Precision isochronous mass measurements at the storage ring CSRe in Lanzhou

Tu, X. L.; Wang, M.; Litvinov, Yu. A.; Zhang, Y.H.; Xu, H. S.; Sun, Z. Y.; Audi, G.; Blaum, Klaus; Du, C. M.; Huang, W.; Hu, Zhengguo; Geng, Peng; Jin, S.; Liu, L.X.; Liu, Y.; Mei, B.; Mao, R.S.; Ma, Xueli; Suzuki, Hiroshi; Peng, Shuai; Sun, Y.; Tang, S.W.; Wang, J.S.; Wang, S.T.; Xiao, G. Q.; Xu, Xing; Xia, J.W.; Jiang, Yang; Ye, R.P.; Yamaguchi, Takayuki; Yan, Xiao-Bo; Yuan, Y.J.; Yamaguchi, Yoshitaka; Zang, Yunxiang; Zhao, Hongwei; Zhao, T.C.; Zhang, X.Y.; Zhou, Xianming; Wenlong, Zhan

doi:10.1016/j.nima.2011.07.018

Cited by 87 publications

(35 citation statements)

References 23 publications

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“…Details of the experiment and data analysis can be found in Ref. [30]. In brief, a 467.91 MeV/u 58 Ni 19+ primary beam from the CSRm was focused onto a ∼15 mm thick beryllium target placed in front of the in-flight fragment separator RIBLL2.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Zhang¹

2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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Mass excesses of 52 Co and its (2 + ) isomer are measured to be −34361(8) keV and −33974(10) keV using isochronous mass spectrometry at CSRe. Referring to the β -delayed γ emissions of 52 Ni, we identified a new excited state in 52 Co and assigned it as the T = 2, J π = 0 + isobaric analog state (IAS) of 52 Ni. This state is 135(17) keV less bound than that suggested previously based on the β -delayed protons of 52 Ni. We find that the mass of this IAS together with those of the IAS ′ s in 52 Fe, 52 Mn, and 52 Cr fit well into the Isobaric Multiplet Mass Equation.An interesting finding from this measurement is that the IAS in 52 Co decays dominantly via γ transitions while proton emission is almost negligible. This phenomenon could be due to very low isospin mixing according to the large-scale shell model calculations.

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Section: Experiments and Resultsmentioning

confidence: 99%

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Zhang¹

2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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“…Details of the experiment and data analysis can be found in Ref. [30]. Only a brief outline is given in the following.…”

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confidence: 99%

“…A cocktail beam of 10 ∼ 20 particles per spill were injected into the CSRe. The CSRe was tuned into the isochronous ion-optical mode [30,33] with the transition point at γ t = 1.4. The primary beam energy was selected according to the LISE++ simulations [34] such that the 52 Co 27+ ions had the most probable velocity with γ = γ t at the exit of the target.…”

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confidence: 99%

“…The identification of the peaks was done in the same way as in Ref. [30]. The clearly resolved ground-( 52g Co) and low-lying isomeric-( 52m Co) states of 52 Co are shown in the insert.…”

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confidence: 99%

“…The analysis of data was conducted according to the procedure described in [16,30,36,37]. The measured revolution times of 52 Co and its (2 + ) isomer were fitted using the unbinned maximum likelihood method.…”

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Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
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Masses of 52g,52m Co were measured for the first time with an accuracy of ∼ 10 keV, an unprecedented precision reached for short-lived nuclei in the isochronous mass spectrometry. Combining our results with the previous β -γ measurements of 52 Ni, the T = 2, J π = 0 + isobaric analog state (IAS) in 52 Co was newly assigned, questioning the conventional identification of IASs from the β -delayed proton emissions. Using our energy of the IAS in 52 Co, the masses of the T = 2 multiplet fit well into the Isobaric Multiplet Mass Equation.We find that the IAS in 52 Co decays predominantly via γ transitions while the proton emission is negligibly small. According to our large-scale shell model calculations, this phenomenon has been interpreted to be due to very low isospin mixing in the IAS.PACS numbers: 21.10. Dr, 27.40.+z, 29.20.db The concept of isospin was introduced by Heisenberg [1] and developed by Wigner [2] to describe the charge independence of nuclear forces. This concept is being widely used in particle and nuclear physics [3, 4]. Within the isospin formalism, a nucleus composed of Z protons and N neutrons has a fixed isospin projection of T z = (N − Z)/2, while all states in the nucleus can have different total isospins T ≥ |T z |. In other words, states of a given T can occur in a set of isobaric nuclei with T z = T, T − 1, ..., −T . These states with the same T and J π are called the isobaric analog states (IAS). The states with T = |T z | are the ground states of the corresponding nuclei and the ones with T > |T z | are excited states, except for some oddodd N = Z nuclei [5,6]. A set of IASs with fixed A and T are believed to have very similar structure and properties and to be energetically degenerated in the framework of isospin symmetry. This energy degeneracy is mainly altered due to the Coulomb interaction, the proton-neutron mass difference, and the charge-dependent forces of nuclear origin [7]. In an isobaric multiplet, the masses of the IASs of a given T can be described in first order approximation by the famous quadratic * Corresponding author.

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Exotic Nuclear Beam Facilities

Geißel

Huyse

Münzenberg

et al. 2003

Digital Encyclopedia of Applied Physics

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The knowledge of exotic nuclei properties is essential for the understanding of the strong interaction and the element synthesis in the cosmos. Exotic nuclides are short lived and therefore, cannot be found on Earth but are still produced in stars. To study such atomic nuclei, one has to produce them with nuclear reactions in the laboratory and to separate them with special tools, from all the inevitable abundant background. The production and separation of these exotic nuclear beams can be performed with in‐flight or isotope separation on line facilities or hybrid systems of these two main scenarios. An exotic nuclear beam facility consists mainly of a combination of the production and the separation part as well as a post‐acceleration unit for the case that the experiment needs beams with kinetic energies and emittances different from that what the separator can provide. The challenge to investigate exotic nuclei is that they are characterized by very low production cross sections and short half‐lives. Different reactions to create exotic nuclei, and the physics and techniques of modern separation methods are discussed. We present the recent progress made in studying exotic nuclei by new accelerator developments, powerful separators combined with high‐resolution spectrometers and storage devices, and efficient detector systems. This chapter ends with the description of some recent discoveries with exotic nuclei and the motivation for the next‐generation facilities.

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Precision isochronous mass measurements at the storage ring CSRe in Lanzhou

Cited by 87 publications

References 23 publications

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
Self Cite
38
0
7
0
View full text Add to dashboard Cite

Exotic Nuclear Beam Facilities

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Precision isochronous mass measurements at the storage ring CSRe in Lanzhou

Cited by 87 publications

References 23 publications

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Masses of 52Co And their Impact On The Understanding Of Beta-decay Of 52Ni

Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in Xu1, Zhang2, Peng3 et al. 2016Phys. Rev. Lett.Self Cite38070View full textAdd to dashboardCite

Exotic Nuclear Beam Facilities

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Identification of the Lowest T=2 , Jπ=0+ Isobaric Analog State in
Xu¹,
Zhang²,
Peng³
et al. 2016
Phys. Rev. Lett.
Self Cite
38
0
7
0
View full text Add to dashboard Cite