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2. Strange hadron production in Au+Au collisions at sNN=7.7 , 11.5, 19.6, 27, and 39 GeV

Author

S. Fazio, I. G. Bordyuzhin, James Brandenburg, K. N. Barish, Z. Ye, T. Tarnowsky, Maowu Nie, A. Kechechyan, Pradip Kumar Sahu, Maria Stefaniak, Lukas Holub, Subhasis Chattopadhyay, Bedangadas Mohanty, F. G. Atetalla, G. Eppley, Pavol Federic, A. A. Derevschikov, Dingwei Zhang, J. Pluta, N. Chankova-Bunzarova, Muhammad Usman Ashraf, Skipper Kagamaster, Subhash Singha, Y. K. Sun, Bernd Surrow, Paul Sorensen, Rene Bellwied, Brian Page, Yifan Hong, John Nelson, Nu Xu, Raghav Kunnawalkam Elayavalli, Xiangming Sun, Kejun Kang, L. V. Nogach, Jana Bielcikova, B. Huang, Z. Moravcova, N. K. Pruthi, O. D. Tsai, Xinyue Ju, Zhen Liu, Feng Liu, Norbert Herrmann, N. Elsey, J. Putschke, Chris Perkins, K. Gopal, Lanny Ray, A. V. Brandin, Janet Elizabeth Seger, Z. Chang, I. M. Deppner, Song Zhang, Neha Shah, Zebo Tang, A. Ogawa, Takafumi Niida, Vipul Bairathi, Lokesh Kumar, C. A. Gagliardi, Hans Georg Ritter, Jeong-Hun Lee, Peifeng Liu, F. Videbæk, Dmitri Smirnov, Hal Spinka, D. P. Kikola, H. Liu, Joseph Kwasizur, C. Zhong, E. C. Aschenauer, Wen-Qing Shen, Jaroslav Adam, Madan M. Aggarwal, David Stewart, Irakli Chakaberia, B. Stringfellow, Saskia Mioduszewski, Shusu Shi, M. Tokarev, Yang Yang, Matthew Kelsey, Yuanjing Ji, J. Engelage, Robert E. Tribble, Fuqiang Wang, D. K. Mishra, L. Didenko, Y. Fisyak, Qian Yang, Xiaolong Chen, Yaping Wang, Arabinda Behera, Richard Daniel Majka, X. Dong, B. Schmidke, Liang He, Hao-jie Xu, I. K. Yoo, Xiaoyu Liu, P. Chaloupka, Ting Lin, K. Oh, Chitrasen Jena, X. Zhu, Yifei Zhang, G. Nigmatkulov, Alexandre Alarcon Do Passo Suaide, Rongrong Ma, S. W. Wissink, Miroslav Simko, Ron Longacre, Mariusz Przybycien, F. Seck, P. Szymanski, A. I. Hamad, Sedigheh Jowzaee, Isaac Upsal, Dave Underwood, Xinjie Huang, Prithwish Tribedy, B. K. Srivastava, Juan M. Romero, Sevil Salur, M. Sergeeva, Qinghua Xu, Maksym Zyzak, J. Rusnak, Christina Markert, H. H. Wieman, O. Rusnakova, H. S. Matis, Nihar Sahoo, Cheng Li, D. Kapukchyan, Declan Keane, J. M. Landgraf, M. Lomnitz, Diana Pawlowska, L. K. Kosarzewski, E. P. Sichtermann, J. Lauret, Jing-Han Chen, Qiye Shou, Shengli Huang, M. Posik, H. W. Ke, L. Fulek, M. M. Mondal, E. G. Judd, P. Seyboth, Jan Vanek, Leszek Adamczyk, Shuai Yang, J. Schambach, D. Kalinkin, Xiaofeng Luo, Guo-Liang Ma, Chensheng Zhou, Alexander Vasiliev, Yevheniia Khyzhniak, S. Stanislaus, L. Kochenda, J. W. Harris, M. Kocan, Robert Licenik, I. G. Alekseev, Anthony Robert Timmins, Adam Ryszard Kisiel, Chong Kim, Siwei Luo, Anju Bhasin, R. Seto, Jianping Cheng, Li Yi, Z. Tu, M. A. Lisa, J. C. Mei, Tetsuro Sugiura, A. J. Bassill, J. C. Dunlop, L. Wen, L. Ruan, ShinIchi Esumi, B. K. Chan, Michal Sumbera, T. Ullrich, S. Heppelmann, C. Dilks, Roland Laszlo Pinter, Xin Li, B. J. Summa, Jaroslav Bielcik, T. G. Dedovich, Dmitry Morozov, M. Strikhanov, K. Yip, Zubayer Ahammed, Joseph Adams, Catherine Tomkiel, Hank Crawford, H. Z. Huang, Kishora Nayak, Rafal Sikora, S. Kabana, Ivan Kisel, P. Kravtsov, Fuwang Shen, J. Bryslawskyj, R. Fatemi, A. Lebedev, Manuel Calderon De La Barca Sanchez, Gang Wang, I. Bunzarov, O. Matonoha, Norbert Schmitz, Z. Y. Zhang, Yu-Gang Ma, Jiangyong Jia, Todd Kinghorn, Nalinda Kulathunga Mudiyanselage, O. V. Rogachevskiy, Vitalii Okorokov, Yi Wang, T. Nonaka, T. Todoroki, Guannan Xie, Isaac Mooney, Shenghui Zhang, Ming Shao, L. C. Bland, Arghya Chatterjee, R. Lednicky, Wei Li, Justin Ewigleben, A. Gibson, G. Odyniec, J. Sandweiss, William Jacobs, Hanna Paulina Zbroszczyk, Roli Esha, Feng-Han Chang, A. K. Bhati, T. Ljubicic, Wei Xie, M. Cherney, I. Vassiliev, Chi Yang, Rosi Reed, Daniel Nemes, S. Siejka, J. H. Thomas, Yuliang Sun, Jie Zhao, H. Caines, Yi-Fei Xu, A. Quintero, A. H. Tang, Mate Csanad, Hua Pei, Nasim, D. N. Svirida, S. K. Tripathy, R. Pak, A. Aparin, S. Ramachandran, J. L. Drachenberg, Olga Evdokimov, Yuanjing Li, Niseem Magdy Abdelwahab Abdelrahman, G. S. Averichev, Zhigang Xiao, Jagbir Singh, T. Huang, Nikolai Smirnov, O. Eyser, W. J. Llope, Joel Anthony Mazer, Z. Yang, Derek Anderson, Kun Jiang, Jay Roberts, Benjamin Schweid, T. J. Humanic, Alexander Jentsch, Zhenyu Ye, N. G. Minaev, Maria Zurek, A. Attri, K. Krueger, P. Huo, D. Arkhipkin, A. Hamed, E. Shahaliev, P. Filip, Yicheng Feng, Yang Wu, Anik Gupta, R. Witt, Lei Zhang, Xiaoping Zhang, J. M. Butterworth, Sergei A. Voloshin, Spiros Margetis, Gene Van Buren, Bill Christie, J. C. Webb, D. Tlusty, A. Lipiec, Zhongbin Xu, Lukas Kramarik, Frank Jm Geurts, T. Galatyuk, Sooraj Krishnan Radhakrishnan, E. Finch, W. Zha, Peng Liu, Wlodek Guryn, S. Vokal, Yue Liang, Y. Panebratsev, W. Solyst, Saehanseul Oh, D. Grosnick, J. Porter, R. Aoyama, Samuel Heppelmann, B. Tu, Tong Liu, S. Das, K. Meehan, G. Agakishiev, S. Horvat, Roy A. Lacey, T. Edmonds, Pengfei Wang, Gary Westfall, D. Cebra, S. Trentalange, Zhanwen Zhu, Kevin Adkins, Long Ma, Yanfang Liu, J. Fedorisin, B. Pawlik, P. V. Shanmuganathan, D. Mallick, G. Igo, K. Kauder, and A. Taranenko

Subjects
Physics, Strange quark, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Strangeness production, Strangeness, 01 natural sciences, Baryon, Nuclear physics, 0103 physical sciences, Transverse mass, High Energy Physics::Experiment, Impact parameter, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

We present STAR measurements of strange hadron (KS0, Λ, Λ¯, Ξ−, Ξ¯+, Ω−, Ω¯+, and ϕ) production at midrapidity (|y

Published
2020

3. Underlying event measurements in p+p collisions at s=200 GeV at RHIC

Author

F. G. Atetalla, X. Zhu, Xiangming Sun, A. H. Tang, Christina Markert, Lokesh Kumar, Lawrence Pinsky, Wen-Qing Shen, H. S. Matis, Z. Chang, H. Sako, P. C. Weidenkaff, Jaroslav Adam, Lukas Holub, Bedangadas Mohanty, Siwei Luo, L. K. Kosarzewski, Y. H. Leung, D. Kincses, Saskia Mioduszewski, Shusu Shi, S. Lan, Zhongbin Xu, K. Gopal, Z. Moravcova, S. Vokal, Yue Liang, F. Seck, Lanny Ray, Robert E. Tribble, Xiaolong Chen, Arabinda Behera, B. K. Chan, Michal Sumbera, M. Posik, Benjamin Schweid, T. J. Humanic, Catherine Tomkiel, Hank Crawford, D. Neff, Lukas Kramarik, Paul Sorensen, J. Lauret, N. K. Pruthi, G. Agakishiev, A. Hamed, Audrey Francisco, Sooraj Krishnan Radhakrishnan, Rongrong Ma, Xiaoyu Liu, E. G. Judd, T. G. Dedovich, Nihar Sahoo, S. Horvat, D. Cebra, J. Rusnak, E. Finch, Yevheniia Khyzhniak, S. Trentalange, Joseph Kwasizur, S. Stanislaus, L. Kochenda, H. Liu, Z. Tu, A. I. Hamad, Sedigheh Jowzaee, Dave Underwood, Yuanjing Ji, Zhanwen Zhu, M. Kocan, L. Ruan, C. J. Feng, G. Eppley, Joseph Adams, J. Engelage, G. Nigmatkulov, F. Videbæk, James Brandenburg, Robert Licenik, Anthony Robert Timmins, Adam Ryszard Kisiel, Yi Wang, T. Nonaka, Wei Li, David Stewart, Ivan Kisel, Declan Keane, Jiangyong Jia, D. P. Kikola, Long Ma, B. Stringfellow, J. C. Dunlop, L. Wen, Isaac Upsal, Roy A. Lacey, T. Edmonds, J. Pluta, K. N. Barish, Wei Xie, J. D. Nam, Pengfei Wang, Alexander Kiselev, B. Schmidke, Chris Perkins, N. Chankova-Bunzarova, Skipper Kagamaster, Subhash Singha, S. Fazio, Chitrasen Jena, Sevil Salur, Yanfang Liu, Roland Laszlo Pinter, R. Fatemi, A. Aparin, Yifan Hong, Yu Zhang, J. W. Harris, Z. Ye, M. S. Daugherity, I. G. Bordyuzhin, J. M. Landgraf, Rene Bellwied, P. V. Shanmuganathan, D. Chen, Dmitry Morozov, Yifei Zhang, Diana Pawlowska, J. Fedorisin, Zhiwan Xu, Isaac Mooney, Shenghui Zhang, Todd Kinghorn, Maowu Nie, Song Zhang, T. Tarnowsky, Ming Shao, B. Pawlik, Zebo Tang, I. G. Alekseev, William Jacobs, E. P. Sichtermann, E. Shahaliev, H. W. Ke, Zubayer Ahammed, N. S. Lukow, M. A. Lisa, Alexander Vasiliev, L. Fulek, M. Strikhanov, D. Mallick, L. C. Bland, Xiaofeng Luo, Guo-Liang Ma, A. Kechechyan, Norbert Schmitz, M. Cherney, Yaping Wang, Rosi Reed, D. Kalinkin, Y. Xu, Marton Imre Nagy, J. H. Thomas, S. Heppelmann, Xin Li, B. J. Summa, Yuliang Sun, P. Chaloupka, I. Vassiliev, Ting Lin, Nu Xu, Li Yi, Z. P. Zhang, Hua Pei, S. K. Tripathy, G. Igo, Pavol Federic, A. A. Derevschikov, Feng-Han Chang, Gary Westfall, Raghav Kunnawalkam Elayavalli, Shu He, A. Gibson, G. Odyniec, Jing-Han Chen, Kevin Adkins, Z. Y. Zhang, Qiye Shou, Kejun Kang, L. V. Nogach, Muhammad Usman Ashraf, J. Sandweiss, S. Kabana, Chi Yang, Jian-Song Wang, Mate Csanad, Nasim, P. Kravtsov, Fuwang Shen, Peng Liu, Wlodek Guryn, Y. Panebratsev, Nalinda Kulathunga Mudiyanselage, Saehanseul Oh, D. Grosnick, Alexandre Alarcon Do Passo Suaide, Qinghua Xu, Yi-Fei Xu, X. H. He, Niseem Magdy Abdelwahab Abdelrahman, Maksym Zyzak, Z. Wang, S. Ramachandran, D. N. Svirida, Janet Elizabeth Seger, Joel Anthony Mazer, Z. Yang, O. D. Tsai, Cheng Li, D. Kapukchyan, R. Pak, Chensheng Zhou, Norbert Herrmann, Spiros Margetis, O. Eyser, Xinyue Ju, Zhen Liu, K. Kauder, A. Taranenko, Sergei A. Voloshin, Feng Liu, Kishora Nayak, Maria Stefaniak, J. Putschke, Y. Fisyak, Zhigang Xiao, D. Tlusty, Jagbir Singh, T. Huang, J. M. Butterworth, D. Isenhower, Z. Chen, J. C. Webb, Yuanjing Li, G. S. Averichev, Derek Anderson, I. M. Deppner, H. Qiu, M. Tokarev, Yang Yang, Matthew Kelsey, T. Ullrich, Hans Georg Ritter, A. Ogawa, Anju Bhasin, Roli Esha, R. Seto, Samuel Heppelmann, P. Szymanski, N. G. Minaev, Daniel Nemes, Tong Liu, Chong Kim, Xinjie Huang, B. Kimelman, Peifeng Liu, Jie Zhao, H. H. Wieman, W. Solyst, Prithwish Tribedy, B. K. Srivastava, Juan M. Romero, H. Z. Huang, Dingwei Zhang, A. Pandav, M. Chevalier, Y. Hu, E. Hoffman, Rafal Sikora, Shengli Huang, P. Filip, P. Seyboth, Hal Spinka, A. Lebedev, J. L. Drachenberg, M. Sergeeva, Jana Bielcikova, Olga Evdokimov, Annika Ewigleben, Manuel Calderon De La Barca Sanchez, Gang Wang, Jan Vanek, Leszek Adamczyk, Gene Van Buren, Susumu Sato, W. Zha, Nikolai Smirnov, Xiaoping Zhang, T. Ljubicic, Kun Jiang, J. Porter, Jay Roberts, Zhenyu Ye, Hao-jie Xu, Brian Page, Maria Zurek, H. Caines, A. V. Brandin, W. He, Bill Christie, K. Krueger, Jianping Cheng, A. Quintero, Subikash Choudhury, Yicheng Feng, Takafumi Niida, Vipul Bairathi, R. Witt, Irakli Chakaberia, Neha Shah, C. Zhong, E. C. Aschenauer, Arghya Chatterjee, L. Didenko, X. Dong, Jeong-Hun Lee, Miroslav Simko, Ron Longacre, Mariusz Przybycien, Shuai Yang, Jaroslav Bielcik, O. V. Rogachevskiy, Vitalii Okorokov, Yang Wu, Yufu Lin, Frank Jm Geurts, T. Galatyuk, Guannan Xie, R. Lednicky, Hanna Paulina Zbroszczyk, Qian Yang, Richard Daniel Majka, Y. K. Sun, Bernd Surrow, K. Yip, S. W. Wissink, ShinIchi Esumi, N. Elsey, Latiful Kabir, Yu-Gang Ma, C. A. Gagliardi, W. J. Llope, Alexander Jentsch, Madan M. Aggarwal, A. Attri, Fuqiang Wang, P. Huo, and John Nelson

Subjects
Physics, Proton, Transverse momentum, Chatterjee, Underlying event, Mathematical physics
Abstract

Author(s): Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Anderson, DM; Aparin, A; Aschenauer, EC; Ashraf, MU; Atetalla, FG; Attri, A; Averichev, GS; Bairathi, V; Barish, K; Behera, A; Bellwied, R; Bhasin, A; Bielcik, J; Bielcikova, J; Bland, LC; Bordyuzhin, IG; Brandenburg, JD; Brandin, AV; Butterworth, J; Caines, H; Calderon De La Barca Sanchez, M; Cebra, D; Chakaberia, I; Chaloupka, P; Chan, BK; Chang, FH; Chang, Z; Chankova-Bunzarova, N; Chatterjee, A; Chen, D; Chen, JH; Chen, X; Chen, Z; Cheng, J; Cherney, M; Chevalier, M; Choudhury, S; Christie, W; Crawford, HJ; Csanad, M; Daugherity, M; Dedovich, TG; Deppner, IM; Derevschikov, AA; Didenko, L; Dong, X; Drachenberg, JL; Dunlop, JC; Edmonds, T; Elsey, N; Engelage, J; Eppley, G; Esha, R; Esumi, S; Evdokimov, O; Ewigleben, A; Eyser, O; Fatemi, R; Fazio, S; Federic, P; Fedorisin, J; Feng, CJ; Feng, Y; Filip, P; Finch, E; Fisyak, Y; Francisco, A; Fulek, L; Gagliardi, CA; Galatyuk, T; Geurts, F; Gibson, A; Gopal, K; Grosnick, D; Guryn, W; Hamad, AI; Hamed, A | Abstract: Particle production sensitive to nonfactorizable and nonperturbative processes that contribute to the underlying event associated with a high transverse momentum (pT) jet in proton+proton collisions at s=200 GeV is studied with the STAR detector. Each event is divided into three regions based on the azimuthal angle with respect to the highest-pT jet direction: In the leading jet direction ("Toward"), opposite to the leading jet ("Away"), and perpendicular to the leading jet ("Transverse"). In the Transverse region, the average charged particle density is found to be between 0.4 and 0.6 and the mean transverse momentum

Published
2020

4. The Cyclotron Institute at Texas A&M University

Author

Dan Melconian, Donald May, Robert E. Tribble, Grigory Rogachev, Charles M. Folden, Ralf Rapp, G. Christian, Yiu-Wing Lui, J.C. Hardy, Joseph Natowitz, and Sherry Yennello

Subjects
Nuclear and High Energy Physics, Engineering, 010308 nuclear & particles physics, business.industry, Cyclotron, Foundation (engineering), 01 natural sciences, Atomic energy commission, law.invention, Nuclear physics, law, 0103 physical sciences, 010306 general physics, business
Abstract

Since the first cyclotron beam fifty years ago, the Texas A&M Cyclotron Institute has functioned as a university-based laboratory. Over the past two decades it has been funded by the U.S. Department of Energy, the State of Texas, the Welch Foundation, and commercial sale of beam-time. The first accelerator is a conventional isochronous cyclotron modeled after the 88″ cyclotron at the Lawrence Berkeley Laboratory. It arose from a proposal funded by the U.S. Atomic Energy Commission, the R. A. Welch Foundation (a private foundation headquartered in Houston), and the State of Texas and continued to operate from 1967 to 1987. After recommissioning in 2007 as a higher-field K150 machine, it is still in operation. The K500 cyclotron, funded in 1980 by the Welch Foundation and Texas A&M University and modeled after the Michigan State NSCL K500 cyclotron, is a superconducting isochronous cyclotron whose first beam was extracted in 1988.

