Multiphonon vibrational states in 106,108Pd

Svensson, Lars E. O.; Fahlander, C.; Hasselgren, L.; Bäcklin, A.; Westerberg, L.; Cline, D.; Czosnyka, T.; Wu, C. Y.; Diamond, R. M.; Kluge, H.

doi:10.1016/0375-9474(94)00514-n

Cited by 75 publications

(59 citation statements)

References 38 publications

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“…This is surprising in the light of the high excitation energy (E x 3 MeV) of the 2p-2h states. The presence, in 58 Ni, of one of the weakest ρ 2 (E0) values is easier to understand. The nucleus 58 Ni has two neutrons outside of a doubly-closed shell.…”

Section: A Singly-closed Shell Nucleimentioning

confidence: 99%

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Electric monopole transitions from low energy excitations in nuclei

Wood

Zganjar

Coster³

et al. 1999

Nuclear Physics A

233

223

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Electric monopole (E0) properties are studied across the entire nuclear mass surface. Besides an introductory discussion of various model results (shell model, geometric vibrational and rotational models, algebraic models), we point out that many of the largest E0 transition strengths, ρ 2 (E0), are associated with shape mixing. We discuss in detail the manifestation of E0 transitions and present extensive data for : single-closed shell nuclei, vibrational nuclei, well-deformed nuclei, nuclei that exhibit sudden ground-state changes, and nuclei that exhibit shape coexistence and intruder states. We also give attention to light nuclei, odd-A nuclei, and illustrate a suggested relation between ρ 2 (E0) and isotopic shifts.

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Section: A Singly-closed Shell Nucleimentioning

confidence: 99%

“…The presence, in 58 Ni, of one of the weakest ρ 2 (E0) values is easier to understand. The nucleus 58 Ni has two neutrons outside of a doubly-closed shell. A variety of 0 + pair configurations can arise within the neutron valence shell.…”

Section: A Singly-closed Shell Nucleimentioning

confidence: 99%

Electric monopole transitions from low energy excitations in nuclei

Wood

Zganjar

Coster³

et al. 1999

Nuclear Physics A

233

223

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show abstract

“…Hereby the quadrupole moment of the 2 + state was assumed to be small and the reorientation effect was neglected. The amount of de-excitations in the photo peak of the known 2 + → 0 + transition in 108 Pd [26] was used for normalization, correcting it for 68 Ga-induced excitation. The uncertainty on the count rate in the target deexcitation photo peak contributed only 3% to the total error.…”

