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          Institute: MPI für Kernphysik     Collection: Precision Spectroscopy and Ultracold Ensembles     Display Documents

ID: 395094.0, MPI für Kernphysik / Precision Spectroscopy and Ultracold Ensembles
High-precision mass measurements of nickel, copper, and gallium isotopes and the purported shell closure at N = 40
Authors:Guénot, C.; Audi, G.; Beck, D.; Blaum, K.; Bollen, G.; Delahaye, P.; Herfurth, F.; Kellerbauer, A.; Kluge, H.-J.; Libert, J.; Lunney, D.; Schwarz, S.; Schweikhard, L.; Yazidjian, C.
Date of Publication (YYYY-MM-DD):2007-04-09
Title of Journal:Physical Review C
Journal Abbrev.:Phys. Rev. C
Start Page:1
End Page:12
Sequence Number of Article:044303
Copyright:©2007 The American Physical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:High-precision mass measurements of more than 30 neutron-rich nuclides around the Z = 28 closed proton
shell were performed with the triple-trap mass spectrometer ISOLTRAPat ISOLDE/CERN to address the question
of a possible neutron shell closure at N = 40. The results for 57,60,64−69Ni (Z = 28), 65−74,76Cu (Z = 29), and
63−65,68−78Ga (Z = 31) have a relative uncertainty of the order of 10−8. In particular, the mass of 76Cu was
measured for the first time. We analyze the resulting mass surface for signs of magicity, comparing the behavior
of N = 40 with that of known magic numbers and with midshell behavior. While the classic indications from
the mass surface show no evidence for a shell closure at N = 40, there is evidence for a weak—and very
localized—effect for Z = 28, consistent with findings from nuclear spectroscopy studies.
Classification / Thesaurus:21.10.Dr, 21.60.Cs, 27.50.+e, 32.10.Bi
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:vogt
Affiliations:MPI für Kernphysik/Independent Research Groups/Precision experiments with stored ions and antimatter(A. Kellerbauer)
External Affiliations:CSNSM-IN2P3-CNRS, F-91405 Orsay-Campus, France
GSI, Planckstraße 1, D-64291 Darmstadt, Germany
Johannes Gutenberg-Universit¨at, Institut f¨ur Physik, D-55099 Mainz, Germany
NSCL, Michigan State University, East Lansing, Michigan 48824, USA
CERN, Physics Department, CH-1211 Gen`eve 23, Switzerland
Physikalisches Institut, Universit¨at Heidelberg, D-69120 Heidelberg, Germany
Institut de Physique Nucl´eaire, IN2P3-CNRS, F-91406 Orsay-Campus, France
Institut für Physik, Ernst-Moritz-Arndt-Universit¨at, D-17487 Greifswald, Germany
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