36 research outputs found
One-neutron transfer reaction in the O + Ti collision at 275 MeV
The present article reports new data on the
Ti(O,O)Ti reaction at 275 MeV incident energy as
part of the systematic research pursued within the NUMEN project. Supplementary
measurements of the same reaction on O and Al targets were also
performed in order to estimate the background arising from the use of a
composite target (TiO + Al). These data were analyzed under the
same theoretical framework as those obtained with the titanium target in order
to reinforce the conclusions of our analysis. Differential cross-section
angular distribution measurements for the O ejectiles were
performed in a wide angular range by using the MAGNEX large acceptance magnetic
spectrometer. The experimental results were analyzed within the distorted-wave
and coupled-channels Born Approximation frameworks. The optical potentials at
the entrance and exit channels were calculated in a double folding approach
adopting the S\~ao Paulo potential, and the spectroscopic amplitudes for the
projectile and target overlaps were obtained from large-scale shell model
calculations. The differential cross-sections are well-described by the
theoretical calculations, where a weak coupling to collective excitations of
projectile and target is inferred. The sensitivity of transfer cross-sections
on different model spaces adopted in nuclear structure calculations, is also
discussed
One-proton transfer reaction for the O 18 + Ti 48 system at 275 MeV
Single-nucleon transfer reactions are processes that selectively probe single-particle components of the populated many-body nuclear states. In this context, recent efforts have been made to build a unified description of the rich nuclear spectroscopy accessible in heavy-ion collisions. An example of this multichannel approach is the study of the competition between successive nucleon transfer and charge exchange reactions, the latter being of particular interest in the context of single and double beta decay studies. To this extent, the one-proton pickup reaction Ti48(O18,F19)Sc47 at 275 MeV was measured for the first time, under the NUMEN experimental campaign. Differential cross-section angular distribution measurements for the F19 ejectiles were performed at INFN-LNS in Catania by using the MAGNEX large acceptance magnetic spectrometer. The data were analyzed within the distorted-wave and coupled-channels Born approximation frameworks. The initial and final-state interactions were described adopting the São Paulo potential, whereas the spectroscopic amplitudes for the projectile and target overlaps were derived from shell-model calculations. The theoretical cross sections are found to be in very good agreement with the experimental data, suggesting the validity of the optical potentials and the shell-model description of the involved nuclear states within the adopted model space
The NUMEN heavy ion multidetector for a complementary approach to the neutrinoless double beta decay
Neutrinos are so far the most elusive known particles, and in the last decades many sophisticated experiments have been set up in order to clarify several questions about their intrinsic nature, in particular their masses, mass hierarchy, intrinsic nature of Majorana or Dirac particles. Evidence of the Neutrinoless Double-Beta Decay (NDBD) would prove that neutrinos are Majorana particles, thus improving the understanding of the universe itself. Besides the search for several large underground experiments for the direct experimental detection of NDBD, the NUMEN experiment proposes the investigation of a nuclear mechanism strongly linked to this decay: the Double Charge Exchange reactions (DCE). As such reactions share with the NDBD the same initial and final nuclear states, they could shed light on the determination of the Nuclear Matrix Elements (NMEs), which play a relevant role in the decay. The physics of DCE is described elsewhere in this issue, while the focus of this paper will be on the challenging experimental apparatus currently under construction in order to fulfil the requirements of the NUMEN experiment. The overall structure of the technological improvement to the cyclotron, along with the newly developed detection systems required for tracking and identifying the reaction products and their final excitation level are described
The NUMEN heavy ion multidetector for a complementary approach to the neutrinoless double beta decay
Neutrinos are so far the most elusive known particles, and in the last decades many sophisticated experiments have been set up in order to clarify several questions about their intrinsic nature, in particular their masses, mass hierarchy, intrinsic nature of Majorana or Dirac particles. Evidence of the Neutrinoless Double-Beta Decay (NDBD) would prove that neutrinos are Majorana particles, thus improving the understanding of the universe itself. Besides the search for several large underground experiments for the direct experimental detection of NDBD, the NUMEN experiment proposes the investigation of a nuclear mechanism strongly linked to this decay: the Double Charge Exchange reactions (DCE). As such reactions share with the NDBD the same initial and final nuclear states, they could shed light on the determination of the Nuclear Matrix Elements (NMEs), which play a relevant role in the decay. The physics of DCE is described elsewhere in this issue, while the focus of this paper will be on the challenging experimental apparatus currently under construction in order to fulfil the requirements of the NUMEN experiment. The overall structure of the technological improvement to the cyclotron, along with the newly developed detection systems required for tracking and identifying the reaction products and their final excitation level are described
Recent results on heavy-ion direct reactions of interest for 0νββ decay at INFN LNS
