检索结果-南通市图书馆

Case Reports in Clinical Medicine 2013年第2期2卷 163-166页

作者： Ankouane Andoulo Firmin Ngo Nonga Bernadette Monabang Catherine Djapa Roger Tchoumi Eric njoya Oudou Ndjitoyap Ndam Elie Claude D. P. McManus Malonga Eimo Department of Internal Medicine Faculty of Medicine and Biomdical Sciences University of Yaounde I Yaounde Cameroon Department of Radiology Faculty of Medicine and Biomdical Sciences University of Yaounde I Yaounde Cameroon Department of Surgery Faculty of Medicine and Biomdical Sciences University of Yaounde I Yaounde Cameroon Donald Peter McManus Infectious Disease Division Queensland Institute of Medical Research Brisbane Australia

Splenic cysts are rare lesions and most of them are hydatid in origin. Hydatid disease is very rare in central Africa although it is cosmopolitan in North Africa. We are presenting a case of intracystic bleeding complicated with shock in a rural based Cameroonian and owner of hunting dogs treated in our university teaching hospital.

关键词： Hydatid Disease Cyst Bleeding Splenectomy

Prevalence of Hepatitis C Virus and Associated Risk Factors among Inmates at New Bell Prison, Douala, Cameroon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Epidemiology 2019年第2期9卷 119-128页

作者： Mathurin Pierre Kowo Firmin Ankouane Andoulo Larry Tangie Ngek Daniel Tchamdeu Sizimboue Antonin Ndjitoyap Ndam Buno Ela Ondo Servais Eloumou Bagnaka Rocard Djanteng Elie-Claude Ndjitoyap Ndam Oudou njoya Department on Internal Medicine and Specialities Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon Université des Montagnes Banganté Cameroon Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Medical Center New Bell Prison Douala Cameroon

Although a high prevalence of HCV infection in correctional facilities has been well reported in several countries around the world, there has been no such data from Cameroon. The aim of this study was to determine the prevalence and factors associated with viral hepatitis C seropositivity among prisoners incarcerated at the New Bell Central Prison in Douala. From the 2nd to the 27th of July 2018, 940 inmates selected using a systematic random sampling method were interviewed to collect data on sociodemographic status, duration of incarceration, number of incarcerations and risk factors for HCV transmission. Blood samples were collected for screening of anti-HCV antibodies via HEPA-SCAN HCV CARD Test. Positive samples had a confirmatory ELISA test. Data were analysed using EPI DATA 4.***.0.0 software. Statistical significance was set at a p < 0.05. Of the 940 prisoners selected, 94.1% (884) were males. The mean age of the study population was 33.81 ± 10.35 years (extremes: 14 and 74 years). HCV prevalence was 4.4% (40). The use of non-injectable illicit drugs (OR 2.87 95% CI 1.44 - 5.73) (p = 0.002) but not injectable illicit drugs (OR 1.91 95% CI 0.43 - 8.41) (p = 0.42), male homosexuality (OR 17.45 95% CI 7.58 - 40.13) (p < 0.001), sharing of needles (OR 3.45 95% CI 1.59 - 7.83) (p = 0.001), past history of tattooing or piercing (OR 5.94 95% CI 2.80 - 12.16) (p < 0.001) and age ≥ 50 (OR 4.069;95% CI 1.9 - 8.68) (p = 0.003) were significantly associated with HCV antibodies positivity. Inmates in New Bell Central Prison accumulate risk factors for viral hepatitis C, thus contributing to the high prevalence in this setting. Control strategies and programs that reach this particular population should urgently be implemented.

关键词： Prevalence Risks factors Hepatitis C Prisoners

Management of Endoscopic Portal Hypertension Lesions in Cirrhotic Patients in a Country with Limited Resources: About 603 Cases in the City of Douala in Cameroon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Gastroenterology 2023年第12期13卷 429-438页

作者： Winnie Tatiana Bekolo Nga Aghoani Gilles Machékam-Matanga Olga Antonin Ndjitoyap Agnès Malongue Mathurin Kowo Dominique Noah Noah Oudou njoya Firmin Ankouane Andoulo Luma Henry Namme Servais Albert Fiacre Eloumou Bagnaka Department of Internal Medicine the Douala General Hospital Douala Cameroon Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Faculty of Medicine University of Buea Buea Cameroon Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon

Introduction: Portal hypertension (HTP) is a morbi-mortality factor in cirrhotic patients. It is responsible for endoscopic lesions and has digestive hemorrhage as the main complication. The objective of the study was to study the management of endoscopic lesions of portal hypertension in a country with limited resources. Methodology: This was a cross-sectional and analytical study conducted in 04 hospitals in the city of Douala, Cameroon, over a period of 08 years from 1 January 2014 to 31 December 2022. Included were cirrhotic patients with viral hepatitis with endoscopic lesions of PH. The data collected were sociodemographic, clinical, paraclinical, therapeutic and evolutionary. Data analysis was done using SPSS software version 25.0. Logistic regression allowed the search for prognostic factors with a significance threshold of p Results: We included 603 patient records. They were mainly male patients (56.1%) with an average age of 47.6 ± 6.3 years. The Child Pugh score was ranked B in 53.7% of cases. Digestive hemorrhage was the main complication in 66.8% of cases. We had grade 2 esophageal varices in 61.5% of cases. The main treatments were prescription of propanolol (63.3%) and ligation of esophageal varices (53.3%). The average number of ligation sessions was 2.1 ± 1.8 with an interval between sessions of 28 ± 2.8 days. Prevention of rupture of esophageal varices was secondary in 66.5% of cases (n = 452). The rate of hemorrhagic recurrence was 9.3%. Hospital mortality was 15.1%. Recurrence of hemorrhage was associated with PT Conclusion: The management of HTP lesions was based on the prescription of beta-blockers and the ligation of esophageal varices. Factors associated with mortality were hemorrhagic recurrence, low PT and Child Pugh C score.

关键词： Portal Hypertension Cirrhosis Endoscopic Lesions PEC Cameroon

Clinical Aspects and Precipitating Factors of Hepatic Encephalopathy Associated with Cirrhosis in a Cameroonian Population

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Gastroenterology 2019年第11期9卷 228-238页

作者： Mathurin Pierre Kowo Edgar Kenne Yimagou Firmin Ankouane Andoulo Antonin Wilson Ndjitoyap Ndam Bonaventure Jemea Servais Albert Fiacre Eloumou Bagnaka Patricia Ouamba Guekam Larissa Pessidjo Eric Tchoumi Leuwat Dominique Noah Noah Oudou njoya Faculty of Medicine and Biomedical Sciences The University of Yaoundé I Yaoundé Cameroon Research Laboratory on Viral Hepatitis and Health Communication Yaoundé Cameroon Internal Medicine Unit Yaounde University Teaching Hospital Yaoundé Cameroon Gastroenterology Unit Central Hospital Yaoundé Cameroon Faculty of Medicine and Pharmaceutical Sciences The University of Douala Douala Cameroon

Background: Hepatic Encephalopathy (HE), a common complication of cirrhosis, is associated with a pejorative prognosis. This study aims to describe the clinical presentation, precipitating factors and outcome of HE. Methods: This was a cross-sectional multicenter inpatient study in cirrhotic patients admitted for HE in four tertiary hospitals in Yaoundé (Cameroon) from December 2016 to May 2017. The diagnosis of HE was based on West Haven clinical criteria. The diagnosis of cirrhosis was made using clinical and/or biological, endoscopic and/or ultrasonography signs. Results: A total of 53 patients with HE (mean age: 49.9 ± 18.9 years, 35 Males) were included. The frequency of hospital admission for HE was 4.9%. HE grade III was the most common (37.7%), followed by grades I and II (26.4% and 26.4%, respectively). Grade IV was present in 9.4% of cases. According to the Child-Pugh score, 72.1% of the patients were at stage C and 27.9% at stage B. The main precipitating factors found were: constipation (38.5%), hyponatremia (35.9%), hepatocellular carcinoma (HCC) (31.7%), herbal medicine (28.3%), hypokalemia (25.6%), gastrointestinal bleeding (22.6%) and ascitic fluid infection (spontaneous bacterial peritonitis) (13.8%). In 5.7% of cases, no factor was identified. Mortality rate during hospitalization was 45.3% and was significantly associated with stage III (RR = 11.1;95% CI: 1.9 - 64.5;p = 0.003) and IV (RR = 24;95% CI: 1.6 - 40.9;p = 0.01) of HE;Child-Pugh C score (RR = 15.2;95% CI: 1.7 - 30.1;p = 0.003) and hypokalemia (RR = 12.2;95% CI: 1.3 - 19;p = 0.01). Conclusion: HE is a common complication during cirrhosis with a poor prognosis. In the majority of cases, a precipitating factor could be determined.