Published
2017

5. Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510 GeV

Author

Y. K. Sun, Bernd Surrow, I. G. Alekseev, M. A. Lisa, J. C. Mei, N. Elsey, G. Eppley, Long Ma, Peifeng Liu, J. Pluta, C. A. Gagliardi, Guannan Xie, Yanfang Liu, R. Lednicky, J. Bryslawskyj, N. Chankova-Bunzarova, Skipper Kagamaster, Subhash Singha, Justin Ewigleben, J. Fedorisin, T. Nonaka, Christina Markert, A. Gibson, G. Odyniec, Mate Csanad, Anju Bhasin, O. Rusnakova, Nasim, L. C. Bland, T. Ljubicic, H. S. Matis, Hanna Paulina Zbroszczyk, B. Pawlik, L. K. Kosarzewski, Chris Perkins, Joel Anthony Mazer, Rene Bellwied, A. J. Bassill, Liang He, Alexandre Alarcon Do Passo Suaide, Lukas Holub, Bedangadas Mohanty, Isaac Upsal, J. Lauret, H. Caines, A. Quintero, A. Aparin, Jaroslav Bielcik, J. Rusnak, Z. Chang, J. M. Butterworth, S. Stanislaus, L. Kochenda, Yaping Wang, J. C. Webb, Spiros Margetis, T. Niida, A. F. Kraishan, M. Kocan, Jie Zhang, Saskia Mioduszewski, Shusu Shi, Xiaofeng Luo, F. Seck, Guo-Liang Ma, E. Shahaliev, Dingwei Zhang, A. Lebedev, W. Solyst, John Nelson, O. V. Rogachevskiy, Vitalii Okorokov, A. H. Tang, Feng-Han Chang, Muhammad Usman Ashraf, Neha Shah, L. Ruan, Pavol Federic, Alexander Vasiliev, Li Yi, M. Posik, Tetsuro Sugiura, J. L. Drachenberg, Olga Evdokimov, M. Tokarev, Yang Yang, Matthew Kelsey, Gary Westfall, Arghya Chatterjee, Xiangming Sun, Kevin Adkins, B. Huang, C. Zhong, E. C. Aschenauer, Norbert Herrmann, Chi Yang, P. Kravtsov, G. Agakishiev, D. S. Gunarathne, Kun Jiang, J. Putschke, C. Dilks, S. W. Wissink, Wen-Qing Shen, Jaroslav Adam, Kejun Kang, S. Das, S. Horvat, Jana Bielcikova, Madan M. Aggarwal, Fuqiang Wang, S. Kabana, Z. Moravcova, Jeong-Hun Lee, O. D. Tsai, A. Ogawa, D. Cebra, Nalinda Kulathunga Mudiyanselage, Xinyue Ju, S. Trentalange, Zhen Liu, L. V. Nogach, T. Todoroki, Jay Roberts, Zhenyu Ye, D. K. Mishra, X. Dong, Maria Zurek, ShinIchi Esumi, Benjamin Schweid, Manuel Calderon De La Barca Sanchez, P. Szymanski, Zhanwen Zhu, Gang Wang, Robert E. Tribble, J. H. Thomas, Yuliang Sun, T. J. Humanic, Jiangyong Jia, D. Arkhipkin, A. Hamed, N. K. Pruthi, D. N. Svirida, S. Fazio, K. Krueger, I. G. Bordyuzhin, Joseph Kwasizur, J. Engelage, D. L. Olvitt, Miroslav Simko, Ron Longacre, Mariusz Przybycien, Paul Sorensen, G. Nigmatkulov, Cheng Li, D. Kapukchyan, I. K. Yoo, Subhasis Chattopadhyay, Yicheng Feng, A. Vossen, H. H. Wieman, Xiaolong Chen, Arabinda Behera, Xiaoyu Liu, J. W. Harris, R. Witt, Yu-Gang Ma, Roli Esha, E. P. Sichtermann, W. J. Llope, G. S. Averichev, Shuai Yang, J. M. Landgraf, I. Vassiliev, J. C. Dunlop, L. Wen, Daniel Nemes, Jie Zhao, Zhongbin Xu, Jing-Han Chen, Qiye Shou, Dmitry Morozov, J. Schambach, Alexander Jentsch, Ivan Kisel, Zubayer Ahammed, M. Strikhanov, Norbert Schmitz, F. Videbæk, M. M. Mondal, C. E. Flores, E. G. Judd, D. P. Kikola, A. Attri, Wei Li, Z. Ye, Yuanjing Li, Dmitri Smirnov, B. Stringfellow, Chensheng Zhou, A. Lipiec, Lukas Kramarik, Maowu Nie, L. Zhang, P. Huo, Sooraj Krishnan Radhakrishnan, E. Finch, Chong Kim, Niseem Magdy Abdelwahab Abdelrahman, M. Sergeeva, Kishora Nayak, W. Zha, Zhigang Xiao, Jagbir Singh, T. Huang, J. Porter, Nu Xu, Raghav Kunnawalkam Elayavalli, J. Sandweiss, A. Kechechyan, Pradip Kumar Sahu, B. K. Chan, Michal Sumbera, Yifei Zhang, P. Chaloupka, Yi-Fei Xu, Derek Anderson, Janet Elizabeth Seger, Ting Lin, I. Bunzarov, O. Matonoha, M. Lomnitz, I. M. Deppner, N. G. Minaev, Catherine Tomkiel, Hank Crawford, T. Ullrich, H. Z. Huang, Yi Wang, R. Pak, Siwei Luo, Feng Liu, A. I. Hamad, Sedigheh Jowzaee, P. Filip, Dave Underwood, Rafal Sikora, Gene Van Buren, Bill Christie, Hans Georg Ritter, Declan Keane, Xinjie Huang, Joseph Adams, Prithwish Tribedy, B. K. Srivastava, Juan M. Romero, Shengli Huang, T. G. Dedovich, Isaac Mooney, Shenghui Zhang, William Jacobs, B. Schmidke, Alena Harlenderova, H. W. Ke, L. Fulek, Yang Wu, Anik Gupta, Frank Jm Geurts, T. Galatyuk, K. Meehan, Jindrich Lidrych, Yifan Hong, Song Zhang, Zebo Tang, K. Yip, Giacomo Contin, Rongrong Ma, Nihar Sahoo, Robert Licenik, Anthony Robert Timmins, Adam Ryszard Kisiel, Roland Laszlo Pinter, R. Fatemi, Todd Kinghorn, Brian Page, Ming Shao, M. Cherney, Rosi Reed, Lokesh Kumar, A. V. Brandin, Hua Pei, S. K. Tripathy, Vipul Bairathi, Irakli Chakaberia, Y. Fisyak, K. Oh, Qian Yang, Richard Daniel Majka, D. Kalinkin, S. Heppelmann, Xin Li, B. J. Summa, S. Siejka, Z. Y. Zhang, P. Seyboth, Jan Vanek, Leszek Adamczyk, S. Ramachandran, O. Eyser, Jianping Cheng, Sergei A. Voloshin, S. Vokal, Yue Liang, Wei Xie, Hal Spinka, Hao-jie Xu, Roy A. Lacey, T. Edmonds, Pengfei Wang, P. V. Shanmuganathan, D. Mallick, G. Igo, K. Kauder, A. Taranenko, F. G. Atetalla, Alexander Schmah, Lanny Ray, H. Liu, David Stewart, Jakub Kvapil, Sevil Salur, A. K. Bhati, Nikolai Smirnov, Xiaoping Zhang, L. G. Efimov, L. Didenko, Peng Liu, Wlodek Guryn, Y. Panebratsev, Saehanseul Oh, D. Grosnick, R. Aoyama, Samuel Heppelmann, B. Tu, Qinghua Xu, Maksym Zyzak, D. D. Brown, R. Seto, James Brandenburg, K. N. Barish, T. Tarnowsky, Xianglei Zhu, and A. A. Derevschikov

Subjects
Physics, Quark, Particle physics, Proton, 010308 nuclear & particles physics, Drell–Yan process, 01 natural sciences, Helicity, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Spin-½, Boson
Abstract

We report new STAR measurements of the single-spin asymmetries $A_L$ for $W^+$ and $W^-$ bosons produced in polarized proton--proton collisions at $\sqrt{s}$ = 510 GeV as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to an integrated luminosity of 250 pb$^{-1}$. The results are combined with previous results obtained with 86 pb$^{-1}$. A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton--proton data suggests a difference between the $\bar{u}$ and $\bar{d}$ quark helicity distributions for $0.05 < x < 0.25$. In addition, we report new results for the double-spin asymmetries $A_{LL}$ for $W^\pm$, as well as $A_L$ for $Z/\gamma^*$ production and subsequent decay into electron--positron pairs.

Published
2019

6. Beam energy dependence of (anti-)deuteron production in Au + Au collisions at the BNL Relativistic Heavy Ion Collider

Author

Yang Wu, Anik Gupta, Frank Jm Geurts, T. Galatyuk, B. K. Chan, Michal Sumbera, Catherine Tomkiel, Hank Crawford, D. Mallick, Paul Sorensen, K. Meehan, D. Kalinkin, P. Chaloupka, Ting Lin, G. Igo, S. Heppelmann, Xin Li, B. J. Summa, Gary Westfall, Peng Liu, Wlodek Guryn, Z. Y. Zhang, Y. Panebratsev, Saehanseul Oh, D. Grosnick, K. Kauder, A. Taranenko, K. Yip, Siwei Luo, Zhongbin Xu, H. W. Ke, L. Fulek, D. P. Kikola, R. Aoyama, Mariusz Przybycien, Lukas Kramarik, Xiaofeng Luo, S. Ramachandran, O. Eyser, B. Stringfellow, Sooraj Krishnan Radhakrishnan, R. Fatemi, Todd Kinghorn, Long Ma, Joseph Adams, Jiangyong Jia, T. G. Dedovich, A. H. Tang, Sergei A. Voloshin, E. Finch, Maria Stefaniak, Guo-Liang Ma, Li Yi, Samuel Heppelmann, B. Tu, Ming Shao, Feng Liu, Yifan Hong, Song Zhang, Zebo Tang, Isaac Upsal, Xiangming Sun, Yanfang Liu, J. Fedorisin, Isaac Mooney, Shenghui Zhang, Benjamin Schweid, T. J. Humanic, D. Arkhipkin, W. J. Llope, I. G. Bordyuzhin, S. Vokal, Yue Liang, J. Bryslawskyj, Yi Wang, T. Nonaka, Wei Li, M. Cherney, Rosi Reed, Lokesh Kumar, Hal Spinka, Hans Georg Ritter, A. I. Hamad, William Jacobs, Sedigheh Jowzaee, Alexander Jentsch, Dave Underwood, Chris Perkins, Wei Xie, A. K. Bhati, Z. Moravcova, Robert E. Tribble, Nikolai Smirnov, Xiaoping Zhang, A. Attri, Alexander Vasiliev, Tetsuro Sugiura, Muhammad Usman Ashraf, T. Ljubicic, P. Huo, Qinghua Xu, Kejun Kang, L. V. Nogach, Hua Pei, S. K. Tripathy, N. K. Pruthi, O. D. Tsai, Xinyue Ju, Zhen Liu, S. W. Wissink, S. Kabana, E. Shahaliev, F. G. Atetalla, Prithwish Tribedy, B. K. Srivastava, Juan M. Romero, X. Zhu, Maksym Zyzak, Z. Ye, Mate Csanad, Lanny Ray, Nu Xu, Raghav Kunnawalkam Elayavalli, Nasim, Maowu Nie, P. Kravtsov, Shengli Huang, Declan Keane, A. Kechechyan, H. Liu, Hao-jie Xu, David Stewart, ShinIchi Esumi, J. C. Dunlop, L. Wen, Janet Elizabeth Seger, Roy A. Lacey, T. Edmonds, Pengfei Wang, Sevil Salur, I. M. Deppner, G. Eppley, R. Seto, E. P. Sichtermann, Rongrong Ma, I. K. Yoo, Xiaoyu Liu, M. Sergeeva, Roli Esha, Daniel Nemes, Jie Zhao, Peifeng Liu, Nalinda Kulathunga Mudiyanselage, Joel Anthony Mazer, Brian Page, Lei Zhang, Spiros Margetis, Zubayer Ahammed, Cheng Li, D. Kapukchyan, Nihar Sahoo, A. V. Brandin, Norbert Schmitz, J. Pluta, N. Chankova-Bunzarova, V. A. Okorokov, Skipper Kagamaster, Subhash Singha, Chong Kim, Yu-Gang Ma, Anju Bhasin, H. Z. Huang, Manuel Calderon De La Barca Sanchez, Gang Wang, James Brandenburg, K. N. Barish, Christina Markert, Rafal Sikora, Guannan Xie, Chensheng Zhou, R. Bellwied, E. G. Judd, Takafumi Niida, Vipul Bairathi, Liang He, Robert Licenik, Anthony Robert Timmins, Adam Ryszard Kisiel, R. Lednicky, L. C. Bland, A. Lipiec, Yi-Fei Xu, M. Tokarev, Yang Yang, Matthew Kelsey, Feng-Han Chang, Qian Yang, Roland Laszlo Pinter, Hanna Paulina Zbroszczyk, H. S. Matis, D. Tlusty, A. Lebedev, R. Pak, T. Tarnowsky, T. Ullrich, Richard Daniel Majka, D. N. Svirida, J. L. Drachenberg, Olga Evdokimov, A. Hamed, Kun Jiang, A. A. Derevschikov, Jay Roberts, J. Porter, P. Szymanski, Maria Zurek, Dingwei Zhang, L. K. Kosarzewski, Lukas Holub, Bedangadas Mohanty, F. Videbæk, Tong Liu, H. H. Wieman, Arghya Chatterjee, K. Krueger, Yicheng Feng, R. Witt, Joseph Kwasizur, J. Lauret, Neha Shah, Jaroslav Adam, Jeong-Hun Lee, L. Didenko, I. Chakaberia, Yaping Wang, C. Zhong, Yevheniia Khyzhniak, S. Stanislaus, L. Kochenda, Xiaolong Chen, Miroslav Simko, Ron Longacre, Yuanjing Ji, J. Engelage, Alexandre Alarcon Do Passo Suaide, Arabinda Behera, X. Dong, Jing-Han Chen, Qiye Shou, J. W. Harris, Yifei Zhang, Shuai Yang, J. M. Landgraf, J. Schambach, Dmitry Morozov, Diana Pawlowska, Norbert Herrmann, J. Putschke, M. Strikhanov, H. Caines, A. Ogawa, J. Sandweiss, Kishora Nayak, J. Rusnak, Subhasis Chattopadhyay, M. Kocan, L. Ruan, I. Bunzarov, O. Matonoha, Jana Bielcikova, P. Filip, Gene Van Buren, Bill Christie, I. Vassiliev, Niseem Magdy Abdelwahab Abdelrahman, Zhigang Xiao, Jagbir Singh, T. Huang, Derek Anderson, N. G. Minaev, I. G. Alekseev, M. A. Lisa, G. Agakishiev, S. Horvat, D. Cebra, S. Trentalange, Zhanwen Zhu, Justin Ewigleben, G. Odyniec, J. C. Webb, W. Solyst, Madan M. Aggarwal, Fuqiang Wang, D. K. Mishra, Ivan Kisel, Y. K. Sun, Bernd Surrow, N. Elsey, J. H. Thomas, Yuliang Sun, C. A. Gagliardi, Jaroslav Bielcik, Yuanjing Li, G. S. Averichev, O. V. Rogachevskiy, Saskia Mioduszewski, Shusu Shi, F. Seck, M. Posik, S. Siejka, P. Seyboth, Jan Vanek, P. Federic, Jianping Cheng, Y. Fisyak, and K. Oh

