Electromagnetic selection rules in the triangular α-cluster model of 12C (English)

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In: Journal of Physics G: Nuclear and Particle Physics   ;  43 ,  8  ;  085104  ;  2016
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After recapitulating the procedure to find the bands and the states occurring in the alpha-cluster model of 12C in which the clusters are placed at the vertexes of an equilateral triangle, we obtain the selection rules for electromagnetic transitions. While the alpha-cluster structure leads to the cancellation of E1 transitions, the approximations carried out in deriving the rotational-vibrational Hamiltonian lead to the disappearance of M1 transitions. Furthermore, although in general the lowest active modes are E2, E3, ... and M2, M3, ..., the cancellation of M2, M3 and M5 transitions between certain bands also occur as a result of the application of group theoretical techniques drawn from molecular physics. These implications can be very relevant for the spectroscopic analysis of γ-ray spectra of 12C.

Table of contents – Volume 43, Issue 8

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084001
Letter of intent for KM3NeT 2.0
S Adrián-Martínez / M Ageron / F Aharonian / S Aiello / A Albert / F Ameli / E Anassontzis / M Andre / G Androulakis / M Anghinolfi et al. | 2016
084002
Shape coexistence at low spin in the Z = 50 region and its spectroscopic signatures
P E Garrett | 2016
085001
Tagging b quarks at extreme energies without tracks
B Todd Huffman / Charles Jackson / Jeff Tseng | 2016
085002
Optical dispersion of composite particles consisting of millicharged constituents
Audrey K Kvam / David C Latimer | 2016
085101
Spin–orbit coupling rule in bound fermion systems
J-P Ebran / E Khan / A Mutschler / D Vretenar | 2016
085102
Fluctuations in charged particle multiplicities in relativistic heavy-ion collisions
Maitreyee Mukherjee / Sumit Basu / Subikash Choudhury / Tapan K Nayak | 2016
085103
Continuum discretised BCS approach for weakly bound nuclei
J A Lay / C E Alonso / L Fortunato / A Vitturi | 2016
085104
Electromagnetic selection rules in the triangular α-cluster model of 12C
G Stellin / L Fortunato / A Vitturi | 2016
085201
Double electron capture searches in 74Se
B Lehnert / T Wester / D Degering / D Sommer / L Wagner / K Zuber | 2016