Speaker
Young Kwan KWON
(Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea)
Description
The emission of 1.809 MeV gamma-ray from the first excited state of 26Mg followed by
beta-decay of 26Al in its ground state (26Alg.s.) has been identified by gamma-ray
telescopes such the Compton Gamma-Ray Observatory (CGRO). To resolve controversy over
the possible sources of the observational 1.809 MeV gamma-rays, one needs accurate
knowledge of the production rate of 26Al. The 25Al(p,gamma)26Si reaction which is the
competition reaction for production of 26Alg.s. is one of the important subjects to
be investigated. Illiadis et al. suggested that the 25Al(p,gamma)26Si reaction is
dominated by the 3+ unnatural parity state under explosive Hydrogen burning
conditions. Recent studies of 28Si(p,t)26Si, 24Si(3He,ngamma)26Si, and
29Si(3He,6He)26Si reduced the uncertainties in the 26Si levels above the proton
threshold and identified new states as a candidate for the unnatural parity state.
However, for the candidate, they could not make any spin assignment directly using
the angular distribution measurement. In this work, the astrophysically important
26Si states were studied via the 28Si(4He,6He)26Si reaction which can excite
unnatural parity state directly, which is contradictory to the (p,t) reaction that
can not excite unnatural parity state. We have preformed an angular distribution
measurement using the high resolution QDD spectrograph (PA) at Center for Nuclear
Study (CNS), University of Tokyo. The experimental results and data analysis will be
presented.
Author
Young Kwan KWON
(Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea)
Co-authors
Mr
Akito SAITO
(Center for Nuclear Study, Graduate School of Science, University of Tokyo, Wako Branch at RIKEN, Wako, Saitama 351-0198, Japan)
Prof.
Alan A. CHEN
(Department of Physics and Astronomy, McMaster University, Hamilton ON, L8S 4M1, Canada)
Ms
Aram KIM
(Department of Physics, Ewha Womans University, Seoul 120-750, Republic of Korea)
Prof.
Chun Sik LEE
(Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea)
Mr
Guilherme AMADIO
(Center for Nuclear Study, Graduate School of Science, University of Tokyo, Wako Branch at RIKEN, Wako, Saitama 351-0198, Japan)
Dr
Hidetoshi YAMAGUCHI
(Center for Nuclear Study, Graduate School of Science, University of Tokyo, Wako Branch at RIKEN, Wako, Saitama 351-0198, Japan)
Mr
Hisashi HUJIKAWA
(Center for Nuclear Study, Graduate School of Science, University of Tokyo, Wako Branch at RIKEN, Wako, Saitama 351-0198, Japan)
Mr
Jang Youl KIM
(Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea)
Dr
JianJun HE
(Center for Nuclear Study, Graduate School of Science, University of Tokyo, Wako Branch at RIKEN, Wako, Saitama 351-0198, Japan)
Dr
Ju Hahn LEE
(Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea)
Mr
Jun Young MOON
(Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea)
Prof.
Khiem LE HONG
(Institute of Physics and Electronics, Hanoi, Vietnam)
Mr
Kiyohiko INAFUKU
(Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan)
Dr
Masahiko TANAKA
(The Institute of Particle and Nuclear Study, The High Energy Accelerator Organization (KEK), Tsukuba 305-0801, Japan)
Prof.
Nahohito IWASA
(Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan)
Prof.
Seigo KATO
(Department of Physics, Yamagata University, Yamagata 990-8560, Japan)
Prof.
Shigeru KUBONO
(Center for Nuclear Study, Graduate School of Science, University of Tokyo, Wako Branch at RIKEN, Wako, Saitama 351-0198, Japan)
Mr
Yasuo WAKABAYASHI
(Department of Physics, Kyushu University, Fukuoka 812-8581, Japan)