Subjects
Physics, 010308 nuclear & particles physics, Equation of state (cosmology), 01 natural sciences, REAÇÕES NUCLEARES, Nuclear physics, Baryon, Deuterium, 0103 physical sciences, Transverse momentum, Quark–gluon plasma, Production (computer science), 010306 general physics, Relativistic Heavy Ion Collider, Beam energy
Abstract

Author(s): Adam, J; Adamczyk, L; Adams, JR; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Anderson, DM; Aoyama, R; Aparin, A; Arkhipkin, D; Aschenauer, EC; Ashraf, MU; Atetalla, F; Attri, A; Averichev, GS; Bairathi, V; Barish, K; Bassill, AJ; Behera, A; Bellwied, R; Bhasin, A; Bhati, AK; Bielcik, J; Bielcikova, J; Bland, LC; Bordyuzhin, IG; Brandenburg, JD; Brandin, AV; Bryslawskyj, J; Bunzarov, I; Butterworth, J; Caines, H; Calderon De La Barca Sanchez, M; Cebra, D; Chakaberia, I; Chaloupka, P; Chan, BK; Chang, FH; Chang, Z; Chankova-Bunzarova, N; Chatterjee, A; Chattopadhyay, S; Chen, JH; Chen, X; Cheng, J; Cherney, M; Christie, W; Crawford, HJ; Csanad, M; Das, S; Dedovich, TG; Deppner, IM; Derevschikov, AA; Didenko, L; Dilks, C; Dong, X; Drachenberg, JL; Dunlop, JC; Edmonds, T; Elsey, N; Engelage, J; Eppley, G; Esha, R; Esumi, S; Evdokimov, O; Ewigleben, J; Eyser, O; Fatemi, R; Fazio, S; Federic, P; Fedorisin, J; Feng, Y; Filip, P; Finch, E; Fisyak, Y; Fulek, L; Gagliardi, CA; Galatyuk, T; Geurts, F; Gibson, A; Grosnick, D; Gupta, A; Guryn, W | Abstract: We report the energy dependence of mid-rapidity (anti-)deuteron production in Au+Au collisions at sNN=7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV, measured by the STAR experiment at the BNL Relativistic Heavy Ion Collider. The yield of deuterons is found to be well described by the thermal model. The collision energy, centrality, and transverse momentum dependence of the coalescence parameter B2 are discussed. We find that the values of B2 for antideuterons are systematically lower than those for deuterons, indicating that the correlation volume of antibaryons is larger than that of baryons at sNN from 19.6 to 39 GeV. In addition, values of B2 are found to vary with collision energy and show a broad minimum around sNN=20-40 GeV, which might imply a change of the equation of state of the medium in these collisions.

Published
2019

7. Azimuthal anisotropy in Cu+Au collisions at sNN=200 GeV

Author

D. L. Olvitt, Isaac Upsal, James Brandenburg, J. Bryslawskyj, T. Nonaka, K. N. Barish, Subhasis Chattopadhyay, Joseph Kwasizur, T. Tarnowsky, Giacomo Contin, A. Aparin, Xianglei Zhu, Rongrong Ma, Alexander Vasiliev, Lanny Ray, Tetsuro Sugiura, P. V. Shanmuganathan, A. A. Derevschikov, Nihar Sahoo, C. Dilks, D. Mallick, Y. Pandit, Zillay Khan, X. C. Chen, Feng Liu, G. Igo, H. Liu, S. Kabana, F. Videbæk, E. Shahaliev, I. G. Bordyuzhin, Yuanjing Li, L. Krauth, M. Tokarev, Yang Yang, David Stewart, Jana Bielcikova, J. Engelage, Anthony Robert Timmins, Adam Ryszard Kisiel, Qinghua Xu, Maksym Zyzak, R. Seto, L. Zhang, Keith Landry, Hans Georg Ritter, P. Seyboth, Sevil Salur, G. Nigmatkulov, K. Kauder, A. Taranenko, L. Didenko, I. Chakaberia, Bedangadas Mohanty, Yang Wu, Anik Gupta, A. I. Hamad, A. Harlenderova, Jiro Fujita, Sedigheh Jowzaee, R. Fatemi, Xinjie Huang, Paul Sorensen, Gerrit Jan van Nieuwenhuizen, Yifei Zhang, Zachariah Miller, Abdel Nasser Tawfik, Chris Perkins, J. M. Landgraf, Ming Shao, Frank Jm Geurts, Prithwish Tribedy, B. K. Srivastava, Dmitry Morozov, Dave Underwood, Long Ma, Zhongbin Xu, J. L. Romero, M. Lomnitz, M. Strikhanov, Nu Xu, Jing-Han Chen, H. H. Wieman, Christina Markert, O. Rusnakova, Janet Elizabeth Seger, Declan Keane, Wei Li, Niseem Magdy Abdelwahab Abdelrahman, I. M. Deppner, M. Cherney, Rosi Reed, Lokesh Kumar, J. L. Drachenberg, Michal Sumbera, H. S. Matis, D. P. Kikola, B. Stringfellow, J. Sandweiss, P. Federic, Olga Evdokimov, Barbara Antonina Trzeciak, L. K. Kosarzewski, Kun Jiang, S. K. Tripathy, Jay Roberts, Yanfang Liu, Hank Crawford, Prabhat Bhattarai, J. Fedorisin, B. Pawlik, Jianping Cheng, E. Finch, Anju Bhasin, Daniel Brown, A. K. Bhati, Nasim, Xiaofeng Luo, Guo-Liang Ma, K. Meehan, Jindrich Lidrych, Zhenyu Ye, T. Niida, Nikolai Smirnov, Xiaoping Zhang, A. Lebedev, L. Adamczyk, Zhigang Xiao, T. Huang, Derek Anderson, K. Krueger, Hal Spinka, Grant Webb, Xu Sun, Alexandre Alarcon Do Passo Suaide, J. Lauret, Spiros Margetis, Martin Kocmanek, S. Stanislaus, L. Kochenda, D. Tlusty, Zhaozhong Shi, J. W. Harris, Gary Westfall, Li Yi, A. S. Hirsch, P. Kravtsov, L. G. Efimov, A. M. Schmah, Arghya Chatterjee, N. G. Minaev, R. Witt, Yi Guo, Manuel Calderon De La Barca Sanchez, Gang Wang, J. C. Dunlop, L. Wen, Kevin Adkins, John Campbell, Song Zhang, Zebo Tang, T. K. Nayak, S. B. Nurushev, S. Fazio, P. Federicova, Zubayer Ahammed, Norbert Schmitz, Jeong-Hun Lee, Robert E. Tribble, Zhao Feng, N. Kulathunga, S. Das, P. Filip, Norbert Herrmann, Wlodek Guryn, Y. Panebratsev, D. Grosnick, I. K. Yoo, Miroslav Simko, Ron Longacre, I. Bunzarov, Mariusz Przybycien, Cheng Li, D. Kapukchyan, J. Putschke, Roli Esha, R. Aoyama, Daniel Nemes, Jie Zhao, Z. Ye, A. Ogawa, Shuai Yang, Gene Van Buren, Y. Fisyak, Samuel Heppelmann, B. Tu, Q. Y. Shou, Yi-Fei Xu, Maowu Nie, M. M. Mondal, K. Oh, C. E. Flores, E. G. Judd, J. Schambach, Bill Christie, A. Kechechyan, W. Zha, Xiaozhi Bai, J. Porter, Pradip Kumar Sahu, Wen-Qing Shen, R. Pak, Jiangyong Jia, Xiaolong Chen, Arabinda Behera, J. Rusnak, A. F. Kraishan, L. Ruan, T. Todoroki, Long Zhou, Chong Kim, H. Z. Huang, Rafal Sikora, Jonathan Bouchet, Martin Girard, Jochen Mathias Thaeder, Mustafa M. Mustafa, B. Schmidke, H. W. Ke, L. Fulek, L. C. Bland, Katarzyna Poniatowska, Chi Yang, D. N. Svirida, T. G. Dedovich, H. Pei, N. Yu, E. P. Sichtermann, Kejun Kang, L. V. Nogach, Chensheng Zhou, Peifeng Liu, T. Ullrich, Yi Wang, Liang He, Neha Shah, C. Zhong, E. C. Aschenauer, X. Dong, T. Ljubicic, H. Caines, A. Quintero, Nuggehalli Ajitanand, Dmitri Smirnov, P. Chaloupka, Ting Lin, Muhammad Usman Ashraf, A. Gibson, O. D. Tsai, V. A. Okorokov, A. H. Tang, Benjamin Schweid, T. J. Humanic, D. Arkhipkin, A. Hamed, M. Sergeeva, Siwei Luo, Joseph Adams, Shenghui Zhang, William Jacobs, Jian Deng, G. Eppley, G. Agakishiev, D. S. Gunarathne, S. Horvat, J. Pluta, D. Cebra, S. Trentalange, Brian Page, Zhanwen Zhu, N. Chankova-Bunzarova, A. V. Brandin, Subhash Singha, Vipul Bairathi, Justin Ewigleben, G. Odyniec, Rene Bellwied, Qian Yang, Richard Daniel Majka, K. Yip, John Nelson, Xiangming Sun, B. Huang, J. M. Butterworth, J. H. Thomas, Arthur M. Poskanzer, Miroslav Saur, J. C. Webb, Jaroslav Bielcik, Jordan Roth, N. K. Pruthi, Jie Zhang, J. Kvapil, O. V. Rogachevskiy, W. Solyst, Sanshiro Mizuno, Y. K. Sun, Bernd Surrow, N. Elsey, D. Mayes, I. G. Alekseev, C. A. Gagliardi, M. A. Lisa, J. C. Mei, G. S. Averichev, Madan M. Aggarwal, Fuqiang Wang, D. K. Mishra, A. Vossen, Ivan Kisel, Thorsten Sven Kollegger, D. Kalinkin, Z. Chang, Yaping Wang, Saskia Mioduszewski, Shusu Shi, S. Heppelmann, Xin Li, B. J. Summa, M. Posik, Z. Y. Zhang, Michael Skoby, J. E. Draper, S. Ramachandran, O. Eyser, Sergei A. Voloshin, S. Vokal, Wei Xie, Matthew Rehbein, Roy A. Lacey, W. J. Llope, Alexander Jentsch, A. Attri, P. Huo, Guannan Xie, R. Lednicky, Hanna Paulina Zbroszczyk, Ji Xu, Jingbo Zhang, S. W. Wissink, ShinIchi Esumi, and Yu-Gang Ma

Subjects
Physics, Range (particle radiation), 010308 nuclear & particles physics, media_common.quotation_subject, 01 natural sciences, Asymmetry, Charged particle, Pseudorapidity, Electric field, 0103 physical sciences, Rapidity, Center of mass, Atomic physics, Nuclear Experiment, 010306 general physics, Anisotropy, media_common
Abstract

The azimuthal anisotropic flow of identified and unidentified charged particles has been systematically studied in Cu+Au collisions at sNN=200 GeV for harmonics n=1–4 in the pseudorapidity range |η

Published
2018

8. Global polarization of Λ hyperons in Au + Au collisions at sNN=200 GeV

Author

Chensheng Zhou, T. Ullrich, Yi Wang, T. Ljubicic, H. Caines, Neha Shah, C. Zhong, X. Dong, Jeong-Hun Lee, Miroslav Simko, Ron Longacre, A. Harlenderova, Long Ma, Justin Ewigleben, G. Odyniec, Shuai Yang, Chris Perkins, Yanfang Liu, J. Schambach, J. Fedorisin, Anju Bhasin, A. J. Bassill, Xiaofeng Luo, Guo-Liang Ma, J. C. Webb, Roli Esha, Jaroslav Bielcik, Li Yi, T. Niida, W. Solyst, Daniel Nemes, Jie Zhao, H. W. Ke, L. Fulek, Jie Zhang, A. S. Hirsch, A. Lebedev, L. C. Bland, Alexandre Alarcon Do Passo Suaide, P. Kravtsov, A. M. Schmah, A. Lipiec, O. V. Rogachevskiy, I. G. Alekseev, M. A. Lisa, J. C. Mei, J. Porter, Arghya Chatterjee, Feng-Han Chang, D. N. Svirida, Ivan Kisel, D. L. Olvitt, Gary Westfall, J. Kvapil, G. Agakishiev, D. S. Gunarathne, Long Zhou, Subhasis Chattopadhyay, S. Horvat, D. Cebra, S. Trentalange, Zhanwen Zhu, Chong Kim, Y. K. Sun, Bernd Surrow, Brian Page, S. Siejka, Nu Xu, H. Z. Huang, A. V. Brandin, N. Elsey, D. Mayes, Janet Elizabeth Seger, Daniel Brown, Hal Spinka, I. M. Deppner, F. Videbæk, Norbert Herrmann, Rafal Sikora, Yuanjing Li, J. Rusnak, Zhongbin Xu, A. F. Kraishan, Vipul Bairathi, L. Zhang, L. Ruan, J. L. Romero, C. A. Gagliardi, J. Putschke, Yifei Zhang, Qian Yang, Richard Daniel Majka, Lukas Kramarik, T. Todoroki, Jana Bielcikova, Madan M. Aggarwal, Sooraj Krishnan Radhakrishnan, Fuqiang Wang, E. Finch, P. Federicova, J. H. Thomas, A. Ogawa, M. Tokarev, Yang Yang, K. Yip, D. K. Mishra, N. Kulathunga, J. L. Drachenberg, Yang Wu, Anik Gupta, P. Szymanski, P. Filip, H. H. Wieman, I. G. Bordyuzhin, Y. Fisyak, Olga Evdokimov, K. Oh, Muhammad Usman Ashraf, Xiangming Sun, D. Mallick, Frank Jm Geurts, B. Huang, A. Vossen, D. Kalinkin, T. Galatyuk, Gene Van Buren, O. D. Tsai, Z. Ye, Manuel Calderon De La Barca Sanchez, L. Didenko, I. Chakaberia, Cheng Li, D. Kapukchyan, G. Igo, Maowu Nie, L. Krauth, S. Heppelmann, A. Kechechyan, James Brandenburg, K. N. Barish, Xin Li, B. J. Summa, Fuwang Shen, Gang Wang, G. S. Averichev, Christina Markert, Bill Christie, K. Kauder, A. Taranenko, O. Rusnakova, P. Seyboth, Xiaozhi Bai, Jaroslav Adam, K. Meehan, S. B. Nurushev, J. Bryslawskyj, Z. Y. Zhang, T. Tarnowsky, H. S. Matis, T. Nonaka, Jindrich Lidrych, Jiangyong Jia, L. K. Kosarzewski, Xiaolong Chen, J. Lauret, Xianglei Zhu, Arabinda Behera, Kun Jiang, Jay Roberts, Song Zhang, Yaping Wang, A. A. Derevschikov, A. I. Hamad, Saskia Mioduszewski, Shusu Shi, Zebo Tang, Sedigheh Jowzaee, S. Stanislaus, L. Kochenda, Jan Vanek, Joseph Kwasizur, Dave Underwood, N. K. Pruthi, Qinghua Xu, F. Seck, Maksym Zyzak, E. Shahaliev, Declan Keane, K. Krueger, P. Federic, M. Sergeeva, I. Vassiliev, M. Posik, Jianping Cheng, G. Eppley, O. Eyser, Sergei A. Voloshin, J. W. Harris, R. Seto, Siwei Luo, J. Pluta, W. J. Llope, Wei Li, R. Witt, N. Chankova-Bunzarova, I. Bunzarov, O. Matonoha, Subhash Singha, Joseph Adams, Alexander Jentsch, Niseem Magdy Abdelwahab Abdelrahman, Zhigang Xiao, T. Huang, J. C. Dunlop, L. Wen, Rene Bellwied, S. Vokal, Yue Liang, Wei Xie, A. Attri, Wlodek Guryn, Y. Panebratsev, Isaac Mooney, Shenghui Zhang, Zubayer Ahammed, Norbert Schmitz, Derek Anderson, P. Huo, Saehanseul Oh, D. Grosnick, William Jacobs, N. G. Minaev, John Campbell, S. W. Wissink, Q. Y. Shou, Yi-Fei Xu, Sumit Kumar, R. Pak, Feng Liu, Roy A. Lacey, Hans Georg Ritter, R. Aoyama, Mariusz Przybycien, ShinIchi Esumi, Prithwish Tribedy, B. K. Srivastava, Shengli Huang, Samuel Heppelmann, Peifeng Liu, B. Tu, Yu-Gang Ma, Guannan Xie, R. Lednicky, Hanna Paulina Zbroszczyk, A. K. Bhati, Nikolai Smirnov, Xiaoping Zhang, Xu Sun, L. G. Efimov, Liang He, Ji Xu, F. G. Atetalla, Lanny Ray, H. Liu, David Stewart, Sevil Salur, T. G. Dedovich, H. Pei, N. Yu, Kejun Kang, L. V. Nogach, Isaac Upsal, Alexander Vasiliev, Tetsuro Sugiura, S. Kabana, Paul Sorensen, D. P. Kikola, B. Stringfellow, R. Fatemi, Todd Kinghorn, Ming Shao, M. Cherney, Rosi Reed, Lokesh Kumar, S. K. Tripathy, Rongrong Ma, Nihar Sahoo, X. C. Chen, Anthony Robert Timmins, Adam Ryszard Kisiel, J. Engelage, J. M. Landgraf, Dmitry Morozov, M. Strikhanov, J. Sandweiss, Nasim, Joel Anthony Mazer, Spiros Margetis, D. Tlusty, S. Das, Jing-Han Chen, Michal Sumbera, Catherine Tomkiel, Hank Crawford, P. Chaloupka, Ting Lin, A. H. Tang, Benjamin Schweid, T. J. Humanic, D. Arkhipkin, A. Hamed, Jesus Negrete, V. A. Okorokov, Lukas Holub, Bedangadas Mohanty, Robert E. Tribble, I. K. Yoo, M. M. Mondal, E. G. Judd, and E. P. Sichtermann

