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Your search keyword '"Butikofer, L."' showing total 14 results
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14 results on '"Butikofer, L."'

1. Search for Electronic Recoil Event Rate Modulation with 4 Years of XENON100 Data

Author

The XENON collaboration, Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, B., Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calven, J., Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, J., Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Eurin, G., Fei, J., Ferella, A. D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Maris, I., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Pakarha, P., Pelssers, B., Persiani, R., Piastra, F., Pienaar, J., Pizzella, V., Piro, M. -C., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., Santos, J. M. F. dos, Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Silva, M., Simgen, H., Sivers, M. v., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C., Wang, H., Wei, Y., Weinheimer, C., Wulf, J., Ye, J., and Zhang, Y.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

We report on a search for electronic recoil event rate modulation signatures in the XENON100 data accumulated over a period of 4 years, from January 2010 to January 2014. A profile likelihood method, which incorporates the stability of the XENON100 detector and the known electronic recoil background model, is used to quantify the significance of periodicity in the time distribution of events. There is a weak modulation signature at a period of $431^{+16}_{-14}$ days in the low energy region of $(2.0-5.8)$ keV in the single scatter event sample, with a global significance of $1.9\,\sigma$, however no other more significant modulation is observed. The expected annual modulation of a dark matter signal is not compatible with this result. Single scatter events in the low energy region are thus used to exclude the DAMA/LIBRA annual modulation as being due to dark matter electron interactions via axial vector coupling at $5.7\,\sigma$., Comment: 6 pages, 5 figures

Published
2017
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2. Results from a Calibration of XENON100 Using a Source of Dissolved Radon-220

Author

The XENON Collaboration, Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, B., Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calven, J., Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, J., Cussonneau, J. P., Decowski, M. P., dePerio, P., DiGangi, P., DiGiovanni, A., Diglio, S., Duchovni, E., Eurin, G., Fei, J., Ferella, A. D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Grandi, L., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., LeCalloch, M., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Maris, I., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, B., Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., lante, G. P, Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., Saldanha, R., dosSantos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Shockley, E., Silva, M., Simgen, H., Sivers, M. v., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C., Upole, N., Wang, H., Wei, Y., Weinheimer, C., Wulf, J., Ye, J., and Zhang, Y.

Subjects
Physics - Instrumentation and Detectors
Abstract

A Rn-220 source is deployed on the XENON100 dark matter detector in order to address the challenges in calibration of tonne-scale liquid noble element detectors. We show that the Pb-212 beta emission can be used for low-energy electronic recoil calibration in searches for dark matter. The isotope spreads throughout the entire active region of the detector, and its activity naturally decays below background level within a week after the source is closed. We find no increase in the activity of the troublesome Rn-222 background after calibration. Alpha emitters are also distributed throughout the detector and facilitate calibration of its response to Rn-222. Using the delayed coincidence of Rn-220/Po-216, we map for the first time the convective motion of particles in the XENON100 detector. Additionally, we make a competitive measurement of the half-life of Po-212, t = 293.9+-(1.0)+-(0.6) ns.

Published
2016
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3. Comparison of Kaposi Sarcoma Risk in Human Immunodeficiency Virus-Positive Adults Across 5 Continents: A Multiregional Multicohort Study

