The 26th Jyväskylä Summer School (JSS26) Jyväskylä, Finland, 11.12.8.2016 0.5cm _Lecturer_: Prof. Mikko Möttönen, University of Jyväskylä, Finland _Assistant_: Ph.D. Juha Jeronen, University of Jyväskylä, Finland

We request to extend the length and modify the contents of our previously approved experiment NP1306-LINAC07. Based on the new availability of ⁵⁰Ti and ⁵⁴Cr beams, and in light of the results of the commissioning portion of NP1306-LINAC07, we believe it is reasonable to extend the campaign to include isotopes of Rf, Db and Sg. We presently have 1.5 days of previously allocated machine time remaining, and wish to request an additional 20 days of machine time to complete the original proposed measurements of Fm, Md, No, and Lr isotopes and an additional 7 days to measure Rf and Db isotopes which can be produced using the new ⁵⁰Ti beam. We are further requesting 7 days of conditional machine time for measurements of Sg when a sufficiently intense ⁵⁴Cr beam becomes available.

In preliminary work towards No and Lr mass measurements (NP1306-LINAC07) we made precision mass measurements of 205, 206Fr and ²⁰¹At and rough mass measurements of ²⁰¹Bi, 201, 205Po, 205, 206At and 205, 206Rn . These measurements were achieved with only 6 hours of machine time, during which the system efficiency was ≈0.5% for ²⁰⁵Fr. 　As shown in Fig. [figIsobars], we have demonstrated an ability to measure multiple isobaric chains simultaneously. This will enable a very efficient survey of the general mass landscape in this region. Here we propose a separate and independent experiment to study this region in detail.