Measurement of interaction between antiprotons

被引：77

作者：

Adamczyk, L. ^{[1
]}

Adkins, J. K. ^{[2
]}

Agakishiev, G. ^{[3
]}

Aggarwal, M. M. ^{[4
]}

Ahammed, Z. ^{[5
]}

Alekseev, I. ^{[6
]}

Alford, J. ^{[7
]}

Aparin, A. ^{[3
]}

Arkhipkin, D. ^{[8
]}

Aschenauer, E. C. ^{[8
]}

Averichev, G. S. ^{[3
]}

Bairathi, V. ^{[9
]}

Banerjee, A. ^{[5
]}

Bellwied, R. ^{[10
]}

Bhasin, A. ^{[11
]}

Bhati, A. K. ^{[4
]}

Bhattarai, P. ^{[12
]}

Bielcik, J. ^{[13
]}

Bielcikova, J. ^{[14
]}

Bland, L. C. ^{[8
]}

Bordyuzhin, I. G. ^{[6
]}

Bouchet, J. ^{[7
]}

Brandenburg, J. D. ^{[15
]}

Brandin, A. V. ^{[16
]}

Bunzarov, I. ^{[3
]}

Butterworth, J. ^{[15
]}

Caines, H. ^{[17
]}

Sanchez, M. Calderon de la Barca ^{[18
]}

Campbell, J. M. ^{[19
]}

Cebra, D. ^{[18
]}

Cervantes, M. C. ^{[20
]}

Chakaberia, I. ^{[8
]}

Chaloupka, P. ^{[13
]}

Chang, Z. ^{[20
]}

Chattopadhyay, S. ^{[5
]}

Chen, J. H. ^{[21
]}

Chen, X. ^{[22
]}

Cheng, J. ^{[23
]}

Cherney, M. ^{[24
]}

Christie, W. ^{[8
]}

Contin, G. ^{[25
]}

Crawford, H. J. ^{[26
]}

Das, S. ^{[27
]}

De Silva, L. C. ^{[24
]}

Debbe, R. R. ^{[8
]}

Dedovich, T. G. ^{[3
]}

Deng, J. ^{[28
]}

Derevschikov, A. A. ^{[29
]}

di Ruzza, B. ^{[8
]}

Didenko, L. ^{[8
]}

机构：

[1] AGH Univ Sci & Technol, PL-30059 Krakow, Poland

[2] Univ Kentucky, Lexington, KY 40506 USA

[3] Joint Inst Nucl Res, Dubna 141980, Russia

[4] Panjab Univ, Chandigarh 160014, India

[5] Ctr Variable Energy Cyclotron, Kolkata 700064, India

[6] Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia

[7] Kent State Univ, Kent, OH 44242 USA

[8] Brookhaven Natl Lab, Upton, NY 11973 USA

[9] Natl Inst Sci Educ & Res, Bhubaneswar 751005, Orissa, India

[10] Univ Houston, Houston, TX 77204 USA

[11] Univ Jammu, Jammu 180001, India

[12] Univ Texas Austin, Austin, TX 78712 USA

[13] Czech Tech Univ, Fac Nucl Sci & Phys Engn, CR-11519 Prague, Czech Republic

[14] Nucl Phys Inst AS CR, Prague 25068, Czech Republic

[15] Rice Univ, Houston, TX 77251 USA

[16] Moscow Engn Phys Inst, Moscow 115409, Russia

[17] Yale Univ, New Haven, CT 06520 USA

[18] Univ Calif Davis, Davis, CA 95616 USA

[19] Ohio State Univ, Columbus, OH 43210 USA

[20] Texas A&M Univ, College Stn, TX 77843 USA

[21] Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

[22] Inst Modern Phys, Lanzhou 730000, Peoples R China

[23] Tsinghua Univ, Beijing 100084, Peoples R China

[24] Creighton Univ, Omaha, NE 68178 USA

[25] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[26] Univ Calif Berkeley, Berkeley, CA 94720 USA

[27] Inst Phys, Bhubaneswar 751005, Orissa, India

[28] Shandong Univ, Jinan 250100, Shandong, Peoples R China

[29] Inst High Energy Phys, Protvino 142281, Russia

[30] Penn State Univ, University Pk, PA 16802 USA

[31] Valparaiso Univ, Valparaiso, IN 46383 USA

[32] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[33] Univ Illinois, Chicago, IL 60607 USA

[34] Cent China Normal Univ HZNU, Wuhan 430079, Peoples R China

[35] Purdue Univ, W Lafayette, IN 47907 USA

[36] Warsaw Univ Technol, PL-00661 Warsaw, Poland

[37] Temple Univ, Philadelphia, PA 19122 USA

[38] Univ Sci & Technol China, Hefei 230026, Peoples R China

[39] Indiana Univ, Bloomington, IN 47408 USA

[40] Korea Inst Sci & Technol Informat, Daejeon 305701, South Korea

[41] Wayne State Univ, Detroit, MI 48201 USA

[42] FIAS, D-60438 Frankfurt, Germany

[43] Argonne Natl Lab, Argonne, IL 60439 USA

[44] Inst Nucl Phys PAN, PL-31342 Krakow, Poland

[45] WLCAPP, Cairo 11571, Egypt

[46] Indian Inst Technol, Mumbai 400076, Maharashtra, India

[47] Michigan State Univ, E Lansing, MI 48824 USA

[48] Pusan Natl Univ, Pusan 609735, South Korea

[49] Univ Zagreb, HR-10002 Zagreb, Croatia

[50] Univ Rajasthan, Jaipur 302004, Rajasthan, India

来源：

NATURE | 2015年 / 527卷 / 7578期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

FEMTOSCOPY; COLLISIONS;

D O I：

10.1038/nature15724

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

One of the primary goals of nuclear physics is to understand the force between nucleons, which is a necessary step for understanding the structure of nuclei and how nuclei interact with each other. Rutherford discovered the atomic nucleus in 1911, and the large body of knowledge about the nuclear force that has since been acquired was derived from studies made on nucleons or nuclei. Although antinuclei up to antihelium-4 have been discovered(1) and their masses measured, little is known directly about the nuclear force between antinucleons. Here, we study antiproton pair correlations among data collected by the STAR experiment(2) at the Relativistic Heavy Ion Collider (RHIC)(3), where gold ions are collided with a centre-of-mass energy of 200 gigaelectronvolts per nucleon pair. Antiprotons are abundantly produced in such collisions, thus making it feasible to study details of the antiproton-antiproton interaction. By applying a technique similar to Hanbury Brown and Twiss intensity interferometry(4), we show that the force between two antiprotons is attractive. In addition, we report two key parameters that characterize the corresponding strong interaction: the scattering length and the effective range of the interaction. Our measured parameters are consistent within errors with the corresponding values for proton-proton interactions. Our results provide direct information on the interaction between two antiprotons, one of the simplest systems of antinucleons, and so are fundamental to understanding the structure of more-complex antinuclei and their properties.

引用

页码：345 / +

页数：6

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