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Shell structure at N=28 near the dripline: Spectroscopy of Si-42, P-43, and S-44

Fridmann, J, Wiedenhover, I, Gade, A, Baby, LT, Bazin, D, Brown, BA, Campbell, CM, Cook, JM, Cottle, PD, Diffenderfer, E, Dinca, D-C, Glasmacher, T, Hansen, PG, Kemper, KW, Lecouey, JL, Mueller, WF, Rodriguez-Vieitez, E, Terry, JR, Tostevin, JA, Yoneda, K and Zwahlen, H (2006) Shell structure at N=28 near the dripline: Spectroscopy of Si-42, P-43, and S-44 PHYSICAL REVIEW C, 74 (3). ? - ?. ISSN 0556-2813

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Abstract

Measurements of the N=28 isotones Si-42, P-43, and S-44 using one- and two-proton knockout reactions from the radioactive beam nuclei S-44 and Ar-46 are reported. The knockout reaction cross sections for populating Si-42 and P-43 and a 184 keV gamma-ray observed in P-43 establish that the d(3/2) and s(1/2) proton orbits are nearly degenerate in these nuclei and that there is a substantial Z=14 subshell closure separating these two orbits from the d(5/2) orbit. The increase in the inclusive two-proton knockout cross section from Si-42 to S-44 demonstrates the importance of the availability of valence protons for determining the cross section. New calculations of the two-proton knockout reactions that include diffractive effects are presented. In addition, it is proposed that a search for the d(5/2) proton strength in P-43 via a higher statistics one-proton knockout experiment could help determine the size of the Z=14 closure.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Physical Sciences, Physics, Nuclear, Physics, NEUTRON-RICH NUCLEI, INTERMEDIATE ENERGY-RANGE, CROSS-SECTIONS, EXOTIC NUCLEI, ISOTOPES, CLOSURE, LINE, FRAGMENTATION, PHYSICS, REGION
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Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:07
Last Modified: 23 Sep 2013 18:26
URI: http://epubs.surrey.ac.uk/id/eprint/246

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