ADOPTED LEVELS for 69Br
Author: C.D. Nesaraja | Citation: Nucl. Data Sheets 207, 1 (2026) | Cutoff date: 1-Apr-2023
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-14120 keV SY | S(n)= 15540 keV SY | S(p)= -640 keV 40 | Q(α)= -1750 keV 90 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 69Kr ε decay (27.9 MS) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0.0 | A | (5/2-) | < 24 ns % p = 100 |
| 146 55 | A | (3/2-) | % p = 100 |
| 3152 47 | A | (5/2-) | % p = 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 3152 | (5/2-) | % p = 100 | T=3/2 The main proton-decay branch is observed to the 854-keV, 2+ level in 68Se. I(p)<10% (2011Ro47) and <6.7% (2014De41) are proposed to the 68Se ground state. |
Dataset prepared by F. Kondev (ANL) and C.d. Nesaraja (ORNL)
2011Ro18: 69Br was produced in the fragmentation of a E=140 MeV/u 78Kr beam incident on a 9Be target at NSCL, MSU. The reaction products were selected by the S800 spectrograph and identified by their energy loss and time of flight. Emitted protons were detected by the High Resolution Array (HIRA) with sixteen ΔE-E telescopes, each configured with a double-sided silicon strip detector and backed by four CsI(Tl) crystals. Measured: Ep, implant-p(t) coin.
1996Pf01: Searched for 69Br in the fragmentation of 78Kr projectile with 75 MeV/u on a 58Ni target. Estimated T1/2 from the absence of 69Br.
1995Bl06: Found no evidence for 69Br in the fragmentation of 78Kr beam at 73 MeV/u on a Ni target. Deduced that 69Br is proton unbound by at least 450 keV to yield a T1/2 less than about 100 ns.
1995He39: Attempt to measure the β+ decay half-life of 69Br in the fragmentation of 78Kr at 70 MeV/u on a natural Ni target was not successful because of low count rate.
1995MoZV: searched for 69Br in the fragmentation of a 75 MeV/u 78Kr beam incident on a 58Ni target. No events that could be attributed to 69Br were observed.
1991Mo10: identified 69Br activity in the fragmentation of 78Kr beam at 65 MeV/u on an enriched 58Ni target. However, the authors state that it is difficult to conclude from such a small number of events whether 69Br has been in fact identified or whether the events are due to background processes.
1990Ro15: searched for the g.s. p decays of 69Br using the 40Ca(32S,p2n) reaction with E(32S)=200 MeV. No p groups that could be assigned to 69Br were observed. If the production cross section of 69Br is of the order of 150 microbarns, then 69Br must have p half-life shorter than 300 μs or longer than 30 ms.
1989Ho19: searched for p radioactivity of 69Br using the 40Ca(32S,p2n) reaction. Found no p radioactivity in the energy range 250-600 keV and a T1/2 range of 10 μs -100 ms and a production cross section lower limit of 1 microbarn.
Others: 1999Ja02, 1997Or04, 1989HoZG, 1989HoZQ, 1978BaYE, 1977JaZT
Q-value: ΔQ(β-)=300, ΔS(n)=260 (syst,2021Wa16)
Q-value: S(2n)=29870 300 (syst), S(2p)=4250 40, Q(εp)=5350 40 (2021Wa16)