关键词： Hepatic Encephalopathy Liver Cirrhosis West Haven Criteria Child-Pugh Cameroon

Prevalence and Factors Associated with Hepatic Steatosis in Patients with Metabolic Syndrome in Cameroon: Cases of 4 Reference Hospitals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Gastroenterology 2023年第3期13卷 99-110页

作者： Winnie Tatiana Bekolo Nga Martine Claude Etoa Bidjogo Gwet Marina Servais A. F. Eloumou Bagnaka Antonin Wilson Ndjitoyap Ndam Agnès Malongue Mathurin Kowo Christian Tzeuton Dominique Noah Noah Oudou njoya Firmin Ankouane Andoulo Luma H. Namme Department of Internal Medicine General Hospital of Douala Douala Cameroon Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon National Obesity Centre Central Hospital of Yaoundé Yaoundé Cameroon Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon Department of Internal Medicine Gynecologic and Pediatric Hospital of Douala Douala Cameroon Department of Internal Medicine Teaching Hospital of Yaoundé Yaoundé Cameroon Clinic of Capucines Douala Cameroon

Introduction: Nonalcoholic fatty liver disease (NAFLD) is the leading cause of chronic liver disease worldwide and its prevalence increases with that of metabolic syndrome and its components. NAFLD is associated with complications such as cirrhosis and hepatocellular carcinoma. Diagnosis is mainly based on liver biopsy, but there are validated non-invasive methods. The purpose of the study was to assess the impact of metabolic steatopathy in patients with metabolic syndrome in Cameroon. Methods: This was a cross-sectional and analytical study conducted over a 6-month period from January 1st, 2019, to August 31st, 2022. Included were patients with metabolic syndrome who had consulted in endocrinology or gastroenterology at Yaoundé Central Hospital, Douala General Hospital and Douala Gyneco-obstetric and Pediatric Hospital. The diagnosis of NAFLD was made on abdominal ultrasound in front of a homogeneous or heterogeneous hyperechogenic aspect of the hepatic parenchyma compared to that of the right renal cortex called “brilliant liver” and fibrosis evaluated through non-invasive scores (Fib4 and NALFD Fibrosis score). Logistic regression by a uni- and multivariate analysis made it possible to search for the associated factors. Results. We included 133 patients. The female sex represented 64.7%. The mean age was 55 ± 9 years. The prevalence of NAFLD was 48.9%. At the evaluation of fibrosis was significant according to FIB-4 and NAFLD fibrosis score respectively in 6.2% and 4.6% of cases. The independently associated factors were Triglyceridemia ≤ 1.5 g/l (OR = 0.33;95% CI [0.11 - 0.95];p = 0.04) and LDL hypercholesterolemia (OR = 2.94;95% CI [1.07 - 8.11];p = 0.036). Conclusion: NAFLD was present in almost half of patients with metabolic syndrome. We had very few patients with significant fibrosis, but it needs to be further evaluated. The associated factors are hypertriglyceridemia and LDL hypercholesterolemia.

关键词： Hepatic Steatosis Metabolic Syndrome Prevalence Cameroon

Indications, Yield and Outcome of Colonoscopy: A 7-Year Retrospective Study in a Resource-Limited Setting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Gastroenterology 2019年第3期9卷 49-58页

作者： Gabin Ulrich Kenfack Servais Albert Fiacre Bagnaka Eloumou Winnie Tatiana Bekolo Nga Guy Sadeu Wafeu Paul Nkemtendong Tolefac Agnès Malongue Mathurin Pierre Kowo Christian Tzeuton Firmin Ankouane Andoulo Oudou njoya Henry Namme Luma Dominique Noah Noah Faculty of Medicine and Biomedical Sciences The University of Yaoundé I Yaoundé Cameroon Research Laboratory on Viral Hepatitis and Health Communication Yaoundé Cameroon Faculty of Medicine and Pharmaceutical Sciences The University of Douala Douala Cameroon Internal Medicine Unit Douala General Hospital Douala Cameroon “Les Capucines” Medical Center Douala Cameroon Deido District Hospital Douala Cameroon

