Isospin symmetry and proton decay: Identification of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>isomer in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ni</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>54</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>
D. RudolphDepartment of Physics, Lund University, S-22100 Lund, SwedenR. HoischenDepartment of Physics, Lund University, S-22100 Lund, SwedenM. HellströmDepartment of Physics, Lund University, S-22100 Lund, SwedenS. PiétriDepartment of Physics, University of Surrey, Guildford, GU2 7XH, United KingdomZs. PodolyákDepartment of Physics, University of Surrey, Guildford, GU2 7XH, United KingdomP. H. ReganDepartment of Physics, University of Surrey, Guildford, GU2 7XH, United KingdomA. B. GarnsworthyDepartment of Physics, University of Surrey, Guildford, GU2 7XH, United KingdomS. J. SteerDepartment of Physics, University of Surrey, Guildford, GU2 7XH, United KingdomF. BeckerGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyP. BednarczykGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyL. CáceresDepartamento de Fisica Teórica, Universidad Autonoma de Madrid, E-28049 Madrid, SpainP. DoornenbalGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyJ. GerlGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyM. GórskaGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyJ. GrȩboszGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyI. KojouharovGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyN. KurzGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyW. ProkopowiczGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyH. SchaffnerGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyH. J. WollersheimGesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyL.-L. AnderssonDepartment of Physics, Lund University, S-22100 Lund, SwedenL. AtanasovaFaculty of Physics, University of Sofia, BG-1164 Sofia, BulgariaD. L. BalabanskiBulgarian Academy of Sciences, BG-1784 Sofia, BulgariaM. A. BentleyDepartment of Physics, University of York, York, YO10 5DD, United Kingdom,A. BlazhevInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyC. BrandauDepartment of Physics, University of Surrey, Guildford, GU2 7XH, United KingdomJ. R. BrownDepartment of Physics, University of York, York, YO10 5DD, United Kingdom,C. FahlanderDepartment of Physics, Lund University, S-22100 Lund, SwedenEmma JohanssonDepartment of Physics, Lund University, S-22100 Lund, SwedenA. JungclausDepartamento de Fisica Teórica, Universidad Autonoma de Madrid, E-28049 Madrid, SpainS. M. LenziDipartimento di Fisica dell'Università and INFN, Sezione di Padova, I-35131 Padova, Italy
2008lv
ABI
Abstract
The \ensuremath{\gamma} decays from an isomeric ${10}^{+}$ state at 6457 keV in the nucleus ${}_{28}^{54}$${\mathrm{Ni}}_{26}$ have been identified using the GSI fragment separator in conjunction with the RISING Ge-detector array. The state is interpreted as the isobaric analog of the 6527-keV ${10}^{+}$ isomer in ${}_{26}^{54}$${\mathrm{Fe}}_{28}$. The results are discussed in terms of isospin-dependent shell-model calculations. Clear evidence is presented for a discrete $\ensuremath{\ell}=5$ proton decay branch into the first excited $9/{2}^{\ensuremath{-}}$ state of the daughter $^{53}\mathrm{Co}$. This decay is the first of its kind observed following projectile fragmentation reactions.
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Cited by 20 references