Maqola

Lifetime measurements in the transitional nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow/><mml:mn>138</mml:mn></mml:msup></mml:math>Gd

M. G. ProcterSchuster Laboratory, University of Manchester, Manchester, M13 9PL, United KingdomD. M. CullenSchuster Laboratory, University of Manchester, Manchester, M13 9PL, United KingdomP. RuotsalainenDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandT. BraunrothInstitut fr Kernphysik, Universitt zu Kln, D-50937, Kln, GermanyΑ. DewaldInstitut fr Kernphysik, Universitt zu Kln, D-50937, Kln, GermanyC. FransenInstitut fr Kernphysik, Universitt zu Kln, D-50937, Kln, GermanyT. GrahnDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandP. T. GreenleesDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandM. HacksteinInstitut fr Kernphysik, Universitt zu Kln, D-50937, Kln, GermanyK. HauschildDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandU. JakobssonDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandPeter G. JonesDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandR. JulinDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandS. JuutinenDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandS. KetelhutDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandА. Лопез-МартенсDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandM. LeinoDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandJ. LitzingerInstitut fr Kernphysik, Universitt zu Kln, D-50937, Kln, GermanyPaolo MasonDepartment of Physics, University of Surrey, Guildford, GU2 5XH, United KingdomP. NieminenDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandP. PeuraDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandP. RahkilaDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandM. W. ReedDepartment of Physics, University of Surrey, Guildford, GU2 5XH, United KingdomS. RiceDepartment of Physics, University of Surrey, Guildford, GU2 5XH, United KingdomS. Rinta-AntillaDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandW. RotherInstitut fr Kernphysik, Universitt zu Kln, D-50937, Kln, GermanyM. SandzeliusDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandJ. SarénC. ScholeyDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandJ. SorriDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandM. J. TaylorSchuster Laboratory, University of Manchester, Manchester, M13 9PL, United KingdomJ. UusitaloDepartment of Physics, University of Jyvskyl, FIN-40014 Jyvskyl, FinlandA. VitturiPhysics Department and INFN, via Marzolo 8, I-35131 Padova, ItalyYue ShiDepartment of Technical Physics, Peking University, Beijing 100871, ChinaF. R. XuDepartment of Technical Physics, Peking University, Beijing 100871, China

Physical Review Cjournal2011lv

ABI

Annotatsiya

Lifetime measurements have been made in the ground-state band of the transitional nucleus ${}^{138}$Gd from coincidence recoil-distance Doppler-shift data. ${}^{138}$Gd nuclei were produced using the ${}^{106}$Cd (${}^{36}$Ar, 2$p$2$n$) reaction with a beam energy of 190 MeV. Reduced transition probabilities have been extracted from the lifetime data collected with the K\"oln plunger placed at the target position of the JUROGAM-II array. The $B(E2)$ values have been compared with predictions from X(5) critical-point calculations, which describe the phase transition between vibrational and axially symmetric nuclear shapes, as well as with IBM-1 calculations at the critical point. While the excitation energies in ${}^{138}$Gd are consistent with X(5) predictions, the large uncertainties associated with the measured $B(E2)$ values cannot preclude vibrational and rotational contributions to the low-lying structure of ${}^{138}$Gd. Although experimental knowledge for the low-lying $\ensuremath{\gamma}$ and $\ensuremath{\beta}$-vibrational bands in ${}^{138}$Gd is limited, potential-energy surface calculations suggest an increase in $\ensuremath{\gamma}$ softness in the ground-state band. In order to more fully account for the effects of $\ensuremath{\gamma}$ softness, the X(5) and IBM-1 calculations need to be extended to include the $\ensuremath{\gamma}$ degree of freedom for ${}^{138}$Gd.

Mavzular

Nuclear physics research studies Astronomical and nuclear sciences Atomic and Molecular Physics

Identifikatorlar

DOI: 10.1103/physrevc.84.024314

Iqtiboslar va manbalar

0 ta iqtibos37 ta foydalanilgan manba

Koʻrsatkichlar — AkademScholar · Tez orada