Background and Aims: Diagnostic colonoscopy allows exploration of the colonic mucosa. Indications are multiple. The purpose of this work was to describe the indications and to report the lesions observed during colonoscopy at the General Hospital of Douala. Methods: This was a cross-sectional study with retrospective data collection over a period of 7 years (January 1, 2010 to January 31, 2017). The data collected from the reports were socio-demographic characteristics, indications and lesions observed at colonoscopy. Binary logistic regression allowed us to identify the independent risk factors associated with the presence of tumors and polyps. Results: We included 719 exams. The main indications were rectorrhagia (29.5%), abdominal pain (25.9%) and constipation (17.8%). A colonic lesion was found in 60.1% of cases. A colorectal tumor accounted for 10.3% of cases. Factors independently associated with colonic tumor were complete colonoscopy (aOR: 0.167 95% CI [0.096 - 0.289], p Conclusion: The presence of weight loss, abdominal or rectal mass should motivate the realization of a complete colonoscopy in search of a colorectal tumor. The most observed lesions remain hemorrhoids, polyps and diverticulosis of the colon.

关键词： Colonoscopy Indications Colorectal Tumor Limited Resources Cameroon

Diagnosis of Helicobacter pylori Infection in Low Out-Outcome Country: Rapid Urease Test, Serological Test, versus Direct Microbiological Examination with Gram Stain

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Gastroenterology 2023年第6期13卷 199-208页

作者： Winnie Tatiana Bekolo Nga Guy Roger Nsenga Djapa Kelly Ilinga Meme Mamende Antonin Wilson Ndjitoyap Ndam David Sepo Sepo Agnès Malongue Firmin Ankouane Andoulo Oudou njoya Henry Luma Namme Elie Claude Ndjitoyap Ndam Carole Else Eboumbou Servais Albert Fiacre Eloumou Bagnaka Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Medecine Douala General Hospital Douala Cameroon Faculty of Medicine and Pharmaceutical Sciences University of Dschang Dschang Cameroon Faculty of Medicine and Biomedical Sciences University of Yaounde I Yaounde Cameroon Department of Internal Medecine Douala Military Hospital Douala Cameroon

Introduction: Helicobacter pylori is a gram-negative bacillus responsible for numerous gastroduodenal pathologies, and this infection is a public health problem. The prevalence of infection with this bacterium remains high in countries with limited resources. Diagnosis relies mainly on numerous invasive and noninvasive methods. The aim of this work was to evaluate the different indirect diagnostic methods using bacterial cultures. Methods: We conducted a cross-sectional and analytical study from January to May 2022 in the gastroenterology departments of Douala General Hospital and Douala Military Hospital. All patients aged 18 years and older who were in the gastroenterology consultation and agreed to participate were included in our study. Sociodemographic, clinical, and paraclinical data were collected. Urease, liquid urea, and culture tests were performed from the specimens obtained by fibroscopy. Serological tests were performed on the blood sample. Results: 101 patients were included, 58 were female and 43 were male, for a sex ratio of 1.3. The mean age was 44.2 ± 16 years. The prevalence of infection was 90.5%, 44.1%, 40.6% and 21.8% for serology, direct microbiological examination, RUT (rapid urea test) and culture, respectively. Comparison of the different tests showed sensitivity and specificity of 67.1% and 64%, respectively, for RUT, 100% and 73.7%, respectively, for direct microbiological examination, and 100% and 14.8%, respectively, for serology. The positive and negative predictive values were 39.5% and 100% for serology, 39% and 85% for RUT, and 55.6% and 100% for direct microbiological examination, respectively. Conclusion: The prevalence of Helicobacter pylori infection depends on the type of test used. Direct examination is more reliable than RUT and serology.

