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

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http://hdl.handle.net/10138/174051

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Olaizola , B , Mach , H , Fraile , L M , Benito , J , Borge , M J G , Boutami , R , Butler , P A , Dlouhy , Z , Fynbo , H O U , Hoff , P , Hyldegaard , S , Jeppesen , H B , Jokinen , A , Jollet , C , Korgul , A , Koster , U , Kroell , T , Kurcewicz , W , Marechal , F , Mrazek , J , 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 2016 , ' High-sensitivity study of levels in Al-30 following beta decay of Mg-30 ' Physical Review C , vol. 94 , no. 5 , 054318 . DOI: 10.1103/PhysRevC.94.054318

Title: High-sensitivity study of levels in Al-30 following beta decay of Mg-30
Author: Olaizola, B.; Mach, H.; Fraile, L. M.; Benito, J.; Borge, M. J. G.; Boutami, R.; Butler, P. A.; Dlouhy, Z.; Fynbo, H. O. U.; Hoff, P.; Hyldegaard, S.; Jeppesen, H. B.; Jokinen, A.; Jollet, C.; Korgul, A.; Koster, U.; Kroell, Th.; Kurcewicz, W.; Marechal, F.; Mrazek, J.; 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.
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2016-11-21
Language: eng
Number of pages: 7
Belongs to series: Physical Review C
ISSN: 2469-9985
URI: http://hdl.handle.net/10138/174051
Abstract: 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.u. is in very good agreement with the USD shell-model prediction of 0.090 W.u. The 1801.5-keV level is the only level observed in this study that could be a candidate for the second excited 2(+) state.
Subject: PICOSECOND LIFETIME MEASUREMENTS
RICH SODIUM ISOTOPES
NUCLEAR-DATA SHEETS
NEUTRON
DESCENDANTS
MOMENTS
REGION
114 Physical sciences
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