Coupling of the proton-hole and neutron-particle states in the neutron-rich 48K isotope

Excited states in the Z=19, N=29 neutron-rich 48K isotope have been studied using deep-inelastic transfer reactions with a thick target at Gammasphere and with a thin target at the PRISMA-CLARA spectrometer. The lowest excited states were located; they involve a proton hole in the s1/2 or d 3/2 orbital coupled to a p3/2 neutron. A new 7.1(5)-ns, 5+ isomer, the analog of the 7/2- isomer in 47K, was identified. Based on the observed γ-decay pattern of the isomer a revised spin-parity assignment of 1- is proposed for the ground state of 48K

Low-lying isomeric states in 80Ga from the β− decay of 80Zn

R. Lic et al. ; 7 pags. ; 4 figs. 2 tabls. ; PACS number(s): 21.10.Tg, 23.20.Lv, 23.40.−s, 27.50.+eA new level scheme of 80Ga has been determined. This nucleus was populated following the β− decay of 80Zn at ISOLDE, CERN. The proposed level scheme is significantly different compared to the previously reported one and contains 26 levels up to 3.4 MeV in excitation energy. The present study establishes that the previously identified 1.9-s β−-decaying 6− isomer is the ground state of 80Ga and the 1.3-s β−-decaying 3− isomer lies at an excitation energy of 22.4 keV. A new isomeric level was identified at 707.8 keV and its half-life was measured to be 18.3(5) ns, allowing the 685.4-keV transition de-exciting this state to be assigned an M2 multipolarity. The newly measured spectroscopic observables are compared with shell-model calculations using the jj44bpn and JUN45 interactions. ©2014 American Physical SocietyThis work was partially supported by the Spanish Ministry of Science and Innovation through Projects No. FPA2010- 17142 and No. CSD-2007-00042 (CPAN Consol´ıder, Ingenio2010), by the Romanian ANCS/IFA Grant No. 6 ISOLDE, by the German BMBF under Grant No. 05P12PKFNE, and by the U.S. Department of Energy, Office of Nuclear Physics, under Grant No. DE-FG02-94ER40834. It was also partly funded by the NuPNET network FATIMA-NuPNET (PRIPIMNUP-2011-1338) and by the European Union Seventh Framework through ENSAR (Contract No. 262010).Peer reviewe

Multinucleon transfer reactions studied with magnetic spectrometers

Multinucleon transfer reactions with $^{40}$Ca beams on closed shell nuclei $^{96}$Zr and $^{208}Pb at energies close to the Coulomb barrier were studied using magnetic spectrometers. The comparison between data and calculations, based on semiclassical models, allowed to identify the different degrees of freedom that influence the evolution of the reaction, like deformation, single, and pair transfer modes

Observation of 54Ni: Cross-Conjugate Symmetry in f7/2 Mirror Energy Differences

Gamma decays from excited states up to J(pi)=6(+) in the N=Z-2 nucleus Ni-54 have been identified for the first time. Level energies are compared with those of the isobars Co-54 and Fe-54 and of the cross-conjugate nuclei of mass A=42. The good but puzzling f(7/2) cross-conjugate symmetry in mirror and triplet energy differences is analyzed. Shell model calculations reproduce the new data but the necessary nuclear charge-dependent phenomenology is not fully explained by modern nucleon-nucleon potentials

Spectroscopy of neutron-rich Co nuclei populated in the 70Zn+ 238U reaction

Neutron-rich Co isotopes from N = 34 to 40 were studied through multinucleon transfer by bombarding a 238U target with a 460 MeV 70Zn beam at LNL. Gamma-recoil coincidences were recorded identifying the ions by a high-acceptance magnetic spectrometer (PRISMA) and detecting the gamma radiation by an array of HPGe clover detectors (CLARA). The results are discussed in comparison with the predictions of large-scale shell-model calculations. \ua9 Published under licence by IOP Publishing Ltd

Coupling of the proton-hole and neutron-particle states in the neutron-rich 48K isotope

Excited states in the Z = 19, N = 29 neutron-rich (48)K isotope have been studied using deep-inelastic transfer reactions with a thick target at Gammasphere and with a thin target at the PRISMA-CLARA spectrometer. The lowest excited states were located; they involve a proton hole in the s(1/2) or d(3/2) orbital coupled to a p(3/2) neutron. A new 7.1(5)-ns, 5(+) isomer, the analog of the 7/2 isomer in (47)K, was identified. Based on the observed gamma-decay pattern of the isomer a revised spin-parity assignment of 1(-) is proposed for the ground state of (48)K