Intruder features in the island of inversion : The 33Mg case
Nummela, S., Nowacki, F., Baumann, P., Caurier, E., Cederkäll, J., Courtin, S., Dessagne, P., Jokinen, A., Knipper, A., Scornet, G. L., Lyapin, L. G., Miehé, C., Oinonen, M., Poirier, E., Radivojevic, Z., Ramdhane, M., Trzaska, W., Walter, G., Äystö, J., & Collaboration, I. (2001). Intruder features in the island of inversion : The 33Mg case. Physical Review C, 64(5), Article 054313. https://doi.org/10.1103/PhysRevC.64.054313
Published inPhysical Review C
© 2001 American Physical Society
The 33 Na β decay was studied online using mass separation techniques and a first description of the level structure of the neutron-rich isotope 33 Mg , with N = 21 , has been obtained. The experiment involved the measurement of β-γ, β-γ-γ, and β − n − γ coincidences as well as neutron spectra by time-of-flight technique. The first low energy level scheme for the daughter nucleus 33 Mg is given with five bound states. Spin and parity assignments are proposed according to β feedings and γ-ray multipolarities. β-strength distribution is evaluated, taking into account 1 n - and 2 n -emission channels and it is compared with the calculated GT strength distribution. In particular, the 1 p − 1 h and 2 p − 2 h excitations are shown to result in substantial contribution to the low energy configurations. Allowed β branch to the 33 Mg g.s. [ log f t = 5.27 ( 26 ) ] gives direct evidence for the inversion of ν ( f 7 / 2 ) and ν ( d 3 / 2 ) states. ...
PublisherAmerican Physical Society
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