Subjects
Physics, 010308 nuclear & particles physics, media_common.quotation_subject, Hyperon, Vorticity, Polarization (waves), Lambda, 01 natural sciences, Asymmetry, Magnetic field, Nuclear physics, Pseudorapidity, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, media_common
Abstract

Global polarization of $\Lambda$ hyperons has been measured to be of the order of a few tenths of a percent in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV, with no significant difference between $\Lambda$ and $\bar{\Lambda}$. These new results reveal the collision energy dependence of the global polarization together with the results previously observed at $\sqrt{s_{_{NN}}}$ = 7.7 -- 62.4 GeV and indicate noticeable vorticity of the medium created in non-central heavy-ion collisions at the highest RHIC collision energy. The signal is in rough quantitative agreement with the theoretical predictions from a hydrodynamic model and from the AMPT (A Multi-Phase Transport) model. The polarization is larger in more peripheral collisions, and depends weakly on the hyperon's transverse momentum and pseudorapidity $\eta^H$ within $|\eta^H

Published
2018

9. Trojan Horse Method experiments with radioactive ion beams

Author

Livius Trache, I. Indelicato, S. Hayakawa, R. G. Pizzone, Brian Roeder, A. Coc, Livio Lamia, H. Yamaguchi, Dam Nguyen Binh, Takashi Teranishi, Claudio Spitaleri, Robert E. Tribble, Roberta Spartà, G. G. Rapisarda, Silvio Cherubini, Yasuo Wakabayashi, Tetsuro Komatsubara, Shigeru Kubono, Nicolas de Séréville, Gabor Kiss, Marco La Cognata, Naohito Iwasa, Fairouz Hammache, Seigo Kato, M. Gulino, Shawn Bishop, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Institut de Physique Nucléaire d'Orsay (IPNO), and 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)

Subjects
Physics, Radioactive ion beams, 010308 nuclear & particles physics, QC1-999, Coulomb barrier, Trojan horse, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computational physics, Physics and Astronomy (all), Low energy, 0103 physical sciences, Divergence (statistics), 010303 astronomy & astrophysics, Intensity (heat transfer), Beam (structure)
Abstract

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.

Published
2017

10. Preliminary Production of 211At at the Texas A&M University Cyclotron Institute

Author

Gamal Akabani, Sriram Shankar, Thomas Michael Martin, Vihar Bhakta, Michael Hackemack, G. Tabacaru, Robert E. Tribble, and A. A. Alharbi

Subjects
Neutrons, Neutron dose, Radionuclide, Universities, Epidemiology, Health, Toxicology and Mutagenesis, Nuclear engineering, Cyclotron, Cyclotrons, Production efficiency, Engineering physics, law.invention, Radiation Protection, Gamma dose, law, Electromagnetic shielding, Environmental science, Radiology, Nuclear Medicine and imaging, Neutron, Astatine, Beam (structure)
Abstract

A feasibility study for the production of the alpha particle-emitting radionuclide At was performed at the Texas A&M University Cyclotron Institute as part of the Interdisciplinary Radioisotope Production and Radiochemistry Program. The mission of this program centers upon the production of radionuclides for use in diagnostic and therapeutic nuclear medicine with the primary focus on development of novel therapeutic strategies. As a first step in establishing this program, two goals were outlined: (i) verify production of At and compare results to published data, and (ii) evaluate shielding and radiological safety issues for large-scale implementation using an external target. The radionuclide At was produced via the Bi (α, 2n) At reaction using the K500 cyclotron. Two experiments were conducted, using beam energies of 27.8 MeV and 25.3 MeV, respectively. The resulting yields for At were found to be 36.0 MBq μA h and 12.4 MBq μA h, respectively, which fall within the range of published yield data. Strategies for increasing absolute yield and production efficiency were also evaluated, which focused chiefly on using a new target designed for use with the K150 cyclotron, which will enable the use of a higher beam current. Finally, neutron and gamma dose rates during production were evaluated by using the Monte Carlo code MCNPX. It was determined that a simple structure consisting of 4-in thick borated polyethylene will reduce the neutron dose rate within the cyclotron production vault by approximately a factor of 2, thereby decreasing activation of equipment.

Published
2014

11. Overview of the KoRIA Facility for Rare Isotope Beams

Author

Seonho Choi, Kwang Souk Sim, Joon Kon Kim, Kyong Sei Lee, Byoung Jin Suh, Young Kwan Kwon, Sunghyun Kim, Won Namkung, In Sik Hahn, W. Kim, Byung Yoon Park, Claudio Tenreiro, Chang Ill Choi, Eunah Joo, Y. Blumenfeld, Jerry Nolen, Young Ku Yang, Do Yoon Kim, Kang Seog Lee, Yongseok Oh, Kie Hyung Chung, Dong Uk Kim, Jong Won Kim, Myung-Ki Cheoun, Eunjoo Kim, Jaeho Jang, Tae Sun Park, Yeon Suk Choi, Byung-Sik Hong, Sang Hoon Hwang, Doh Yun Jang, Hee Jeong Seo, Woon Young So, Byung Gu Cheon, Byung Geel Yu, Hyo Jung Choi, Sun Chan Jeong, Woo-Yoon Park, Zhou Tong, Chun Sik Lee, Gi Dong Kim, Aram Kim, Hae Ryong Yang, Yeong Heum Yeon, Yong Sub Cho, Jong Tae Kim, Seung il Nam, V. K. Manchanda, Jin Ah Park, Jae Min Han, EunMi Choi, Seung Kook Ko, Hyung Ju Woo, Myeun Kwon, Chong Cheoul Yun, Jong Seo Chai, Yong Yung Lee, H. S. Lee, Jang Min Han, Ho Seung Song, Seung-wook Shin, Hee Jung Lee, Yacine Kadi, Sun Young Ryu, Won Ju Yi, Seung-Woo Hong, Chang Ho Hyun, Ju Hahn Lee, Sang-Hoon Kim, Chang-Hwan Lee, Ki Hyeon Park, P. Sigg, Chung Yeol Ryu, Jung Keun Ahn, Byoung Hwi Kang, Se Hwan Park, Su Houng Lee, Hee Seock Lee, Jang Ho Ha, Yasushige Yano, Donghyun Cho, Kang Ok Lee, Dai Hyuk Yu, Byoung Noh Lee, Bo Young Lee, Young Sung Lee, Min Sik Choi, Tae Keun Choi, Seon Young Yu, Wan Hong, Sang Duk Lee, Hideyuki Sakai, Seok Kwan Lee, Sang-Ho Kim, Bong Hyuk Choi, Chang Bum Moon, G. Jhang, Min Sang Ryu, Dong-O Jeon, Jae Won Shin, Yong Kyun Kim, Robert E. Tribble, In Kwon Yoo, Hyun-Chul Kim, Hoon Su Kang, Doo Jeong, Byung Hoon Oh, Jin Yong Park, Sang In Bak, Cheol Woo Lee, Jin Hwan Oh, Tae Yung Song, Dong Lak Kim, In Gyu Kim, Eun Ja Ha, Young Ouk Lee, Institut de Physique Nucléaire d'Orsay (IPNO), and 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)

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Cyclotron, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Uranium, 7. Clean energy, 01 natural sciences, Atomic and Molecular Physics, and Optics, Linear particle accelerator, law.invention, Nuclear physics, chemistry, law, 0103 physical sciences, 010306 general physics
Abstract

See paper for full list of authors; The Korea Rare Isotope Accelerator, currently referred to as KoRIA, is briefly presented. The KoRIA facility is aimed to enable cutting-edge sciences in a wide range of fields. It consists of a 70 kW isotope separator on-line (ISOL) facility driven by a 70 MeV, 1 mA proton cyclotron and a 400 kW in-flight fragmentation (IFF) facility. The ISOL facility uses a superconducting (SC) linac for post-acceleration of rare isotopes up to about 18 MeV/u, while the SC linac of IFF facility is capable of accelerating uranium beams up to 200 MeV/u, 8 pμA and proton beams up to 600 MeV, 660 μA. Overall features of the KoRIA facility are presented with a focus on the accelerator design.

Published
2012

12. Structure of Nuclei Far From Stability

Author

Robert E. Tribble, Jeffery C. Blackmon, L. G. Sobotka, and Carlos A. Bertulani

Subjects
Engineering, business.industry, Nuclear engineering, Cyclotron, law.invention, Nuclear physics, Proton (rocket family), Neutron capture, Data acquisition, Work (electrical), Nucleosynthesis, law, Vacuum chamber, Electric power, business
Abstract

The work performed under this grant has led to the development of a detection system that will be used to measure reaction rates for proton or neutron capture reactions at stellar energies on radioactive ions far from stability. The reaction rates are needed to better understand the physics of nucleosynthesis in explosive stellar processes such as supernovae and X-ray burst explosions. The radioactive ions will be produced at the Radioactive Ion Beam Facility (RIBF) at RIKEN near Tokyo, Japan. During the course of this work, the group involved in this project has expanded by several institutions in Europe and Japan and now involves collaborators from the U.S., Japan, Hungary, Romania, Germany, Spain, Italy, China, and South Korea. As part of the project, a novel design based on large-area silicon detectors has been built and tested and the performance characterized in a series of tests using particle beams with a variety of atomic numbers at the Cyclotron Institute of Texas A&M University and the Heavy Ion Medical Accelerator in Chiba facility (HIMAC) in Chiba, Japan. The work has involved mechanical construction of a special purpose vacuum chamber, with a precision mounting system for the silicon detectors, development of a new ASICsmore » readout system that has applications with a wide variety of silicon detector systems, and the development of a data acquisition system that is integrated into the computer system being used at RIBF. The parts noted above that are needed to carry out the research program are completed and ready for installation. Several approved experiments that will use this system will be carried out in the near future. The experimental work has been delayed due to a large increase in the cost and availability of electrical power for RIBF that occurred following the massive earthquake and tsunami that hit Japan in the spring of 2011. Another component of the research carried out with this grant involved developing the theoretical tools that are required to extract the information from the experiments that is needed to determine the stellar reaction rates. The tools developed through this part of the work will be made freely available for general use.« less

Published
2015

13. Breakup of loosely bound nuclei at intermediate energies for nuclear astrophysics and the development of a position sensitive microstrip detector system and its readout electronics using ASICs technologies

Author

Robert E. Tribble, L. G. Sobotka, Jeff C. Blackmon, and Carlos A. Bertulani

Subjects
Nuclear physics, Proton (rocket family), Physics, Neutron capture, Data acquisition, Nucleosynthesis, Nuclear engineering, Detector, Nuclear astrophysics, Vacuum chamber, Electric power
Abstract

The work performed under this grant has led to the development of a detection system that will be used to measure reaction rates for proton or neutron capture reactions at stellar energies on radioactive ions far from stability. The reaction rates are needed to better understand the physics of nucleosynthesis in explosive stellar processes such as supernovae and x-ray burst events. The radioactive ions will be produced at the Radioactive Ion Beam Facility (RIBF) at RIKEN near Tokyo, Japan. During the course of this work, the group involved in this project has expanded by several institutions in Europe and Japan and now involves collaborators from the U.S., Japan, Hungary, Romania, Germany, Spain, Italy, China, and South Korea. As part of the project, a novel design based on large-area silicon detectors has been built and tested. The work has involved mechanical construction of a special purpose vacuum chamber, with a precision mounting system for the silicon detectors, development of a new ASICs readout system that has applications with a wide variety of silicon detector systems, and the development of a data acquisition system that is integrated into the computer system being used at RIBF. The parts noted above that are neededmore » to carry out the research program are completed and ready for installation. Several approved experiments that will use this system will be carried out in the near future. The experimental work has been delayed due to a large increase in the cost and availability of electrical power for RIBF that occurred following the massive earthquake and tsunami that hit Japan in the spring of 2011. Another component of the research carried out with this grant involved developing the theoretical tools that are required to extract the information from the experiments that is needed to determine the stellar reaction rates. The tools developed through this part of the work will be made freely available for general use.« less

Published
2015

14. A facility upgrade at Texas A&M University for accelerated radioactive beams

Author

G. J. Kim, G. A. Souliotis, G. G. Chubarian, F. Abegglen, G. Tabacaru, D. P. May, Robert E. Tribble, G. Derrig, and H. L. Clark

Subjects
Physics, Radioactive ion beams, Cyclotron, General Physics and Astronomy, Electron cyclotron resonance, Ion source, Ion, law.invention, Nuclear physics, Upgrade, Physics::Plasma Physics, law, Physics::Accelerator Physics, General Materials Science, Physical and Theoretical Chemistry
Abstract

The Cyclotron Institute at Texas A&M University is carrying out an upgrade project which will lead to accelerated radioactive ion beams at intermediate energies. The project involves recommissioning a K150 cyclotron for acceleration of stable beams which will be used to produce radioactive ions. Both light-ion and heavy-ion guides will be used to stop and transport the radioactive ions to a charge breeding electron cyclotron resonance ion source. Following charge breeding, highly-charged ions will be injected into the K500 cyclotron, accelerated and then transported to existing equipment to carry out experiments.

Published
2007

16. Cyclotron Institute Upgrade Project

Author

Sherry Yennello, Henry Clark, and Robert E. Tribble

Subjects
Physics, Nuclear physics, Range (particle radiation), Upgrade, law, Cyclotron, Particle accelerator, Heavy ion, Ion source, law.invention, Ion
Abstract

The Cyclotron Institute at Texas AM (2) develop light ion and heavy ion guides for stopping radioactive ions created with the K-150 beams; and (3) transport 1+ ions from the ion guides into a charge-breeding electron-cyclotron-resonance ion source (CB-ECR) to produce highly-charged radioactive ions for acceleration in the K-500 cyclotron. When completed, the upgraded facility will provide high-quality re-accelerated secondary beams in a unique energy range in the world.

Published
2014

17. Connection between asymptotic normalization coefficients, subthreshold bound states, and resonances

Author

Robert E. Tribble and A. M. Mukhamedzhanov

Subjects
Physics, Normalization (statistics), Nuclear reaction, Nuclear and High Energy Physics, Subthreshold conduction, Nucleosynthesis, Quantum mechanics, Bound state, Nuclear astrophysics, Resonance, Nuclear Experiment, R-matrix
Abstract

We present here useful relations showing the connection between the asymptotic normalization coefficient (ANC) and the fitting parameters in K- and R-matrix theory methods which are often used when analyzing low energy experimental data. It is shown that the ANC of a subthreshold bound state defines the normalization of both direct radiative capture leading to this state and resonance capture in which the state behaves like a subthreshold resonance. A determination of the appropriate ANC(s) thus offers an alternative method for finding the strength of these types of capture reactions, both of which are important in nuclear astrophysics.

Published
1999

18. Asymptotic normalization coefficients for13C+p14N

Author

Y.-W. Lui, H. L. Clark, A. Azhari, L. Trache, Florin Carstoiu, C. A. Gagliardi, A. M. Mukhamedzhanov, and Robert E. Tribble

Subjects
Physics, Nuclear reaction, Elastic scattering, Normalization (statistics), Nuclear and High Energy Physics, Proton, Scattering, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Excited state, Order (ring theory), Atomic physics, Ground state
Abstract

The {sup 13}C({sup 14}N,{sup 13}C){sup 14}N proton exchange reaction has been measured at an incident energy of 162 MeV. Angular distributions were obtained for proton transfer to the ground and low-lying excited states in {sup 14}N. Elastic scattering of {sup 14}N on {sup 13}C also was measured out to the rainbow angle region in order to find reliable optical model potentials. Asymptotic normalization coefficients for the system {sup 13}C+p{r_arrow}thinsp{sup 14}N have been found for the ground state and the excited states at 2.313, 3.948, 5.106, and 5.834 MeV in {sup 14}N. These asymptotic normalization coefficients will be used in a determination of the {ital S} factor for {sup 7}Be(p,{gamma}){sup 8}B at solar energies from a measurement of the proton transfer reaction {sup 14}N({sup 7}Be,{sup 8}B){sup 13}C. {copyright} {ital 1998} {ital The American Physical Society}

Published
1998

19. Asymptotic normalization coefficients for10B→9Be+p

Author

H. M. Xu, J. Cejpek, A. M. Mukhamedzhanov, V. Kroha, Robert E. Tribble, C. A. Gagliardi, V. Burjan, X. G. Zhou, Florin Carstoiu, Livius Trache, Y.-W. Lui, and H. L. Clark

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Light nucleus, Radiative capture, Bound state, Incident energy, Model parameters, Born approximation, Atomic physics, Nuclear Experiment, Wave function
Abstract

The differential cross sections for the reactions ${}^{9}\mathrm{Be}{(}^{10}\mathrm{B}{,}^{10}\mathrm{B}{)}^{9}\mathrm{Be}$ and ${}^{9}\mathrm{Be}{(}^{10}\mathrm{B}{,}^{9}\mathrm{Be}{)}^{10}\mathrm{B}$ have been measured at an incident energy of 100 MeV. The elastic scattering data have been used to determine the optical model parameters for the ${}^{9}\mathrm{Be}{+}^{10}\mathrm{B}$ system at this energy. These parameters are then used in distorted-wave Born approximation (DWBA) calculations to predict the cross sections of the ${}^{9}\mathrm{Be}{(}^{10}\mathrm{B}{,}^{9}\mathrm{Be}{)}^{10}\mathrm{B}$ proton exchange reaction, populating the ground and low-lying states in ${}^{10}\mathrm{B}$. By normalizing the theoretical DWBA proton exchange cross sections to the experimental ones, the asymptotic normalization coefficients (ANC's), defining the normalization of the tail of the ${}^{10}\mathrm{B}$ bound state wave functions in the two-particle channel ${}^{9}\mathrm{Be}+p$, have been found. The ANC for the virtual decay ${}^{10}\mathrm{B}(\mathrm{g}.\mathrm{s}.){\ensuremath{\rightarrow}}^{9}\mathrm{Be}+p$ will be used in an analysis of the ${}^{10}\mathrm{B}{(}^{7}\mathrm{Be}{,}^{8}\mathrm{B}{)}^{9}\mathrm{Be}$ reaction to extract the ANC's for ${}^{8}\mathrm{B}{\ensuremath{\rightarrow}}^{7}\mathrm{Be}+p$. These ANC's determine the normalization of the ${}^{7}\mathrm{Be}(p,\ensuremath{\gamma}{)}^{8}\mathrm{B}$ radiative capture cross section at very low energies, which is crucially important for nuclear astrophysics.

