Nuclear Data Sheets for A = 54

Junde, Huo; Su, Huo

doi:10.1016/j.nds.2006.05.003

Cited by 41 publications

(13 citation statements)

References 270 publications

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“…The measured half-lives are (198 ± 4) ms and (106 ± 20) s, respectively, are in good agreement with the literature values of (193.28 ± 0.07) ms and (88.8 ± 1.2) s [13]. The measurement of the short half-life of the ground state, in particular, shows the potential of the system for future applications.…”

Section: Resultssupporting

confidence: 89%

Online test of the FRS Ion Catcher at GSI

Petrick

Plaß

Behr³

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

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At the FRS Ion Catcher at GSI, relativistic exotic ions produced by projectile fragmentation/fission are range-focused, slowed down and thermalised in a gas-filled stopping cell, extracted and made available to high-precision experiments with ions almost at rest. It is a prototype for a gas cell system at the Low-Energy Branch of the Super-FRS at FAIR. In an online experiment, the FRS Ion Catcher was commissioned successfully with relativistic nickel fragments. The overall efficiency of the system was measured as (1.8 ± 0.3)% and can be divided into a stopping efficiency of (5.0 ± 1.1)% and an extraction and transport efficiency of (35.8 ± 9.4)%. The overall efficiency is hence limited mostly by the stopping efficiency, which could be increased in the future by operating at higher gas cell pressures. From extraction time measurements of polyatomic ions formed in the gas cell extraction times of atomic ions of 20-50 ms can be derived. The potential of the system was illustrated by the half-life measurement of 54 Co with a short half-life of 193 ms only.

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Section: Resultssupporting

confidence: 89%

Online test of the FRS Ion Catcher at GSI

Petrick

Plaß

Behr³

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

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“…Together with the value of B(E2; 2 + → 0 + ) = 14.6(6) W.u. for 54 Cr [25], a considerable reduction of transition strength is observed going from N = 30 to N = 32, which is in line with the increase in E(2 + ). In comparison with the semimagic N = 28 value of B(E2; 2 + → 0 + ) = 11.4(5) W.u.…”

Section: Introductionsupporting

confidence: 77%

Precision lifetime measurements of the first 2+and 4+states in56Cr at the
Seidlitz
¹
,
Reiter
²
,
Dewald
³

et al. 2011
Phys. Rev. C

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Excited states in 56 Cr have been populated after 48 Ca( 11 B,p2n) reactions at a beam energy of 32 MeV. The Cologne plunger device surrounded by a γ -detector array of one EUROBALL cluster detector and five Ge detectors was employed to determine lifetimes with the recoil distance Doppler shift method. γ γ -coincidence data were analyzed using the differential decay curve method and precise lifetimes for the first 2 + and 4 + state of τ = 5.49(14) ps and τ = 3.15(11) ps, respectively, were extracted. The corresponding B(E2; 2 + → 0 + ) = 11.33(31) W.u. quantifies with a high accuracy the puzzling discrepancy between experimental B(E2) values in N = 32 isotones and theoretical results from large-scale shell model calculations employing modern effective nucleon-nucleon interactions.

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“…The existence of an isomeric 10 + state in 54 Fe has been known for decades [13], and thus an isobaric analog state is expected to exist in 54 Ni. Besides basic studies of MED, its observation bears the potential of isospin symmetry studies of electromagnetic moments and decay properties, for example, an independent check on the recently established isoscalar and isovector polarization charges near 56 Ni [14] and a possible extension to E4 transitions.…”

mentioning

confidence: 99%

Isospin symmetry and proton decay: Identification of the10+isomer inNi54

Rudolph¹,

Hoischen²,

Hellström³

et al. 2008

Phys. Rev. C

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The γ decays from an isomeric 10 + state at 6457 keV in the nucleus 54 28 Ni 26 have been identified using the GSI fragment separator in conjunction with the RISING Ge-detector array. A central topic in contemporary nuclear structure physics is the investigation of exotic nuclear matter far from the line of β stability. Long-standing questions are "Where are the proton and neutron drip lines situated?" and "How does the nuclear force depend on varying proton-to-neutron ratios?" [1]. These issues can be addressed by investigating long isotopic chains: The magic Z = 28 nickel chain covers four potentially doublymagic nuclides, namely, with N = 20, N = 28, N = 40, and N = 50. Indeed, 48 Ni is found to denote the proton dripline [2], while measurements on 78 Ni provide crucial information on the astrophysical rapid neutron capture process [3]. As with 68 Ni [4], the self-conjugate N = Z nucleus 56 Ni shows distinct features of a soft doubly-magic core, becoming strongly deformed at modest excitation energies and angular momenta. Furthermore, a rotational state at ∼10 MeV excitation energy in 56 Ni revealed a fast, discrete proton decay branch [5,6]. Another evergreen of nuclear structure studies along the N = Z line is isospin symmetry or, more precisely, the breaking of isospin symmetry due to the Coulomb force as well as, possibly, some components of the strong nucleon-nucleon interaction [7]. Here, the so-called "J = 2 anomaly" must be mentioned: It relates to unusual mirror energy differences (MED) in excited states, the wave functions of which are thought to be dominated by spin J = 2, isospin T = 1 couplings [7][8][9]. During the past decade, the prime region for such investigations has been the rather well-confined N = 3,

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Nuclear Data Sheets for A = 54

Cited by 41 publications

References 270 publications

Online test of the FRS Ion Catcher at GSI

Online test of the FRS Ion Catcher at GSI

Precision lifetime measurements of the first 2+and 4+states in56Cr at the
Seidlitz
¹
,
Reiter
²
,
Dewald
³

et al. 2011
Phys. Rev. C

Isospin symmetry and proton decay: Identification of the10+isomer inNi54

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Nuclear Data Sheets for A = 54

Cited by 41 publications

References 270 publications

Online test of the FRS Ion Catcher at GSI

Online test of the FRS Ion Catcher at GSI

Precision lifetime measurements of the first 2+and 4+states in56Cr at theSeidlitz1, Reiter2, Dewald3 et al. 2011Phys. Rev. C

Isospin symmetry and proton decay: Identification of the10+isomer inNi54

Contact Info

Product

Resources

About

Precision lifetime measurements of the first 2+and 4+states in56Cr at the
Seidlitz
¹
,
Reiter
²
,
Dewald
³

et al. 2011
Phys. Rev. C