High-sensitivity study of levels in Al-30 following beta decay of Mg-30

0468238 - ÚJF 2017 RIV US eng J - Journal Article
Olaizola, B. - Mach, H. - Fraile, L. M. - Benito, J. - Borge, M. J. G. - Boutami, R. - Butler, P. A. - Dlouhý, Zdeněk - Fynbo, H. O. U. - Hoff, P. - Hyldegaard, S. - Jeppesen, H. B. - Jokinen, A. - Jollet, C. - Korgul, A. - Koster, U. - Kroll, T. - Kurcewicz, W. - Merechal, F. - Mrázek, Jaromír - Nilsson, T. - Plociennik, W. A. - Ruchowska, E. - Schuber, R. - Schwerdtfeger, W. - Sewtz, M. - Simpson, G. S. - Stanoiu, M. - Tengblad, O. - Thirolf, P. G. - Yordanov, D. T.
High-sensitivity study of levels in Al-30 following beta decay of Mg-30.
Physical Review C. Roč. 94, č. 5 (2016), č. článku 054318. ISSN 2469-9985. E-ISSN 2469-9993
Institutional support: RVO:61389005
Keywords : picosecond lifetime measurements * rich sodium isotopes * nuclear data sheets
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.820, year: 2016

gamma-ray and fast-timing spectroscopy were used to study levels in Al-30 populated following the beta(-) decay of Mg-30. Five new transitions and three new levels were located in Al-30. A search was made to identify the third 1(+) state expected at an excitation energy of similar to 2.5 MeV. Two new levels were found, at 3163.9 and 3362.5 keV, that are firm candidates for this state. Using the advanced time-delayed (ATD) beta gamma gamma (t) method we have measured the lifetime of the 243.8-keV state to be T-1/2 = 15(4) ps, which implies that the 243.8-keV transition is mainly of M1 character. Its fast B(M1; 2(+) -> 3(+)) value of 0.10(3) W is in very good agreement with the USD shell-model prediction of 0.090 W The 1801.5-keV level is the only level observed in this study that could be a candidate for the second excited 2(+) state.
Permanent Link: http://hdl.handle.net/11104/0266079