Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction ...

@article{59382,
   author = {Mardor, I. and San Andres, S. Ayet and Dickel, T. and Amanbayev, D. and Beck, S. and Bergmann, J. and Geissel, H. and Grof, L. and Haettner, E. and Hornung, C. and KalantarandNayestanaki, N. and KripkoandKoncz, G. and Miskun, I. and Mollaebrahimi, A. and Plass, W. R. and Scheidenberger, C. and Weick, H. and Bagchi, Soumya and Balabanski, D. L. and Bezbakh, Andrey and Brencic, Z. and Charviakova, O. and Chudoba, Vratislav and Constantin, Paul and Dehghan, M. and Fomichev, A.S. and Grigorenko, L. V. and Hall, O. and Harakeh, M. N. and Hucka, JandP and Kankainen, A. and Kiselev, O. and Knoebel, R. and Kostyleva, D. A. and Krupko, Sergey and Kurkova, N. and Kuzminchuk, N. and Mukha, I. and Muzalevskii, Ivan and Nichita, D. and Nociforo, C. and Patyk, Z. and Pfutzner, M. and Pietri, S. and Purushothaman, S. and Reiter, M. P. and Roesch, H. and Schirru, F. and Sharov, Pavel and Spataru, A. and Stanic, G. and State, A. and Tanaka, Y. K. and Vencelj, M. and Yavor, M., I and Zhao, J.},
   article_number = {3},
   doi = {http://dx.doi.org/10.1103/PhysRevC.103.034319},
   keywords = {CRYOGENIC STOPPING CELL;FRS;PERFORMANCE;PROJECTILE;SEPARATOR;SYMMETRY;SYSTEM;DECAY},
   language = {eng},
   issn = {2469-9985},
   journal = {Physical Review C},
   title = {Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction strength toward the N = Z line},
   url = {https://journals.aps.org/prc/abstract/10.1103/PhysRevC.103.034319},
   volume = {103},
   year = {2021}
}

TY  - JOUR
ID  - 59382
AU  - Mardor, I. - San Andres, S. Ayet - Dickel, T. - Amanbayev, D. - Beck, S. - Bergmann, J. - Geissel, H. - Grof, L. - Haettner, E. - Hornung, C. - Kalantar-Nayestanaki, N. - Kripko-Koncz, G. - Miskun, I. - Mollaebrahimi, A. - Plass, W. R. - Scheidenberger, C. - Weick, H. - Bagchi, Soumya - Balabanski, D. L. - Bezbakh, Andrey - Brencic, Z. - Charviakova, O. - Chudoba, Vratislav - Constantin, Paul - Dehghan, M. - Fomichev, A.S. - Grigorenko, L. V. - Hall, O. - Harakeh, M. N. - Hucka, J-P - Kankainen, A. - Kiselev, O. - Knoebel, R. - Kostyleva, D. A. - Krupko, Sergey - Kurkova, N. - Kuzminchuk, N. - Mukha, I. - Muzalevskii, Ivan - Nichita, D. - Nociforo, C. - Patyk, Z. - Pfutzner, M. - Pietri, S. - Purushothaman, S. - Reiter, M. P. - Roesch, H. - Schirru, F. - Sharov, Pavel - Spataru, A. - Stanic, G. - State, A. - Tanaka, Y. K. - Vencelj, M. - Yavor, M., I - Zhao, J.
PY  - 2021
TI  - Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction strength toward the N = Z line
JF  - Physical Review C
VL  - 103
IS  - 3
SP  - "034319-1"-"034319-10"
EP  - "034319-1"-"034319-10"
SN  - 24699985
KW  - CRYOGENIC STOPPING CELL;FRS;PERFORMANCE;PROJECTILE;SEPARATOR;SYMMETRY;SYSTEM;DECAY
UR  - https://journals.aps.org/prc/abstract/10.1103/PhysRevC.103.034319
N2  - Mass measurements of the nuclides As-69, Se-70,Se-71, and Br-71, produced via fragmentation of a Xe-124 primary beam at the Fragment Separator (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. Such high resolving power is the only way to achieve accurate results and resolve overlapping peaks of short-lived exotic nuclei, whose total number of accumulated events is always limited. For the nuclide As-69, this is the first direct mass measurement. A mass uncertainty of 22 keV was achieved with only ten events. For the nuclide Se-70, a mass uncertainty of 2.6 keV was obtained, corresponding to a relative accuracy of delta m/m = 4.0 x 10(-8), with less than 500 events. The masses of the nuclides Se-71 and Br-71 have been measured with an uncertainty of 23 and 16 keV, respectively. Our results for the nuclides Se-70,Se-71 and Br-71 are in good agreement with the 2016 Atomic Mass Evaluation, and our result for the nuclide As-69 resolves the discrepancy between the previous indirect measurements. We measured also the mass of the molecule N-14 N-15 Ar-40 (A = 69) with a relative accuracy of delta m/m = 1.7 x 10(-8), the highest yet achieved with an MR-TOF-MS. Our results show that the measured restrengthening of the proton-neutron interaction (delta V-pn) for odd-odd nuclei along the N = Z line above Z = 29 (recently extended to Z = 37) is hardly evident at the N - Z = 2 line, and not evident at the N - Z = 4 line. 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 approximate to 500 keV discrepancy in the mass value of the nuclide Br-70, which prevents including it in the world average of Ft value for superallowed 0(+) -> 0(+) beta 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 nuclide Br-70.
ER  - 

MARDOR, I., 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, Soumya BAGCHI, D. L. BALABANSKI, Andrey BEZBAKH, Z. BRENCIC, O. CHARVIAKOVA, Vratislav CHUDOBA, Paul CONSTANTIN, M. DEHGHAN, A.S. FOMICHEV, L. V. GRIGORENKO, O. HALL, M. N. HARAKEH, J-P HUCKA, A. KANKAINEN, O. KISELEV, R. KNOEBEL, D. A. KOSTYLEVA, Sergey KRUPKO, N. KURKOVA, N. KUZMINCHUK, I. MUKHA, Ivan MUZALEVSKII, D. NICHITA, C. NOCIFORO, Z. PATYK, M. PFUTZNER, S. PIETRI, S. PURUSHOTHAMAN, M. P. REITER, H. ROESCH, F. SCHIRRU, Pavel SHAROV, A. SPATARU, G. STANIC, A. STATE, Y. K. TANAKA, M. VENCELJ, M., I YAVOR and J. ZHAO. Mass measurements of As, Se, and Br nuclei, and their implication on the proton-neutron interaction strength toward the N = Z line. \textit{Physical Review C}. 2021, vol.~103, No~3, p.~''034319-1''-''034319-10'', 10 pp. ISSN~2469-9985. Available from: https://dx.doi.org/10.1103/PhysRevC.103.034319.