Session EH: Mini-symposium on Nuclear Physics in Extreme Astrophysical Conditions I

9:00 AM–12:00 PM, Wednesday, September 21, 2005
Ritz-Carlton Hotel Room: Plantation 1

Sponsoring Units: DNP JPS
Chair: Shigeru Kubono, University of Tokyo

Abstract ID: BAPS.2005.HAW.EH.6

Abstract: EH.00006 : Investigation of proton resonant states in $^{23}$Al and $^{22}$Mg using radioactive beams at CNS

10:30 AM–10:45 AM

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Authors:

  Jianjun He
  Shigeru Kubono
  Takashi Teranishi
  Masahiro Notani
  Hidetada Baba
  Shin'ichiro Michimasa
    (Center for Nuclear Study, University of Tokyo (CNS), Japan)

  Shunji Nishimura
  Mizuki Nishimura
  Yoshiyuki Yanagisawa
    (RIKEN (The Institute of Physical and Chemical Research), Japan)

  Hironori Iwasaki
    (Department of Physics, University of Tokyo, Japan)

  Naho Hokoiwa
  Michiya Kibe
  Yasuyuk Gono
    (Department of Physics, Kyushu University, Japan)

  Jun-Yung Moon
  Ju-Hahn Lee
  Chun-Sik Lee
    (Department of Physics, Chung-Ang University, South Korea)

  Seigo Kato
    (Department of Physics, Yamagata University, Japan)

We have studied the proton resonances in $^{23}$Al and $^{22}$Mg via the resonant scattering of radioactive beams on a thick CH$_{2}$ target. The $^{22}$Mg and $^{21}$Na beams were separated by the {\textbf C}NS {\textbf R}adioactive {\textbf I}on {\textbf B}eam separator (CRIB) with energies of 4.4 AMeV and 4.0 AMeV, respectively. At scattering angles of $\theta _{lab}$= 4\r{ }, 17\r{ } and 23\r{ }, the recoiled particles were measured by three sets of $\Delta $E-E Si telescopes. As for nucleus $^{23}$Al (via $^{22}$Mg+p), several new resonant states were observed. As for nucleus $^{22}$Mg (via $^{21}$Na+p), the previously observed resonant states were confirmed. The states above the alpha threshold were observed, which are related to the $^{18}$Ne($\alpha $, p)$^{21}$Na reaction. The resonant parameters were deduced from an R-matrix code. The nuclear structures and the astrophysical implications are discussed.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2005.HAW.EH.6