Author

Rohner E., Butikofer L., Schmidlin K., Sengayi M., Maskew M., Giddy J., Garone D., Moore R. D., D'Souza G., Goedert J. J., Achenbach C., Gill M. J., Kitahata M. M., Patel P., Silverberg M. J., Castilho J., McGowan C., Chen Y. -M. A., Law M., Taylor N., Paparizos V., Bonnet F., Verbon A., Fatkenheuer G., Post F. A., Sabin C., Mocroft A., Le Moing V., Dronda F., Obel N., Grabar S., Spagnuolo V., Antinori A., Quiros-Roldan E., Mussini C., Miro J. M., Meyer L., Hasse B., Konopnicki D., Roca B., Barger D., Raben D., Clifford G. M., Franceschi S., Brockmeyer N., Chakraborty R., Egger M., Bohlius J., Judd A., Zangerle R., Touloumi G., Warszawski J., Dabis F., Krause M. M., Ghosn J., Leport C., Wittkop L., Reiss P., Wit F., Prins M., Bucher H., Gibb D., Del Amo J., Thorne C., Kirk O., Stephan C., Perez-Hoyos S., Hamouda O., Bartmeyer B., Chkhartishvili N., Noguera-Julian A., Monforte A. D., Prieto L., Conejo P. R., Soriano-Arandes A., Battegay M., Kouyos R., Tookey P., Casabona J., Castagna A., Konopnick D., Goetghebuer T., Sonnerborg A., Teira R., Garrido M., Haerry D., De Wit S., Costagliola D., D'Arminio-Monforte A., Chene G., Schwimmer C., Termote M., Campbell M., Frederiksen C. M., Friis-Moller N., Kjaer J., Brandt R. S., Berenguer J., Bouteloup V., Cozzi-Lepri A., Davies M. -A., Dorrucci M., Dunn D., Furrer H., Guiguet M., Lambotte O., Leroy V., Lodi S., Matheron S., Monge S., Nakagawa F., Paredes R., Phillips A., Puoti M., Schomaker M., Smit C., Sterne J., Thiebaut R., Torti C., Van Der Valk M., Tanser F., Vinikoor M., MacEte E., Wood R., Stinson K., Fatti G., Phiri S., Chimbetete C., Malisita K., Eley B., Fritz C., Hobbins M., Kamenova K., Fox M., Prozesky H., Technau K., Sawry S., Benson C. A., Bosch R. J., Kirk G. D., Boswell S., Mayer K. H., Grasso C., Hogg R. S., Harrigan P. R., Montaner J. S. G., Yip B., Zhu J., Salters K., Gabler K., Buchacz K., Brooks J. T., Gebo K. A., Carey J. T., Rodriguez B., Horberg M. A., Thorne J. E., Rabkin C., Margolick J. B., Jacobson L. P., Klein M. B., Rourke S. B., Rachlis A. R., Cupido P., Hunter-Mellado R. F., Mayor A. M., Deeks S. G., Martin J. N., Saag M. S., Mugavero M. J., Willig J., Eron J. J., Napravnik S., Crane H. M., Drozd D. R., Haas D., Rebeiro P., Turner M., Bebawy S., Rogers B., Justice A. C., Dubrow R., Fiellin D., Gange S. J., Anastos K., Althoff K. N., McKaig R. G., Freeman A. M., Lent C., Van Rompaey S. E., Morton L., McReynolds J., Lober W. B., Abraham A. G., Lau B., Zhang J., Jing J., Modur S., Wong C., Hogan B., Desir F., Liu B., You B., Cahn P., Cesar C., Fink V., Sued O., Dell'Isola E., Perez H., Valiente J., Yamamoto C., Grinsztejn B., Veloso V., Luz P., De Boni R., Wagner S. C., Friedman R., Moreira R., Pinto J., Ferreira F., Maia M., De Menezes Succi R. C., MacHado D. M., De Fatima Barbosa Gouvea A., Wolff M., Cortes C., Rodriguez M. F., Allendes G., Pape J. W., Rouzier V., Marcelin A., Perodin C., Luque M. T., Padgett D., Madero J. S., Ramirez B. C., Belaunzaran P., Vega Y. C., Gotuzzo E., Mejia F., Carriquiry G., McGowan C. C., Shepherd B. E., Sterling T., Jayathilake K., Person A. K., Rebeiro P. F., Giganti M., Duda S. N., Maruri F., Vansell H., Ly P. S., Khol V., Zhang F. J., Zhao H. X., Han N., Lee M. P., Li P. C. K., Lam W., Chan Y. T., Kumarasamy N., Saghayam S., Ezhilarasi C., Pujari S., Joshi K., Gaikwad S., Chitalikar A., Merati T. P., Wirawan D. N., Yuliana F., Yunihastuti E., Imran D., Widhani A., Tanuma J., Oka S., Nishijima T., Choi J. Y., Na S., Kim J. M., Sim B. L. H., Gani Y. M., David R., Kamarulzaman A., Syed Omar S. F., Ponnampalavanar S., Azwa I., Ditangco R., Uy E., Bantique R., Wong W. W., Ku W. W., Wu P. C., Ng O. T., Lim P. L., Lee L. S., Ohnmar P. S., Avihingsanon A., Gatechompol S., Phanuphak P., Phadungphon C., Kiertiburanakul S., Sungkanuparph S., Chumla L., Sanmeema N., Chaiwarith R., Sirisanthana T., Kotarathititum W., Praparattanapan J., Kantipong P., Kambua P., Ratanasuwan W., Sriondee R., Nguyen K. V., Bui H. V., Nguyen D. T. H., Nguyen D. T., Cuong D. D., An N. V., Luan N. T., Sohn A. H., Ross J. L., Petersen B., Cooper D. A., Law M. G., Jiamsakul A., Boettiger D. C., Ellis D., Bloch M., Agrawal S., Vincent T., Allen D., Smith D., Rankin A., Baker D., Templeton D. J., Jackson E., McCallum K., Ryder N., Sweeney G., Cooper D., Carr A., MacRae K., Hesse K., Finlayson R., Gupta S., Langton-Lockton J., Shakeshaft J., Brown K., Idle S., Arvela N., Varma R., Lu H., Couldwell D., Eswarappa S., Smith D. E., Furner V., Cabrera G., Fernando S., Cogle A., Lawrence C., Mulhall B., Boyd M., Petoumenos K., Puhr R., Huang R., Han A., Gunathilake M., Payne R., O'Sullivan M., Croydon A., Russell D., Cashman C., Roberts C., Sowden D., Taing K., Marshall P., Orth D., Youds D., Rowling D., Latch N., Warzywoda E., Dickson B., Donohue W., Moore R., Edwards S., Boyd S., Roth N. J., Lau H., Read T., Silvers J., Zeng W., Hoy J., Watson K., Bryant M., Price S., Woolley I., Giles M., Korman T., Williams J., Nolan D., Allen A., Guelfi