MASHA separator on the heavy ion beam for determining masses and nuclear physical properties of isotopes of heavy and superheavy elements

Abstract

The MASHA mass spectrometer designed for identifying superheavy elements by their masses is described. The separation efficiency has been measured in the autonomous mode using four calibrated leak ages of noble gases. The total separation efficiency of the mass spectrometer with a hot catcher and an ion source based on the electron cyclotron resonance has been determined using the 40 Ar beam. Test experiments have been carried out, in which α active Hg isotopes produced in complete fusion reaction 40 Ar + 144 Sm -xnHg + xn, have been detected in the focal plane of the mass spectrometer. The separation time and effi ciency have been determined for short lived Hg isotopes.

New isotope Mc286 produced in the Am243+Ca48

“…At this time, there is no clear understanding of origin of the short chains. Apparently, only a direct measurement of the mass number of one of the isotopes in the short chain will dispel doubts, e. g., using the devices presented at [16,33]. As can be seen in Fig.…”

Study of neutron-rich isotopes near N=152 shell closure using Timepix type detectors integrated into the mass separator MASHA

“…The frontal detector part covers a 240×35 mm area of the focal plane and consists of 192 strips with a pitch of 1.25 mm. In the case of radon isotopes a set of peaks (masses) with the step of 15 strips is seen [1][2][3]. When the MASHA + Timepix setup is used in the experiment, one part of multi-strip detector is replaced with Timepix detector, so it is quite easy to set roughly the given mass on Timepix sensor.…”

“…The MASHA facility [1][2][3] was developed as a high precision mass-spectrometer for heavy and super heavy elements with masses up to 450 a.m.u. It uses ISOL (Isotope Separation On-Line) method.…”

A beachhead on the island of stability

“…Those measurements were made at the SHIPTRAP facility at the GSI. 15 Two new instruments, MASHA at the JINR, 16 and FIONA at LBNL, 17 are expected to operate soon.…”