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Restoration of the natural E(1/2(1)(+)) - E(3/2(1)(+)) energy splitting in odd -K isotopes towards N=40
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.ORCID iD: 0000-0003-0212-7497
2020 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 802, article id 135215Article in journal (Refereed) Published
Abstract [en]

We report on the first gamma-ray spectroscopy of K-51,K-53 produced via the Ca-52,Ca-54(p,2p) reactions at similar to 250 MeV/nucleon. Unambiguous final-state angular-momentum assignments were achieved for beam intensities down to few particles per second by using a new technique based on reaction vertex tracking combined with a thick liquid-hydrogen target. Through gamma-ray spectroscopy and exclusive parallel momentum distribution analysis, 3/(2)+ ground states and 1/2(+) first excited states in K-51,K-53 were established quantifying the natural ordering of the 1d(3/2) and 2s(1/2) proton-hole states that are restored at N = 32 and 34. State-of-the-art ab initio calculations and shell-model calculations with improved phenomenological effective interactions reproduce the present data and predict consistently the increase of the E(1/4)- E(3/4) energy differences towards N = 40.

Place, publisher, year, edition, pages
ELSEVIER , 2020. Vol. 802, article id 135215
Keywords [en]
Spectroscopy, Shell evolution, K-51, K-53
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-272669DOI: 10.1016/j.physletb.2020.135215ISI: 000515091400059Scopus ID: 2-s2.0-85078626753OAI: oai:DiVA.org:kth-272669DiVA, id: diva2:1429796
Note

QC 20200512

Available from: 2020-05-12 Created: 2020-05-12 Last updated: 2020-05-12Bibliographically approved

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