G., Mills G., Wharry C., Raymond N., Bargh K., Templeton D., Medical Microbiology & Infectious Diseases, Global Health, Infectious diseases, APH - Aging & Later Life, AII - Infectious diseases, APH - Global Health, Graduate School, APH - Digital Health, APH - Personalized Medicine, Bohlius, Julia, Cohere In, Eurocoord, Castagna, Antonella, Rohner, E, Butikofer, L, Schmidlin, K, Sengayi, M, Maskew, M, Giddy, J, Garone, D, Moore, R, D'Souza, G, Goedert, J, Achenbach, C, Gill, M, Kitahata, M, Patel, P, Silverberg, M, Castilho, J, Mcgowan, C, Chen, Y, Law, M, Taylor, N, Paparizos, V, Bonnet, F, Verbon, A, Fatkenheuer, G, Post, F, Sabin, C, Mocroft, A, Le Moing, V, Dronda, F, Obel, N, Grabar, S, Spagnuolo, V, Antinori, A, Quiros-Roldan, E, Mussini, C, Miro, J, Meyer, L, Hasse, B, Konopnicki, D, Roca, B, Barger, D, Raben, D, Clifford, G, Franceschi, S, Brockmeyer, N, Chakraborty, R, Egger, M, Bohlius, J, Judd, A, Zangerle, R, Touloumi, G, Warszawski, J, Dabis, F, Krause, M, Ghosn, J, Leport, C, Wittkop, L, Reiss, P, Wit, F, Prins, M, Bucher, H, Gibb, D, Del Amo, J, Thorne, C, Kirk, O, Stephan, C, Perez-Hoyos, S, Hamouda, O, Bartmeyer, B, Chkhartishvili, N, Noguera-Julian, A, Monforte, A, Prieto, L, Conejo, P, Soriano-Arandes, A, Battegay, M, Kouyos, R, Tookey, P, Casabona, J, Castagna, A, Konopnick, D, Goetghebuer, T, Sonnerborg, A, Teira, R, Garrido, M, Haerry, D, De Wit, S, Costagliola, D, D'Arminio-Monforte, A, Chene, G, Schwimmer, C, Termote, M, Campbell, M, Frederiksen, C, Friis-Moller, N, Kjaer, J, Brandt, R, Berenguer, J, Bouteloup, V, Cozzi-Lepri, A, Davies, M, Dorrucci, M, Dunn, D, Furrer, H, Guiguet, M, Lambotte, O, Leroy, V, Lodi, S, Matheron, S, Monge, S, Nakagawa, F, Paredes, R, Phillips, A, Puoti, M, Schomaker, M, Smit, C, Sterne, J, Thiebaut, R, Torti, C, Van Der Valk, M, Tanser, F, Vinikoor, M, Macete, E, Wood, R, Stinson, K, Fatti, G, Phiri, S, Chimbetete, C, Malisita, K, Eley, B, Fritz, C, Hobbins, M, Kamenova, K, Fox, M, Prozesky, H, Technau, K, Sawry, S, Benson, C, Bosch, R, Kirk, G, Boswell, S, Mayer, K, Grasso, C, Hogg, R, Harrigan, P, Montaner, J, Yip, B, Zhu, J, Salters, K, Gabler, K, Buchacz, K, Brooks, J, Gebo, K, Carey, J, Rodriguez, B, Horberg, M, Thorne, J, Rabkin, C, Margolick, J, Jacobson, L, Klein, M, Rourke, S, Rachlis, A, Cupido, P, Hunter-Mellado, R, Mayor, A, Deeks, S, Martin, J, Saag, M, Mugavero, M, Willig, J, Eron, J, Napravnik, S, Crane, H, Drozd, D, Haas, D, Rebeiro, P, Turner, M, Bebawy, S, Rogers, B, Justice, A, Dubrow, R, Fiellin, D, Gange, S, Anastos, K, Althoff, K, Mckaig, R, Freeman, A, Lent, C, Van Rompaey, S, Morton, L, Mcreynolds, J, Lober, W, Abraham, A, Lau, B, Zhang, J, Jing, J, Modur, S, Wong, C, Hogan, B, Desir, F, Liu, B, You, B, Cahn, P, Cesar, C, Fink, V, Sued, O, Dell'Isola, E, Perez, H, Valiente, J, Yamamoto, C, Grinsztejn, B, Veloso, V, Luz, P, De Boni, R, Wagner, S, Friedman, R, Moreira, R, Pinto, J, Ferreira, F, Maia, M, De Menezes Succi, R, Machado, D, De Fatima Barbosa Gouvea, A, Wolff, M, Cortes, C, Rodriguez, M, Allendes, G, Pape, J, Rouzier, V, Marcelin, A, Perodin, C, Luque, M, Padgett, D, Madero, J, Ramirez, B, Belaunzaran, P, Vega, Y, Gotuzzo, E, Mejia, F, Carriquiry, G, Shepherd, B, Sterling, T, Jayathilake, K, Person, A, Giganti, M, Duda, S, Maruri, F, Vansell, H, Ly, P, Khol, V, Zhang, F, Zhao, H, Han, N, Lee, M, Li, P, Lam, W, Chan, Y, Kumarasamy, N, Saghayam, S, Ezhilarasi, C, Pujari, S, Joshi, K, Gaikwad, S, Chitalikar, A, Merati, T, Wirawan, D, Yuliana, F, Yunihastuti, E, Imran, D, Widhani, A, Tanuma, J, Oka, S, Nishijima, T, Choi, J, Na, S, Kim, J, Sim, B, Gani, Y, David, R, Kamarulzaman, A, Syed Omar, S, Ponnampalavanar, S, Azwa, I, Ditangco, R, Uy, E, Bantique, R, Wong, W, Ku, W, Wu, P, Ng, O, Lim, P, Lee, L, Ohnmar, P, Avihingsanon, A, Gatechompol, S, Phanuphak, P, Phadungphon, C, Kiertiburanakul, S, Sungkanuparph, S, Chumla, L, Sanmeema, N, Chaiwarith, R, Sirisanthana, T, Kotarathititum, W, Praparattanapan, J, Kantipong, P, Kambua, P, Ratanasuwan, W, Sriondee, R, Nguyen, K, Bui, H, Nguyen, D, Cuong, D, An, N, Luan, N, Sohn, A, Ross, J, Petersen, B, Cooper, D, Jiamsakul, A, Boettiger, D, Ellis, D, Bloch, M, Agrawal, S, Vincent, T, Allen, D, Smith, D, Rankin, A, Baker, D, Templeton, D, Jackson, E, Mccallum, K, Ryder, N, Sweeney, G, Carr, A, Macrae, K, Hesse, K, Finlayson, R, Gupta, S, Langton-Lockton, J, Shakeshaft, J, Brown, K, Idle, S, Arvela, N, Varma, R, Lu, H, Couldwell, D, Eswarappa, S, Furner, V, Cabrera, G, Fernando, S, Cogle, A, Lawrence, C, Mulhall, B, Boyd, M, Petoumenos, K, Puhr, R, Huang, R, Han, A, Gunathilake, M, Payne, R, O'Sullivan, M, Croydon, A, Russell, D, Cashman, C, Roberts, C, Sowden, D, Taing, K, Marshall, P, Orth, D, Youds, D, Rowling, D, Latch, N, Warzywoda, E, Dickson, B, Donohue, W, Edwards, S, Boyd, S, Roth, N, Lau, H, Read, T, Silvers, J, Zeng, W, Hoy, J, Watson, K, Bryant, M, Price, S, Woolley, I, Giles, M, Korman, T, Williams, J, Nolan, D, Allen, A, Guelfi, G, Mills, G, Wharry, C, Raymond, N, and Bargh, K

