In-beam study of 78Br

doi:10.1016/0375-9474(82)90536-X

Nuclear Physics A

Volume 376, Issue 1, 22 February 1982, Pages 131-148

https://doi.org/10.1016/0375-9474(82)90536-X Get rights and content

Abstract

High-spin states in ⁷⁸Br decaying into the 4⁺ isomer at 180.8 keV were excited via the ⁷⁷Se(α, 2np) and ⁷⁶Ge (⁷Li, 5n) reactions. A sequence of closely lying levels with I ⩽ 8 is found between 227.6 and 467.6 keV. The highest state in this group is populated by a relatively strong 904.1 keV ΔI = 2 transition. These features provide a basis for a comparison with the positive-parity ground-state Coriolis-distorted band of ⁷⁹Kr, in the light of a rotor plus one- and two-quasiparticle descriptions.

Other previously reported low-spin states are also seen weakly with this reaction. Two new isomeric states of 9±1 ns at 337.8 keV and 84±8 ns at 227.6 keV are found. The latter decays into the 4⁺ isomer through a 46.8 keV transition, which lies unresolved from the 46.3 keV line. The existence of this doublet explains an earlier discrepancy.

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Cited by (12)

Nuclear Data Sheets for A = 78
2009, Nuclear Data Sheets
The evaluated spectroscopic data are presented for known nuclides of mass 78 (Ni,Cu,Zn,Ga,Ge,As,Se,Br,Kr,Rb,Sr,Y,Zr). Excited-state data are nonexistent for ⁷⁸Ni, ⁷⁸Cu and ⁷⁸Zr. For ⁷⁸Zr, only the isotopic identification is established without any knowledge of its half-life and decay modes. Only limited excited state data exist for ⁷⁸Y. The radioactive decays of the following isotopes are not considered by the evaluators as well established: ⁷⁸Cu, ^78mRb, ⁷⁸Sr and ⁷⁸Y. High-spin excitations are known for ⁷⁸As, ⁷⁸Se, ⁷⁸Br, ⁷⁸Kr, ⁷⁸Rb and ⁷⁸Sr. Significant amounts of new data have been added since the last NDS publication of A = 78 evaluation more than 18 years ago.
This work supersedes earlier full evaluations of A = 78 published by 1981Si13 and 1975Ru01 and the one published in ‘update’ mode by 1991Ra06.
Nuclear data sheets update for A = 78
1991, Nuclear Data Sheets
The experimental nuclear data for mass 78 have been reviewed superseding the 1981 evaluation by Singh and Viggars (81Si13). Nuclear structure, decay and reaction properties of all the nine isobars (Zn, Ga, Ge, As, Se, Br, Kr, Rb and Sr) of mass 78 are reviewed, and an adopted data set for each nucleus is prepared with proper Jπ arguments for the levels. There is not much new information available for ⁷⁸Zn, ⁷⁸Ga, ⁷⁸Ge, ⁷⁸As and ⁷⁸Br. New data are available on heavy ion reactions for ⁷⁸Se, ⁷⁸Kr, ⁷⁸Rb and ⁷⁸Sr as well as on particle transfer studies for ⁷⁸Ge, ⁷⁸Se and ⁷⁸Kr. There are also new experimental data available in (n, γ) studies for ⁷⁸Se.
The high-spin structure of <sup>100</sup>Rh
1984, Nuclear Physics, Section A
High-spin states of ¹⁰⁰Rh have been populated with the reactions ⁹⁹Ru(α, 2np) and ⁹⁸Mo(⁶Li, 4n) and their γ-decay has been studied with Ge(Li) detectors in singles and coincidence. Angular and time distributions of the γ-rays were also measured. As a result 14 new levels spanning spins up to I = 16 built on the 5⁺, 4.5 min isomer at 107 keV have been established, and a half-life of $T_{12} = 120 ± 5$ nsec has been determined for the 7⁺ state at 111.9 keV. The rotor-plus-two-quasiparticle model has been used to describe the observed level structure. The pn interaction is shown to be of negligible effect. On the other hand, the introduction of a soft core is essential. The application of the VMI model with the parameters extracted from the ⁹⁸Ru core yields a remarkably good agreement. This is the first time that the anomalous VMI root $(I_{0} < 0)$ has been applied to a doubly odd nucleus.
Shape coexistence in the odd-odd <sup>186</sup>Au nucleus
1983, Nuclear Physics, Section A
Low-spin states of ¹⁸⁶Au have been studied from the β⁺/EC decay of ¹⁸⁶Hg using the ISOCELE facility. Precise conversion-electron measurements were performed with a semicircular magnetic spectrograph. The ¹⁸⁶Au level scheme has been established with spin and parity assignments deduced from transition multipolarities and log $ƒt$ values. It shows two separate groups of levels which could be interpreted as due to shape coexistence: prolate deformation for the first low-lying states, and oblate deformation for the 251.5 keV (2⁻) and 363.6 keV (1 ⁺) states.
Evidence for Octupole Correlations in Multiple Chiral Doublet Bands
2016, Physical Review Letters
High-spin states and signature inversion in [Formula Presented]
1996, Physical Review C - Nuclear Physics

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^∗: On leave of absence at SUNY, Stony Brook, Long Island, NY, USA.

^∗∗: Fellow of the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina.

^†: Chercheur CNRS.

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In-beam study of 78Br

Abstract

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

J. of Phys.

J. of Phys.

In-beam study of ⁷⁸Br