Beta decay of nuclides 51Fe and 55Ni: A new approach to on-line isotope separation

Äystö, J.; Ärje, J.; Koponen, V.; Taskinen, P.; Hyvönen, Hanna; Hautojärvi, Α.; Vierinen, K.

doi:10.1016/0370-2693(84)91919-1

Cited by 50 publications

(20 citation statements)

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“…The mass of 55 Ni has been previously measured via 58 Ni( 3 He, 6 He) 55 Ni reactions at the Michigan State University in the 1970s [32,35,36] and via a β-endpoint measurement conducted at IGISOL [37]. The AME03 mass excess value is based on the Q value of Ref.…”

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confidence: 99%

Mass measurements in the vicinity of the doubly magic waiting pointNi56

et al. 2010

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confidence: 99%

Mass measurements in the vicinity of the doubly magic waiting pointNi56

et al. 2010

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“…Those studies included the T Z = −1 beta-delayed proton/alpha emitters 20 Na [1], 24 Al [2], 24 Al m [2], 28 P [3], 32 Cl [3], 36 K [4], 40 Sc [5] as well as the mirror nuclei 49 Mn [6], 53 Co [6], and 59 Zn [7]. After the invention of the new ion-guide method [8], these decay studies were continued at IGISOL and focused on the T Z = −1/2 mirror nuclei 43 Ti [6], 51 Fe [9], and 55 Ni [9].…”

Section: Introductionmentioning

confidence: 99%

“…At IGISOL, beta-decay study of 55 Ni was one of the first experiments performed with the ion-guide method [9]. There, a 27-MeV 3 He beam on enriched 54 Fe target was applied from the old MC-20 cyclotron to produce 55 Ni.…”

Section: Introductionmentioning

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Isomer and decay studies for the rp process at IGISOL

et al. 2012

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This article reviews the decay studies of neutron-deficient nuclei within the mass region A = 56 − 100 performed at the Ion Guide Isotope Separator On-Line (IGISOL) facility in the University of Jyväskylä over last 25 years. Development from He-jet measurements to on-line mass spectrometry, and eventually to atomic mass measurements and post-trap spectroscopy at IGISOL, has yielded studies of around 100 neutron-deficient nuclei over the years. The studies form a solid foundation to astrophysical rp-process path modelling. The focus is on isomers studied either via spectroscopy or via Penning-trap mass measurements. The review is complemented with recent results on the ground and isomeric states of 90 Tc. The excitation energy of the low-spin isomer in 90 Tc has been measured as Ex = 144.1(17) keV with JYFLTRAP double Penning trap and the ground state of 90 Tc has been confirmed to be the (8 + ) state with a half-life of T 1/2 = 49.2(4) s. Finally, the mass-excess results for the spin-gap isomers 53 Co m and 95 Pd m and implications from the JYFLTRAP mass measurements for the (21 + ) isomer in 94 Ag are discussed. PACS. 23.40.-s Beta decay -21.10.-k Properties of nuclei; nuclear energy levels

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“…1(c). The value of f GT ¼ 0:51 AE 0:03 for this transition was established by using the known Fermi [BðFÞ ¼ N À Z ¼ 1] and GT {BðGTÞ ¼ 0:267 [27]} strengths and the ratio R 2 ¼ GT F ¼ 4:0 AE 0:2, which was derived from its well-established beam energy dependence [26]. The values of Fðq; !Þ for the Fermi and GT contributions were determined in the distorted-wave impulse approximation (DWIA; see below) and differed by less than 1%.…”

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Recreating a Stellar Electron Catch

Langanke¹

2011

Physics

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A new technique to measure ðp; nÞ charge-exchange reactions in inverse kinematics at intermediate energies on unstable isotopes was successfully developed and used to study the 56 Niðp; nÞ reaction at 110 MeV=u. Gamow-Teller transition strengths from 56 Ni leading to 56 Cu were obtained and compared with shell-model predictions in the pf shell using the KB3G and GXPF1A interactions. The calculations with the GXPF1A interaction reproduce the experimental strength distribution much better than the calculations that employed the KB3G interaction, indicating deficiencies in the spin-orbit and protonneutron residual potentials for the latter. The results are important for improving the description of electron-capture rates on nuclei in the iron region, which are important for modeling the late evolution of core-collapse and thermonuclear supernovae.Electron capture (EC) and decay on medium-heavy nuclei play important roles in late stellar evolution [1]. In core-collapse (type II) supernovae, these weak reactions strongly affect the evolution towards the explosion [2,3]. EC on 56 Ni is an important contributor to the change in the electron-to-baryon ratio in the core-collapse supernovae of stars of 25-40 solar masses [4]. Accurate EC rates on isotopes in the region near 56 Ni are also critical to better understand the nature of thermonuclear supernovae (type Ia) [5] and help constrain the explosion models [6].Gamow-Teller (GT; ÁL ¼ 0, ÁS ¼ 1, ÁT z ¼ AE1) transition strengths are the key ingredients for calculating EC rates. In this work, we extract the GT strengths from 56 Ni in the ÁT z ¼ À1 ( À ) direction using the 56 Niðp; nÞ reaction at 110 MeV=u in inverse kinematics. Because isospinsymmetry-breaking effects are small, the extracted strengths also describe GT transitions to 56 Co in the ÁT z ¼ þ1 ( þ =EC) direction and directly impact the EC rate estimates for the abovementioned astrophysical processes. More important is that the results provide a deeper insight into the validity of shell-model calculations used to generate strength distributions for many iron-group nuclei for which data are not available.In the independent particle model, 56 Ni with N ¼ Z ¼ 28 is doubly magic. However, since both protons and neutrons occupy the same major (pf) shell, the proton-neutron interaction is relatively strong, thereby softening the f 7=2 core [7,8]. Shell-model calculations with the KB [9,10] and GXPF1 [11,12] families of interactions both predict that the probability of a closed ðf 7=2 Þ 16 shell configuration for 56 Ni is about 65%. However, GT strengths calculated with the KB family of interactions, which have been used in the generation of a weak-reaction rate library for astrophysical calculations [13], differ drastically [14] from those using the GXPF1 family. The differences between the two sets of calculations impact the estimates for EC rates on 56 Ni by as much as 30% [14]. Moreover, by resolving the ambiguity between the two shell-model calculations for the case of 56 Ni, it becomes possible to improve the EC...

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Beta decay of nuclides 51Fe and 55Ni: A new approach to on-line isotope separation

Cited by 50 publications

References 6 publications

Mass measurements in the vicinity of the doubly magic waiting pointNi56

Mass measurements in the vicinity of the doubly magic waiting pointNi56

Isomer and decay studies for the rp process at IGISOL

Recreating a Stellar Electron Catch

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