Subjects
Male, viruses, HIV Infections, Men who have sex with men, Cohort Studies, 0302 clinical medicine, Risk Factors, Antiretroviral therapy, Cohort study, HIV, Kaposi sarcoma, Adolescent, Adult, Anti-Retroviral Agents, CD4 Lymphocyte Count, Female, HIV-1, Humans, Middle Aged, Sarcoma, Kaposi, Viral Load, Young Adult, 030212 general & internal medicine, Articles and Commentaries, Incidence (epidemiology), Hazard ratio, virus diseases, Sarcoma, 3. Good health, Infectious Diseases, 030220 oncology & carcinogenesis, Cohort, Coinfection, Microbiology (medical), antiretroviral therapy, 610 Medicine & health, Kaposi, 03 medical and health sciences, SDG 3 - Good Health and Well-being, 360 Social problems & social services, medicine, cohort study, business.industry, medicine.disease, Confidence interval, business, Demography
Abstract

Background We compared Kaposi sarcoma (KS) risk in adults who started antiretroviral therapy (ART) across the Asia-Pacific, South Africa, Europe, Latin, and North America. Methods We included cohort data of human immunodeficiency virus (HIV)-positive adults who started ART after 1995 within the framework of 2 large collaborations of observational HIV cohorts. We present incidence rates and adjusted hazard ratios (aHRs). Results We included 208140 patients from 57 countries. Over a period of 1066572 person-years, 2046 KS cases were diagnosed. KS incidence rates per 100000 person-years were 52 in the Asia-Pacific and ranged between 180 and 280 in the other regions. KS risk was 5 times higher in South African women (aHR, 4.56; 95% confidence intervals [CI], 2.73-7.62) than in their European counterparts, and 2 times higher in South African men (2.21; 1.34-3.63). In Europe, Latin, and North America KS risk was 6 times higher in men who have sex with men (aHR, 5.95; 95% CI, 5.09-6.96) than in women. Comparing patients with current CD4 cell counts ≥700 cells/µL with those whose counts were

Published
2017
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4. Non-Hodgkin lymphoma risk in adults living with HIV across five continents The AIDS-defining Cancer Project Working Group of leDEA and COHERE in EuroCoord

Author

Rohner, E, Butikofer, L, Schmidlin, K, Sengayi, M, Maskew, M, Giddy, J, Moore, RD, Goedert, JJ, Gill, MJ, Silverberg, MJ, Patel, P, Castilho, J, Hoy, J, Sohn, A, Bani-Sadr, F, Taylor, N, Paparizos, V, Le Moing, V, Bonnet, F, Verbon, Annelies, Vehreschild, J J, Post, FA, Sabin, C, Mocroft, A, Dronda, F, Obel, N, Grabar, S, Spagnuolo, V, Antinori, A, Quiros-Rol-Dan, E, Mussini, C, Miro, JM, Meyer, L, Hasse, B, Konopnicki, D, Roca, B, Boue, F, Barger, D, Raben, D, Clifford, GM, Franceschi, S, Brockmeyer, N, Egger, M, Bohlius, J, and Medical Microbiology & Infectious Diseases

Subjects
SDG 3 - Good Health and Well-being, antiretroviral therapy, cohort study, HIV, incidence rates, non-Hodgkin lymphoma
Published
2018

5. Search for two-neutrino double electron capture of Xe-124 with XENON100

Author

Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calvén, Jakob, Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., De Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Duchovni, E., Fei, J., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Levy, C., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Silva, M., Simgen, H., Sivers, M. V., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C. D., Wall, R., Wang, H., Weber, M., Wei, Y., Weinheimer, C., Wulf, J., Zhang, Y., Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calvén, Jakob, Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., De Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Duchovni, E., Fei, J., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Levy, C., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Silva, M., Simgen, H., Sivers, M. V., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C. D., Wall, R., Wang, H., Weber, M., Wei, Y., Weinheimer, C., Wulf, J., and Zhang, Y.

Abstract

Two-neutrino double electron capture is a rare nuclear decay where two electrons are simultaneously captured from the atomic shell. For Xe-124 this process has not yet been observed and its detection would provide a new reference for nuclear matrix element calculations. We have conducted a search for two-neutrino double electron capture from the K shell of 124Xe using 7636 kg d of data from the XENON100 dark matter detector. Using a Bayesian analysis we observed no significant excess above background, leading to a lower 90% credibility limit on the half-life T-1/2 > 6.5 x 10(20) yr. We have also evaluated the sensitivity of the XENON1T experiment, which is currently being commissioned, and found a sensitivity of T-1/2 > 6.1 x 10(22) yr after an exposure of 2 t yr.

Published
2017
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6. Results from a calibration of XENON100 using a source of dissolved radon-220

Author

Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calven, Jakob, Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Duchovni, E., Eurin, G., Fei, J., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Grandi, L., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Maris, I., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., Saldanha, R., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Shockley, E., Silva, M., Simgen, H., v Sivers, M., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C., Upole, N., Wang, H., Wei, Y., Weinheimer, C., Wulf, J., Ye, J., Zhang, Y., Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calven, Jakob, Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Duchovni, E., Eurin, G., Fei, J., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Grandi, L., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Maris, I., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., Saldanha, R., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Shockley, E., Silva, M., Simgen, H., v Sivers, M., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C., Upole, N., Wang, H., Wei, Y., Weinheimer, C., Wulf, J., Ye, J., and Zhang, Y.

Abstract

A Rn-220 source is deployed on the XENON100 dark matter detector in order to address the challenges in calibration of tonne-scale liquid noble element detectors. We show that the Pb-212 beta emission can be used for low-energy electronic recoil calibration in searches for dark matter. The isotope spreads throughout the entire active region of the detector, and its activity naturally decays below background level within a week after the source is closed. We find no increase in the activity of the troublesome Rn-222 background after calibration. Alpha emitters are also distributed throughout the detector and facilitate calibration of its response to Rn-222. Using the delayed coincidence of Rn-220-Po-216, we map for the first time the convective motion of particles in the XENON100 detector. Additionally, we make a competitive measurement of the half-life of Po-212, t(1/2) = (293.9 +/- (1.0)(stat) +/- (0.6)(sys)) ns.

Published
2017
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7. Online Rn-222 removal by cryogenic distillation in the XENON100 experiment

Author

Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calvén, Jakob, Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Duchovni, E., Eurin, G., Fei, J., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Grandi, L., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Maris, I., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., Pizzella, V., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., Saldanha, R., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Shockley, E., Silva, M., Simgen, H., von Sivers, M., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C., Upole, N., Wang, H., Wei, Y., Weinheimer, C., Wulf, J., Ye, J., Zhang, Y., Cristescu, I., Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calvén, Jakob, Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Duchovni, E., Eurin, G., Fei, J., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Grandi, L., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Maris, I., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., Pizzella, V., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., Saldanha, R., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Shockley, E., Silva, M., Simgen, H., von Sivers, M., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C., Upole, N., Wang, H., Wei, Y., Weinheimer, C., Wulf, J., Ye, J., Zhang, Y., and Cristescu, I.

Abstract

We describe the purification of xenon from traces of the radioactive noble gas radon using a cryogenic distillation column. The distillation column was integrated into the gas purification loop of the XENON100 detector for online radon removal. This enabled us to significantly reduce the constant Rn-222 background originating from radon emanation. After inserting an auxiliary 222Rn emanation source in the gas loop, we determined a radon reduction factor of R > 27 (95% C.L.) for the distillation column by monitoring the Rn-222 activity concentration inside the XENON100 detector.