Neutrinoless double beta decay of nuclei, if observed, would have important implications on fundamental physics. In particular it would give access to the effective neutrino mass. In order to extract such information from 0νββ decay half-life measurements, the knowledge of the Nuclear Matrix Elements (NME) is of utmost importance. In this context the NUMEN and the NURE projects aim to extract information on the NME by measuring cross sections of Double Charge Exchange reactions in selected systems which are expected to spontaneously decay via 0νββ. In this work an overview of the experimental challenges that NUMEN is facing in order to perform the experiments with accelerated beams and the research and development activity for the planned upgrade of the INFN-LNS facilities is reported
Recent results on Heavy-Ion induced reactions of interest for 0νββ decay
An updated overview of recent results on Heavy-Ion induced reactions of interest for neutrinoless double beta decay is reported in the framework of the NUMEN project. The NUMEN idea is to study heavy-ion induced Double Charge Exchange (DCE) reactions with the aim to get information on the nuclear matrix elements for neutrinoless double beta (0νββ) decay. Moreover, to infer the neutrino average masses from the possible measurement of the half- life of 0νββ decay, the knowledge of the nuclear matrix elements is a crucial aspec
Quality of life in Mexican women with breast cancer in different clinical stages and its association with socio-demographic features, comorbidity states and care process characteristics in the Mexican Institute of Social Security [Calidad de Vida en Mujeres Mexicanas con C�ncer de Mama en Diferentes Etapas Cl�nicas y su Asociaci�n con Caracter�sticas Socio-Demogr�ficas, Estados Co-M�rbidos y Caracter�sticas del Proceso de Atenci�n en el Instituto Mexicano del Seguro Social]
Introduction: Quality of Life is the most studied PRO (patient reported outcome) in cancer patients. With early diagnosis and better treatments in breast cancer, this entity has been transformed in a chronic disease with longer survival. The joint effects of diseases and treatment on quality of life are each day more important to consider in survival patients. Objective: To evaluate Quality of Life, Socioeconomic factors, co-morbidities, and the attendance process impact on quality of life in breast cancer women with different clinical stages attending at the Instituto Mexicano del Seguro Social using the EORCT QLQ-C30 Results: The scores of EORTC QLQ-C30 (v3) were: Global health status / QoL: 73.47 (�20.81), physical functioning 76.98 (�20.85), role functioning 76.60 (�27.57), emotional functioning 64.53 (�26.81), cognitive functioning 74.47 (�26.02), social functioning 84.96 (�23.20), fatigue 31.94 (�25.45), nausea and vomiting 19.49 (�26.93), pain 28.95 (�27.27), dyspnea 15.29 (�24.62), insomnia 35.13 (�32.10), appetite lost 18.04 (�28.75), 18.04 (�28.75), constipation 19.20 (�32.11), diarrhea 12.9 (�24.25), financial difficulties 40.57 (�37.26). The scores with EORTC QLQ-BR23 were: body image 74.84 (�31.69), sexual functioning13.73 (�22.55), sexual enjoyment 32.86 (�36.17), future perspectives 51.69 (�38.00), systemic therapy side effects 30.82 (�20.71), breast symptoms22.85 (�23.49), arm symptoms 27.53 (�24.75), upsert by hair loss 43.80 (�44.01). Conclusions: Clinical stage in breast cancer is associated with differences in the scores from fatigue, nausea and vomiting and financial difficulties according to the evolution of the disease and the physical detriment associated. Socio-demographic features were related role functioning, fatigue and pain in single women with higher scores. � 2011 International Society for Pharmacoeconomics and Outcomes Research (ISPOR)
The NUMEN Project @ LNS: Status and Perspectives
The NUMEN project aims at accessing experimentally driven information on
Nuclear Matrix Elements (NME) involved in the half-life of the
neutrinoless double beta decay (0 nu beta beta), by high-accuracy
measurements of the cross sections of Heavy Ion (HI) induced Double
Charge Exchange (DCE) reactions. Particular attention is given to the
(O-18, Ne-18) and (Ne-20, O-20) reactions as tools for beta+beta+ and
beta-beta-decays, respectively. First evidence about the possibility to
get quantitative information about NME from experiments is found for
both kind of reactions. In the experiments, performed at INFN Laboratory
Nazionali del Sud (LNS) in Catania, the beams are accelerated by the
Superconducting Cyclotron (CS) and the reaction products are detected
the MAGNEX magnetic spectrometer. The measured cross sections are
challengingly low, limiting the present exploration to few selected
isotopes of interest in the context of typically low-yield experimental
runs. A major upgrade of the LNS facility is foreseen in order to
increase the experimental yield of at least two orders of magnitude,
thus making feasible a systematic study of all the cases of interest.
Frontiers technologies are going to be developed, to this purpose, for
the accelerator and the detection systems. In parallel, advanced
theoretical models will be developed in order to extract the nuclear
structure information from the measured cross sections
Measuring nuclear reaction cross sections to extract information on neutrinoless double beta decay
Neutrinoless double beta decay (0 nu beta beta) is considered the best
potential resource to access the absolute neutrino mass scale. Moreover,
if observed, it will signal that neutrinos are their own anti-particles
(Majorana particles). Presently, this physics case is one of the most
important research “beyond Standard Model” and might guide the way
towards a Grand Unified Theory of fundamental interactions.
Since the 0 nu beta beta decay process involves nuclei, its analysis
necessarily implies nuclear structure issues. In the NURE project,
supported by a Starting Grant of the European Research Council (ERC),
nuclear reactions of double charge-exchange (DCE) are used as a tool to
extract information on the 0 nu beta beta Nuclear Matrix Elements. In
DCE reactions and beta beta decay indeed the initial and final nuclear
states are the same and the transition operators have similar structure.
Thus the measurement of the DCE absolute cross-sections can give crucial
information on beta beta matrix elements. In a wider view, the NUMEN
international collaboration plans a major upgrade of the INFN-LNS
facilities in the next years in order to increase the experimental
production of nuclei of at least two orders of magnitude, thus making
feasible a systematic study of all the cases of interest as candidates
for 0 nu beta beta