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In-beam-ray spectroscopy at the proton dripline: 40Sc

Gade, A., Weisshaar, D., Brown, B.A, Tostevin, Jeffrey, Bazin, D., Brown, K., Charity, R.J, Farris, P.J, Hill, M., Li, J. , Longfellow, B., Reviol, W. and Rhodes, D. (2020) In-beam-ray spectroscopy at the proton dripline: 40Sc Physics Letters B, 808, 135637.

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We report on the first in-beam -ray spectroscopy of the proton-dripline nucleus 40Sc using two-nucleon pickup onto an intermediate-energy rare-isotope beam of 38Ca. The 9Be(38Ca,40Sc+)X reaction at 60.9 MeV/nucleon mid-target energy selectively populates states in 40Sc for which the transferred proton and neutron couple to high orbital angular momentum. In turn, due to angular-momentum selection rules in proton emission and the nuclear structure and energetics of 39Ca, such states in 40Sc then exhibit-decay branches although they are well above the proton separation energy. This work uniquely complements results from particle spectroscopy following charge-exchange reactions on 40Ca as well as 40Ti EC/B+ decay which both display very different selectivities. The population and-ray decay of the previously known first (5-) state at 892 keV and the observation of a new level at 2744 keV are discussed in comparison to the mirror nucleus and shell-model calculations. On the experimental side, this work shows that high-resolution in-beam -ray spectroscopy is possible with new generation Ge arrays for reactions induced by rare-isotope beams on the level of a few �b of cross section.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Gade, A.
Weisshaar, D.
Brown, B.A
Bazin, D.
Brown, K.
Charity, R.J
Farris, P.J
Hill, M.
Li, J.
Longfellow, B.
Reviol, W.
Rhodes, D.
Date : 22 September 2020
Funders : U.S. National Science Foundation (NSF), DOE National Nuclear Security Administration, U.S. Department of Energy
DOI : 10.1016/j.physletb.2020.135637
Grant Title : U.S. National Science Foundation (NSF)
Copyright Disclaimer : ©2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (
Additional Information : Embargo OK Metadata OK No Further Action
Depositing User : James Marshall
Date Deposited : 20 Jul 2020 16:21
Last Modified : 28 Jul 2020 08:49

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