspects at the end of life in the ICU CONCLUSIONS: The professionals consider preserving quality of life during the patient's stay in the ICU a therapeutic objective. The development of evidence-based guidelines that facilitate multidisciplinary management at the end of life, customisation of care, effective communication, fulfilling the physical, emotional and spiritual needs of the person and their family and favouring the patient's right of autonomy in decision making.

First Accurate Normalization of the ß-delayed α Decay of

The ^{12}C(α,γ)^{16}O reaction plays a central role in astrophysics, but its cross section at energies relevant for astrophysical applications is only poorly constrained by laboratory data. The reduced α width, γ_{11}, of the bound 1^{-} level in ^{16}O is particularly important to determine the cross section. The magnitude of γ_{11} is determined via sub-Coulomb α-transfer reactions or the ß-delayed α decay of ^{16}N, but the latter approach is presently hampered by the lack of sufficiently precise data on the ß-decay branching ratios. Here we report improved branching ratios for the bound 1^{-} level [b_{ß,11}=(5.02±0.10)×10^{-2}] and for ß-delayed α emission [b_{ßα}=(1.59±0.06)×10^{-5}]. Our value for b_{ßα} is 33% larger than previously held, leading to a substantial increase in γ_{11}. Our revised value for γ_{11} is in good agreement with the value obtained in α-transfer studies and the weighted average of the two gives a robust and precise determination of γ_{11}, which provides significantly improved constraints on the ^{12}C(α,γ) cross section in the energy range relevant to hydrostatic He burning.