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Mass measurements of As, Se and Br nuclei and their implication on the proton-neutron interaction strength towards the N=Z line | | I. Mardor
; S. Ayet San Andres
; T. Dickel
; D. Amanbayev
; S. Beck
; J. Bergmann
; H. Geissel
; L. Grof
; E. Haettner
; C. Hornung
; N. Kalantar-Nayestanaki
; G. Kripko-Koncz
; I. Miskun
; A. Mollaebrahimi
; W. R. Plass
; C. Scheidenberger
; H. Weick
; S. Bagchi
; D. L. Balabanski
; A. A. Bezbakh
; Z. Brencic
; O. Charviakova
; V. Chudoba
; P. Constantin
; M. Dehghan
; A. S. Fomichev
; L. V. Grigorenko
; O. Hall
; M. N. Harakeh
; J. P. Hucka
; A. Kankainen
; O. Kiselev
; R. Knobel
; D. A. Kostyleva
; S. A. Krupko
; N. Kurkova
; N. Kuzminchuk
; I. Mukha
; I. A. Muzalevskii
; D. Nichita
; C. Nociforo
; Z. Patyk
; M. Pfutzner
; S. Pietri
; S. Purushothaman
; M. P. Reiter
; H. Roesch
; F. Schirru
; P. G. Sharov
; A. Spataru
; G. Stanic
; A. State
; Y. K. Tanaka
; M. Vencelj
; M. I. Yavor
; J. Zhao
; | | Date: |
26 Nov 2020 | | Abstract: | Mass measurements of the $^{69}$As, $^{70,71}$Se and $^{71}$Br isotopes,
produced via fragmentation of a $^{124}$Xe primary beam at the FRS at GSI, have
been performed with the multiple-reflection time-of-flight mass spectrometer
(MR-TOF-MS) of the FRS Ion Catcher with an unprecedented mass resolving power
of almost 1,000,000. For the $^{69}$As isotope, this is the first direct mass
measurement. A mass uncertainty of 22 keV was achieved with only 10 events. For
the $^{70}$Se isotope, a mass uncertainty of 2.6 keV was obtained,
corresponding to a relative accuracy of $delta$m/m = 4.0$ imes 10^{-8}$, with
less than 500 events. The masses of the $^{71}$Se and $^{71}$Br isotopes were
measured with an uncertainty of 23 and 16 keV, respectively. Our results for
the $^{70,71}$Se and $^{71}$Br isotopes agree with the 2016 Atomic Mass
Evaluation, and our result for the $^{69}$As isotope resolves the discrepancy
between previous indirect measurements. We measured also the mass of
$^{14}$N$^{15}$N$^{40}$Ar (A=69) with a relative accuracy of $delta$m/m =
1.7$ imes 10^{-8}$, the highest yet achieved with a MR-TOF-MS. Our results
show that the measured restrengthening of the proton-neutron interaction
($delta$V$_{pn}$) for odd-odd nuclei at the N=Z line above Z=29 (recently
extended to Z=37) is hardly evident at N-Z=2, and not evident at N-Z=4.
Nevertheless, detailed structure of $delta$V$_{pn}$ along the N-Z=2 and N-Z=4
lines, confirmed by our mass measurements, may provide a hint regarding the
ongoing $approx$500 keV discrepancy in the mass value of the $^{70}$Br
isotope, which prevents including it in the world average of ${Ft}$-value for
superallowed 0$^+
ightarrow$ 0$^+$ $eta$ decays. The reported work sets the
stage for mass measurements with the FRS Ion Catcher of nuclei at and beyond
the N=Z line in the same region of the nuclear chart, including the $^{70}$Br
isotope. | | Source: | arXiv, 2011.13288 | | Services: | Forum | Review | PDF | Favorites | |
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