Published
2017
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8. DARWIN : towards the ultimate dark matter detector

Author

Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Amsler, C., Aprile, E., Arazi, L., Arneodo, F., Barrow, P., Baudis, L., Benabderrahmane, M. L., Berger, T., Beskers, B., Breskin, A., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calvén, Jakob, Cardoso, J. M. R., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., Diglio, S., Drexlin, G., Duchovni, E., Erdal, E., Eurin, G., Ferella, Alfredo, Fieguth, A., Fulgione, W., Rosso, A. Gallo, Di Gangi, P., Di Giovanni, A., Galloway, M., Garbini, M., Geis, C., Glueck, F., Grandi, L., Greene, Z., Grignon, C., Hasterok, C., Hannen, V., Hogenbirk, E., Howlett, J., Hilk, D., Hils, C., James, A., Kaminsky, B., Kazama, S., Kilminster, B., Kish, A., Krauss, L. M., Landsman, H., Lang, R. F., Lin, Q., Linde, F. L., Lindemann, S., Lindner, M., Lopes, J. A. M., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Mayani, D., Messina, M., Micheneau, K., Molinario, A., Morå, Knut D., Morteau, E., Murra, M., Naganoma, J., Newstead, J. L., Ni, K., Oberlack, U., Pakarha, P., Pelssers, Bart, de Perio, P., Persiani, R., Piastra, F., Piro, M. C., Plante, G., Rauch, L., Reichard, S., Rizzo, A., Rupp, N., Dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schumann, M., Schreiner, J., Lavina, L. Scotto, Selvi, M., Shagin, P., Silva, M. C., Simgen, H., Sissol, P., von Sivers, M., Thers, D., Thum, J., Tiseni, A., Trotta, R., Tunnell, C. D., Valerius, K., Vargas, M. A., Wang, H., Wei, Y., Weinheimer, C., Wester, T., Wulf, J., Zhang, Y., Zhu, T., Zuber, K., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Amsler, C., Aprile, E., Arazi, L., Arneodo, F., Barrow, P., Baudis, L., Benabderrahmane, M. L., Berger, T., Beskers, B., Breskin, A., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calvén, Jakob, Cardoso, J. M. R., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., Diglio, S., Drexlin, G., Duchovni, E., Erdal, E., Eurin, G., Ferella, Alfredo, Fieguth, A., Fulgione, W., Rosso, A. Gallo, Di Gangi, P., Di Giovanni, A., Galloway, M., Garbini, M., Geis, C., Glueck, F., Grandi, L., Greene, Z., Grignon, C., Hasterok, C., Hannen, V., Hogenbirk, E., Howlett, J., Hilk, D., Hils, C., James, A., Kaminsky, B., Kazama, S., Kilminster, B., Kish, A., Krauss, L. M., Landsman, H., Lang, R. F., Lin, Q., Linde, F. L., Lindemann, S., Lindner, M., Lopes, J. A. M., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Mayani, D., Messina, M., Micheneau, K., Molinario, A., Morå, Knut D., Morteau, E., Murra, M., Naganoma, J., Newstead, J. L., Ni, K., Oberlack, U., Pakarha, P., Pelssers, Bart, de Perio, P., Persiani, R., Piastra, F., Piro, M. C., Plante, G., Rauch, L., Reichard, S., Rizzo, A., Rupp, N., Dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schumann, M., Schreiner, J., Lavina, L. Scotto, Selvi, M., Shagin, P., Silva, M. C., Simgen, H., Sissol, P., von Sivers, M., Thers, D., Thum, J., Tiseni, A., Trotta, R., Tunnell, C. D., Valerius, K., Vargas, M. A., Wang, H., Wei, Y., Weinheimer, C., Wester, T., Wulf, J., Zhang, Y., Zhu, T., and Zuber, K.

Abstract

DARk matter WImp search with liquid xenoN (DARWIN(2)) will be an experiment for the direct detection of dark matter using a multi-ton liquid xenon time projection chamber at its core. Its primary goal will be to explore the experimentally accessible parameter space for Weakly Interacting Massive Particles (WIMPs) in a wide mass-range, until neutrino interactions with the target become an irreducible background. The prompt scintillation light and the charge signals induced by particle interactions in the xenon will be observed by VUV sensitive, ultra-low background photosensors. Besides its excellent sensitivity to WIMPs above a mass of 5 GeV/c(2), such a detector with its large mass, low-energy threshold and ultra-low background level will also be sensitive to other rare interactions. It will search for solar axions,galactic axion-like particles and the neutrinoless double-beta decay of Xe-136, as well as measure the low-energy solar neutrino flux with <1% precision, observe coherent neutrino-nucleus interactions, and detect galactic supernovae. We present the concept of the DARWIN detector and discuss its physics reach, the main sources of backgrounds and the ongoing detector design and R&D efforts.

Published
2016
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9. Low-mass dark matter search using ionization signals in XENON100

Author

Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Buss, A., Butikofer, L., Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Duchovni, E., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Galloway, M., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Gross, E., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Levinson, L., Le Calloch, M., Levy, C., Linde, F., Lindemann, S., Lindner, M., Lopes, J. A. M., Lyashenko, A., Manfredini, A., Undagoitia, T. Marrodn, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Fernandez, A. J. Melgarejo, Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Simgen, H., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C. D., von Sivers, M., Wall, R., Wang, H., Weber, M., Wei, Y., Weinheimer, C., Wulf, J., Zhang, Y., Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Buss, A., Butikofer, L., Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Duchovni, E., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Galloway, M., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Gross, E., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Levinson, L., Le Calloch, M., Levy, C., Linde, F., Lindemann, S., Lindner, M., Lopes, J. A. M., Lyashenko, A., Manfredini, A., Undagoitia, T. Marrodn, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Fernandez, A. J. Melgarejo, Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Simgen, H., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C. D., von Sivers, M., Wall, R., Wang, H., Weber, M., Wei, Y., Weinheimer, C., Wulf, J., and Zhang, Y.

