Magnetic-moment and lifetime measurements of Coulomb-excited levels in 79Br

doi:10.1016/0375-9474(94)90981-4

Nuclear Physics A

Volume 578, Issues 1–2, 3 October 1994, Pages 300-316

https://doi.org/10.1016/0375-9474(94)90981-4 Get rights and content

Abstract

The g-factors of the 217, 523 and 761 keV levels in ⁷⁹Br have been measured using Coulomb excitation of ⁷⁹Br beams and transient field technique with Gd as ferromagnetic host. Lifetimes of several states have been determined using the Doppler-shift attenuation method. Mixing ratios of γ-transitions were deduced from measured angular correlations. The data are discussed in the framework of the weak particle-core coupling and the particle-axial-rotor coupling models.

References (27)

R.L. Robinson et al.
Nucl. Phys. A
(1967)
R.L. Robinson et al.
Nucl. Phys. A
(1972)
R. Sahu et al.
Nucl. Phys. A
(1991)
P. Raghavan
At. Data Nucl. Data Tables
(1989)
K.-H. Speidel et al.
Nucl. Phys. A
(1993)
K.-H. Speidel et al.
Z. Phys. A
(1992)
K.-H. Speidel
Hyp. Int.
(1993)
K.P. Singh et al.
Acta Phys. Pol. B
(1985)
M.N. Seetharamanath et al.
Nuovo Cimento
(1971)
R.C. Chopra
Z. Phys.
(1973)

V.E. Mitroshin et al.

Izv. Akad. Nauk SSSR: Ser. Fiz.

(1982)

K.W.C. Stewart et al.

J. of Phys. A

(1970)

T. Paradellis et al.

Can. J. Phys.

(1971)

Cited by (7)

Nuclear Data Sheets for A = 79
2016, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 79 (Ni,Cu,Zn,Ga,Ge,As,Se,Br,Kr,Rb, Sr,Y,Zr) has been evaluated and presented together with adopted energies, Jπ, and decay modes of levels in these nuclei. No data are yet available for excited states in ⁷⁹Ni, ⁷⁹Cu and ⁷⁹Zr. The half–life of ⁷⁹Se, a nuclide of importance in reactor–irradiated fuel composition has been measured by several independent groups and reported in a number of publications after 1995, and seems to be converging to a narrow margin of experimental values. These measurements were likely prompted by a recommendation made in the 1993 update of A = 79 nuclides (1993Si28), that since a 1949PaZZ report, there had been no measurement until 1993, and that based on simulation studies by 1993HeZW, the value listed in 1949PaZZ, and cited in all data tables and charts for 44 years, was quite likely in error, being too low by a factor of 10. According to conclusions in recent papers such as 2014Do20, there is still room for improvement in the measurement of this half–life, and further experiments are expected. This evaluation supersedes earlier Nuclear Data Sheets for A = 79 (2002Si13,1993Si28, 1982Si21,1975Ur03).
Nuclear data sheets for A = 79
2002, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 79 (Cu,Zn,Ga,Ge,As,Se,Br,Kr,Rb,Sr, Y,Zr) has been evaluated and presented together with adopted energies, Jp, and decay modes of levels in these nuclei. No data are yet available for excited states in 79 Cu, 79 Zn and 79 Zr. In the previous A=79 NDS (1993Si28) it was pointed out in the abstract section that 79 Se radioactivity was of importance in reactor--irradiated fuel composition and that its half--life was not well established. It was reported in only one secondary reference (1949PaZZ), the results of which were later questioned by 1993HeZW in a private communication to the evaluator. Perhaps, motivated by the comment made in 1993Si28, several measurements (mainly from one research group) have since been reported, some using AMS (accelerator mass spectrometry) technique. From the most recent study of 2001Ji04, the half--life of 79 Se isotope now seems as better established, although, results available from different publications are not in good agreement. In the opinion of the evaluator, further confirmatory measurements are still desirable. This evaluation supersedes earlier Nuclear Data Sheets for A=79 (1993Si28, 1982Si21,1975Ur03).
First measurements of the g factors of the 2<inf>1</inf>/+ and 3<inf>1</inf>/-states of semi-magic <inf>40</inf>/90Zr
2000, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
The g factors of the 2⁺₁ and 3⁻₁ states in semi-magic ⁹⁰Zr have been measured for the first time with the technique of Coulomb excitation of ⁹⁰Zr beams in inverse kinematics in combination with transient magnetic fields. The resulting g factors, g(2⁺₁)=+1.25(21) and g(3⁻₁)=+0.986(56), are both consistent with a dominant g_9/2 proton configuration and a closed N=50 neutron shell. The lifetime of the 2⁺₁ state was measured by the Doppler shift attenuation method, τ=0.126(3) ps.
Spin dependence of d<inf>5/2</inf> neutron configurations in the wave functions of 92,94Zr from g-factor measurements
1999, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
g factors of the 2⁺₁ and 4⁺₁ states in ^92,94Zr have been measured via Coulomb excitation of isotopically pure ^92,94Zr beams in inverse kinematics in combination with the transient field technique. The high precision results, g(⁹²Zr; 2⁺₁) = −0.180(10) and g(⁹⁴Zr; 2⁺₁) = −0.329(15) as well as the new data on the 4⁺₁ state, g(⁹²Zr; 4⁺₁) = −0.50(11), provide, for the first time, clear evidence of the dominant role of d_5/2 neutrons in the wave functions of these nuclei just above the N=50 shell closure. Moreover, the data imply increased purity of the d_5/2 neutron component in the wave function with increasing spin.
Spectroscopy of low-lying levels in 81Br and its nuclear-structure interpretation
1996, Nuclear Physics A
Magnetic moments of low-lying levels in ⁸¹Br have been measured using Coulomb excitation of ⁸¹Br beams and the technique of transient magnetic fields with Gd as ferromagnet. In addition, lifetimes have been redetermined for several states employing the Doppler-shift attenuation method and mixing ratios of γ-transitions were deduced from angular correlations. The data are discussed in the framework of the particle-vibrator and the particle-rotor coupling models.
Ft values of the mirror β transitions and the weak-magnetism-induced current in allowed nuclear β decay
2023, Physical Review C

View all citing articles on Scopus

View full text

Article preview

Nuclear Physics A

Abstract

References (27)

Nucl. Phys. A

Nucl. Phys. A

Nucl. Phys. A

At. Data Nucl. Data Tables

Nucl. Phys. A

Z. Phys. A

Hyp. Int.

Acta Phys. Pol. B

Nuovo Cimento

Z. Phys.

Izv. Akad. Nauk SSSR: Ser. Fiz.

J. of Phys. A

Can. J. Phys.

Cited by (7)

Nuclear Data Sheets for A = 79

Nuclear data sheets for A = 79

First measurements of the g factors of the 2<inf>1</inf>/<sup>+</sup> and 3<inf>1</inf>/<sup>-</sup>states of semi-magic <inf>40</inf>/<sup>90</sup>Zr

Spin dependence of d<inf>5/2</inf> neutron configurations in the wave functions of <sup>92,94</sup>Zr from g-factor measurements

Spectroscopy of low-lying levels in <sup>81</sup>Br and its nuclear-structure interpretation

Ft values of the mirror β transitions and the weak-magnetism-induced current in allowed nuclear β decay