Eur. Phys. J. A (2005) 25: 327-330
https://doi.org/10.1140/epjad/i2005-06-184-y

ENAM 2004

Observation of a two-proton halo in ¹⁷Ne

¹ RIKEN, 2-1, Hirosawa, 351-0198, Wako-shi, Saitama, Japan
² Department of Physics, Cairo University, 12613, Giza, Egypt
³ Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, 700064, Kolkata, India
⁴ Virginia Commonwealth University, 23284, Richmond, VA, USA
⁵ Sanghai Institute of Nuclear Research, Chinese Academy of Sciences, 201800, Shanghai, PRC
⁶ Department of Physics, Tohoku University, 980-8578, Miyagi, Japan
⁷ Department of Electric, Electronics and Computer Engineering, Nagasaki Institute of Applied Science, 851-0193, Nagasaki, Japan
⁸ Institute of Physics, University of Tsukuba, 305-8571, Ibaraki, Japan
⁹ Department of Physics, Saitama University, 338-8570, Saitama, Japan
¹⁰ Department of Technical Physics, Peking University, 100871, Beijing, PRC

^* e-mail: ritu@triumf.ca

Received: 15 November 2004
Accepted: 25 April 2005
Published online: 3 August 2005

Abstract

The measurement of longitudinal momentum distribution for two-proton removal from the proton-drip line nucleus ¹⁷Ne with a Be target at 64 A MeV is reported. The observed narrow momentum distribution and the large interaction cross-section suggests the formation of a two-proton halo. The data analyzed within the Few-body Glauber model suggests a significant probability of the two valence protons to abnormally occupy the 2s _1/2 orbit, indicating its lowering in proton-rich nuclei.