# Presentation: 029740

## A Neutrino Project at Diablo Canyon

## Underground Neutrino Detectors and Locations

- Atmospheric    (Super-K)

***at national laboratories***

***in an old mine in Japan***

***in a nickel mine in Canada***

## Sudbury Neutrino Observatory

- • 1,000 t ultrapure heavy water in clean room environment
- • 6800 ft underground
- • 9500 photomultipliers

## KamLAND

**Steel Sphere**

- • 1,000 t of liquid scintillator
- • Flammable and toxic

## Diablo Canyon Site

**Diablo Canyon Site**

## Location

- Diablo Canyon powerplant in San Luis Obispo county

## Diablo Canyon

*From South East*

## Diablo Canyon

## Diablo Canyon Site

***• ******Powerful:*** Two reactors (3.1+3.1 GW Eth) on the California coast
- • ***Overburden:*** Horizontal tunnel could give 800 mwe shielding!
- • ***Infrastructure: ***Roads built for heavy machinery. Controlled access.
- • ***Scientific Collaborations:*** existing collaborations between PG&E and marine scientists, biologists, and geologists with site access.

**Diablo Canyon Site**

**1500 ft**

**600 ft**

## Possible Locations for Near Detector

- • Space constrained by hills and infrastructure
- • Best overburden to the North East of the powerplant

- Distances of near detector: > 0.4 km

## Possible Locations for Near Detector

- • Space constrained by hills and infrastructure
- • Best overburden to the North East of the powerplant

- Distances of near detector: > 0.4 km

## Far Detector

**Possible location**
- Crowbar Canyon
- Parallel to Diablo Canyon
- Existing road access
- Possibility for good overburden
- Tunnels in radial direction from reactor* *

## A Reactor Neutrino Oscillation Experiment with Fixed Detectors or Variable Baseline

**~ 600-800 mwe**

- FAR II: distance 2-2.5 km

- FAR I: distance 1.5-2 km

- NEAR: distance~ 0.5 km

**tunnels**

**~ 400 mwe**

**A Reactor Neutrino Oscillation Experiment with Fixed Detectors or Variable Baseline**

*** **Excavation required*

## Possible Movable Detector for Diablo Canyon

- • Modular, movable liquid scintillator detector
- • active muon veto
- • Vfiducial ~ 80-100 t

## Diablo Canyon Project

**Some Detector Issues**
- 	Excavation required
- 	Hazardous materials
**Some Site Issues**
- 	Environmental impact (statepark and conservation area nearby)
- 	Indian burial grounds on PG&E site
**Status**
- 	Negotiations with PG&E are underway

*What are the issues?  *
*What is unique to Diablo Canyon? *
*What is the process for environmental impact studies?** *

## Slide 16

## Sensitivity and Complementarity of 13 Experiments

**Reactor ********13**** experiment**
- No matter effect
- Correlations are small, no degeneracies
- Independent of solar osc. parameters 12,m212

- Sensitivity to sin2213

- 10-1

- 10-3

- 10-2

*Ref: Huber et al., hep-ph/0303232*

***13** sensitivity of reactor experiments comparable to JHF-SK*

## Reactor Neutrino Measurement of 13 

**Searching for Subdominant Oscillations in ********e**** ******** ************,******
*to measure the  last yet undetermined neutrino mixing angle, ****13*

***13 **oscillation signature*

## 13 and CP Violation

**Neutrino Mixing Matrix**

- atmospheric 
- present

- solar 
- present

- reactor and accelerator 
- future

- 0 experiments
- future

## A 13 Reactor Experiment in the US ? 

**Movable detectors?**

***Does a site like this exist?***

**Site Requirements**
- 1. *A reactor, or multiple-reactor complex*
- 2. *Sites for 2-3 detectors at distances of 1-5 km* from reactor
- 3. *Detector overburden for reduction of cosmic ray background*
- 		• Man-made overburden or
- 		• Underground site  in a mine (good overburden)
- 		• Underground site in tunnels (movable detectors)

- A 13 Reactor Experiment in the US ?