Strong ${}^{\mathbf{25}}\phantom{\rule{-0.16em}{0ex}}\text{Al}+p$ resonances via elastic proton scattering with a radioactive ${}^{\mathbf{25}}\phantom{\rule{-0.16em}{0ex}}\text{Al}$ beam

Strong $^{25} Al + p$ resonances via elastic proton scattering with a radioactive $^{25} Al$ beam

J. Chen, A. A. Chen, G. Amádio, S. Cherubini, H. Fujikawa, S. Hayakawa, J. J. He, N. Iwasa, D. Kahl, L. H. Khiem, S. Kubono, S. Kurihara, Y. K. Kwon, M. La Cognata, J. Y. Moon, M. Niikura, S. Nishimura, J. Pearson, R. G. Pizzone, T. Teranishi, Y. Togano, Y. Wakabayashi, and H. Yamaguchi

Phys. Rev. C 85, 015805 – Published 13 January 2012

Abstract

$^{25} Al + p$ elastic scattering in inverse kinematics was measured to explore the level structure of $^{26} Si$ above its proton threshold. The $^{2} H (^{24} Mg, n)^{25} Al$ reaction was used to produce a 3.4 MeV/nucleon $^{25} Al$ radioactive beam with intensities of about 10 $^{6}$ ions per second on target. By using a thick target of ${({CH}_{2})}_{n}$ , a center-of-mass energy range of 3 MeV was scanned, reaching up to about 8.5 MeV in excitation energy in $^{26} Si$ . This energy range covered the region of importance for the $^{25} Al (p, γ)^{26} Si$ at temperatures characteristic of explosive nucleosynthesis. Level parameters of six strong $s$ -wave $^{25} Al + p$ resonances in $^{26} Si$ were extracted from fits to the measured excitation functions using the $R$ -matrix formalism. Two new levels have been discovered, while for two others, our spin-parity assignments disagree with the results of some previous studies. Lastly, our resonance parameters for the remaining two levels are in good agreement with past experimental work, and with recent shell-model calculations.

Received 5 October 2011

DOI:https://doi.org/10.1103/PhysRevC.85.015805

Authors & Affiliations

J. Chen^1,*, A. A. Chen¹, G. Amádio², S. Cherubini^3,4, H. Fujikawa², S. Hayakawa², J. J. He^2,†, N. Iwasa⁵, D. Kahl¹, L. H. Khiem⁶, S. Kubono², S. Kurihara², Y. K. Kwon⁷, M. La Cognata³, J. Y. Moon⁷, M. Niikura^2,‡, S. Nishimura⁹, J. Pearson¹, R. G. Pizzone³, T. Teranishi⁸, Y. Togano⁹, Y. Wakabayashi^2,§, and H. Yamaguchi²

¹Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
²Center for Nuclear Study (CNS), University of Tokyo, Wako Branch, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
³Laboratori Nazionali del Sud-INFN, Catania, Italy
⁴Dipartimento di Fisica e Astronomia, Universitá di Catania, Catania, Italy
⁵Department of Physics, Tohoku University, 6-6 Aoba, Sendai, Miyagi 980-8578, Japan
⁶Institute of Physics, Vietnamese Academy for Science and Technology (VAST), 10 Daotan, Badinh, Hanoi, 10000, Vietnam
⁷Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
⁸Department of Physics, Kyushu University, Fukuoka 852-851, Japan
⁹RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

^*chenj26@mcmaster.ca
^†Present address: Institute of Modern Physics, Chinese Academy of Sciences (CAS), Nanchang Road 509, Lanzhou 730000, China.
^‡Present address: Institut de Physique Nucléaire d'Orsay, IN2P3-CNRS, F-91406 Orsay Cedex, France.
^§Present address: Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Naka-gun, Ibaraki 319-1195, Japan.

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Vol. 85, Iss. 1 — January 2012

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Physical Review C

covering nuclear physics

Strong $^{25} Al + p$ resonances via elastic proton scattering with a radioactive $^{25} Al$ beam

J. Chen, A. A. Chen, G. Amádio, S. Cherubini, H. Fujikawa, S. Hayakawa, J. J. He, N. Iwasa, D. Kahl, L. H. Khiem, S. Kubono, S. Kurihara, Y. K. Kwon, M. La Cognata, J. Y. Moon, M. Niikura, S. Nishimura, J. Pearson, R. G. Pizzone, T. Teranishi, Y. Togano, Y. Wakabayashi, and H. Yamaguchi

Phys. Rev. C 85, 015805 – Published 13 January 2012

Abstract

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Physical Review C

covering nuclear physics

Strong 25Al+p resonances via elastic proton scattering with a radioactive 25Al beam

J. Chen, A. A. Chen, G. Amádio, S. Cherubini, H. Fujikawa, S. Hayakawa, J. J. He, N. Iwasa, D. Kahl, L. H. Khiem, S. Kubono, S. Kurihara, Y. K. Kwon, M. La Cognata, J. Y. Moon, M. Niikura, S. Nishimura, J. Pearson, R. G. Pizzone, T. Teranishi, Y. Togano, Y. Wakabayashi, and H. Yamaguchi

Phys. Rev. C 85, 015805 – Published 13 January 2012

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Strong $^{25} Al + p$ resonances via elastic proton scattering with a radioactive $^{25} Al$ beam