关键词： Helicobacter pylori Diagnostic Tests Sensitivity Specificity Positive and Negative Predictive Value

Bacteriological and Physicochemical Quality of Groundwater of Mbankomo Municipality(Center Region,Cameroon)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(B) 2023年第3期12卷 115-127页

作者： Murielle Patricia Mabou Tokam Antoine Tamsa Arfao Fils Mamert Onana Ernest Koji Vanelle Lontchi Segnou Yves Poutoum Yogne Awawou Manouore njoya Ornel Kadji Tchantcha Ahmadou Fadimatou Sylvie Chinche Belengfe Edith Brunelle Mouafo Tamnou Moïse Nola Department of Animal Biology and Physiology Faculty of ScienceUniversity of DoualaDouala 24157Cameroon Hydrobiology and Environment Laboratory University of Yaounde 1Faculty of SciencesYaounde 812Cameroon Laboratoire d’Application et d’Analyses Médicales Institut Supérieur des Sciences et Techniques de la Santéet du Management de GarouaBP.51 GarouaCameroun Department of Aquatic Ecosystems Management Institute of Fisheries and Aquatic SciencesUniversity of DoualaDoualaCameroon Laboratory S3MN2E Faculty of SciencesMohammed-V University RabatAv.Ibn-BattoutaRabatMorocco 8007.N.U.North Africa Department of Fisheries and Aquatic Resources Management Faculty of Agriculture and Veterinary MedicineUniversity of BueaBuéa 63Cameroon

A study to evaluate the physico-chemical and bacteriological quality of groundwater was carried out in the commune of Mbankomo(Centre-Cameroon)at 4 wells and 4 springs during the period from March to *** physico-chemical parameters were measured by the standard *** bacteria of fecal contamination,namely HAB(Heterotrophic Aerobic Bacteria),total and faecal coliforms(Escherichia coli),and faecal streptococci were isolated by the surface spreading technique on PCA(Plate Count Agar),Endo and BEA(Bile Esculin Azide)agar respectively,and sulphite-reducing clostridia by the incorporation method on Tryptone Sulfite Cycloserine(TSC)*** a physico-chemical point of view,the groundwater in Mbamkomo is characterized by an average temperature(24.24±0.24°C);it is polluted with organic matter,acid and poorly *** was noted from a bacteriological point of view that these waters have a high and varied bacterial load with an average value of 100.8 × 10^(5) CFU/100 mL for coliforms,16.3 × 10^(5) CFU/100 mL for fecal streptococci,5.6 × 10^(5) CFU/100 mL for Escherichia coli and 4.8 ×10^(²)CFU/100 mL for Clostridium *** concentrations are all higher than the WHO(World Health Organization)standards which are set at 0 CFU/100 mL for coliforms,fecal streptococci and Clostridium perfringens and indicate fecal pollution of these *** coli cell densities were significantly correlated with dissolved oxygen in the water(r=0.510;p<0.05).The degradation of the quality of these waters is favored by their proximity to pollution sources,poor maintenance and poor protection of the *** waters,without any treatment,are not recommended for human consumption according to the standards of the WHO.

关键词： Groundwater physico-chemical quality bacteriological quality.

Search for two-neutrino double-beta decay of^(136)Xe to the 0^(+)_(1)excited state of 136Ba with the complete EXO-200 dataset