Published
1997

20. ‘‘Bare’’ single-particle energies inNi56

Author

L. Trache, Kristiaan Heyde, H. Dejbakhsh, C. A. Gagliardi, V. E. Iacob, A. M. Oros, Robert E. Tribble, X. G. Zhou, Shalom Shlomo, and A. Kolomiets

Subjects
Physics, Nuclear and High Energy Physics, Atomic orbital, Hartree–Fock method, Woods–Saxon potential, Neutron, Charge (physics), Mirror nuclei, Atomic physics, Coupling (probability), Energy (signal processing)
Abstract

The structure of the low-lying levels in the mirror nuclei {sup 57}Ni and {sup 57}Cu is described within the extended unified model. The problem of single-particle energies in {sup 56}Ni is treated in detail. {open_quote}{open_quote}Bare{close_quote}{close_quote} single-particle energies are extracted from existing experimental data for the energy levels in {sup 57}Ni and {sup 57}Cu by carefully considering the influence of the coupling to excitations of the core. Important contributions arise, influencing especially the results on the spin-orbit splitting. The differences between the Coulomb energy shifts of various orbitals in {sup 56}Ni are discussed and compared with those resulting from Hartree-Fock calculations carried out using a broad range of Skyrme interactions. The parameters of the Woods-Saxon potential reproducing these neutron {open_quote}{open_quote}bare{close_quote}{close_quote} single-particle energies and the charge root-mean-square radius of {sup 56}Ni are extracted. It is demonstrated that the contributions associated with the Thomas-Ehrman effect and the electromagnetic spin-orbit interaction are important and large enough to account for the differences between the Coulomb energy shifts of the single-particle levels in {sup 56}Ni. {copyright} {ital 1996 The American Physical Society.}

Published
1996

21. Low-lying levels inCu57and therpprocess

Author

C. A. Gagliardi, L. Trache, H. Dejbakhsh, J. Jiang, Robert E. Tribble, and X. G. Zhou

Subjects
Reaction rate, Physics, Nuclear and High Energy Physics, Recoil, Proton, Excited state, Analytical chemistry, rp-process, Atomic physics
Abstract

The level scheme of {sup 57}Cu is investigated via the {sup 1}H({sup 58}Ni,{sup 57}Cu-{gamma})2{ital n} reaction by using the recoil mass spectrometer MARS at the Texas A&M Cyclotron Institute. Three low-lying excited states are observed in {sup 57}Cu at 1028 {plus_minus} 4, 1106 {plus_minus} 4, and 2398 {plus_minus} 10 keV. The results are compared with well known excited states of the mirror nucleus {sup 57}Ni. The measured excited states of {sup 57}Cu allow recalculation of the astrophysical reaction rate for the stellar radiative proton capture reaction {sup 56}Ni({ital p},{gamma}){sup 57}Cu. {copyright} {ital 1996 The American Physical Society.}

Published
1996

22. l-forbidden Gamow-Teller β decay ofCu57

Author

L. Trache, B. A. Brown, D. R. Semon, Haiying Xu, SE Hale, Sherry Yennello, Robert E. Tribble, X. G. Zhou, J. Jiang, MC Allen, H. Dejbakhsh, and C. A. Gagliardi

Subjects
Physics, Nuclear and High Energy Physics, Internal conversion, Decay scheme, Branching fraction, Double beta decay, Excited state, Half-life, Atomic physics, Ground state, Beta decay
Abstract

Absolute branching ratios for the {beta} decay of {sup 57}Cu to excited states up to 3.3 MeV in {sup 57}Ni have been determined, including the l-forbidden Gamow-Teller transition to the first excited state in {sup 57}Ni. Four transitions to excited states at 0.768, 1.113, 2.443, and 3.007 MeV are observed in addition to the superallowed decay to the ground state of {sup 57}Ni. The measured branching ratio to the ground state is 89.9 {plus_minus} 0.8{percent} and the branching ratios to the four excited states are 0.94 {plus_minus} 0.09{percent}, 8.6 {plus_minus} 0.6{percent}, 0.17 {plus_minus} 0.03{percent}, and 0.35 {plus_minus} 0.04{percent}, respectively. In addition we have measured the {sup 57}Cu half-life and find it to be 196.3 {plus_minus} 0.7 ms, which is in good agreement with the most recent measurement. {ital B}(GT) values have been extracted from the new results and are compared to shell model calculations. {copyright} {ital 1996 The American Physical Society.}

Published
1996

23. Astrophysical factor for the radiative capture reaction α+d→6Li+γ

Author

Robert E. Tribble, A. M. Mukhamedzhanov, R.P. Schmitt, and A. Sattarov

Subjects
Physics, Nuclear and High Energy Physics, Light nucleus, Astrophysical Processes, Statistics::Applications, Effective energy, Radiative capture, Atomic physics, Energy (signal processing)
Abstract

We consider the radiative capture process \ensuremath{\alpha}+d${\ensuremath{\rightarrow}}^{6}$Li+\ensuremath{\gamma} at energies, ${\mathit{E}}_{\mathrm{c}.\mathrm{m}.}$\ensuremath{\le}300 keV, that are relevant for astrophysical processes. Due to the peripheral character of the reaction, the overall normalization of the astrophysical factor ${\mathit{S}}_{24}$ is entirely governed by one quantity, the asymptotic normalization coefficient ${\mathit{C}}_{01}$ for $^{6}\mathrm{\ensuremath{\alpha}}$+d. Using the recently well established value for this constant ${\mathit{C}}_{01}$=2.3\ifmmode\pm\else\textpm\fi{}0.12 ${\mathrm{fm}}^{\mathrm{\ensuremath{-}}1/2}$, we calculated ${\mathit{S}}_{24}$ taking into account both E1 and E2 contributions. Our recommended value for ${\mathit{S}}_{24}$ is 2.57 MeV nb at the most effective energy for the capture reaction in astrophysical processes, ${\mathit{E}}_{\mathrm{c}.\mathrm{m}.}$=70 keV, which gives a reaction rate 0.036 ${\mathrm{cm}}^{3}$ ${\mathrm{mole}}^{\mathrm{\ensuremath{-}}1}$ ${\mathrm{s}}^{\mathrm{\ensuremath{-}}1}$ at the temperature 0.8\ifmmode\times\else\texttimes\fi{}${10}^{9}$ K. We found a significant energy dependence of ${\mathit{S}}_{24}$ at astrophysical energies. At energies of less than 110 keV, the E1 component dominates over the E2 component. At ${\mathit{E}}_{\mathrm{c}.\mathrm{m}.}$=70 keV, the E1 contribution to the total transition is about 58%.

Published
1995

24. Potential energy effects in light emission and electron emission from a NaCl target bombarded by Ar ions

Author

Robert E. Tribble and Chahriar Assad

Subjects
Nuclear and High Energy Physics, Ion beam, Auger effect, Chemistry, Astrophysics::High Energy Astrophysical Phenomena, Electron multiplier, Electron, Potential energy, Secondary electrons, Ion, symbols.namesake, symbols, Astrophysics::Solar and Stellar Astrophysics, Light emission, Atomic physics, Instrumentation
Abstract

Light emitted by Na atoms following the bombardment of a NaCl target with 48 keV Ar ions has been studied. Results for light yields which have been obtained as a function of incident Ar ion beam charge state are reported that include contributions from both displaced surface and sputtered atoms. Secondary electron yields from a NaCl target have also been obtained as a function of Ar ion charge state. The electron spectra show clear evidence for the emission of Cl Auger electrons, independent of the Ar ion charge state. The overall yield of electrons is found to change substantially with charge state. Correlations between the light emission and electron emission are considered.

Published
1995

25. Light emission from a NaCl target bombarded by Ar ions and the mechanism for the beam energy dependence of the light yield from Ag and Na atoms

Author

Chahriar Assad and Robert E. Tribble

Subjects
Nuclear and High Energy Physics, Ion beam deposition, Ion beam, Chemistry, Sputtering, Yield (chemistry), Light emission, Atomic physics, Kinetic energy, Instrumentation, Beam energy, Ion
Abstract

Light emitted by Na atoms following the bombardment of a NaCl target with Ar ions has been studied. Light yields that include contributions from both displaced surface and sputtered atoms have been obtained as a function of incident ion beam kinetic energy and with different Ar ion charge states. At a bombarding kinetic energy of 48 keV, we find that the light yield increases as the incident ion charge state increases. The light yield was found to increase and then slowly decrease as the ion beam kinetic energy changed from 8 to 99 keV. Sputtering calculations have been carried out for both NaCl and Ag targets to investigate possible mechanisms for explaining the observed light yield in these two system s as a function of the incident beam kinetic energy.

Published
1994

26. Fragmentation barriers of toroidal and bubble nuclei

Author

H. M. Xu, Robert E. Tribble, Cheuk-Yin Wong, and C. A. Gagliardi

Subjects
Physics, Nuclear reaction, Many-body problem, Nuclear and High Energy Physics, Toroid, Fragmentation (mass spectrometry), Bubble, Many-body theory, Atomic physics, Nuclear Experiment, Nuclear matter, Amplitude compression
Abstract

With an improved Boltzmann-Uehling-Uhlenbeck model, the deformation energy surfaces in reactions leading to the formation of toroidal and bubble nuclei are examined for central [sup 92][ital Mo]+[sup 92][ital Mo] collisions. We found that the potential maximum, or the fragmentation barrier, occurs at times close to the times when these exotic shapes are formed. However, due to the dynamics of large amplitude compression and expansion, the fragmentation barriers are significantly higher than those estimated from the liquid-drop models.

Published
1994

27. Experimental study ofβ-delayed proton decay ofAl23for nucleosynthesis in novae

Author

G. Tabacaru, M. A. Bentley, Robert E. Tribble, Thomas Davinson, P. J. Woods, A. Banu, Antti Saastamoinen, John C. Hardy, Brian Roeder, M. McCleskey, L. Trache, Juha Äystö, V. E. Iacob, and E. Simmons

Subjects
Nuclear physics, Physics, Nuclear reaction, Nuclear and High Energy Physics, Proton, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Double beta decay, Hadron, Atomic physics, Nucleon, Ground state, Radioactive decay
Abstract

The $\ensuremath{\beta}$-delayed $\ensuremath{\gamma}$ and proton decay of $^{23}\mathrm{Al}$ has been studied with an alternative detector setup at the focal plane of the momentum achromat recoil separator MARS at Texas A University. We could detect protons down to an energy of 200 keV and determine the corresponding branching ratios. Contrary to results of previous $\ensuremath{\beta}$-decay studies, no strong proton intensity from the decay of the isobaric analog state (IAS) of the $^{23}\mathrm{Al}$ ground state at ${E}_{x}=7803$ keV in $^{23}\mathrm{Mg}$ was observed. Instead we assign the observed low-energy group ${E}_{p,\mathrm{c}.\mathrm{m}.}=206$ keV to the decay from a state that is 16 keV below the IAS. We measured both proton and gamma branches from the decay of this state at ${E}_{x}=7787$ keV in $^{23}\mathrm{Mg}$, which is a very rare case in the literature. Combining our data with its measured lifetime, we determine its resonance strength to be $\ensuremath{\omega}\ensuremath{\gamma}={1.4}_{\ensuremath{-}0.4}^{+0.5}$ meV. The value is in agreement with older direct measurements, but disagrees with a recent direct measurement. This state is the most important resonance for the radiative proton capture $^{22}\mathrm{Na}$($p,\ensuremath{\gamma}$)$^{23}\mathrm{Mg}$ in some astrophysical environments, such as novae.

Published
2011

28. Deuteron elastic scattering at 110 and 120 MeV

Author

H. M. Xu, Robert E. Tribble, A. F. Zaruba, A. C. Betker, C. A. Gagliardi, and D. R. Semon

Subjects
Nuclear reaction, Physics, Nuclear physics, Elastic scattering, Nuclear and High Energy Physics, Deuterium, Scattering, Nuclear Theory, Atomic physics, Nuclear Experiment
Abstract

Deuteron elastic scattering cross sections ahve been measured at 110 and 120 MeV on C, $^{58}\mathrm{Ni}$, and $^{208}\mathrm{Pb}$. Optical model potentials have been extracted and compared to deuteron global optical model potentials.

Published
1993

29. Formation and decay of toroidal and bubble nuclei and the nuclear equation of state

Author

W. G. Lynch, H. M. Xu, Joseph Natowitz, C. A. Gagliardi, Robert E. Tribble, and Cheuk-Yin Wong

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Equation of state, Bubble, Nuclear Theory, Many-body theory, Breakup, Nuclear matter, Nuclear physics, Many-body problem, Atomic physics, Nuclear Experiment, Radioactive decay
Abstract

Multifragmentation, following the formation of toroidal and bubble nuclei, is observed with an improved Boltzmann-Uehling-Uhlenbeck (BUU) model for central {sup 92}Mo {plus} {sup 92}Mo collisions. Guided by our BUU model, we propose two signatures: (1) because of the geometries of bubbles and toroids and because of the cold breakup at low temperatures, we predict enhanced cross sections for fragments with nearly-equal masses at small center-of-mass energies. (2) the coplanarity of these nearly-equal fragments could carry important information concerning the geometry of the sources. This in turn, could provide information about the stiffness of the equation of state.

Published
1993

30. Indirect techniques in nuclear astrophysics - ANCs and THM

Author

X. Tang, Eva Simeckova, Marco La Cognata, Florin Carstoiu, A. M. Mukhamedzhanov, G. Tabacaru, S. Spitaleri, Pavel Bem, S. Romano, J. Vincour, V. Crucillà, S. Cherubini, A. Tumino, Robert E. Tribble, T. Abdullah, C. A. Gagliardi, R. G. Pizzone, Changbo Fu, V. Burjan, J. Piskor, L. Trache, Livio Lamia, and V. Kroha

Subjects
Nuclear physics, Physics, Astrophysics and Astronomy, Nuclear astrophysics
Published
2010

31. Precise half-life measurement of the superallowedβ+emitterSi26

Author

A. Banu, Robert E. Tribble, V. Horvat, John C. Hardy, N. Nica, V. E. Iacob, V. V. Golovko, L. Trache, Lie-Wen Chen, J. Goodwin, and H. I. Park

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Unitarity, Branching fraction, Double beta decay, Antimatter, Isotopes of silicon, Radioactive decay, Dimensionless quantity
Abstract

We measured the half-life of the superallowed ${0}^{+}\ensuremath{\rightarrow}{0}^{+}$ ${\ensuremath{\beta}}^{+}$ emitter $^{26}\mathrm{Si}$ to be $2245.3(7)$ ms. We used pure sources of $^{26}\mathrm{Si}$ and employed a high-efficiency gas counter, which was sensitive to positrons from both this nuclide and its daughter $^{26}\mathrm{Al}$${}^{m}$. The data were analyzed as a linked parent-daughter decay. To contribute meaningfully to any test of the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the $\mathit{ft}$ value of a superallowed transition must be determined to a precision of $0.1%$ or better. With a precision of $0.03%$, the present result is more than sufficient to be compatible with that requirement. Only the branching ratio now remains to be measured precisely before a $\ifmmode\pm\else\textpm\fi{}0.1%$ $\mathit{ft}$ value can be obtained for the superallowed transition from $^{26}\mathrm{Si}$.

