Program - Brookhaven National Laboratory

PR 94
Analysis of Three Body Resonances in the Complex Scaled Orthogonal Condition Model
M. Odsuren, Meme Media Laboratory, Hokkaido University Sapporo 060-8628, Japan. M. Odsuren,
Nuclear Research Center, National University of Mongolia, Mongolia. K. Kato, Faculty of Science,
Hokkaido University, Sapporo 060-0810, Japan. M. Aikawa, Faculty of Science, Hokkaido University,
Sapporo 060-0810, Japan.
During the last four decades a resonance problem has emerged as a crucial and useful research area in
nuclear structure. Several extensions of the basic problem have been studied, where, for instance, a unified
treatment of nuclear scattering and structure has been developed. Furthermore, the interactions between
composite particles have extensively been studied, and the role of the Pauli exclusion principle in scattering
and reaction processes has been understood considerably. The complex scaling method (CSM) [1-2] and
the orthogonal condition model (OCM) [3] have been successfully utilized to describe the resonance states
of light and middle mass nuclei. Although many problems have been solved so far, but further researches
are required still. In this study, the complex scaled orthogonal condition model (CSOCM) [4] is applied to
the light nuclei for 9 Be and three-body resonances of α+α+n is investigated. The data on resonance states
of nuclei are of interest to basic and applied research. Although resonance structures of α+α+n have been
studied, experimentally [5-6] and theoretically [7-9], there are still need more accurate and comprehensive
calculations in the structure and decay of the low-lying excited states. The nucleus 9 Be is created in the
universe when cosmic rays induced fission in heavier elements found in interstellar gas and dust. According
to this idea, 9 Be is one of the especial interest system in astrophysics, where formation of 9 Be can proceed
through the reaction 4 He(αn,γ) 9 Be. In addition, the beryllium can be used as a moderator and reflector
for the nuclear facilities, but also it is applicable to isotopic neutron sources, such as plutonium-beryllium
and americium-beryllium source. Due to this interest, the investigation of beryllium isotopic structure is
still important. The main objective of our study is to investigate the resonance states of 9 Be by using
CSOCM for a three-cluster system. Therefore, certainly understanding of α+α and α+n subsystems is
needed in order to perform calculations of an α+α+n system.
[1] Y.K.Ho, Phys. Rep.99, 1(1983) [2] S.Aoyama, T.Myo, K.Kato; and K.Ikeda, Prog. Theor. Phys.116,
1(2006) [3] S.Saito, Prog. Theor. Phys. 40, 893(1968); 41, 705 (1969); Prog. Theor. Phys. Suppl.
62, 11(1977) [4] A.T.Kruppa and K.Kato;, Prog. Theor. Phys. 84, 1145(1990) [5] F.Ajzenberg-Selove,
Nucl. Phys. A490 (1988) [6] T. A. D. Brown et al., Phys. Rev. C76, 054605 (2007). [7] J. Hiura and
I. Shimodaya, Prog. Theor. Phys. 30, 585(1963) [8] H. Furutani, H. Kanada, T. Kaneko, S. Nagata, H.
Nishioka, S. Okabe, S. Saito, T. Sakuda, and M. Seya, Prog. Theor. Phys.Suppl. 68, 193 (1980). [9] K.
Arai, P. Descouvemont, D. Baye, and W. N. Catford, Phys. Rev. C 68, 014310 (2003).
PR 95
B(E2) Evaluation for 0 + 1 → 2+ 1 Transitions in Even-Even Nuclei for Z=2-56
B. Pritychenko, National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973-5000,
USA. M. Birch, Department of Physics & Astronomy, McMaster University, Hamilton, Ontario L8S
4M1, Canada. M. Horoi, Department of Physics, Central Michigan University, Mount Pleasant, MI
48859, USA. B. Singh, Department of Physics & Astronomy, McMaster University, Hamilton, Ontario
L8S 4M1, Canada.
The results of B(E2)↑ evaluation for even-even Z=2-56 nuclei will be presented. This work is a continuation
of S. Raman work [1] on B(E2) values and was motivated by a large number of recent measurements. It
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