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2023年第10期47卷 1-9页

作者： S.Al Kharusi G.Anton I.Badhrees P.S.Barbeau D.Beck V.Belov T.Bhatta M.Breidenbach T.Brunner G.F.Cao W.R.Cen C.Chambers B.Cleveland M.Coon A.Craycraft T.Daniels L.Darroch S.J.Daugherty J.Davis S.Delaquis A.Der Mesrobian-Kabakian R.DeVoe J.Dilling A.Dolgolenko M.J.Dolinski J.Echevers W.Fairbank Jr. D.Fairbank J.Farine S.Feyzbakhsh P.Fierlinger Y.S.Fu D.Fudenberg P.Gautam R.Gornea G.Gratta C.Hall E.V.Hansen J.Hoessl P.Hufschmidt M.Hughes A.Iverson A.Jamil C.Jessiman M.J.Jewell A.Johnson A.Karelin L.J.Kaufman T.Koffas R.Krücken A.Kuchenkov K.S.Kumar Y.Lan A.Larson B.G.Lenardo D.S.Leonard G.S.Li S.Li Z.Li C.Licciardi Y.H.Lin R.MacLellan T.McElroy T.Michel B.Mong D.C.Moore K.Murray O.njoya O.Nusair A.Odian I.Ostrovskiy A.Perna A.Piepke A.Pocar F.Retière A.L.Robinson P.C.Rowson J.Runge S.Schmidt D.Sinclair K.Skarpaas A.K.Soma V.Stekhanov M.Tarka S.Thibado J.Todd T.Tolba T.I.Totev R.Tsang B.Veenstra V.Veeraraghavan P.Vogel J.-L.Vuilleumier M.Wagenpfeil J.Watkins M.Weber L.J.Wen U.Wichoski G.Wrede S.X.Wu Q.Xia D.R.Yahne L.Yang Y.-R.Yen O.Ya.Zeldovich T.Ziegler 无 Physics Department McGill UniversityMontrealQuebec H3A 2T8Canada Erlangen Centre for Astroparticle Physics(ECAP) Friedrich-Alexander-University Erlangen-NürnbergErlangen 91058Germany Physics Department Carleton UniversityOttawaOntario K1S 5B6Canada Department of Physics Duke Universityand Triangle Universities Nuclear Laboratory(TUNL)DurhamNorth Carolina 27708USA Physics Department University of IllinoisUrbana-ChampaignIllinois 61801USA Institute for Theoretical and Experimental Physics named by A.I.Alikhanov of National Research Centre“Kurchatov Institute” Moscow 117218Russia Department of Physics University of South DakotaVermillionSouth Dakota 57069USA SLAC National Accelerator Laboratory Menlo ParkCalifornia 94025USA TRIUMF VancouverBritish Columbia V6T 2A3Canada Institute of High Energy Physics Beijing 100049China Department of Physics Laurentian UniversitySudburyOntario P3E 2C6Canada Physics Department Colorado State UniversityFort CollinsColorado 80523USA Department of Physics and Physical Oceanography University of North Carolina at WilmingtonWilmingtonNC 28403USA Physics Department and CEEM Indiana UniversityBloomingtonIndiana 47405USA Physics Department Stanford UniversityStanfordCalifornia 94305USA Department of Physics Drexel UniversityPhiladelphiaPennsylvania 19104USA Amherst Center for Fundamental Interactions and Physics Department University of MassachusettsAmherstMA 01003USA Technische Universität München Physikdepartment and Excellence Cluster UniverseGarching 80805Germany Physics Department University of MarylandCollege ParkMaryland 20742USA Department of Physics and Astronomy University of AlabamaTuscaloosaAlabama 35487USA Wright Laboratory Department of PhysicsYale UniversityNew HavenConnecticut 06511USA IBS Center for Underground Physics Daejeon 34126Korea Department of Physics and Astronomy Stony Brook UniversitySUNYStony BrookNew York 11794USA Kellogg Lab CaltechPasadenaCalifornia 91125USA LHEP Albert Einstein CenterUniversi

A new search for two-neutrino double-beta(2νββ)decay of^(136)Xe to the 0+1 excited state of 136Ba is performed with the full EXO-200 dataset.A deep learning-based convolutional neural network is used to discriminate signal from background *** detection efficiency is increased relative to previous searches by EXO-200 by more than a factor of *** the addition of the Phase II dataset taken with an upgraded detector,the median 90%confidence level half-life sensitivity of 2νββdecay to the 0+1 state of 136Ba is 2.9×10^(24)yr using a total^(136)Xe exposure of 234.1 kg *** statistically significant evidence for 2νββdecay to the 0^(+)_(1)state is observed,leading to a lower limit of T2ν1/2(0^(+)→0^(+)_(1))>1.4×10^(24)yr at 90%confidence level,improved by 70%relative to the current world's best constraint.

