The cosmic-ray antiproton flux between 3 and 49 GeV

被引：170

作者：

Boezio, M

Bonvicini, V

Schiavon, P

Vacchi, A

Zampa, N

Bergström, D

Carlson, P

Francke, T

Grinstein, S

Suffert, M

Hof, M

Kremer, J

Menn, W

Simon, M

Stephens, SA

Ambriola, M

Bellotti, R

Cafagna, F

Ciacio, F

Circella, M

De Marzo, C

Finetti, N

Papini, P

Piccardi, S

Spillantini, P

Vannuccini, E

Bartalucci, S

Ricci, M

Casolino, M

De Pascale, MP

Morselli, A

Picozza, P

Sparvoli, R

Mitchell, JW

Ormes, JF

Streitmatter, RE

Bravar, U

Stochaj, SJ

机构：

[1] Univ Trieste, Dipartimento Fis, I-34147 Trieste, Italy

[2] Ist Nazl Fis Nucl, Sez Trieste, I-34147 Trieste, Italy

[3] Royal Inst Technol KTH, S-10405 Stockholm, Sweden

[4] Ctr Rech Nucl, F-67037 Strasbourg, France

[5] Univ Siegen, D-57068 Siegen, Germany

[6] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[7] Univ Bari, Dipartmento Fis, I-70126 Bari, Italy

[8] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

[9] Univ Florence, Dipartimento Fis, I-50125 Florence, Italy

[10] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy

[11] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[12] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy

[13] Ist Nazl Fis Nucl, Sez Roma, I-00133 Rome, Italy

[14] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[15] New Mexico State Univ, Las Cruces, NM 88003 USA

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 561卷 / 02期

基金：

美国国家科学基金会;

关键词：

acceleration of particles; balloons; cosmic rays; dark matter; elementary particles;

D O I：

10.1086/323366

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on a new measurement of the cosmic ray antiproton spectrum. The data were collected by the balloon-borne experiment CAPRICE98, which was flown on 1998 May 28-29 from Fort Sumner, New Mexico. The experiment used the NMSU-WiZard/CAPRICE98 balloon-borne magnet spectrometer equipped with a gas Ring Imaging Cherenkov (RICH) detector, a time-of-flight system, a tracking device consisting of drift chambers and a superconducting magnet, and a silicon-tungsten calorimeter. The RICH detector was the first ever flown capable of mass-resolving charge-one particles at energies above 5 GeV. A total of 31 antiprotons with rigidities between 4 and 50 GV at the spectrometer were identified with small backgrounds from other particles. The absolute antiproton energy spectrum was determined in the kinetic energy region at the top of the atmosphere between 3.2 and 49.1 GeV. We found that the observed antiproton spectrum and the antiproton-to-proton ratio are consistent with a pure secondary origin. However, a primary component may not be excluded.

引用

页码：787 / 799

页数：13

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