Development of α-ToF detector for correlation measurement of atomic masses and decay properties

Bulletin of the American Physical Society

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5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan

Volume 63, Number 12

Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii

Session LH: Instrumentation IV

9:00 AM–11:45 AM, Saturday, October 27, 2018
Hilton Room: Kona 2/3

Chair: Michael Carpenter, Argonne National Laboratory

Abstract ID: BAPS.2018.HAW.LH.4

Abstract: LH.00004 : Development of α-ToF detector for correlation measurement of atomic masses and decay properties

9:45 AM–10:00 AM

Abstract

Presenter:

T. Niwase
(RIKEN)

Authors:

T. Niwase
(RIKEN)

M. Wada
(KEK)

P. Schury
(KEK)

Y. Ito
(JAEA)

D. Kaji
(RIKEN)

M. Rosenbusch
(RIKEN)

S. Kimura
(RIKEN)

K. Morimoto
(RIKEN)

H. Haba
(RIKEN)

S. Ishizawa
(RIKEN)

K. Morita
(Kyushu Univ.)

H. Miyatake
(KEK)

H. Wollnik
(New Mexico State University)

The atomic mass is a unique quantity for each nucleus. Precise mass measurement allows us to identify the atomic number as well as the mass number. Recently, we measured the masses of fusion evaporation products provided from GARIS-II + MRTOF system. Next plan is the measurement the masses of superheavy nuclei (SHN) to identify the nuclides, the expected event rate is less than one event per day due to small cross section.

We should accurately distinguish a true event from large background events such as molecular ions. For this purpose, we have developed an α-ToF detector, the time correlation between a time-of-flight signal and α decay signals can discriminate background events. The α-ToF detector is made of a commercial MagneToF detector and a Si PIN diode. When a heavy ion is hit on the MagneToF, secondary electron(SE) are emitted from the Impact plate of MagneToF and the electron are isochronously transported by a magnetic field an amplified by a multiplier to provide a timing signal of the ion. We replaced the impact plate with an SE emission material coated Si PIN diode. We tested the detector by using a 241Am alpha source, from the result of the test, we confirmed that the correlation between the timing signal and the decay energy can be measured using the α-ToF.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.LH.4

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Bulletin of the American Physical Society

5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan

Volume 63, Number 12

Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii

Session LH: Instrumentation IV

Abstract: LH.00004 : Development of α-ToF detector for correlation measurement of atomic masses and decay properties

Presenter:

Authors:

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