关键词： EXO-200 experiment neutrinoless double beta decay excited state

Search for two-neutrino double-beta decay of 136Xe to the 01+excited state of136Ba with the complete EXO-200 dataset

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2023年第10期47卷 5-13页

作者： S.Al Kharusi G.Anton I.Badhrees P.S.Barbeau D.Beck V.Belov T.Bhatta M.Breidenbach T.Brunner G.F.Cao W.R.Cen C.Chambers B.Cleveland M.Coon A.Craycraft T.Daniels L.Darroch S.J.Daugherty J.Davis S.Delaquis A.Der Mesrobian-Kabakian R.De Voe J.Dilling A.Dolgolenko M.J.Dolinski J.Echevers W.Fairbank Jr. D.Fairbank J.Farine S.Feyzbakhsh P.Fierlinger Y.S.Fu D.Fudenberg P.Gautam R.Gornea G.Gratta C.Hall E.V.Hansen J.Hoessl P.Hufschmidt M.Hughes A.Iverson A.Jamil C.Jessiman M.J.Jewell A.Johnson A.Karelin L.J.Kaufman T.Koffas R.Krücken A.Kuchenkov K.S.Kumar Y.Lan A.Larson B.G.Lenardo D.S.Leonard G.S.Li S.Li Z.Li C.Licciardi Y.H.Lin R.Mac Lellan T.Mc Elroy T.Michel B.Mong D.C.Moore K.Murray O.njoya O.Nusair A.Odian I.Ostrovskiy A.Perna A.Piepke A.Pocar F.Retière A.L.Robinson P.C.Rowson J.Runge S.Schmidt D.Sinclair K.Skarpaas A.K.Soma V.Stekhanov M.Tarka S.Thibado J.Todd T.Tolba T.I.Totev R.Tsang B.Veenstra V.Veeraraghavan P.Vogel J.-L.Vuilleumier M.Wagenpfeil J.Watkins M.Weber L.J.Wen U.Wichoski G.Wrede S.X.Wu Q.Xia D.R.Yahne L.Yang Y.-R.Yen O.Ya.Zeldovich T.Ziegler EXO-200 Collaboration Physics Department McGill University Erlangen Centre for Astroparticle Physics (ECAP) Friedrich-Alexander-University Erlangen-Nürnberg Physics Department Carleton University King Abdulaziz City for Science and Technology Department of Physics Duke University and Triangle Universities Nuclear Laboratory (TUNL) Physics Department University of Illinois Institute for Theoretical and Experimental Physics named by A.I.Alikhanov of National Research Centre “Kurchatov Institute” a division of National Research Center “Kurchatov Institute” Department of Physics University of South Dakota Department of Physics and Astronomy University of Kentucky SLAC National Accelerator Laboratory TRIUMF Institute of High Energy Physics Witmem Technology Co. Ltd. Department of Physics Laurentian University Also at SNOLAB Physics Department Colorado State University Department of Physics and Physical Oceanography University of North Carolina at Wilmington Physics Department and CEEM Indiana University Carleton University Commissariat àl’Energie Atomique et auxénergies alternatives Physics Department Stanford University Department of Physics Drexel University University of California Amherst Center for Fundamental Interactions and Physics Department University of Massachusetts Technische Universit?t München Physikdepartment and Excellence Cluster Universe Qventus Department of Physics University of Virginia Physics Department University of Maryland Department of Physics at the University of California Department of Physics and Astronomy University of Alabama Wright Laboratory Department of Physics Yale University Department of Physics Princeton University IBS Center for Underground Physics Physics Department University of California SNOLAB Department of Physics and Astronomy Stony Brook University SUNY SCIPP University of California Institute for Experimental Physics Hamburg University Department of Physics and Astronomy Iowa State University Kellogg Lab Caltech LHEP Albert Einstein Center University of Ber

A new search for two-neutrino double-beta(2vββ) decay of136Xe to the 01+excited state of136Ba is performed with the full EXO-200 dataset.A deep learning-based convolutional neural network is used to discriminate signal from background *** detection efficiency is increased relative to previous searches by EXO-200 by more than a factor of *** the addition of the Phase Ⅱ dataset taken with an upgraded detector,the median 90%confidence level half-life sensitivity of 2vββ decay to the 01+state of136Ba is 2.9 × 1024yr using a total136Xe exposure of 234.1 kg *** statistically significant evidence for 2vββ decay to the 01+state is observed,leading to a lower limit of T1/22v(0+→01+)>1.4×1024yr at 90% confidence level,improved by 70% relative to the current world’s best constraint.

关键词： EXO-200 experiment neutrinoless double beta decay excited state