Abstract

We perform a low-mass dark matter search using an exposure of 30 kg x yr with the XENON100 detector. By dropping the requirement of a scintillation signal and using only the ionization signal to determine the interaction energy, we lowered the energy threshold for detection to 0.7 keV for nuclear recoils. No dark matter detection can be claimed because a complete background model cannot be constructed without a primary scintillation signal. Instead, we compute an upper limit on the WIMP-nucleon scattering cross section under the assumption that every event passing our selection criteria could be a signal event. Using an energy interval from 0.7 keV to 9.1 keV, we derive a limit on the spin-independent WIMP-nucleon cross section that excludes WIMPs with a mass of 6 GeV/c(2) above 1.4 x 10(-41) cm(2) at 90% confidence level.

Published
2016
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10. Physics reach of the XENON1T dark matter experiment

Author

Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arazi, L., Arneodo, F., Balan, C., Barrow, P., Baudis, L., Bauermeister, Boris, Berger, T., Breur, P., Breskin, A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Contreras, H., Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Duchovni, E., Fattori, S., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Galloway, M., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Gross, E., Hampel, W., Hasterok, C., Itay, R., Kaether, F., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Levy, C., Lindemann, S., Lindner, M., Lopes, J. A. M., Lyashenko, A., Macmullin, S., Manfredini, A., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Mayani, D., Fernandez, A. J. Melgarejo, Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Simgen, H., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C., von Sivers, M., Wall, R., Wang, H., Weber, M., Wei, Y., Weinheimer, C., Wulf, J., Zhang, Y., Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arazi, L., Arneodo, F., Balan, C., Barrow, P., Baudis, L., Bauermeister, Boris, Berger, T., Breur, P., Breskin, A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, Jan, Contreras, H., Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Duchovni, E., Fattori, S., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Galloway, M., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Gross, E., Hampel, W., Hasterok, C., Itay, R., Kaether, F., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Levy, C., Lindemann, S., Lindner, M., Lopes, J. A. M., Lyashenko, A., Macmullin, S., Manfredini, A., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Mayani, D., Fernandez, A. J. Melgarejo, Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Simgen, H., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C., von Sivers, M., Wall, R., Wang, H., Weber, M., Wei, Y., Weinheimer, C., Wulf, J., and Zhang, Y.

Abstract

The XENON1T experiment is currently in the commissioning phase at the Laboratori Nazionali del Gran Sasso, Italy. In this article we study the experiment's expected sensitivity to the spin-independent WIMP-nucleon interaction cross section, based on Monte Carlo predictions of the electronic and nuclear recoil backgrounds. The total electronic recoil background in 1 tonne fiducial volume and (1, 12) keV electronic recoil equivalent energy region, before applying any selection to discriminate between electronic and nuclear recoils, is (1.80+/-0.15) . 10(-4) (kg.day.keV)(-1), mainly due to the decay of Rn-222 daughters inside the xenon target. The nuclear recoil background in the corresponding nuclear recoil equivalent energy region (4, 50) keV, is composed of (0.6 +/- 0.1) (t.y)(-1) from radiogenic neutrons, (1.8+/-0.3) . 10(-2) (t.y)(-1) from coherent scattering of neutrinos, and less than 0.01 (t.y)(-1) from muon-induced neutrons. The sensitivity of XENON1T is calculated with the Pro file Likelihood Ratio method, after converting the deposited energy of electronic and nuclear recoils into the scintillation and ionization signals seen in the detector. We take into account the systematic uncertainties on the photon and electron emission model, and on the estimation of the backgrounds, treated as nuisance parameters. The main contribution comes from the relative scintillation efficiency L-eff, which affects both the signal from WIMPs and the nuclear recoil backgrounds. After a 2 y measurement in 1 tonne fiducial volume, the sensitivity reaches a minimum cross section of 1.6 . 10(-47) cm(2) at m(chi) = 50 GeV/c(2).

Published
2016
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11. XENON100 dark matter results from a combination of 477 live days

Author

Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calvén, Jakob, Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, J., Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Duchovni, E., Fei, J., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Levy, C., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Silva, M., Simgen, H., Sivers, M. v., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C. D., Wall, R., Wang, H., Weber, M., Wei, Y., Weinheimer, C., Wulf, J., Zhang, Y., Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Amaro, F. D., Anthony, M., Arneodo, F., Barrow, P., Baudis, L., Bauermeister, Boris, Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Calvén, Jakob, Cardoso, J. M. R., Cervantes, M., Cichon, D., Coderre, D., Colijn, A. P., Conrad, J., Cussonneau, J. P., Decowski, M. P., de Perio, P., Di Gangi, P., Di Giovanni, A., Diglio, S., Duchovni, E., Fei, J., Ferella, Alfredo D., Fieguth, A., Franco, D., Fulgione, W., Rosso, A. Gallo, Galloway, M., Gao, F., Garbini, M., Geis, C., Goetzke, L. W., Greene, Z., Grignon, C., Hasterok, C., Hogenbirk, E., Itay, R., Kaminsky, B., Kessler, G., Kish, A., Landsman, H., Lang, R. F., Lellouch, D., Levinson, L., Le Calloch, M., Levy, C., Lin, Q., Lindemann, S., Lindner, M., Lopes, J. A. M., Manfredini, A., Undagoitia, T. Marrodan, Masbou, J., Massoli, F. V., Masson, D., Mayani, D., Meng, Y., Messina, M., Micheneau, K., Miguez, B., Molinario, A., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Orrigo, S. E. A., Pakarha, P., Pelssers, Bart, Persiani, R., Piastra, F., Pienaar, J., Piro, M. -C., Plante, G., Priel, N., Rauch, L., Reichard, S., Reuter, C., Rizzo, A., Rosendahl, S., Rupp, N., dos Santos, J. M. F., Sartorelli, G., Scheibelhut, M., Schindler, S., Schreiner, J., Schumann, M., Lavina, L. Scotto, Selvi, M., Shagin, P., Silva, M., Simgen, H., Sivers, M. v., Stein, A., Thers, D., Tiseni, A., Trinchero, G., Tunnell, C. D., Wall, R., Wang, H., Weber, M., Wei, Y., Weinheimer, C., Wulf, J., and Zhang, Y.

