Nearby SNe with KamLAND Koji Ishidoshiro (Tohoku Univ.) Revealing - PowerPoint PPT Presentation

Nearby SNe with KamLAND Koji Ishidoshiro (Tohoku Univ.) Revealing the history of the universe with underground particle and nuclear research 2019

Betelgeuse (~200pc)

Antares Betelgeuse (~170pc) (~200pc)

Nearby red-supergiant

Next SN candidates

Which firstly detect nearby SN ? Subaru Super-Kamiokande FERMI GW detector

Which firstly detect nearby SN ? Subaru Super-Kamiokande KamLAND FERMI GW detector

SNν 46 PreSNν Odrzywolek (2010) Nakazato (2012) Neutrino luminosity [erg/s] 52 10 50 10 48 10 10 時系列の絵 44 10 -11.6d -2.7h -10s 3s 2s 1s 0 Time PreSN neutrinos

PreSN neutrinos Assumption of SNe at d = 200 pc Flux at the earth KL event spectrum Expected number of events: ~10 (last 48hr) Normal event rate: ~0.1 events/day Theoretical models will be discussed by Yoshida and Odrzywolek.

KamLAND Kam ioka L iquid scintillator A nti- N eutrino D etector (since 2002) - 1,000m depth (Kamioka mine) Inner detector - 1kt liquid scintillator - 1,325 17inch + 554 20inch PMTs Outer detector - 3.2kt cherenkov detector (OD) - 140 20inchPMTs

Inverse-beta decay Anti-neutrino detection: delayed coincidence measurement - time-spatial correlated events - Reduction of background events γ (511 keV) prompt e − e + ¯ p ν e γ (511 keV) n d n p γ (2.2 MeV) delayed

Data Reactor ν + All BG + geo ν Year Event rate 0.9 < Ep < 2.6 MeV - Background rate < 0.1 events/day - Wider range for PreSN ν monitor Even so, background rate < 0.1 events/day

With Odrzywolek model Event spectrum

With Odrzywolek model When we detect ? Detection before collapse is possible.

With Odrzywolek model When we detect ? Detection before collapse is possible.

PreSNv alarm system

Status PreSNv alarm system: running from 2015 Example of users: LIGO, VIRGO, XMASS, SNO+, Borexino, astronomer We are considering the connection to GCN with the private mode.

GWNU Combined studies for SNe: ongoing MoU for Data share:

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By the way

DAQ crush!! KamLAND DAQ: designed for rare-event search Impossible to record all events in nearby SNe Overall updates of DAQ: hard works Updates to avoid crush with on-board SN detection and decimation of the record data. Updates to record all trigger data Developments of new front-end electronics with large on-board memory and high speed readout + improvements of 10 C tagging for 0v2 β search (Takeuchi’s poster) We will install new front-end electronics in the next 5yr.

Other astrophysics with KL - Search for v e related to first three GWs ApJL 829 L34 2016 - Search for v e related to GRBs. ApJ 806 87 2015 Search for v related to GW (NS-NS merger) - Search for SN relic v e Search for charged excitations of dark matter Search for v related to solar flares Kawada’s poster j.astropartphys.2013.12.004

Summary KamLAND:unique detector for nearby SNe at this time PreSN ν monitor: running from 2015 - Strong collaboration with the GW committee - Future possibility: connection to GCN with private mode Proton recoil: reconstruction of SN v x flux R&D of electronics and DAQ: ongoing Studies of other astrophysics: ongoing

さそり座アンタレス(170pc) ペガスス座イプシロン星 (210pc) とも座π(250pc) おおいぬ座シグマ星 (340pc) (340pc)