Trojan Horse Investigation for AGB Stellar Nucleosynthesis

Asymptotic Giant Branch (AGB) stars are among the most important astrophysical sites influencing the nucleosynthesis and the chemical abundances in the Universe. From a pure nuclear point of view, several processes take part during this peculiar stage of stellar evolution thus requiring detailed experimental cross section measurements. Here, we report on the most recent results achieved via the application of the Trojan Horse Method (THM) and Asymptotic Normalization Coefficient (ANC) indirect techniques, discussing the details of the experimental procedure and the deduced reaction rates. In addition, we report also on the on going studies of interest for AGB nucleosynthesis

The 10B(p,α)7Be S(E)-factor from 5 keV to 1.5 MeV using the Trojan Horse Method

The 10 B(p, α ) 7 Be reaction is the main responsible for the 10 B destruction in stellar interior [1]. In such environments this p-capture process occurs at a Gamow energy of 10 keV and takes places mainly through a resonant state (Ex = 8.701 MeV) of the compound 11 C nucleus. Thus a resonance right in the region of the Gamow peak is expected to significantly influence the behavior of the astrophysical S(E)-factor. The 10 B(p, α ) 7 Be reaction was studied via the Trojan Horse Method (THM) applied to the 2 H( 10 B, α 7 Be)n in order to extract the astrophysical S(E)-factor in a wide energy range from 5 keV to 1.5 MeV

Risk factors associated with adverse fetal outcomes in pregnancies affected by Coronavirus disease 2019 (COVID-19): a secondary analysis of the WAPM study on COVID-19.

Objectives To evaluate the strength of association between maternal and pregnancy characteristics and the risk of adverse perinatal outcomes in pregnancies with laboratory confirmed COVID-19. Methods Secondary analysis of a multinational, cohort study on all consecutive pregnant women with laboratory-confirmed COVID-19 from February 1, 2020 to April 30, 2020 from 73 centers from 22 different countries. A confirmed case of COVID-19 was defined as a positive result on real-time reverse-transcriptase-polymerase-chain-reaction (RT-PCR) assay of nasal and pharyngeal swab specimens. The primary outcome was a composite adverse fetal outcome, defined as the presence of either abortion (pregnancy loss before 22 weeks of gestations), stillbirth (intrauterine fetal death after 22 weeks of gestation), neonatal death (death of a live-born infant within the first 28 days of life), and perinatal death (either stillbirth or neonatal death). Logistic regression analysis was performed to evaluate parameters independently associated with the primary outcome. Logistic regression was reported as odds ratio (OR) with 95% confidence interval (CI). Results Mean gestational age at diagnosis was 30.6+/-9.5 weeks, with 8.0% of women being diagnosed in the first, 22.2% in the second and 69.8% in the third trimester of pregnancy. There were six miscarriage (2.3%), six intrauterine device (IUD) (2.3) and 5 (2.0%) neonatal deaths, with an overall rate of perinatal death of 4.2% (11/265), thus resulting into 17 cases experiencing and 226 not experiencing composite adverse fetal outcome. Neither stillbirths nor neonatal deaths had congenital anomalies found at antenatal or postnatal evaluation. Furthermore, none of the cases experiencing IUD had signs of impending demise at arterial or venous Doppler. Neonatal deaths were all considered as prematurity-related adverse events. Of the 250 live-born neonates, one (0.4%) was found positive at RT-PCR pharyngeal swabs performed after delivery. The mother was tested positive during the third trimester of pregnancy. The newborn was asymptomatic and had negative RT-PCR test after 14 days of life. At logistic regression analysis, gestational age at diagnosis (OR: 0.85, 95% CI 0.8-0.9 per week increase; pPeer reviewe

The Trojan Horse Method in Nuclear Astrophysics

The Trojan Horse Method (THM) represents the indirect way to measure reactions between charged particles at astrophysical energies. This is done by measuring the quasi free cross section of a suitable three body process. The basic features of the THM will be presented together with some applications to demonstrate its practical use