Published
2010

32. Stellar reaction rate forMg22+p→Al23from the asymptotic normalization coefficient in the mirror nuclear systemNe22+n→Ne23

Author

H. L. Clark, Y.-W. Lui, Changbo Fu, Tariq Al-Abdullah, C. A. Gagliardi, Florin Carstoiu, A. M. Mukhamedzhanov, L. Trache, G. Tabacaru, Robert E. Tribble, Y. Tokimoto, and Xinfeng Chen

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotopes of neon, Carbon-12, Mirror nuclei, Atomic physics, Born approximation, Isotopes of sodium, Ground state, Isotopes of magnesium
Abstract

The production of $^{22}\mathrm{Na}$ in ONe novae can be influenced by the $^{22}\mathrm{Mg}$$(p,\ensuremath{\gamma})$$^{23}\mathrm{Al}$ reaction. To investigate this reaction rate at stellar energies, we have determined the asymptotic normalization coefficient (ANC) for $^{22}\mathrm{Mg}$$+p\ensuremath{\rightarrow}$$^{23}\mathrm{Al}$ through measurements of the ANCs in the mirror nuclear system $^{22}\mathrm{Ne}$$+n\ensuremath{\rightarrow}$$^{23}\mathrm{Ne}$. The peripheral neutron-transfer reactions $^{13}\mathrm{C}$($^{12}\mathrm{C}$,$^{13}\mathrm{C}$)$^{12}\mathrm{C}$ and $^{13}\mathrm{C}$($^{22}\mathrm{Ne}$,$^{23}\mathrm{Ne}$)$^{12}\mathrm{C}$ were studied. The identical entrance and exit channels of the first reaction make it possible to extract independently the ground-state ANC in $^{13}\mathrm{C}$. Our experiment gives ${C}_{{p}_{1/2}}^{2}$($^{13}\mathrm{C}$)$=2.24\ifmmode\pm\else\textpm\fi{}0.11$ fm${}^{\ensuremath{-}1}$, which agrees with the value obtained from several previous measurements. The weighted average for all the obtained ${C}_{{p}_{1/2}}^{2}$ is $2.31\ifmmode\pm\else\textpm\fi{}0.08$ fm${}^{\ensuremath{-}1}$. This value is adopted to be used in obtaining the ANCs in $^{23}\mathrm{Ne}$. The differential cross sections for the reaction $^{13}\mathrm{C}$($^{22}\mathrm{Ne}$,$^{23}\mathrm{Ne}$)$^{12}\mathrm{C}$ leading to the ${J}^{\ensuremath{\pi}}=5/{2}^{+}$ and $1/{2}^{+}$ states in $^{23}\mathrm{Ne}$ have been measured at 12 MeV/u. Optical model parameters for use in the DWBA calculations were obtained from measurements of the elastic scatterings $^{22}\mathrm{Ne}+^{13}\mathrm{C}$ and $^{22}\mathrm{Ne}+^{12}\mathrm{C}$. The extracted ANC for the ground state in $^{23}\mathrm{Ne}$, ${C}_{{d}_{5/2}}^{2}=0.86\ifmmode\pm\else\textpm\fi{}0.08\ifmmode\pm\else\textpm\fi{}0.12$ fm${}^{\ensuremath{-}1}$, is converted to its corresponding value in $^{23}\mathrm{Al}$ using mirror symmetry to give ${C}_{{d}_{5/2}}^{2}$($^{23}\mathrm{Al}$)$=(4.63\ifmmode\pm\else\textpm\fi{}0.77)\ifmmode\times\else\texttimes\fi{}{10}^{3}$ fm${}^{\ensuremath{-}1}$. The astrophysical $S$ factor $S(0)$ for the $^{22}\mathrm{Mg}$($p,\ensuremath{\gamma}$) reaction was determined to be $0.96\ifmmode\pm\else\textpm\fi{}0.11$ keV b. The consequences for nuclear astrophysics are discussed.

Published
2010

33. Identified particle production, azimuthal anisotropy, and interferometry measurements inAu+Aucollisions atsNN=9.2GeV

Author

G. Lin, P. Kurnadi, P. Djawotho, M. Heinz, Lee Stuart Barnby, J. E. Draper, M. J. Skoby, Frank Jm Geurts, E. Elhalhuli, Jifa Tian, J. Engelage, F. Benedosso, A. G. Knospe, Jaroslav Bielcik, T. G. Dedovich, A. Geromitsos, William Jacobs, Premomoy Ghosh, J. M. Landgraf, C-Q. Li, M. R. Dutta Mazumdar, T. Sakuma, S. C. Phatak, V. Fine, Russell Richard Betts, M. Strikhanov, Y. Xu, O. V. Rogachevskiy, R. P. Scharenberg, Christina Markert, M. K. Mitrovski, Shoko Sakai, H. S. Matis, H. Masui, Zhibing Li, Jake Y. Chen, E. Hjort, Y. F. Wu, D. G. Underwood, A. Ridiger, Christine Nattrass, B. Haag, J. Konzer, L. Didenko, J. C. Dunlop, K. Yip, K. Kang, K. Kajimoto, Saskia Mioduszewski, Mikhail Tokarev, W. A. Love, Zebo Tang, H. Caines, Ki-Seok Choi, M. Zawisza, H. M. Spinka, L. Xue, J. Lauret, Zubayer Ahammed, J. S. Wang, R. R. Debbe, Y. Wang, Thomas Humanic, E. P. Sichtermann, Y. Zoulkarneeva, C. Zhong, T. S. McShane, R. Lednicky, M. J. LeVine, J. M. Joseph, J. H. Thomas, G. Odyniec, J. Sandweiss, Z. Chajecki, D. D. Koetke, D. Kettler, J. Balewski, Madan M. Aggarwal, N. Xu, S. Timoshenko, Fuqiang Wang, P. Filip, L. Kotchenda, Q. Wang, M. J. Russcher, G. S. Averichev, J. Ulery, Rashmi Raniwala, I. Koralt, T. R. Schuster, C. Perkins, Ilya Selyuzhenkov, J. M. Rehberg, R. S. Longacre, H. G. Ritter, H. Z. Huang, L. H. Tarini, Sergei A. Voloshin, J. C. Webb, T. Peitzmann, J. L. Drachenberg, S. Zhang, L. V. Nogach, M. J. Ng, V. I. Kravtsov, P. Pile, G. D. Westfall, Claude Andre Pruneau, Sadhana Dash, O. Barannikova, R. Bellwied, I. Bnzarov, T. J. Hallman, E. G. Judd, G. J. van Nieuwenhuizen, T. J. M. Symons, Anthony Robert Timmins, C. L. Jones, S. Baumgart, Jing Zhou, Matthew Walker, Mirko Planinic, Jay Roberts, D. Thein, Adam Ryszard Kisiel, I. Sakrejda, Marcelo Gameiro Munhoz, D. J. Prindle, D. Tlusty, W. L. Zhan, S. Vokal, Y. Fisyak, A. Gupta, Petr Jákl, T. Ullrich, L. C. De Silva, Frank Simon, D. R. Gangadharan, Donika Plyku, P. Chung, S. M. Guertin, William Axel Leight, X. Zhu, S. R. Klein, T. Tarnowsky, N. L. Subba, M. A. Lisa, Debasish Das, Raghunath Sahoo, M. A.C. Lamont, Mateusz Andrzej Ploskon, R. Witt, R. Zoulkarneev, Vitaly Okorokov, R. Fatemi, Michael Joseph Betancourt, D. P. Mahapatra, M. Kopytine, D. L. Olson, L. C. Bland, Bernd Surrow, J. Kiryluk, J. H. Chen, Yifu Sun, W. Zhou, Y. P. Viyogi, Y. Yang, V. Yu Khodyrev, S. LaPointe, N. Li, Wei Xie, R. S. Hollis, Subrata Pal, Donald M. McDonald, L. Eun, A. A. Derevschikov, G. Igo, B. K. Srivastava, D. A. Morozov, G. M.S. Vasconcelos, X. L. Wang, K. Krueger, M. C. Suarez, C. A. Whitten, Feng Jin, Pawan Kumar Netrakanti, J. A. Vanfossen, J. Bouchet, A. Szanto de Toledo, B. Erazmus, J. Kapitan, L. Ruan, G. Wang, Qian Yue, A. V. Brandin, H. Okada, C. A. Gagliardi, K. Kauder, W. Xu, S. Margetis, R. Corliss, M. Pachr, T. D. S. Stanislaus, X. Dong, Y. Pandit, George Stephans, T. Pawlak, Y. Zhao, R. Varma, A. Rose, James Prewitt Hays-Wehle, Yu A. Matulenko, B. S. Page, Neeraj Gupta, D. Cebra, M. Estienne, A. V. Alakhverdyants, X. Lin, Z. J. Sun, H. H. Wieman, S. J. Lindenbaum, N. Schmitz, B. Grube, Q. H. Xu, Jongmin Lee, D. P. Kikola, L. K. Mangotra, R. L. Ray, P. Seyboth, B. Stringfellow, D. Staszak, R. N. Singaraju, E. Shahaliev, L. Huo, A. P. Meschanin, R. Manweiler, W. Guryn, R. Derradi de Souza, B. I. Abelev, T. Ljubicic, O. G. Grebenyuk, Jianping Cheng, Sudhir Raniwala, B. D. Anderson, J. Fedorisin, V. Ghazikhanian, J. G. Cramer, M. J. M. Codrington, M. Cherney, A. Kechechyan, Andre Mischke, Lokesh Kumar, M. Krus, R. Cendejas, Jana Bielcikova, Prabhat Ranjan Pujahari, J. L. Romero, M. Sharma, N. K. Pruthi, N. G. Minaev, E. Finch, G. Eppley, Xu Cai, J. Pluta, Jie Liu, Y. H. Zhu, Gerald W Hoffmann, J. Seele, Hanna Paulina Zbroszczyk, D. R. Beavis, J. W. Harris, R. Reed, P. Yepes, A. H. Tang, W. M. Zhang, Andrey Vasiliev, O. I. Mall, L-X. Han, M. Calderon De La Barca Sanchez, O. Catu, A. Kocoloski, P. G. Jones, Yu-Gang Ma, A. Hirsch, W. J. Llope, Janet Elizabeth Seger, A. M. Hoffman, Y. Li, T. Kollegger, F. Liu, Edmundo Javier Garcia-Solis, Ascelin Gordon, R. D. Majka, J. Sowinski, R. F. Clarke, J. Schambach, L. G. Efimov, Anju Bhasin, R. P. Redwine, Haiyan Wang, A. Lebedev, X. M. Sun, P. Sorensen, M. Shao, G. Van Buren, S. S. Shi, T. W. Ludlam, J. M. Nelson, W. Peryt, P. Fachini, Peter Martin Jacobs, D. J. Hofman, J. Takahashi, S. B. Nurushev, Bedangadas Mohanty, R. G. Fersch, M. Wada, Robert E. Tribble, I. K. Yoo, M. DePhillips, Michal Sumbera, A. A. P. Suaide, Hank Crawford, S. W. Wissink, Y. Zhang, Nikola Poljak, Y. N. Gorbunov, B. V. K. S. Potukuchi, Wolfgang Korsch, A. Bridgeman, J. Putschke, A. Ogawa, H. F. Chen, Thomas A. Trainor, Basanta Kumar Nandi, B. Biritz, A. M. Poskanzer, T. P. Burton, C. Roy, P. Chaloupka, B. E. Bonner, O. D. Tsai, S. Kabana, S. Trentalange, M. Elnimr, M. C. Cervantes, H. Liu, V. N. Tram, R. Milner, D. Arkhipkin, A. Hamed, Sevil Salur, E. Braidot, A. Iordanova, A. K. Bhati, D. Keane, R. Stock, Xiaoping Zhang, C-H. Lee, T. K. Nayak, Y. Panebratsev, D. Grosnick, V. Kouchpil, Z. Z. Xu, Samuel Heppelmann, Nikita Smirnov, Guo-Liang Ma, A. Chikanian, Z. P. Zhang, P. Kravtsov, F. Videbæk, G. Webb, M. S. Ganti, H. Bichsel, W. Christie, Chitrasen Jena, Y. P. Lu, V. Perevoztchikov, Sunil Dogra, S. Bueltmann, Subhasis Chattopadhyay, and Elena Bruna

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Time projection chamber, Meson, 010308 nuclear & particles physics, Nuclear Theory, Elliptic flow, Hadron, Elementary particle, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Quark–gluon plasma, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, STAR detector
Abstract

We present the first measurements of identified hadron production, azimuthal anisotropy, and pion interferometry from Au + Au collisions below the nominal injection energy at the BNL Relativistic Heavy-Ion Collider (RHIC) facility. The data were collected using the large acceptance solenoidal tracker at RHIC (STAR) detector at root s(NN) = 9.2 GeV from a test run of the collider in the year 2008. Midrapidity results on multiplicity density dN/dy in rapidity y, average transverse momentum , particle ratios, elliptic flow, and Hanbury-Brown-Twiss (HBT) radii are consistent with the corresponding results at similar root s(NN) from fixed-target experiments. Directed flow measurements are presented for both midrapidity and forward-rapidity regions. Furthermore the collision centrality dependence of identified particle dN/dy, , and particle ratios are discussed. These results also demonstrate that the capabilities of the STAR detector, although optimized for root s(NN) = 200 GeV, are suitable for the proposed QCD critical-point search and exploration of the QCD phase diagram at RHIC.

Published
2010

34. Continuum spectroscopy with aC10beam: Cluster structure and three-body decay

Author

Rebecca Shane, L. Trache, R. J. Charity, Robert E. Tribble, K. Mercurio, T. D. Wiser, A. H. Wuosmaa, A. Banu, and L. G. Sobotka

Subjects
Physics, Nuclear and High Energy Physics, Proton decay, Excited state, Hadron, High Energy Physics::Experiment, Alpha decay, Atomic physics, Nuclear Experiment, Nucleon, Ground state, Isotopes of beryllium, Radioactive decay
Abstract

Resonance-decay spectroscopy is used to study particle-unbound excited states produced in interactions of $E/A=10.7 \mathrm{MeV}$ $^{10}\mathrm{C}$ on Be and C targets. After inelastic scattering, structures associated with excited states in $^{10}\mathrm{C}$ were observed at 5.22, 5.29, 6.55, 6.56, 6.57, and 8.4 MeV which decay into the $2p+2\ensuremath{\alpha}$ final state. This final state is created via a number of different decay paths, which include prompt and sequential two-proton decay to the ground state of $^{8}\mathrm{Be}$, $\ensuremath{\alpha}$ decay to $^{6}\mathrm{Be}{}_{\mathrm{g}.\mathrm{s}.}$, and proton decay to the 2.345-MeV state of $^{9}\mathrm{B}$. For the sequential two-proton decay states (5.22 and 6.55 MeV), angular correlations between the first two decay axes indicate that the spin of these states are nonzero. For the prompt two-proton decay of the 5.29-MeV state, the three-body correlations between the two protons and the core are intermediate between those measured for ground-state $^{6}\mathrm{Be}$ and $^{45}\mathrm{Fe}$ decays. The 6.55- and 6.57-MeV structures are most probably associated with the same level, which has a 14% two-proton decay branch with a strong ``diproton'' character and a 86% sequential two-proton decay branch. Correlations between the fragments following the three-body decay of the 2.345-MeV state of $^{9}\mathrm{B}$ can be approximately described by sequential $\ensuremath{\alpha}$ decay to the $^{5}\mathrm{Li}$ intermediate state. The 8.06- and 9.61-MeV $^{10}\mathrm{B}$ states that decay into the $d+^{6}\mathrm{Li}{}_{2.186}$ channel are confirmed. Evidence for cluster structure in $^{13}\mathrm{N}$ is obtained from a number of excited states that decay into the $p+3\ensuremath{\alpha}$ exit channel.

Published
2009

35. Improved determination of the astrophysicalS(0)factor of theN15(p,α)C12reaction

Author

A. M. Mukhamedzhanov, Robert E. Tribble, V. Z. Goldberg, M. La Cognata, and C. Spitaleri

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Carbon-12, Alpha decay, Residual energy, R-matrix
Abstract

We present new improved $R$ matrix fits of direct data and indirect Trojan Horse data for the $^{15}\mathrm{N}(p,\ensuremath{\alpha})^{12}\mathrm{C}$ reaction and provide a more accurate recommended value of $S(0)=73.0\ifmmode\pm\else\textpm\fi{}5.0$ MeV b from direct Redder data [A. Redder et al., Z. Phys. A 305, 325 (1982)] and $S(0)=70.0\ifmmode\pm\else\textpm\fi{}13.5$ MeV b from the Trojan Horse data [M. La Cognata et al., Phys. Rev. C 76, 065804 (2007)]. We also analyze a recent fit by Barker [F. C. Barker, Phys. Rev. C 78, 044611 (2008)] and demonstrate that when all the uncertainties are taken into account, our results overlap with his. We also provide a fit of the Trojan Horse data that properly takes into account finite residual energy resolution of the data.

Published
2009

36. Light emission from a Ag target bombarded by multiply-charged Ar ions

Author

Robert E. Tribble, Chahiar Assad, and Wenzhong Liu

Subjects
Nuclear and High Energy Physics, Ion beam deposition, Ion beam, Physics::Plasma Physics, Chemistry, Yield (chemistry), Light emission, Atomic physics, Kinetic energy, Ion gun, Instrumentation, Ion
Abstract

Light emitted by Ag atoms following the bombardment of a Ag target with Ar ions has been studied. Light yields that include contributions from both displaced surface and sputtered atoms have been obtained as a function of incident ion beam kinetic energy and with different Ar ion charge states. No change in the light yield was observed as the incident ion charge state was varied. The light yield was found to increase by nearly a factor of 10 as the ion beam kinetic energy changed from 8 to 100 keV.