Section: +5mentioning

confidence: 99%

Coulomb excitation of2868Ni40at “safe” energies

Bree¹,

Stefanescu²,

Butler

et al. 2008

Phys. Rev. C

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The B(E2; 0 + → 2 + ) value in 68 Ni has been measured using Coulomb excitation at safe energies. The 68 Ni radioactive beam was postaccelerated at the CERN on-line isotope mass separator (ISOLDE) facility to 2.9 MeV/u and directed to a 108 Pd target. The emitted γ rays were detected by the MINIBALL detector array. Not only directly registered but also indirectly deduced information on the nucleus emitting the γ ray was used to perform the Doppler correction, leading to a larger center-of-mass angular range to infer the excitation cross section. orbitals. More recent mass measurements do show a local weak discontinuity in the two-neutron separation energy, thus confirming the very weak N = 40 subshell gap [5]. Still, the 68 Ni nucleus possesses nuclear properties that are characteristic for a doubly magic nucleus: a high 2 + energy and a low B(E2; 0 + → 2 + ) value [6,7,8,9,10]. In recent work it has been advocated that the high 2 + energy is largely due to the opposite parity of the ν2p 3 2 1f 5 2 2p 1 2 orbitals and the νg 9/2 orbital and that a major part of the B(E2) strength resides at high energy [11,12]. Although the high energy of the first 2 + state at 2033 keV has been measured by different experiments [1, 2, 3], the low B(E2; 0 + → 2 + ) value has been obtained from one Coulomb excitation experiment performed in inverse kinematics and using a 68 Ni beam at intermediate energy (produced from the fragmentation of a 70 Zn beam with an energy of 65.9 MeV/u). The value obtained was 255±60 e 2 fm 4 [3], approximately 2 times lower than the B(E2; 0 + → 2 + ) in 56 Ni, with Z = N = 28. As this low B(E2; 0 + → 2 + ) value is crucial for understanding the structure of 68 Ni, a new experiment aimed at measuring this value was performed using a postaccelerated 68 Ni beam from the CERN on-line isotope mass separator (ISOLDE) facility.In this note, we report on a determination of the B(E2; 0 + → 2 + ) value of 68 Ni using safe Coulomb excitation where the contribution of nuclear effects in the excitation process is limited because the separation between the surfaces of the colliding nuclei does not drop below 5 fm over the detected scattering range [13]. The 68 Ni (T 1/2 = 29 s) ion beam was produced at the ISOLDE radioactive-beam facility by bombarding a 1.4-GeV proton beam, produced by the PS booster accelerator, on a UC x target of 52 g/cm 2 . After diffusion of the fission products from the target and transport to the ion source, the nickel atoms were selectively laser ionized [14,15,16] and mass separated, yielding an average beam intensity of approximately 2.5 × 10 6 particles per second at 60 keV [17]. Subsequently, the beam was postaccelerated by up to an energy of 2.9 MeV/u. Coulomb excitation was induced by directing the postaccelerated 68 Ni beam at v/c ∼ 0.08 to a 2 mg/cm 2 108 Pd target. The scattered nuclei were detected by a double sided silicon strip detector (DSSSD) [19], consisting of

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“…Such an approach was taken earlier in Ref. [26]. Figure 1(a) displays the predictions of the pure harmonic quadrupole-phonon vibrator picture.…”

Section: Discussionmentioning

confidence: 97%

gfactors of the low-lying states inPd106: Examination of the vibrational character of
Gürdal
¹
,
Kumbartzki
²
,
Benczer‐Koller
³

et al. 2010
Phys. Rev. C

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The transient field (TF) technique in inverse kinematics was used to measure the g factors of the low lying 2 + 1 , 4 + 1 , and 2 + 2 states in 106 Pd. The g factor of the 4 + 1 state was determined and the g(2 + 1 ) and g(2 + 2 ) factors were remeasured. The values of g(2 + 1 ) and g(2 + 2 ) had been determined earlier in integral perturbed angular correlation (IPAC) experiments and the value of the former served to calibrate the TF. The three g factors, g(2 + 1 ), g(2 + 2 ), and g(4 + 1 ), agree with each other and with the collective Z/A value. The uncertainties in the g(2 + 2 ) and g(4 + 1 ) factors remain fairly large in spite of long measuring times because of the weak excitation of the two-phonon states. The lifetimes of the 2 + 2 and 4 + 1 states were newly determined from line-shape fits.

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Multiphonon vibrational states in 106,108Pd

Cited by 75 publications

References 38 publications

Electric monopole transitions from low energy excitations in nuclei

Electric monopole transitions from low energy excitations in nuclei

Coulomb excitation of2868Ni40at “safe” energies

gfactors of the low-lying states inPd106: Examination of the vibrational character of
Gürdal
¹
,
Kumbartzki
²
,
Benczer‐Koller
³

et al. 2010
Phys. Rev. C

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Multiphonon vibrational states in 106,108Pd

Cited by 75 publications

References 38 publications

Electric monopole transitions from low energy excitations in nuclei

Electric monopole transitions from low energy excitations in nuclei

Coulomb excitation of2868Ni40at “safe” energies

gfactors of the low-lying states inPd106: Examination of the vibrational character ofGürdal1, Kumbartzki2, Benczer‐Koller3 et al. 2010Phys. Rev. C

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Product

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About

gfactors of the low-lying states inPd106: Examination of the vibrational character of
Gürdal
¹
,
Kumbartzki
²
,
Benczer‐Koller
³

et al. 2010
Phys. Rev. C