Abstract

We report on WIMP search results of the XENON100 experiment, combining three runs summing up to 477 live days from January 2010 to January 2014. Data from the first two runs were already published. A blind analysis was applied to the last run recorded between April 2013 and January 2014 prior to combining the results. The ultralow electromagnetic background of the experiment, similar to 5 x 10(-3) events/(keV(ee) x kg x day)) before electronic recoil rejection, together with the increased exposure of 48 kg x yr, improves the sensitivity. A profile likelihood analysis using an energy range of (6.6-43.3) keV(nr) sets a limit on the elastic, spin-independent WIMP-nucleon scattering cross section for WIMP masses above 8 GeV/c(2), with a minimum of 1.1 x 10(-45) cm(2) at 50 GeV/c(2) and 90% confidence level. We also report updated constraints on the elastic, spin-dependent WIMP-nucleon cross sections obtained with the same data. We set upper limits on the WIMP-neutron (proton) cross section with a minimum of 2.0 x 10(-40) cm(2) (52 x 10(-40) cm(2)) at a WIMP mass of 50 GeV/c(2), at 90% confidence level.

Published
2016
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12. The XENON1T Data Acquisition System

Author

E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, L. Althueser, F.D. Amaro, V.C. Antochi, F. Arneodo, D. Barge, L. Baudis, B. Bauermeister, L. Bellagamba, M.L. Benabderrahmane, T. Berger, P. A. Breur, A. Brown, E. Brown, S. Bruenner, G. Bruno, R. Budnik, L. Bütikofer, C. Capelli, J.M.R. Cardoso, D. Cichon, D. Coderre, A.P. Colijn, J. Conrad, J.P. Cussonneau, M.P. Decowski, P. de Perio, P. Di Gangi, A. Di Giovanni, S. Diglio, A. Elykov, G. Eurin, J. Fei, A.D. Ferella, A. Fieguth, W. Fulgione, P. Gaemers, A. Gallo Rosso, M. Galloway, F. Gao, M. Garbini, L. Grandi, Z. Greene, C. Hasterok, E. Hogenbirk, J. Howlett, M. Iacovacci, R. Itay, F. Joerg, S. Kazama, A. Kish, M. Kobayashi, G. Koltman, A. Kopec, H. Landsman, R.F. Lang, L. Levinson, Q. Lin, S. Lindemann, M. Lindner, F. Lombardi, J.A.M. Lopes, E. López Fune, C. Macolino, J. Mahlstedt, A. Manfredini, F. Marignetti, T. Marrodán Undagoitia, J. Masbou, D. Masson, S. Mastroianni, M. Messina, K. Micheneau, K. Miller, A. Molinario, K. Morå, Y. Mosbacher, M. Murra, J. Naganoma, K. Ni, U. Oberlack, K. Odgers, B. Pelssers, R. Peres, F. Piastra, J. Pienaar, V. Pizzella, G. Plante, R. Podviianiuk, H. Qiu, D. Ramírez García, S. Reichard, B. Riedel, A. Rocchetti, N. Rupp, J.M.F. dos Santos, G. Sartorelli, N. Šarčević, M. Scheibelhut, S. Schindler, J. Schreiner, D. Schulte, M. Schumann, L. Scotto Lavina, M. Selvi, P. Shagin, E. Shockley, M. Silva, H. Simgen, C. Therreau, D. Thers, F. Toschi, G. Trinchero, C.D. Tunnell, N. Upole, M. Vargas, G. Volta, O. Wack, H. Wang, Y. Wei, C. Weinheimer, D. Wenz, C. Wittweg, J. Wulf, J. Ye, Y. Zhang, T. Zhu, J.P. Zopounidis, for the XENON collaboration, M. Pieracci, C. Tintori, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), XENON, Aprile E., Aalbers J., Agostini F., Alfonsi M., Althueser L., Amaro F.D., Antochi V.C., Arneodo F., Barge D., Baudis L., Bauermeister B., Bellagamba L., Benabderrahmane M.L., Berger T., Breur P.A., Brown A., Brown E., Bruenner S., Bruno G., Budnik R., Butikofer L., Capelli C., Cardoso J.M.R., Cichon D., Coderre D., Colijn A.P., Conrad J., Cussonneau J.P., Decowski M.P., De Perio P., Gangi P.D., Giovanni A.D., Diglio S., Elykov A., Eurin G., Fei J., Ferella A.D., Fieguth A., Fulgione W., Gaemers P., Rosso A.G., Galloway M., Gao F., Garbini M., Grandi L., Greene Z., Hasterok C., Hogenbirk E., Howlett J., Iacovacci M., Itay R., Joerg F., Kazama S., Kish A., Kobayashi M., Koltman G., Kopec A., Landsman H., Lang R.F., Levinson L., Lin Q., Lindemann S., Lindner M., Lombardi F., Lopes J.A.M., Fune E.L., MacOlino C., Mahlstedt J., Manfredini A., Marignetti F., Undagoitia T.M., Masbou J., Masson D., Mastroianni S., Messina M., Micheneau K., Miller K., Molinario A., Mora K., Mosbacher Y., Murra M., Naganoma J., Ni K., Oberlack U., Odgers K., Pelssers B., Peres R., Piastra F., Pienaar J., Pizzella V., Plante G., Podviianiuk R., Qiu H., Garcia D.R., Reichard S., Riedel B., Rocchetti A., Rupp N., Santos J.M.F.D., Sartorelli G., Sarcevic N., Scheibelhut M., Schindler S., Schreiner J., Schulte D., Schumann M., Lavina L.S., Selvi M., Shagin P., Shockley E., Silva M., Simgen H., Therreau C., Thers D., Toschi F., Trinchero G., Tunnell C.D., Upole N., Vargas M., Volta G., Wack O., Wang H., Wei Y., Weinheimer C., Wenz D., Wittweg C., Wulf J., Ye J., Zhang Y., Zhu T., Zopounidis J.P., Collaboration F.T.X., Pieracci M., Tintori C., XENON (IHEF, IoP, FNWI), IoP (FNWI), Université de Nantes - Faculté des Sciences et des Techniques, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Aprile, E., Aalbers, J., Agostini, F., Alfonsi, M., Althueser, L., Amaro, F. D., Antochi, V. C., Arneodo, F., Barge, D., Baudis, L., Bauermeister, B., Bellagamba, L., Benabderrahmane, M. L., Berger, T., Breur, P. A., Brown, A., Brown, E., Bruenner, S., Bruno, G., Budnik, R., Butikofer, L., Capelli, C., Cardoso, J. M. R., Cichon, D., Coderre, D., Colijn, A. P., Conrad, J., Cussonneau, J. P., Decowski, M. P., De Perio, P., Gangi, P. D., Giovanni, A. D., Diglio, S., Elykov, A., Eurin, G., Fei, J., Ferella, A. D., Fieguth, A., Fulgione, W., Gaemers, P., Rosso, A. G., Galloway, M., Gao, F., Garbini, M., Grandi, L., Greene, Z., Hasterok, C., Hogenbirk, E., Howlett, J., Iacovacci, M., Itay, R., Joerg, F., Kazama, S., Kish, A., Kobayashi, M., Koltman, G., Kopec, A., Landsman, H., Lang, R. F., Levinson, L., Lin, Q., Lindemann, S., Lindner, M., Lombardi, F., Lopes, J. A. M., Fune, E. L., Macolino, C., Mahlstedt, J., Manfredini, A., Marignetti, F., Undagoitia, T. M., Masbou, J., Masson, D., Mastroianni, S., Messina, M., Micheneau, K., Miller, K., Molinario, A., Mora, K., Mosbacher, Y., Murra, M., Naganoma, J., Ni, K., Oberlack, U., Odgers, K., Pelssers, B., Peres, R., Piastra, F., Pienaar, J., Pizzella, V., Plante, G., Podviianiuk, R., Qiu, H., Garcia, D. R., Reichard, S., Riedel, B., Rocchetti, A., Rupp, N., Santos, J. M. F. D., Sartorelli, G., Sarcevic, N., Scheibelhut, M., Schindler, S., Schreiner, J., Schulte, D., Schumann, M., Lavina, L. S., Selvi, M., Shagin, P., Shockley, E., Silva, M., Simgen, H., Therreau, C., Thers, D., Toschi, F., Trinchero, G., Tunnell, C. D., Upole, N., Vargas, M., Volta, G., Wack, O., Wang, H., Wei, Y., Weinheimer, C., Wenz, D., Wittweg, C., Wulf, J., Ye, J., Zhang, Y., Zhu, T., Zopounidis, J. P., Collaboration, F. T. X., Pieracci, M., and Tintori, C.

