151 research outputs found
Coulomb excitation of Ni at safe energies
The value in Ni has been measured using Coulomb
excitation at safe energies. The Ni radioactive beam was
post-accelerated at the ISOLDE facility (CERN) to 2.9 MeV/u. The emitted
rays were detected by the MINIBALL detector array. A kinematic
particle reconstruction was performed in order to increase the measured c.m.
angular range of the excitation cross section. The obtained value of
2.8 10 efm is in good agreement with the value
measured at intermediate energy Coulomb excitation, confirming the low
transition probability.Comment: 4 pages, 5 figure
Coulomb excitation of 73Ga
The B(E2; Ii -> If) values for transitions in 71Ga and 73Ga were deduced from
a Coulomb excitation experiment at the safe energy of 2.95 MeV/nucleon using
post-accelerated beams of 71,73Ga at the REX-ISOLDE on-line isotope mass
separator facility. The emitted gamma rays were detected by the
MINIBALL-detector array and B(E2; Ii->If) values were obtained from the yields
normalized to the known strength of the 2+ -> 0+ transition in the 120Sn
target. The comparison of these new results with the data of less neutron-rich
gallium isotopes shows a shift of the E2 collectivity towards lower excitation
energy when adding neutrons beyond N = 40. This supports conclusions from
previous studies of the gallium isotopes which indicated a structural change in
this isotopical chain between N = 40 and N = 42. Combined with recent
measurements from collinear laser spectroscopy showing a 1/2- spin and parity
for the ground state, the extracted results revealed evidence for a 1/2-; 3/2-
doublet near the ground state in 73 31Ga42 differing by at most 0.8 keV in
energy
Triaxial Deformation and Nuclear Shape Transition in \u3csup\u3e192\u3c/sup\u3eAu
Background: Nuclei in the Aâ190 mass region show gradual shape changes from prolate through nonaxial deformed shapes and ultimately towards spherical shapes as the Pb region is approached. Exploring how this shape evolution occurs will help us understand the evolution of collectivity in this region.
Purpose: The level scheme of the 192Au nucleus in A â 190 region was studied in order to deduce its deformations.
Methods: High-spin states of 192Au have been populated in the 186W(11B, 5n) reaction at a beam energy of 68 MeV and their Îł decay was studied using the YRAST Ball detector array at the Wright Nuclear Structure Laboratory (WNSL), Yale University.
Results: Based on double and triple Îł-ray coincidence data the level scheme of 192Au has been extended up to IÏ = 32+ at an excitation energy of âŒ6 MeV.
Conclusion: The results are discussed in the framework of pairing and deformation self-consistent total Routhian surface (TRS) and cranked shell model (CSM) calculations. The comparison of the experimental observations with the calculations indicates that this nucleus takes a nonaxial shape similar to other Au nuclei in this region
Experimental studies of proton-neutron mixed symmetry states in the mass A ⌠130 region
Considerable progress has been achieved recently in the experimental investigation of quadrupole-collective isovector excitations in the valence shell, the so called mixed-symmetry states (MSSs), in the mass A â 130 region. This is due to a new experimental technique for study MSSs which is based on the observation of low-multiplicity Îł-ray events from inverse kinematics Coulomb excitation with the large 4Ï spectrometer, such as Gammasphere. The obtained experimental information for the MSSs of stable N 80 isotones indicates that for low-collective vibrational nuclei the underlying single-particle structure can be the most important factor for preserving or fragmenting the MSSs through the mechanism of shell stabilization. The evolution of the MSSs from 134Xe to 138Ce is also used to determine the local strength of the proton-neutron interaction derived for first time from states with symmetric and antisymmetric nature
Restoring the valence-shell stabilization in Nd-140
A projectile Coulomb-excitation experiment was performed at the radioactive-ion beam facility HIE-ISOLDE at CERN to obtain E2 and M1 transition matrix elements of Nd-140 using the multistep Coulomb-excitation code GOSIA. The absolute M1 strengths, B(M1; 2(2)(-) -> 2(1)(+)) = 0.033(8)mu(2)(N), B(M1 ; 2(3)(+) -> 2(1)(+)) = 0.26(-0.10)(+0.11)mu(2)(N), and B(M1; 2(4)+ -> 2(1)(+)) <0.04 mu(2)(N) identify the 2(3)(+) state as the main fragment of the one-quadrupole-phonon proton-neutron mixed-symmetry state of Nd-140. The degree of F-spin mixing in Nd-140 was quantified with the determination of the mixing matrix element VF-mix <7(-7)(-13) keV.Peer reviewe
A study on the transition between seniority-type and collective excitations in 204Po and 206Po
Low-lying yrast states in 204Po and 206Po have been investigated by the Îł-Îł fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the 197Au(11B,4n) and the 198Pt(12C,4n) fusion-evaporation reactions, respectively, at the FN-Tandem Facility at the University of Cologne. The lifetimes of the 4+1 states in both nuclei were measured, along with an upper limit for the 2+1 state in 204Po. The preliminary results are discussed in the scope of the systematic behavior of the transition strengths between yrast states in polonium isotopes
Search formixed-symmetry states of nuclei in the vicinity of the double-magic nucleus 208Pb
In this work we present the results from two experiments dedicated to search for quadrupolecollective isovector valence-shell excitation, the states with so-called mixed proton-neutron symmetry (MSS), in nuclei around the doubly magic nucleus 208Pb. 212Po was studied in an α-transfer reaction. 204Hg was studied in an inverse kinematics Coulomb excitation reaction on a carbon target. Both experiments provide indications for existence of one-phonon MSSs. Those are the first experimentally identified MSSs in the mass A â 208 region
Coulomb Excitation of Proton-rich N = 80 Isotones at HIE-ISOLDE
A projectile Coulomb-excitation experiment was performed at the radioactive ion beam facility HIE-ISOLDE at CERN. The radioactive ÂčâŽâ°Nd and ÂčâŽÂČSm ions were post accelerated to the energy of 4.62 MeV/A and impinged on a 1.45 mg/cmÂČ-thin ÂČâ°âžPb target. The Îł rays depopulating the Coulomb-excited states were recorded by the HPGe-array MINIBALL. The scattered charged particles were detected by a double-sided silicon strip detector in forward direction. Experimental Îł-ray intensities were used for the determination of electromagnetic transition matrix elements. Preliminary results for the reduced transition strength of the B(M1;23+â21+)=0.35(19)ÎŒN2 of ÂčâŽâ°Nd and a first estimation for ÂčâŽÂČSm have been deduced using the Coulomb-excitation calculation software GOSIA. The 2Âłâ states of ÂčâŽâ°Nd and ÂčâŽÂČSm show indications of being the main fragment of the proton-neutron mixed-symmetry 2âșâ,ms state
Lifetime measurements of the low-lying excited states of ÂČâ°âžPo
In this study we present the preliminary results about the lifetimes of the 2ââș, 4ââș states of ÂČâ°âžPo and the upper limit of the lifetime of the 2ââș state. For measuring the lifetimes of the 2ââș and 4ââș states the Recoil Distance Doppler Shift (RDDS) method and for the lifetime of the 2ââș state the Doppler Shift Attenuation method (DSAM) were used. The resulting absolute transition strength B(M1 ; 2ââș â 2ââș) â„ 0.122(20) ÎŒNÂČ reveals the predominant isovector nature of the 2ââș state of ÂČâ°âžPo
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