Rivista di studi salernitani. A.2, n.3 (1969)

A.2, n. 3 (1969): Giuseppe Capograssi, « Prassi che rovescia » o « Prassi che si rovescia »? con nota introduttiva di Pietro Piovani, P. 3 ; Fulvio Tessitore, Liberalismo come utopia, P. 9 ; Emanuele Riverso - Enzo Calogero, Saggio di assiologia opera- zionistica , P. 23 ; Giovanni De Crescenzo, La fenomenologia della vita affettiva e l’estroversione del desiderio in Hutchenson, P. 43 ; Angelo Trimarco, La poetica di André Breton , P. 61 ; Luigi Reina, La guerra di Alvaro, P. 81 ; Luigi Torraca, Otto trimetri inediti sulle dieci piaghe d’Egitto, P. 101 ; Gabriele De Rosa, Il Cilento nel Seicento e Settecento secondo le relazioni dei vescovi caputaquensi, P. 113 ; Gino Kalby, Il quartiere « Plaium montis » nel centro antico salernitano, P. 165 ; Augusto Placanica, I bilanci delle parrocchie calabresi nel secondo Settecento , P. 193 ; Angelo Sindoni, Un frutto tardivo dell’Opera dei Congressi in Sicilia: «Il Sole del Mezzogiorno» ( 1901-1903), P. 229 ; Lucio Avagliano, Alessandro Rossi e le origini dell’Italia industriale, P. 261 ; Raffaele Colapietra, I primi anni della « Critica », P. 293 ; Emanuele Greco, Il φρούριον di Moio della Civitella, P. 389 ; Giovanni Viansino, Derivazioni linguistiche e tematiche da Seneca il Vecchio a Seneca filosofo ed un richiamo ad Ovidio, P. 397 ; Giuseppe Rapisarda, Lettura poetica di Pedro Salinas, P. 405 ; Pasquale Natella - Paolo Peduto, La chiesa di Pino nei Lattari, P. 409 ; Oreste Gregorio, Un cronista settecentesco eburino , P. 415 ; Recensioni a G. C. Argan (Filiberto Menna), A. Boatto (Achille Bonito Oliva), A. Artaud (Maria Rosaria Lombardi), F. Menna (Angelo Trimarco), R. Giura Longo (Rosanna Buonocore), P. 42

The 18^{18}F(nn,α\alpha ) Reaction: First Study of nn-Induced Reaction on a Radioactive Nucleus Using the Trojan Horse Method

International audienceFor the first time the Trojan Horse Method was applied to infer information about a neutron induced reaction on a radioactive nucleus at low energies relevant for astrophysics. In particular, the ^18F(n, $\alpha$)^15N reaction has been studied by using the ^18F+d reaction. A ^18F beam was produced at the CRIB facility at RIKEN, Japan, and was focused onto a CD_2 target. The beam had energy of 48 MeV, an average intensity of 10^5 pps and an average purity of 80%. A new designed experimental set-up covering a large solid angle was used to detect the ejected particles. The reaction cross section has been for the first time investigated in the energy range from 0 up to 2.5 MeV and several resonant states of ^19F have been populated

Trojan Horse Method experiments with radioactive ion beams

The Trojan Horse Method (THM) is an indirect method that allows to get information about a two body reaction cross-section even at very low energy, avoiding the suppression effects due to the presence of the Coulomb barrier. The method requires a very accurate measurement of a three body reaction in order to reconstruct the whole kinematics and discriminate among different reaction mechanisms that can populate the same final state. These requirements hardly match with the typical low intensity and large divergence of radioactive ion beams (RIBs), and experimental improvements are mandatory for the applicability of the method. The first reaction induced by a radio activeion beam studied by applying the THM was the 18F(p,α)15O. Two experiments were performed in two different laboratories and using different experimental set-ups. The two experiments will be discussed and some results will be presented