Subjects
Physics - Instrumentation and Detectors, Computer science, FOS: Physical sciences, 01 natural sciences, Signal, Data acquisition, Software, Front-end electronics for detector readout, 0103 physical sciences, Calibration, Data acquisition concept, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Instrumentation, Mathematical Physics, Time projection chamber, 010308 nuclear & particles physics, business.industry, Control and monitor systems online, Detector, Bandwidth (signal processing), Data acquisition concepts, Instrumentation and Detectors (physics.ins-det), Trigger concepts and systems (hardware and software), business, Energy (signal processing), Computer hardware
Abstract

The XENON1T liquid xenon time projection chamber is the most sensitive detector built to date for the measurement of direct interactions of weakly interacting massive particles with normal matter. The data acquisition system (DAQ) is constructed from commercial, open source, and custom components to digitize signals from the detector and store them for later analysis. The system achieves an extremely low signal threshold below a tenth of a photoelectron using a parallelized readout with the global trigger deferred to a later, software stage. The event identification is based on MongoDB database queries and has over 97% efficiency at recognizing interactions at the analysis energy threshold. A readout bandwidth over 300 MB/s is reached in calibration modes and is further expandable via parallelization. This DAQ system was successfully used during three years of operation of XENON1T., 14 pages, 6 figures, submitted to JINST; Version 2 with minor updates to text

Published
2019
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13. Climate migrants' survival threatened by "C" shaped anthropic barriers.

Author

Butikofer L, Ji W, Sacchi R, and Mangiacotti M

Subjects
Humans, Climate Change, Human Migration, Models, Theoretical
Abstract

Despite studies on range shifts being abundant, the problem of dispersal barriers limiting climate migrants' movement is yet to be fully included into any modeling framework. For this reason, we introduce a novel concept whereby the interplay of range shifts and dispersal barriers of a particular spatial configuration can threaten the persistence of populations under a climate change scenario. We named this concept "C-trap," based on the topographic shape of such barriers. After elaborating on the theoretical features of C-traps, we provide a simple method that combines environmental data and future climate projections to locate them spatially. We use this method to determine where high C-trap densities have the potential to further threaten the conservation of endangered, endemic animals across the world's terrestrial realm, in a climate change scenario. Our methodology detected potential C-traps for the study system, with areas of high density mostly located in east Europe, south Asia and North America. However, finer-scale analyses are required to assess the magnitude of the threat locally. Dispersal barriers add an additional dimension to range shift studies and can ultimately prevent otherwise successful climate migrants from tracking their climatic niche. The methodology presented here is simple and flexible enough to be adapted to a wide range of taxa and locations as well as the fast development of range shift modeling. Therefore, we encourage researchers to include the effects of anthropogenic dispersal barriers in range shifts models and in the planning of effective conservation strategies with reference to climate change., (© 2019 International Society of Zoological Sciences, Institute of Zoology/Chinese Academy of Sciences and John Wiley & Sons Australia, Ltd.)

Published
2020
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14. A new method for modelling biological invasions from early spread data accounting for anthropogenic dispersal.

Author

Butikofer L, Jones B, Sacchi R, Mangiacotti M, and Ji W

Subjects
Biodiversity, Climate Change, Ecosystem, Humans, New Zealand, Human Activities, Introduced Species, Models, Biological, Population Dynamics
Abstract

Biological invasions are one of the major causes of biodiversity loss worldwide. In spite of human aided (anthropogenic) dispersal being the key element in the spread of invasive species, no framework published so far accounts for its peculiar characteristics, such as very rapid dispersal and independence from the existing species distribution. We present a new method for modelling biological invasions using historical spatio-temporal records. This method first discriminates between data points of anthropogenic origin and those originating from natural dispersal, then estimates the natural dispersal kernel. We use the expectation-maximisation algorithm for the first step; we then use Ripley's K-function as a spatial similarity metric to estimate the dispersal kernel. This is done accounting for habitat suitability and providing estimates of the inference precision. Tests on simulated data show good accuracy and precision for this method, even in the presence of challenging, but realistic, limitations of data in the invasion time series, such as gaps in the survey times and low number of records. We also provide a real case application of our method using the case of Litoria frogs in New Zealand. This method is widely applicable across the field of biological invasions, epidemics and climate change induced range shifts and provides a valuable contribution to the management of such issues. Functions to implement this methodology are made available as the R package Biolinv (https://cran.r-project.org/package=Biolinv)., Competing Interests: The authors have declared that no competing interests exist.

Published
2018
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