Publications (5)3.95 Total impact
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Article: The first candidate for chiral nuclei in the $A\sim80$ mass region: $^{80}$Br
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ABSTRACT: Excited states of $^{80}$Br have been investigated via the $^{76}$Ge($^{11}$B, $\alpha$3n) and $^{76}$Ge($^{7}$Li, 3n) reactions and a new $\Delta I$ = 1 band has been identified which resides $\sim$ 400 keV above the yrast band. Based on the experimental results and their comparison with the triaxial particle rotor model calculated ones, a chiral character of the two bands within the $\pi g_{9/2}\otimes \nu g_{9/2}$ configuration is proposed, which provides the first evidence for chirality in the $A\sim80$ region.Physics Letters B 09/2011; 703(1):40-45. · 3.95 Impact Factor -
Article: Electric dipole moments in 230,232U and implications for tetrahedral shapes
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ABSTRACT: The nuclei 230U and 232U were populated in the compound nucleus reactions 232Th(α,6n) and 232Th(α,4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. A comprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of 232U while one E2 transition was also observed for 230U. These allowed B(E1;I-→I+-1)/B(E2;I-→I--2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q2 values for the isotone 226Ra.Phys. Rev. C. 10/2010; 82(4-041305(R) (2010)). -
Article: A double vacuum, configuration dependent pairing and lack of β-vibrations in transitional nuclei: Band structure of N = 88 to N = 91 Nuclei
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ABSTRACT: We have used the AFRODITE γ-ray spectrometer to measure yrare structures in 152,154,155Gd using (α,xn) reactions. The measurements on 152,154Gd have shown that there is no convincing evidence that the lowest excited states are β-vibrations based on the ground state. Rather these levels may be regarded as a “second vacuum” each with its own γ and octupole vibrations. This is confirmed by the blocking of the coupling of this core state in 154Gd to the [505]11/2− single-particle quasi-neutron orbital in 155Gd. The coupling of this orbital to the 2+γ-vibration is observed since this coupling is not Pauli-blocked.Nuclear Physics A. 834:45. -
Article: Stopping power of Nd, Pm and Sm ions in Cd determined with γ-ray lineshape analysis
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ABSTRACT: A semi-thick target has been used to measure the stopping power for recoils, produced in heavy ion induced reactions, by γ-ray lineshape analysis. The target thickness has been chosen such that the recoils are partially slowed down in the target and subsequently escape into vacuum. For transitions deexciting long-lived states the Doppler lineshape then depends only on the stopping power. Stopping-power parameters have been determined for Pm, Sm and Nd nuclei in Cd. The results for the electronic stopping power agree within uncertainties with the predictions of the Lindhard, Scharff and Schiøtt theory. The nuclear stopping power can be well described in the framework of the Ziegler, Biersack and Littmark parameterization using the software package Stopping and Range of Ions in Matter (SRIM)2006.Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. -
Article: Decay of^{6} Be populated in the^{6} Li (^{3} He,^{3} H) charge-exchange reaction
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ABSTRACT: A complete kinematic measurement of the 6Li(3He,3H)αpp reaction is performed at Elab=50 MeV, to investigate the cluster structure of 6Be. The energy and angular distributions of the breakup particles, emitted from the ground and first excited states of 6Be, are compared to three-body resonance and two-body sequential decay calculations. The results indicate a rather pure three-body configuration of the 2+ state of 6Be but they are not conclusive regarding the decay mode of the 0+ state. No branching ratio between sequential and three-body decay paths could be extracted. Excitations above the 2+ state were populated at Ex=1.67–23 MeV. Decay through 5Li-p and 2He-4He channels is identified in the continuum of 6Be, and the reaction mechanism is discussed.Phys. Rev. C. 81(5).