Published
1991

37. New astrophysicalSfactor for theN15(p,γ)O16reaction via the asymptotic normalization coefficient (ANC) method

Author

J. Mrazek, A. M. Mukhamedzhanov, J. Vincour, M. La Cognata, V. Kroha, Robert E. Tribble, Z. Hons, Pavel Bem, Jan Novák, Eva Simeckova, R. G. Pizzone, L. Trache, C. A. Gagliardi, C. Spitaleri, S. Romano, V. Z. Goldberg, V. Burjan, A. Plunkett, S. Piskor, and Frantisek Vesely

Subjects
Physics, Nuclear and High Energy Physics, Proton, Helium-3, Excited state, Carbon-12, Atomic physics, Born approximation, Ground state, Oxygen-16, R-matrix
Abstract

The ${}^{15}\mathrm{N}(p,\ensuremath{\gamma}){}^{16}\mathrm{O}$ reaction provides a path from the CN cycle to the CNO bi-cycle and CNO tri-cycle. The measured astrophysical factor for this reaction is dominated by resonant capture through two strong ${J}^{\ensuremath{\pi}}={1}^{\ensuremath{-}}$ resonances at ${E}_{R}=312$ and 962 keV and direct capture to the ground state. Asymptotic normalization coefficients (ANCs) for the ground and seven excited states in $^{16}\mathrm{O}$ were extracted from the comparison of experimental differential cross sections for the $^{15}\mathrm{N}$($^{3}\mathrm{He}$,$d)$$^{16}\mathrm{O}$ reaction with distorted-wave Born approximation calculations. Using these ANCs and proton and \ensuremath{\alpha} resonance widths determined from an $R$-matrix fit to the data from the ${}^{15}\mathrm{N}(p,\ensuremath{\alpha}){}^{12}\mathrm{C}$ reaction, we carried out an $R$-matrix calculation to obtain the astrophysical factor for the ${}^{15}\mathrm{N}(p,\ensuremath{\gamma}){}^{16}\mathrm{O}$ reaction. The results indicate that the direct capture contribution was previously overestimated. We find the astrophysical factor to be $S(0)=36.0\ifmmode\pm\else\textpm\fi{}6.0$ keV b, which is about a factor of 2 lower than the presently accepted value. We conclude that for every $2200\ifmmode\pm\else\textpm\fi{}300$ cycles of the main CN cycle one CN catalyst is lost due to this reaction.

Published
2008

38. First observation ofα-cluster states in the14O + 4Heinteraction

Author

Changbo Fu, Y. Zhai, B. B. Skorodumov, Robert E. Tribble, M. McCleskey, G. Tabacaru, L. Trache, V. Z. Goldberg, Grigory Rogachev, G. G. Chubarian, and Tariq Al-Abdullah

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Helium-4, Proton, Meson, Resonance, Alpha particle, Atomic physics, Excitation, R-matrix
Abstract

We measured ${}^{14}\mathrm{O}+{}^{4}\mathrm{He}$ excitation functions for elastic scattering which demonstrate, for the first time, a well developed $\ensuremath{\alpha}$-cluster structure in the proton rich nucleus, ${}^{18}\mathrm{Ne}$. We present the excitation energies and estimates of the spins for the dominant resonances using an R-matrix approach. A resonance at 9.2 MeV excitation energy in ${}^{18}\mathrm{Ne}$ is particularly interesting. The spin-parity of the state is found to be ${3}^{\ensuremath{-}}$ and the $\ensuremath{\alpha}$ particle reduced width for the state appears to be comparable to the single particle limit. We have found indications for unusually large size of the observed $\ensuremath{\alpha}$-cluster configuration.

Published
2008

39. The Frontiers of Nuclear Science: A New Long Range Plan for the United States

Author

Robert E. Tribble, Livius Trache, and Sabin Stoica

Subjects
Engineering management, Engineering, Operations research, business.industry, Advisory committee, ComputerApplications_COMPUTERSINOTHERSYSTEMS, Plan (drawing), Nuclear science, business, Range (computer programming)
Abstract

The U.S. Nuclear Science Advisory Committee has developed a new Long Range Plan to guide the program over the next decade. The new plan recommends a program of upgrades and new construction to move the U.S. nuclear physics program into the next decade. An overview of the plan is provided.

Published
2008

40. Astrophysical S‐factor of the 12N(p,γ)13O Reaction in Relation to Population III Star Evolution

Author

C. A. Gagliardi, Robert E. Tribble, Changbo Fu, F. Carstoiu, Y. Zhai, G. Tabacaru, L. Trache, V. Burjan, A. Banu, T. Al.‐Abdullah, and M. McCleskey

Subjects
Physics, Proton–proton chain reaction, Elastic scattering, education.field_of_study, Proton, S-factor, Nuclear Theory, Population, Nuclear physics, Supernova, Radiative transfer, Atomic physics, Nuclear Experiment, education, Stellar evolution
Abstract

The reaction cross section for the direct radiative proton capture on the the drip line nucleus 12N—12N(p,γ)13O—was studied at the Cyclotron Institute/Texas A&M University using the indirect asymptotic normalization coefficient method. This reaction is important in the hot pp chain nuclear burning processes in hydrogen‐rich massive objects (Population III stars). The astrophysical S‐factor of the direct proton capture was determined at zero energy yielding a value of S1–12DC = 0.31(5) keV b. Interference between direct and resonant capture leads to a further enhancement of a factor of two.

Published
2008

41. Light emission from Na atoms sputtered by multiply-charged Ar ions

Author

M. H. Prior, R.G. Stokstad, and Robert E. Tribble

Subjects
Nuclear and High Energy Physics, Argon, Target surface, Chemistry, chemistry.chemical_element, Charge (physics), Ion, Physics::Plasma Physics, Yield (chemistry), Light emission, Atomic physics, Instrumentation, Intensity (heat transfer), Beam (structure)
Abstract

Light emitted by Na atoms, following the bombardment of a NaCl target with multiple-charged argon ions at 48 keV, has been studied for charge states 4+, 8+ and 12+. The yield of the unresolved Na D lines was observed as a function of the distance from the target surface and the intensity of the beam as well as the charge state of the incoming ion. The yield of the sputtered Na atoms varied linearly with the beam intensity but was independent of the charge state of the Ar ion. The light yield from the surface of the target increased with the charge state of the Ar ion.

Published
1990

42. AstrophysicalS(E)factor of theN15(p,α)C12reaction at sub-Coulomb energies via the Trojan horse method

Author

Changbo Fu, Claudio Spitaleri, D. Schmidt, B. F. Irgaziev, Aurora Tumino, R. G. Pizzone, V. Z. Goldberg, S. Romano, A. M. Mukhamedzhanov, Livius Trache, Silvio Cherubini, Marisa Gulino, V. Crucillà, M. La Cognata, G. Tabacaru, Robert E. Tribble, and L. Lamia

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Light nucleus, Scattering, Energy interval, Carbon-12, Coulomb, Atomic physics, E factor, R-matrix
Abstract

The low-energy bare-nucleus cross section for $^{15}\mathrm{N}$$(p,\ensuremath{\alpha})$$^{12}\mathrm{C}$ is extracted by means of the Trojan horse method applied to the $^{2}\mathrm{H}$($^{15}\mathrm{N}$,$\ensuremath{\alpha}$$^{12}\mathrm{C}$)$n$ reaction at ${E}_{\mathrm{beam}}=60$ MeV. For the first time we applied the modified half-off-energy-shell resonant $R$-matrix method that takes into account off-energy-shell effects and initial- and final-state interactions. In particular it has been shown that inclusion of Coulomb $^{15}\mathrm{N}$$\text{\ensuremath{-}}d$ scattering and off-shell effects do not affect the determination of the astrophysical factor. Also the simple plane-wave approximation used in previous analyses is justified. The results extracted via the Trojan horse method are compared to direct data in the same energy region and show very good agreement in the energy interval 70--312 keV. These results confirm the extrapolations of the $S$ factor reported in literature.

Published
2007

43. Forward Λ production and nuclear stopping power ind+Aucollisions atsNN=200GeV

Author

T. S. McShane, F. Laue, A. Szanto de Toledo, B. Erazmus, J. Kapitan, S. M. Dogra, P. Kurnadi, S. Baumgart, L. Kotchenda, M. S. Ganti, H. Bichsel, Zhenyu Zhang, Reinhard Stock, T. Pawlak, T. Dietel, M. R. Cosentino, Mirko Planinic, Vitaly Okorokov, W. Christie, K. Kang, T. P. Burton, F. Benedosso, Saskia Mioduszewski, X. Lin, V. Perevoztchikov, Bernd Surrow, X. L. Wang, E. W. Hughes, V. V. Belaga, J. Speltz, P. Sorensen, S. R. Klein, Jichao Wang, T. Tarnowsky, N. L. Subba, K. L. Kowalik, Y. N. Gorbunov, L. Didenko, L. K. Mangotra, D. L. Olson, C. Zhong, Y. P. Viyogi, A. A. Derevschikov, J. Engelage, M. DePhillips, R. Manweiler, B. Grube, P. G. Jones, A. N. Zubarev, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, M. Zawisza, H. M. Spinka, V. Ghazikhanian, M. van Leeuwen, X. Dong, A. M. Poskanzer, Pawan Kumar Netrakanti, T. G. Dedovich, K. S.F.F. Guimaraes, J. Ulery, J. W. Harris, C-Q. Li, David Jonathan Hofman, T. Sakuma, Marcelo Gameiro Munhoz, D. J. Prindle, H. G. Ritter, R. P. Scharenberg, Christina Markert, H. Z. Huang, Subhasis Chattopadhyay, B. V.K.S. Potukuchi, Anju Bhasin, A. Bravar, M. Sharma, Michal Sumbera, J. L. Drachenberg, Yu-Gang Ma, A. Hirsch, S. C. Phatak, H. S. Matis, Premomoy Ghosh, J. M. Landgraf, D. P. Mahapatra, R. S. Hollis, O. Barannikova, William Jacobs, R. Bellwied, J. H. Thomas, A. Kechechyan, Andre Mischke, E. M. Kislov, J. G. Cramer, L. Gaillard, L. C. Bland, C. A. Gagliardi, M. L. Miller, P. Fachini, A. Stadnik, Anthony R. Timmins, Hank Crawford, N. G. Minaev, Marek Bombara, V. Fine, J. Lauret, A. Lebedev, N. van der Kolk, M. Strikhanov, Yuanfang Wu, R. Lednicky, Peter Martin Jacobs, M. A. Lisa, L. Ruan, A. A. Kuznetsov, Xiangming Sun, L. Liu, N. Gupta, Christine Nattrass, O. G. Grebenyuk, Y. Bai, R. L. Ray, J. L. Romero, E. Potrebenikova, D. Kettler, M. J. M. Codrington, M. M. de Moura, I-K. Yoo, S. L. Blyth, A. Feng, H. Caines, Y. Lu, P. Yepes, V. Eckardt, M. C. Suarez, Renaud Vernet, P. Filip, V. B. Dunin, Basanta Kumar Nandi, D. Staszak, Madan M. Aggarwal, Fuqiang Wang, Sergey Timoshenko, Guo-Liang Ma, J. Fedorisin, M. Kopytine, J. Fu, A. Chikanian, S. W. Wissink, J. Sandweiss, S. B. Nurushev, Jay Roberts, R. Snellings, G. Odyniec, N. K. Pruthi, Y. Zoulkarneeva, G. D. Westfall, I. Selyuzhenkov, T. Ljubicic, G. S. Averichev, M. Oldenburg, P. S. Sazhin, C. Roy, E. Finch, Z. Xu, G. Lin, M. Potekhin, P. Djawotho, A. G. Knospe, Russell Richard Betts, J. Baudot, W. Zhan, Sudhir Raniwala, Q. Yue, J. Takahashi, B. D. Anderson, J. C. Webb, P. Kravtsov, G. Van Buren, M. S. Daugherity, Nikola Poljak, David Lynn, D. G. Underwood, S. S. Shimanskiy, Petr Jákl, W. J. Llope, D. Relyea, A. Ogawa, E. P. Sichtermann, N. T. Porile, T. D. S. Stanislaus, Y. Li, M. J. Russcher, H. F. Chen, Thomas A. Trainor, W. R. Edwards, H. Gos, P. Chaloupka, H. H. Wieman, G. Eppley, T. W. Ludlam, J. Sowinski, Xu Cai, M. J. Horner, J. Pluta, A. I. Kulikov, A. Kumar, V. I. Yurevich, R. Varma, Yufeng Zhang, J. Balewski, Rashmi Raniwala, W. M. Zhang, Andrey Vasiliev, M. Shao, J. Callner, Yu A. Matulenko, J. M. Nelson, A. H. Tang, H. Liu, M. Botje, J. E. Draper, Claude Andre Pruneau, T. J. Hallman, T. J. M. Symons, F. Du, Nu Xu, R. Witt, J. G. Ma, W. Peryt, Janet Elizabeth Seger, D. Arkhipkin, Bedangadas Mohanty, A. Hamed, S. U. Chung, Wen-Qing Shen, B. Stringfellow, Frank Simon, A. M. Hoffman, M. Pachr, A. Iordanova, V. Yu Khodyrev, Subrata Pal, L. V. Nogach, T. Ullrich, A. I. Pavlinov, B. K. Srivastava, I. M. Vasilevski, Gerald W Hoffmann, F. Liu, R. Zoulkarneev, L. G. Efimov, M. Calderon De La Barca Sanchez, M. Heinz, Lee Stuart Barnby, J. Liu, O. Catu, C. A. Whitten, V. I. Kravtsov, Jaroslav Bielcik, R. D. Majka, S. Bhardwaj, Boris Hippolyte, D. Cebra, J. C. Dunlop, J. H. Chen, A. Kocoloski, M. Bystersky, Q. Li, S. Trentalange, S. Dash, J. Y. Chen, M. Estienne, S. Margetis, R. F. Clarke, J. Schambach, Yu Melnick, Morton Kaplan, M. R. Dutta Mazumdar, Robert E. Tribble, Zubayer Ahammed, M. J. LeVine, F. Jia, S. Lange, N. Schmitz, O. V. Rogachevskiy, Jana Bielcikova, S. J. Lindenbaum, E. Shahaliev, W. A. Love, Alexandre Shabetai, W. T. Waggoner, A. M. Vander Molen, B. Haag, E. Hjort, Y. Wang, I. A. Qattan, Z. Chajecki, C. Perkins, Thomas Humanic, B. E. Bonner, O. D. Tsai, S. Kabana, M. C. Cervantes, R. Fatemi, Sevil Salur, K. Krueger, Q. H. Xu, Thomas Peitzmann, Y. Panebratsev, D. Grosnick, V. Kouchpil, M. Wada, Z. J. Sun, W. He, M. Cherney, Thomas Michael Cormier, M. Sarsour, Samuel Heppelmann, Mikhail Tokarev, E. Garcia-Solis, R. N. Singaraju, A. P. Meschanin, J. Zhou, Adam Ryszard Kisiel, R. S. Longacre, S. Vokal, Debasish Das, Raghunath Sahoo, M. A.C. Lamont, A. Bellingeri-Laurikainen, G. Igo, V. Emelianov, A. K. Bhati, D. Keane, J. Bouchet, Y. Fisyak, J. Millane, Andrew Rose, Y. Zhao, Nikolai Smirnov, J. Mitchell, J. Kiryluk, H. Zhang, E. G. Judd, D. A. Morozov, S. Lehocka, I. Sakrejda, C-H. Lee, T. K. Nayak, A. Ridiger, Thorsten Sven Kollegger, J. X. Zuo, G. Wang, J. Wu, P. Seyboth, L. Martin, S. LaPointe, D. D. Koetke, C. J. McClain, C. Nepali, Jorn Henning Putschke, B. I. Abelev, A. V. Brandin, Sergei A. Voloshin, J. P. Coffin, Jianping Cheng, T. W. Henry, S. E. Vigdor, and Christian Claude Kuhn

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, media_common.quotation_subject, Nuclear Theory, Hadron, Lambda, 01 natural sciences, 7. Clean energy, Asymmetry, Particle identification, Nuclear physics, Baryon, 0103 physical sciences, Stopping power (particle radiation), Nuclear Experiment, 010306 general physics, Nucleon, Relativistic Heavy Ion Collider, media_common
Abstract

We report the measurement of {lambda} and {lambda} yields and inverse slope parameters in d+Au collisions at {radical}(s{sub NN})=200 GeV at forward and backward rapidities (y={+-}2.75), using data from the STAR forward time projection chambers. The contributions of different processes to baryon transport and particle production are probed exploiting the inherent asymmetry of the d+Au system. Comparisons to model calculations show that baryon transport on the deuteron side is consistent with multiple collisions of the deuteron nucleons with gold participants. On the gold side, HIJING-based models without a hadronic rescattering phase do not describe the measured particle yields, while models that include target remnants or hadronic rescattering do. The multichain model can provide a good description of the net baryon density in d+Au collisions at energies currently available at the BNL Relativistic Heavy Ion Collider, and the derived parameters of the model agree with those from nuclear collisions at lower energies.

