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ORISS Isomer and Isobar Spectrometer and Separator for Study of Exotic Decays A. Piechaczek for the. UNIRIB Consortium. The purpose is to provide a nuclear research facility at ORNL for consortium members Consortium members:. Our Deliverable is Science – Nuclear Physics

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Oriss isomer and isobar spectrometer and separator for study of exotic decays a piechaczek

ORISS Isomer and Isobar Spectrometer and Separatorfor

StudyofExoticDecays

A. Piechaczek

for the


Unirib consortium
UNIRIB Consortium

  • The purpose is to provide a nuclear research facility at ORNL for consortium members

  • Consortium members:

EMIS 2007


Oriss isomer and isobar spectrometer and separator for study of exotic decays a piechaczek

EMIS 2007


Oriss isomer and isobar spectrometer and separator for study of exotic decays a piechaczek

  • Motivation to build ORISS – Oak Ridge Isomer/Isobar Spectrometer and Separator:

  • Decay studies often possible from yield considerations, but limited by background from isobaric/isomeric contamination

  • Need high resolution separator for background suppression

    ORISS predicted performance:

  • High mass resolving power, M/∆M up to 400,000 (FWHM)

  • Almost complete Suppression of neighboring isobar

  • High efficiency ~ 50%

  • Chemistry independent

  • Transportable

  • Cost effective

  • … use Multi-pass Time of Flight principle!


Oriss isomer and isobar spectrometer and separator for study of exotic decays a piechaczek

Multi-pass Time-of-Flight system: concept Spectrometer and Separator:

MCP detector

or

electrostatic

gate

Pulsed

ion

source

Pulsed

exit electrode

Pulsed

entry electrode

Individual electrodes

1st Electrostatic Mirror

2nd Electrostatic Mirror

MTOFSpectrometer:Spectrum taken with MCP

MTOF Separator: Physical separation using fast electrostatic gate (Bradbury Nielsen gate)

DToF = ½ ToFDM/M

EMIS 2007


Oriss isomer and isobar spectrometer and separator for study of exotic decays a piechaczek

Ge

A=77

Ga

Ge

.160

As

Se

Se

.161

Zn

Zn

.772

T – T0 [microseconds]


Oriss isomer and isobar spectrometer and separator for study of exotic decays a piechaczek

Strawman Spectrometer and Separator: layout of ORISS at UNISOR

RB Ion Source

UNISOR mass separator

“pre-separator”

Beta and

Gamma ray

Detectors

ORISS

RF-cooler and

buncher

Beam diagnostics,

electrostatic

decelerator


Oriss isomer and isobar spectrometer and separator for study of exotic decays a piechaczek

Applications of ORISS Spectrometer and Separator:Decay spectroscopy with pure sources for p-rich and n-richDecay spectroscopy of isomers with sufficient excitationSurvey searches for isomersModular Total Absorption Spectrometer - GT strength functionsFuture: masses/mass differencesFuture: RIB injector


Physics
Physics… Spectrometer and Separator:

Regions around

100Sn

132Sn

78Ni

Regions around 100Sn, 132S, 78Ni


Oriss isomer and isobar spectrometer and separator for study of exotic decays a piechaczek

Physics application: Spectrometer and Separator:

Decay Heat and spectroscopy for advanced nuclear fuel cycle

Many critical measurements can be performed at UNISOR with ORISS

All critical measurements can be performed at UNISOR with ORISS and He-Jet ion source

Elements available with

He-Jet ion source