This recent publication by Akimune et al. (2004) provides experimental confirmation of the Brightsen Nucleon Cluster Model predictions for the isotopes 6He and 6Be. According to the Brightsen NCM, one possible isodyne for 6He is the (t + t ) trinucleon cluster structure [N-P-N] + [N-P-N]. Likewise, the Brightsen model predicts the [P-N-P] + [P-N-P] trinucleon isodyne structure potential for 6Be.
Comments are (welcome).
Trinucleon Cluster Structure at High-Excitation Energies in A = 6 Nuclei
H. Akimune, T. Yamagata, S. Nakayama, M. Fujiwara, K. Fushimi, K. Hara, K. Y. Hara, K. Ichihara, K. Kawase, K. Matsui, K. Nakanishi, A. Shiokawa, M. Tanaka, H. Utsunomiya, and M. Yosoi.
Physics of Atomic Nuclei Vol 67(9) pp. 1721-1725. September 2004
Abstract
Trinucleon molecular structures in 6He and 6Be were investigated by using the 6Li(7Li, 7Be)6He reaction at 455 MeV and 6Li(3He, t)6Be reaction at 450 MeV, respectively. Binary decays into t + t from a broad state at Ex = 18.0 ± 1.0 MeV in 6He and into 3He + 3He from one at Ex = 18.0 ± 1.2 MeV in 6Be, respectively, were observed by measuring trinucleon cluster decays in coincidence with reaction particles. The branching ratios for binary decay were estimated to be about 0.7 for 6He and 6Be. These large branching ratios show that a trinucleon cluster state exists as an isobaric partner around Ex = 18 MeV in 6He and 6Be.©2004 MAIK "Nauka / Interperiodica".
Webmaster updated, posted January 16, 2005. The important linkage of the Brightsen Nucleon Cluster Model with theory of bosons/fermions is demonstrated in the above cluster structure representation for the A=6 isotopes 6He and 6Be. Both of these isotopes are unstable, and the nature of this unstable condition is predicted by the Brightsen NCM when it is realized that 6He is not composed of independent neutrons and protons, but as two identical "fermion" clusters [N-P-N] + [N-P-N]. According to the Pauli Exclusion Principal two identical fermions cannot coexist in the same energy state, thus it is predicted by the Brightsen NCM that 6He would be transformed via negatron beta-decay of one of the [N] within one of the [N-P-N] clusters to a [P] plus antineutrino yielding the stable 6Li, which according to the Brightsen NCM can have an isodyne cluster structure of [N-P-N]+[P-N-P]. Note that this structure does not contain two identical fermions, thus they can coexist without violation of the Pauli Principal. (but see comments below).
Webmaster correction, posted May 14, 2005: The above statement that two [N-P-N] clusters cannot coexist in the same energy level may not be a correct understanding of the Brightsen Model cluster dynamics. In a number of communications, both Mr. Brightsen and Robert Bass have stated that two identical clusters are able to coexist in the same energy level because each "cluster" can have its own spin dynamics, a concept identicle to the concept of "isospin" that is applied to independent nucleons to allow two protons [P]+[P] and [N]+[N] to coexist in separate potential wells in the 1s energy shell level of Mayer and Jensen. Comments are (welcome).