Published
2007

44. Rapidity and species dependence of particle production at large transverse momentum ford+Aucollisions atsNN=200GeV

Author

G. Sood, A. Tai, J. Engelage, J. Amonett, John N. Wood, G. Eppley, N. Gupta, Anju Bhasin, R. N. Singaraju, A. P. Meschanin, Wen-Qing Shen, Jay Roberts, V. Emelianov, A. K. Bhati, D. Keane, Premomoy Ghosh, J. M. Landgraf, A. N. Zubarev, C. F. Moore, F. Retiere, J. Pluta, H. Liu, J. C. Dunlop, Zubayer Ahammed, M. J. LeVine, F. Jia, M. Heinz, N. G. Minaev, Manish Sharma, A. Lebedev, A. Ridiger, Thorsten Sven Kollegger, M. Strikhanov, Nikolai Smirnov, R. Stock, J. Mitchell, L. G. Efimov, P. Fachini, Lee Stuart Barnby, Souvik Das, A. Chikanian, R. Witt, Vladimir Petrov, A. Stolpovsky, C. Mironov, M. M. de Moura, V. Yu Khodyrev, S. L. Blyth, K. S.F.F. Guimaraes, M. Calderon De La Barca Sanchez, Y. Fisyak, W. J. Llope, M. Botje, J. Sandweiss, Z. Liu, B. K. Srivastava, I. M. Vasilevski, S. Bhardwaj, Boris Hippolyte, C-H. Lee, T. K. Nayak, L. K. Mangotra, M. Pachr, Jaroslav Bielcik, L. Kotchenda, S. Hepplemann, N. Xu, P. Filip, O. Catu, S. Lehocka, R. S. Longacre, Sergey Voloshin, Sergey Timoshenko, Christine Nattrass, R. Manweiler, A. Wetzler, R. Fatemi, K. Krueger, G. D. Westfall, D. K. Mishra, Petr Jákl, H. Long, S. R. Klein, T. Tarnowsky, M. R. Dutta Mazumdar, A. Kocoloski, Q. Li, E. M. Kislov, J. G. Cramer, L. Martin, D. D. Koetke, J. E. Draper, C. J. McClain, J. W. Harris, O. V. Rogachevskiy, A. M. Poskanzer, G. Wang, P. Seyboth, D. L. Olson, Robert E. Tribble, Debasish Das, Raghunath Sahoo, M. A.C. Lamont, W. Christie, A. A. Derevschikov, K. Kang, A. I. Kulikov, M. J. Horner, D. Arkhipkin, Jie Liu, Y. Panebratsev, D. Grosnick, J. Takahashi, V. Kouchpil, J. W. Watson, J. P. Coffin, W. M. Zhang, F. Laue, A. Szanto de Toledo, J. Kapitan, A. Kechechyan, Andre Mischke, Anthony R. Timmins, Andrey Vasiliev, J. Baudot, W. Zhan, A. Bellingeri-Laurikainen, G. Igo, J. Bouchet, S. M. Dogra, R. Picha, M. Kramer, P. Yepes, V. Eckardt, E. Sugarbaker, W. A. Love, V. V. Belaga, Renaud Vernet, H. Z. Huang, S. Vokal, I. K. Yoo, Y. G. Gorbunov, A. Ogawa, P. Sorensen, S. M. Guertin, Alexandre Alarcon Do Passo Suaide, T. W. Henry, A. H. Tang, T. J. Humanic, H. F. Chen, Peter Graham Jones, S. Bekele, J. Millane, Jichao Wang, Shengli Huang, Thomas A. Trainor, W. R. Edwards, C. A. Whitten, T. Pawlak, D. P. Mahapatra, N. Schmitz, N. T. Porile, E. Shahaliev, Janet Elizabeth Seger, W. He, C-Q. Li, Madan M. Aggarwal, A. M. Hoffman, Beomkyu Kim, L. Didenko, D. Thein, M. Cherney, M. L. Miller, J. Kiryluk, R. P. Scharenberg, Christina Markert, Fuqiang Wang, Thomas Michael Cormier, R. Varma, X. Lin, P. Djawotho, A. I. Pavlinov, Andrew Rose, Y. Zhao, H. S. Matis, Yu A. Matulenko, S. Lange, M. Oldenburg, Jana Bielcikova, A. M. Vander Molen, Joseph Adams, S. J. Lindenbaum, D. A. Morozov, F. Liu, J. Porter, B. Stringfellow, M. Sarsour, M. Kopytine, J. Fu, V. A. Nikitin, T. S. McShane, E. G. Judd, W. W. Jacobs, D. Magestro, M. Tokarev, E. Hjort, J. Lauret, Q. H. Xu, B. Haag, K. Schweda, V. I. Yurevich, Z. J. Sun, T. D. Gutierrez, R. D. Majka, R. Lednicky, L. Molnar, J. E. Gonzalez, B. E. Bonner, Gregory Rakness, B. V.K.S. Potukuchi, S. V. Razin, Bedangadas Mohanty, Yu-Gang Ma, Frank Simon, Z. Chajecki, S. Margetis, J. Schambach, H. Jiang, O. D. Tsai, T. D. S. Stanislaus, H. H. Wieman, S. Kabana, T. Dietel, Y. P. Viyogi, Mirko Planinic, Adam Ryszard Kisiel, C. Perkins, H. J. Crawford, Y. Guo, M. Lopez-Noriega, J. H. Chen, Basanta Kumar Nandi, M. Bystersky, J. Speltz, T. Peitzmann, O. G. Grebenyuk, M. DePhillips, Z. Xu, G. Lin, Michal Sumbera, Guo-Liang Ma, V. B. Dunin, Y. Bai, J. Castillo, S. W. Wissink, Y. Zhang, Nikola Poljak, J. Fedorisin, V. A. Okorokov, R. V. Cadman, Morton Kaplan, X. Z. Cai, Sevil Salur, Y. Wang, Jianhong Wu, C. Roy, D. G. Underwood, M. Swanger, A. S. Hirsch, H. Gos, A. Stadnik, P. Chaloupka, J. C. Webb, P. Kravtsov, Peter Martin Jacobs, M. Shao, Y. Lu, S. B. Nurushev, T. J. Hallman, J. Cheng, T. J. M. Symons, I. Selyuzhenkov, J. Reinnarth, J. Sowinski, G. Van Buren, W. T. Waggoner, T. W. Ludlam, J. M. Nelson, Yan Li, W. Peryt, Sukalyan Chattopadhyay, M. S. Ganti, V. Perevoztchikov, K. Filimonov, E. W. Hughes, K. L. Kowalik, Sergey Panitkin, V. Fine, Gerald W Hoffmann, Raimond Snellings, B. D. Anderson, A. Kumar, F. Du, L. V. Nogach, V. I. Kravtsov, Zhenyu Zhang, M. R. Cosentino, F. Benedosso, T. G. Dedovich, T. Sakuma, S. C. Phatak, V. Ghazikhanian, Saskia Mioduszewski, J. L. Romero, A. Shabetai, P. S. Sazhin, E. Finch, H. M. Spinka, E. P. Sichtermann, J. Balewski, Rashmi Raniwala, Claude Andre Pruneau, J. H. Thomas, T. Ullrich, R. Zoulkarneev, L. Ruan, R. L. Ray, E. Potrebenikova, T. Ljubicic, G. S. Averichev, H. Caines, Sudhir Raniwala, S. S. Shimanskiy, D. Relyea, X. L. Wang, C. Zhong, M. van Leeuwen, X. Dong, S. K. Pal, A. Bravar, Matthew J. Anderson, M. S. Daugherity, H. Zhang, L. C. Bland, J. X. Zuo, B. Erazmus, S. LaPointe, A. A. Kuznetsov, Jorn Henning Putschke, L. Liu, A. V. Brandin, S. E. Vigdor, Christian Claude Kuhn, D. Cebra, S. Trentalange, M. Estienne, Yu Melnick, H. Bichsel, G. Odyniec, Y. Zoulkarneeva, M. Potekhin, J. Ulery, H. G. Ritter, Bernd Surrow, O. Barannikova, R. Bellwied, David Lynn, M. J. Russcher, B. I. Abelev, Pawan Kumar Netrakanti, L. Gaillard, C. A. Gagliardi, N. van der Kolk, A. Hamed, J. G. Ma, Marcelo Gameiro Munhoz, D. J. Prindle, M. A. Lisa, and W. J. Dong

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, Parton, 01 natural sciences, 7. Clean energy, Gluon, Color-glass condensate, Nuclear physics, Pion, Antiproton, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics
Abstract

We determine rapidity asymmetry in the production of charged pions, protons, and antiprotons for large transverse momentum (p{sub T}) for d+Au collisions at {radical}(s{sub NN})=200 GeV. The rapidity asymmetry is defined as the ratio of particle yields at backward rapidity (Au beam direction) to those at forward rapidity (d beam direction). The identified hadrons are measured in the rapidity regions |y

Published
2007

45. Single and double proton emissions from theO14+He4interaction

Author

A. M. Mukhamedzhanov, G. Tabacaru, Grigory Rogachev, Tariq Al-Abdullah, M. McCleskey, L. Trache, Changbo Fu, V. Z. Goldberg, G. G. Chubarian, B. B. Skorodumov, Robert E. Tribble, and Y. Zhai

Subjects
Physics, Nuclear and High Energy Physics, Helium-4, Proton, Resonance, Inverse, Alpha particle, Atomic physics, Proton emission, Nuclear Experiment, Excitation, Energy (signal processing)
Abstract

We observed single and double proton emissions in the $^{14}\mathrm{O}+^{4}\mathrm{He}$ interaction by the thick target inverse kinematic (TTIK) method at initial energy for $^{14}\mathrm{O}$ at 32.7 MeV. We found that the protons mainly originate from the resonance excitation of states in $^{18}\mathrm{Ne}$. The observed states in $^{18}\mathrm{Ne}$ decay by protons mainly to proton unstable states in $^{17}\mathrm{F}$. It was found that the decay of a state in $^{18}\mathrm{Ne}$ at ${E}_{\mathrm{ex}}=8.45$ MeV demonstrates the features of a decay by a correlated proton pair. The observed properties of the $^{14}\mathrm{O}+^{4}\mathrm{He}$ interaction make a previous interpretation for the rate of $^{14}\mathrm{O}$($^{4}\mathrm{He}$, $p$)$^{17}\mathrm{F}$ at astrophysical energies suspect. We show how the TTIK method should be modified to obtain the data of astrophysical interest.

Published
2007

46. Precise half-life measurements for the superallowedβ+emittersAr34andCl34

Author

V. E. Iacob, John C. Hardy, V. E. Mayes, J. Brinkley, N. Nica, Robert E. Tribble, L. Trache, C. A. Gagliardi, G. Tabacaru, and M. Sanchez-Vega

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Antiparticle, Unitarity, Antimatter, Double beta decay, Isotopes of chlorine, Analytical chemistry, Isotopes of beryllium, Radioactive decay, Lepton
Abstract

To contribute meaningfully to any test of the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the measured ft value of a superallowed 0{sup +}{yields}0{sup +} {beta}{sup +} transition must be obtained to a precision of 0.1% or better. We have determined the half-life of the superallowed emitter {sup 34}Ar to be 843.8(4)ms; the quoted precision, 0.05%, is a factor of five improvement on the best previous measurement and meets this demanding requirement. Our measurement employed a high-efficiency gas counter, which was sensitive to positrons from both {sup 34}Ar and its daughter {sup 34}Cl. We achieved the required precision on {sup 34}Ar by analyzing the parent-daughter composite decay with a new fitting technique. We also obtained an improved half-life for {sup 34}Cl of 1.5268(5) s, which has 0.03% precision and is a factor of two improvement on previous results. As a by-product of these measurements, we determined the half-life of {sup 35}Ar to be 1.7754(11) s.

Published
2006

47. β decay of proton-rich nucleusAl23and astrophysical consequences

Author

Y. Zhai, N. Nica, J.C. Hardy, G. Tabacaru, L. Trache, V. E. Iacob, Changbo Fu, Tariq Al-Abdullah, Robert E. Tribble, and H. I. Park

Subjects
Physics, Nuclear and High Energy Physics, Proton, Branching fraction, Resonance, chemistry.chemical_element, Nuclear physics, Neon, chemistry, Nucleosynthesis, Double beta decay, Isospin, Atomic physics, Ground state
Abstract

We present the first study of the \ensuremath{\beta} decay of $^{23}\mathrm{Al}$ undertaken with pure samples. The study was motivated by nuclear astrophysics questions. Pure samples of $^{23}\mathrm{Al}$ were obtained from the momentum achromat recoil separator (MARS) of Texas A University, collected on a fast tape-transport system, and moved to a shielded location where \ensuremath{\beta} and \ensuremath{\beta}-\ensuremath{\gamma} coincidence measurements were made. We deduced \ensuremath{\beta} branching ratios and log $\mathit{ft}$ values for transitions to states in $^{23}\mathrm{Mg}$, and from them determined unambiguously the spin and parity of the $^{23}\mathrm{Al}$ ground state to be ${J}^{\ensuremath{\pi}}=5/{2}^{+}$. We discuss how this excludes the large increases in the radiative proton capture cross section for the reaction $^{22}\mathrm{Mg}(p,\ensuremath{\gamma})^{23}\mathrm{Al}$ at astrophysical energies, which were implied by claims that the spin and parity is ${J}^{\ensuremath{\pi}}=1/{2}^{+}$. The log $\mathit{ft}$ for the Fermi transition to its isobaric analog state (IAS) in $^{23}\mathrm{Mg}$ is also determined for the first time. This IAS and a state 16 keV below it are observed, well separated in the same experiment for the first time. We can now solve a number of inconsistencies in the literature, exclude strong isospin mixing claimed before, and obtain a new determination of the resonance strength. Both states are resonances in the $^{22}\mathrm{Na}$($p,\ensuremath{\gamma}$)$^{23}\mathrm{Mg}$ reaction at energies important in novae. The reactions $^{22}\mathrm{Mg}(p,\ensuremath{\gamma})^{23}\mathrm{Al}$ and $^{22}\mathrm{Na}(p,\ensuremath{\gamma})^{23}\mathrm{Mg}$ have both been suggested as possible candidates for diverting some of the flux in oxygen-neon novae explosions from the $A=22$ into the $A=23$ mass chain.

Published
2006

48. Publisher's Note: Branching ratios for the β decay ofNa21[Phys. Rev. C 74, 015501 (2006)]

Author

G. Tabacaru, L. Trache, Robert E. Tribble, H. I. Park, Y. Zhai, J. Goodwin, V. E. Iacob, J.C. Hardy, N. Nica, I. S. Towner, and C. A. Gagliardi

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Isotope, Branching fraction, Double beta decay, Spectroscopy, Isotopes of sodium, Beta decay, Radioactive decay, Dimensionless quantity
Published
2006

49. Branching ratios for theβdecay ofNa21

Author

G. Tabacaru, Robert E. Tribble, J. Goodwin, Y. Zhai, C. A. Gagliardi, John C. Hardy, I. S. Towner, L. Trache, N. Nica, V. E. Iacob, and H. I. Park

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Branching fraction, Double beta decay, Excited state, Atomic physics, Branching (polymer chemistry), Beta decay, Beta-decay stable isobars, Standard Model
Abstract

We have measured the beta-decay branching ratio for the transition from $^{21}\mathrm{Na}$ to the first excited state of $^{21}\mathrm{Ne}$. A recently published test of the standard model, which was based on a measurement of the $\ensuremath{\beta}\text{\ensuremath{-}}\ensuremath{\nu}$ correlation in the decay of $^{21}\mathrm{Na}$, depended on this branching ratio. However, until now only relatively imprecise (and, in some cases, contradictory) values existed for it. Our new result, $4.74(4)%$, reduces but does not remove the reported discrepancy with the standard model.

Published
2006

50. Determination of the direct capture contribution forN13(p,γ)O14from theO14→N13+pasymptotic normalization coefficient

Author

C. A. Gagliardi, V. Burjan, A. M. Mukhamedzhanov, B. F. Irgaziev, Changbo Fu, Florin Carstoiu, X. D. Tang, F. Pirlepesov, V. Kroha, A. Azhari, Robert E. Tribble, and L. Trache

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, CNO cycle, Excited state, Radiative capture, Atomic physics, Nucleon, Radioactive beam
Abstract

$^{13}\mathrm{N}(p,\ensuremath{\gamma})^{14}\mathrm{O}$ is one of the key reactions which trigger the onset of the hot CNO cycle. This transition occurs when the proton capture rate on $^{13}\mathrm{N}$ is faster, due to increasing stellar temperature $(\ensuremath{\geqslant}{10}^{8}\phantom{\rule{0.3em}{0ex}}\mathrm{K})$, than the $^{13}\mathrm{N}$ $\ensuremath{\beta}$-decay rate. The rate of this reaction is dominated by the resonant capture through the first excited state of $^{14}\mathrm{O}$ $({E}_{r}=0.528\phantom{\rule{0.3em}{0ex}}\text{MeV})$. However, through constructive interference, direct capture below the resonance makes a non-negligible contribution to the reaction rate. We have determined this direct contribution by measuring the asymptotic normalization coefficient for $^{14}\mathrm{O}\ensuremath{\rightarrow}^{13}\mathrm{N}+p$. In our experiment, an $11.8\phantom{\rule{0.3em}{0ex}}\text{MeV}∕\text{nucleon}$ $^{13}\mathrm{N}$ radioactive beam was used to study the $^{14}\mathrm{N}(^{13}\mathrm{N},^{14}\mathrm{O})^{13}\mathrm{C}$ peripheral transfer reaction, and the asymptotic normalization coefficient, ${({C}_{{p}_{1∕2}}^{^{14}\mathrm{O}})}^{2}=29.0\ifmmode\pm\else\textpm\fi{}4.3\phantom{\rule{0.3em}{0ex}}{\text{fm}}^{\ensuremath{-}1}$, was extracted from the measured cross section. The radiative capture cross section was estimated using an $R$-matrix approach with the measured asymptotic normalization coefficient and the latest resonance parameters. We find the $S$ factor for $^{13}\mathrm{N}(p,\ensuremath{\gamma})^{14}\mathrm{O}$ to be larger than previous estimates. Consequently, the transition from the cold to hot CNO cycle for novae would be controlled by the slowest proton capture reaction $^{14}\mathrm{N}(p,\ensuremath{\gamma})^{15}\mathrm{O}$.

Published
2004

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